JP3370941B2 - Wavelength division type optical communication path - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength division type optical switch function (or optical path cross connect function) for performing cross connect processing of wavelength multiplexed optical path signals in an optical path network, an optical path network and a conventional method. The present invention relates to a wavelength division type optical communication path having an optical path transmission line termination function for converting an optical signal at a contact point with an optical communication network.

[0002]

2. Description of the Related Art The present invention relates to a network node device configuration of an optical path network. First, the optical path network technology will be briefly described. The optical path network is wavelength division multiplexing (W
It is a network based on the DM) technology and the wavelength routing technology, and is characterized in that light is introduced into the path layer. FIG. 13 is an explanatory diagram showing an example of the relationship between the optical path network and the conventional network. The conventional network is, for example, SDH (Sync
hronous Digital Hierachy network, ATM (Asynchronous
Transfer Mode) network, PDH (Plesiochronous Digital)
Hierachy) network or a conventional optical communication network represented by a point-to-point WDM transmission system. In FIG. 13, the conventional communication network is denoted by reference numeral 50-.
1 to 50-4 are attached.

FIG. 13 shows a structure in which a large number of locally introduced conventional networks are connected over a wide range by an optical path network. The optical path network is composed of optical path cross-connect devices (OPXC) 52-1 to 52-4 and optical path transmission line terminators (OLT) 54-1 to 54-4 as network nodes. WDM transmission technology is applied. An optical path is defined between two OLTs, and path switching and editing are performed by OPXC. The optical path transmission line terminators (OLT) 54-1 to 54-4 and the optical path cross connect devices (OPXC) 52-1 to 52-4 are connected to each other to form a plurality of paths.

Optical path cross-connect devices 52-1 to 52-
-4 are connected to each other, so that when there is a transmission line failure, it is possible to switch / reset the path from the working path to the protection path in path units (or wavelength units). For example, in the example shown in FIG. 13, the working path P1 is the optical path cross-connect device 52-1 and the optical path cross-connect device 5.
2-4, but if this transmission line fails, the backup path P2 (transmission line between the optical path cross connect devices 52-1, 52-3, 52-4 Pass)
Is used for communication.

The merit of the optical path is that the capacity of the path can be increased, and a recovery means for a WDM transmission line failure can be provided for each wavelength (Protection / Resto
ration), which basically does not depend on the format of the electric signal that is the client, so that it is possible to easily cope with future changes and evolution of the electric signal transmission format.As a result, depending on the traffic capacity, It is to be able to flexibly construct a network with high failure recovery capability. (For the concept of the optical path network, see K. Sato,
S.Okamoto, and H. Hamada, "Network performance and
integrity enhancement with optical pathlayer techn
ologies ", IEEE JSAC, vol.SAC-12, no.1, pp.159-170,
Details on Jan. 1994.).

The OPXC receives N series optical signals in which M wavelengths are wavelength-multiplexed as signal channels, exchanges the signal channels, and N series in which M wavelengths are wavelength-multiplexed as signal channels, respectively. It has a function of outputting the optical signal of, and can be realized by a wavelength division type optical switch. FIG. 14 is a diagram showing a first configuration example of the OPXC using the wavelength division type optical switch. The OPXC is an N-series input # 1 to #N in which M optical signals are wavelength-multiplexed, and N pre-optical amplifiers 6 that collectively amplify the wavelength-multiplexed signals of each sequence.
0-1 to 60-N, N wavelength separation circuits 62-1 to 62-N for performing wavelength separation, (M × N) input (M × N) output optical switch 64 for switching each signal channel, wavelength N wavelength multiplexing circuits 66-1 to 66- for performing multiplexing
N, post optical amplifiers 68-1 to 68-N, etc. that collectively amplify the output wavelength-multiplexed signals at each output port.

This (M × N) input (M × N) output optical switch circuit requires (M × N) input / output terminals, but various configurations are possible. FIG. 15 is a diagram showing a first specific configuration example of the OPXC by the wavelength division type optical switch shown in FIG. 14, the same parts as those in FIG. 14 are designated by the same reference numerals, and the description thereof will be omitted. . 15 is the same as FIG.
The (M × N) input (M × N) output optical switch 64 is
(M × N) regeneration relay circuits 70-11 to 70-1N,
70-21 to 70-2N, ..., 70-M1 to 70-MN
And M N-input N-output space division type optical switch circuits 72
It is an example configured with -1 to 72-M.

In this example, wavelength separation (M ×
N) input signals are collected for each same wavelength, regenerated and relayed, input to an N × N optical switch, distributed to N series of outputs, and then wavelength-multiplexed. Further, in this configuration, the regenerative repeater circuit 70-11 is provided in the preceding stage of the optical switch.
70-1N, 70-21 to 70-2N, ..., 70-M
1 to 70-MN are provided, which is used when the distance between OPXCs is long or when the OPXCs have a wavelength conversion function (a regenerative repeater circuit is composed of an optical receiver circuit (OR) and an optical transmitter circuit (OS)). Therefore, it is important when the wavelength conversion function is provided in the optical transmission circuit). On the contrary, under some conditions, the regenerative repeater circuit can be omitted.

FIG. 16 is a diagram showing a second concrete configuration example of the OPXC by the wavelength division type optical switch shown in FIG. 14, and the same portions as those of FIG. 14 or 15 are designated by the same reference numerals. , The description is omitted. FIG. 16 shows (M
XN) input (MxN) output optical switch 64 is (MxN)
Regeneration relay circuits 70-11 to 70-1N, 70-21
, 70-2N, ..., 70-M1 to 70-MN, and M N-input / N-output distribution / selection type optical switch circuits 74-1 to 74-
It is an example configured with -M.

FIG. 17 shows an O of a wavelength division type optical switch.
It is a figure which shows the 2nd structural example of PXC, The same code | symbol is attached | subjected to the same part as the 1st structural example shown in FIG. The second configuration example of the OPXC shown in FIG. 17 is an N-series input # 1 to #N in which M optical signals are wavelength-multiplexed, and N pre-optical amplifiers that collectively amplify the wavelength-multiplexed signals of each sequence. 60-1
-60-N, N wavelength separation circuits 62 for performing wavelength separation-
1-62-N, for switching each signal channel (M
XN) input (NxN) output optical switch 76, N optical merging circuits (OC) 78-1 to 78- for performing wavelength multiplexing.
N, post optical amplifiers 68-1 to 68-N, etc. that collectively amplify the output wavelength-multiplexed signals at each output port. Here, (M × N) input (N × N) output optical switch 7
The reason why 6 is an (N × N) output is that an N-output optical switch is arranged for each N-series input, as described in the next example. Further, the reason why the optical merging circuits 78-1 to 78-N are used is to increase the versatility of the wavelength multiplexing unit.

FIG. 18 is a diagram showing a first concrete configuration example of the OPXC by the wavelength division type optical switch shown in FIG. 17, and the same portions as those in FIG. Is omitted. In the OPXC shown in FIG. 18, the (M × N) input (N × N) output optical switch 76 shown in FIG.
(M × N) regeneration relay circuits 70-11 to 70-1M,
70-21 to 70-2M, ..., 70-N1 to 70-NM
And N M-input / N-output distribution / selection type optical switches 80-1.
This is an example configured with 80-N.

This configuration has N series of inputs # 1 to #N in which M optical signals are wavelength-multiplexed, and N pre-optical amplifiers 60-1 to 60-N for collectively amplifying the wavelength-multiplexed signals of each series. , N wavelength demultiplexing circuits 62-1 to 62-N for performing wavelength demultiplexing, and N × M regenerative repeating circuits 70-11 to performing optical signal regeneration.
70-1M, ..., 70-N1 to 70-NM, N number of M input / N output distribution selection type optical switch circuits 80-1 to 80-N for switching each signal channel, N number for performing wavelength multiplexing The optical merging circuits 78-1 to 78-N, post optical amplifiers 68-1 to 68-N for collectively amplifying the output wavelength division multiplexed signal at each output port.

The reason why the N M-input / N-output distribution / selection type optical switches 80-1 to 80-N and the optical merging circuits 78-1 to 78-N are used in this configuration are as follows.
This is because even if the regenerative repeater has a wavelength conversion function, it can be easily accommodated, and the expansion unit can be set for each input / output series, which allows flexible setting and expansion of node capacity according to traffic. . Regarding the types and functions of the switches described so far, for example, see A. Watanab
e, S.Okamoto, and K.Sato, "Optical Path Cross-Conne
ct Node Architecture with High Modularity for Phot
onic Transport Networks ", IEICE Trans.Commun., vol.
See E77-B, No10, pp.1220-1229, Oct. 1994 for details.

By the way, an optical path transmission line terminating device (OL
T) is M × n from the conventional optical communication network (where n <N /
Format conversion of the optical input signal of 2) to the optical path signal,
N wavelength-multiplexed optical signals of n series are output by performing M wavelength multiplexing, or conversely, n wavelength-multiplexed optical path signals are used.
It has a function of wavelength-separating a series of optical input signals, format-converting them into signals of a conventional optical communication network, and outputting them as M × n optical signals.

FIG. 19 shows an optical path transmission line terminating device (OL).
It is a figure which shows one structural example of T). Lower half of the drawing (Fig. 19
The side denoted by the middle code D1) is a portion that receives a signal from the optical path network and passes it to the conventional network side. Inputs # 1 to #n of n-series M-wavelength multiplexed signals and wavelength-multiplexed signals of each series are input. N optical amplifiers 90-1 to 90-n for collectively amplifying, n wavelength demultiplexing circuits 92-1 to 92-n for performing wavelength separation, and n × M number of optical amplifiers for performing signal conversion between an optical path network and a conventional network. Signal converter 93-11
, 93-1M, ..., 93-n1 to 93-nM, and M × n optical output to the conventional network side.

Here, the signal conversion units 93-11 to 93-1
, 93-n1 to 93-nM are optical receiving circuits (O
R), an optical path termination circuit (OPOH), a conventional network termination circuit ( for example, SOH, etc.), and an optical transmission circuit (OS). That is, the optical signal of each wavelength is once converted into an electrical signal,
The optical path is terminated in the electric signal format, and then the conventional network side is also terminated by the electric signal (for example, SDH or ATM), then converted into an optical signal and transmitted to the conventional network side. The half side in the figure (the side labeled D2 in FIG. 19) shows the conversion part in the opposite direction (signal transmission from the conventional network side to the optical path network side). That is, there is M × n optical input from the conventional network side, and n wavelength multiplexing circuits 96-1
.About.96-n and n optical amplifiers 98-1 to 98-n for collectively amplifying the wavelength multiplexed signals of each series.

As described above, in the optical path network, the WDM signal is used as the interface between the nodes, the wavelength routing technology in OPXC is used to edit / change the path, and the optical path network is used in the OLT which is a contact point with the conventional network. A large-capacity and flexible network is provided by using a format conversion function between a signal and a conventional network signal.

[0018]

By the way, in a network node in an optical path network, (i) the interface is made a WDM signal, and (ii) each channel is regenerated and relayed. Versatility
This is an important point when considering operability. In particular, these are indispensable conditions when the nodes are arranged over a long distance between the office buildings, and such a case is assumed for the OPXC connection.

However, the above two points also cause the problems of increasing the amount of hardware of the node and increasing the cost at the same time (for the ratio of these to the amount of hardware of the node, see, for example, H. Ichino, K. Kawai,
S.Okamoto, M.Koga, and K.Sato, "Low-Power small-s
ize Gbit / s interface technologies for robust photo
nic transport network ", GLOBECOM '98, S85.6). OPXC and OLT are assumed to be placed in the same building in actual operation. Also, a device configuration that places importance on cost and device scale may be possible.

The present invention has been made in view of the above circumstances, and when the OPXC function and the OLT function are realized or integrated in the same station building, the problems arising from the above two points are solved to solve the hardware problem. An object of the present invention is to provide a wavelength division type communication path with a small amount of wear (in this case, a device having an OPXC function and an OL function).

[0021]

In order to solve the above-mentioned problems, the present invention is based on the premise that the OPXC function and the OLT function are realized or integrated in the same station building. By the means of connecting by omitting the WDM interface and the regeneration relay circuit originally provided as individual devices, the goal of downsizing and cost reduction of the entire wavelength division type communication channel device is realized. Specifically, the invention according to claim 1 inputs an N-series wavelength-division-multiplexed optical signal in which M wavelengths are wavelength-multiplexed as signal channels, and switching between signal channels is performed to obtain M wavelength signals. An optical switch function unit that outputs N series wavelength-multiplexed optical signals wavelength-multiplexed as channels, and M × n (where n <N
/ 2) The number of optical signals is input, each is converted into an optical path signal, M wavelength-multiplexed signals are output, and n-series wavelength-multiplexed optical signals are output.
An optical path termination function unit that receives a wavelength-division-multiplexed optical signal of a series, performs wavelength separation, converts it into a signal of an optical communication network different from the optical path network, and outputs M × n optical signals. The n-series output of the optical path terminating function section is used as an n-series input of the N-series input of the optical switch function section, and the n-series output of the N-series output of the optical switch function section is used as the optical path termination. A wavelength division type optical communication path for inputting n series of functional units, wherein the wavelength multiplexing unit and the wavelength demultiplexing unit at the connection between the optical path termination functional unit and the optical switch functional unit are omitted, and In addition to connecting with individual optical signals for each wavelength,
Switch function unit receives the input N-n wavelength division multiplexed signal.
N-n waves separated into M signal channels each
N-n separated by the long separation unit and the wavelength separation unit
A series of M signal channels and the optical path termination function
The same for n series of M signal channels output from
Distribute N signals with the same wavelength to N series output destinations
M N input N output space division type optical switches,
A part of the output of the N-input N-output space-division type optical switch
N-n to merge for each series of the output destination N-n-number of wavelength multi
Corresponding to N-n M-wavelength multiplexed signals.
Each optical signal channel is connected to each input of the N−n optical switches.
(N-n) × M regenerative repeater circuits for regenerating
It is characterized by being connected. Further, the invention according to claim 2 is N in which M wavelengths are wavelength-multiplexed as signal channels.
Input the wavelength-division-multiplexed optical signal of the series and input between the signal channels.
By switching the M wavelengths to signal channels
For outputting N-series wavelength-division-multiplexed optical signals
Switch function part and M × n (where n <N / 2) light
Signals are input and converted into optical path signals respectively, and M
When wavelength division multiplexing is performed and an n-series wavelength division multiplexing optical signal is output
Both are n-series wavelength multiplexes in which optical path signals are multiplexed by M wavelengths.
It is different from the optical path network by inputting the heavy optical signal and performing wavelength separation.
Output to M × n optical signals by converting to optical communication network signals
And an optical path terminating function,
Of the N series of the optical switch function section is input to the N series of the optical switch function section.
The n-series input of the power
Of the N series of outputs, n series are output from the optical path termination function unit by n series.
A wavelength division type optical communication path to be used as an input of the
Waves at the connection between the path termination function section and the optical switch function section
Separates each wavelength by omitting the long multiplexer and wavelength demultiplexer
The optical switch function unit is connected with the optical signal of
Input the wavelength-division-multiplexed signals of the N-n series to M
N-n wavelength demultiplexing units for demultiplexing into signal channels
And an N-n series of Ms separated by the wavelength separation unit.
Output from each of the signal channels and the optical path termination function unit.
The same wavelength for M signal channels of n series
The N signals that it has are distributed to N series output destinations.
N-input / N-output distribution / selection type optical switch and the above-mentioned M N-inputs
N-n system for a part of the output of the output switch
N-n wavelength multiplexing units that join each output destination of the column
Equipped with N-n corresponding to N-n M-wavelength multiplexed signals
Regeneration of each optical signal channel to each input of the optical switch of
Process performs the (N-n) × M pieces of regenerative repeating circuit connected
It is characterized by The invention according to claim 3 is M pieces.
N-waves whose wavelengths are wavelength-multiplexed as signal channels
Input a long multiplexed optical signal and switch between signal channels
Each of the M wavelengths is used as a signal channel
Optical switch for outputting multiplexed N-series WDM optical signals
Inputs M × n (where n <N / 2) optical signals to the functional part
Power, each of which is converted into an optical path signal and M wavelength multiplexed
To output an n-series wavelength-division multiplexed optical signal,
N-series wavelength-division-multiplexed optical signal in which optical path signals are multiplexed by M wavelengths
Is input, wavelength separation is performed, and optical communication different from the optical path network is performed.
Light that is converted into a signal of the wire network and outputs M × n optical signals
A path termination function unit, and an n-type optical path termination function unit
The output of the column is the input of N series of the optical switch function unit
Of the N series of the optical switch function unit.
Of the outputs, the n series are input to the n series of the optical path termination function unit.
A wavelength division type optical communication path to be
Wavelength multiplex section of connection section between functional section and optical switch functional section
And the wavelength demultiplexer is omitted, and individual optical signals for each wavelength
And the optical switch function section is
Each of the N-n series wavelength-multiplexed signals that has
N-n wavelength demultiplexing units that are separated into channels, and the wavelengths
M signal channels of N-n sequence separated by the separation unit
Channel and the n-series output from the optical path termination function unit.
For M signal channels, N number of signals having the same wavelength
N M inputs N outputs that distribute signals to N series output destinations
Distribution-selection type optical switch and distribution of N M inputs and N outputs
Part of the output of the selective optical switch is output to the N-n series output destination.
And N−n wavelength multiplexing units that join the
N−n optical switches corresponding to M wavelength multiplexed signals.
Each optical signal channel to each input of the switch
Characterized by connecting (N-n) x M regeneration relay circuits
And In the invention according to claim 4, M wavelengths are transmitted.
N-series wavelength-multiplexed optical signal that is wavelength-multiplexed as a signal channel
Signal as an input, switch between signal channels, and
N wavelength-multiplexed with M wavelengths as signal channels
An optical switch function unit that outputs a series of wavelength-multiplexed optical signals,
Input M × n (where n <N / 2) optical signals,
Each is converted into an optical path signal, M wavelength multiplexing is performed, and n
Outputs a series of wavelength-division multiplexed optical signals, and
Is an M-wavelength multiplexed n-series wavelength-multiplexed optical signal
Then, wavelength separation is performed to receive the signal of the optical communication network different from the optical path network.
Optical path termination that converts to M.n. and outputs Mxn optical signals
And an n-sequence output of the optical path termination function unit.
N series of N series inputs of the optical switch function unit
Of the N-series output of the optical switch function section.
The n-series is the input of the n-series of the optical path termination function unit.
A wavelength division type optical communication path, wherein the optical path termination function unit is
n-series output and corresponding optical switch function unit
The wavelength multiplexer and wavelength demultiplexer at the connection with the input are omitted.
And connect with individual optical signals for each wavelength.
The optical switch functional unit is a wavelength-multiplexer of the input N-n series.
N- for separating each of the multiple signals into M signal channels
separated by n wavelength demultiplexers and the wavelength demultiplexer
N-n sequence M signal channels and the optical path termination
Pairs with n sequence M signal channels output from the function unit
Then, N signals having the same wavelength are output to the N series output destinations.
M number of N input N output space division type optical switches to be distributed
And the output of the M N-input N-output space division type optical switches.
N wavelength multiplexers that combine power for each output destination of N series
And N− corresponding to N−n M-wavelength multiplexed signals.
For each input of the n optical switches,
Connects (N-n) x M regeneration relay circuits that perform regeneration processing
It is characterized by having done. The invention according to claim 5 is
N series in which M wavelengths are wavelength-multiplexed as signal channels
Input of the WDM optical signal of
Then, each of the M wavelengths is transmitted as a signal channel.
An optical switch that outputs a long-multiplexed N-series wavelength-multiplexed optical signal
Switch functional unit and M × n (where n <N / 2) optical signals
Input, convert each to an optical path signal, and obtain M wavelengths
When multiplexing and outputting n-series wavelength-multiplexed optical signals
In addition, the n-series wavelength-division-multiplexed light in which the optical path signals are multiplexed by M
Different from the optical path network by inputting a signal and performing wavelength separation
Convert to optical communication network signals and output M × n optical signals
And an optical path termination function unit that
The n-series output is the N-series input of the optical switch function unit.
Of the n series of inputs, the N series of the optical switch function section
The n series of the output of the column are the n series of the optical path termination function unit.
Is a wavelength division type optical communication path to be input to the optical path.
The n-series output of the termination function unit and the optical switch corresponding thereto
Wavelength division unit and wavelength division of the connection with the input of the switch function unit
If you omit the parts and connect with individual optical signals for each wavelength
In both cases, the optical switch function unit is the input N-n system.
The wavelength-division-multiplexed signal of each row is divided into M signal channels.
The N-n wavelength separation units separated from each other and the wavelength separation unit
Separated N-n sequence M signal channels and
M signal channels of n series output from the optical path termination function unit
For the channel, N series of N signals with the same wavelength are
N input N output distribution selective type light to be distributed to each output destination
A switch and the M N-input / N-output distribution selection type optical switches
N waves that combine the output of the switch for each output destination of the N series
Equipped with a long multiplex part and supports N-n M-wavelength multiplexed signals
To each input of the N-n optical switches.
Performs channel regeneration processing (N-n) x M regeneration relay times
It is characterized by connecting roads. In the invention according to claim 6, M wavelengths are wavelength-multiplexed as signal channels.
Between N-series wavelength-multiplexed optical signals and between signal channels
Of the M wavelengths are changed to signal channels
Output N series wavelength-multiplexed optical signal
Optical switch function unit with M × n (where n <N / 2)
Input optical signal, convert each to optical path signal,
Wavelength-division-multiplexed and output n series of wavelength-division-multiplexed optical signals
And an n-series wave in which the optical path signals are multiplexed by M wavelengths.
Inputs long multiplexed optical signals, performs wavelength separation, and
Converts the signals of different optical communication networks into M × n optical signals
An optical path termination function unit for output,
The output of the n-series of the functional unit is the N-series of the optical switch functional unit.
The n-series input of the
Of the N series outputs of the optical path termination function section
Is a wavelength division type optical communication path for inputting n series of
Output of n series of optical path termination function section and before corresponding
The wavelength multiplexing unit and the connection unit with the input of the optical switch function unit
The wavelength demultiplexer is omitted, and individual optical signals for each wavelength are used for connection.
The optical switch function unit is
Each of the N-n wavelength division multiplexed signals has M signal channels.
N-n wavelength separation units that are separated into channels and the wavelength separation units
N-n sequence of M signal channels separated by sections
And M of n series output from the optical path termination function unit
N signals with the same wavelength for all signal channels
M input N output distribution that allocates N to N series output destinations
Selective optical switch and N M input N output distribution selection
Part of the output of the optical switch is merged for each N series output destination
And N wavelength multiplexing units for N-n M-wave wavelengths
Each input of the N-n optical switches corresponding to multiple signals
Then, the reproduction processing of each optical signal channel is performed (N−n) × M
It is characterized in that a number of regeneration relay circuits are connected.

[0022]

[First Embodiment]

FIG. 1 is a block diagram showing the configuration of a wavelength division type optical communication path according to the first embodiment of the present invention. In summary a wavelength division type optical communication channel according to a first embodiment of the present invention, the M wavelength
Of the N-series signal as an input, switching between the signals, and outputting the N-series signal of M wavelengths as an N-series signal. It has a configuration that can realize an optical path transmission line termination function for interfacing. In the conventional apparatus, it can be considered that the OPXC shown in FIG. 14 and the OLT shown in FIG. 19 are integrated.

Sequence numbers # 1 to # directly connected to the optical path network
The input and output of N-n are wavelength-multiplexed signals, and in order to exchange these signals, the optical amplifiers 2-1 to 2-1 are provided at the input and output ends of the (M × N) input (M × N) output optical switch 6. 2- (N-
n), wavelength demultiplexing circuits 4-1 to 4- (N-n), wavelength multiplexing circuits 8-1 to 8- (N-n), and optical amplifiers 10-1 to 10-1.
10- (N-n) or the like is required. Incidentally, in the first embodiment of the present invention shown in FIG. 1, the wavelength multiplexing unit is realized by the wavelength multiplexing circuits 8-1 to 8- (N-n). Further, the wavelength multiplexing circuit appearing in each of the following embodiments is a concrete implementation of the wavelength multiplexing unit as in the present embodiment. On the other hand, the sequence number # that is the interface with the terminating part #
By connecting the signals before wavelength-multiplexing to N-n + 1 to #N as they are, it is possible to omit the wavelength demultiplexing circuit / wavelength multiplexing circuit, the optical amplifier, and the like.

That is, the optical receiving circuit (OR), the optical path terminating circuit (OPOH), the conventional network terminating circuit (for example, SOH).
Etc.), a signal conversion unit 1 including an optical transmission circuit (OS)
2- (N-n + 1) 1-12- (N-n + 1) M, ...,
The output side of 12-N1 to 12-NM is (M × N) input (M
XN) Output optical switch 6 is directly connected to the input side of the switch, and signal conversion units 14- (N-n + 1) 1 to 14- (N-
The input side of (n + 1) M, ..., 14-N1 to 14-NM and the output side of the (M × N) input (M × N) output optical switch 6 switch are directly connected. According to the above configuration, it is possible to save 4n optical amplifiers, 2n wavelength multiplexing circuits, and 2n wavelength demultiplexing circuits, as compared with a conventional device directly connected. Also, the number of connecting fiber lines will increase,
Since it is in the same building, there is no problem of cost increase and size increase.

FIG. 2 is a diagram showing a modification of the wavelength division type optical communication path according to the first embodiment of the present invention. Compared with the embodiment shown in FIG. 1, in the configuration shown in FIG. 2, the (M × N) input (M × N) output optical switch 6 in FIG.
N) input (N × N) output Instead of the optical switch 16, wavelength multiplexing circuits 8-1 to 8- (N-n) are optical merging circuits (OC).
18-1 to 18- (N-n). In the modified example of the first embodiment of the present invention shown in FIG. 2, the wavelength division multiplexer is provided with the optical merging circuits 18-1 to 18-.
(N−n). Further, the optical merging circuit appearing in each of the following embodiments is a concrete implementation of the wavelength multiplexing unit as in the present embodiment. That is, the phrase "wavelength multiplexing unit" used in this specification has a meaning including a wavelength multiplexing circuit and an optical merging circuit. Therefore, the modified example of the first embodiment of the present invention can be considered as a conventional apparatus in which the OPXC shown in FIG. 17 and the OLT shown in FIG. 19 are integrated. According to the configuration shown in FIG. 2, it is possible to reduce the circuit scale equivalent to that of the configuration shown in FIG.

[Second Embodiment] FIG. 3 is a block diagram showing a configuration of a wavelength division type optical communication path according to a second embodiment of the present invention. This embodiment can be considered as a combination of the OPXC shown in FIG. 14 and the OLT shown in FIG. 19 in a conventional apparatus, but it is (M × N) input (M × N).
N) Of the interface between the output optical switch 6 and the optical path transmission line terminating unit, the portion (sequence number) related to the direction in which a signal flows from the optical path transmission line terminating unit to the (M × N) input (M × N) output optical switch 6. Only # N-n + 1 to #N) are configured so that the wavelength division multiplex transmission is omitted and the wavelength demultiplexing circuit is not provided.

According to the wavelength division type optical communication path having the configuration shown in FIG. 3, it is possible to save 2n optical amplifiers, n wavelength multiplexing circuits, and n wavelength demultiplexing circuits. Furthermore (M × N)
Even in the WDM interface section from the input (M × N) output optical switch 6 to the terminal section, n post optical amplifiers can be omitted under certain conditions.

FIG. 4 is a diagram showing a modification of the wavelength division type optical communication path according to the second embodiment of the present invention. In the configuration shown in FIG. 4, the (M × N) input (M × N) shown in FIG.
N) Output optical switch 6 instead of (M × N) input (N ×
N) Since the output switch 16 is provided, it can be considered that the OPXC shown in FIG. 17 and the OLT shown in FIG. 19 are integrated in the conventional apparatus. According to the configuration shown in FIG. 4, it is possible to reduce the circuit scale equivalent to that of the configuration shown in FIG.

[Third Embodiment] FIG. 5 is a block diagram showing a configuration of a wavelength division type optical communication path according to a third embodiment of the present invention. The wavelength division type optical communication channel according to the third exemplary embodiment of the present invention shown in FIG. 5 is different from the wavelength division type optical communication channel according to the first exemplary embodiment of the present invention shown in FIG.
XN) input (MxN) output optical switch 6 is replaced by M N-input N-output space division type optical switches 30-1 to 30-.
This is the point where M is provided.

In the case of the conventional apparatus, the OPXC shown in FIG.
And the OLT shown in FIG. 19 are integrated, the wavelength multiplexing transmission between them is omitted, and 4n optical amplifiers, 2n wavelength multiplexing circuits, and 2n wavelength demultiplexing circuits are eliminated.
In this figure, N input N output space division type optical switch 30-1
Although the regenerative repeater circuit in the preceding stage of each of .about.30-M is also deleted, such a configuration is also possible depending on the conditions of the transmission line through which the wavelength division multiplexed signal is transmitted. (Embodiments with a regeneration relay circuit are mentioned in the ninth and tenth embodiments.)

[Fourth Embodiment] FIG. 6 is a block diagram showing a configuration of a wavelength division type optical communication path according to a fourth embodiment of the present invention. The wavelength division type optical communication channel according to the fourth exemplary embodiment of the present invention shown in FIG. 6 is different from the wavelength division type optical communication channel according to the second exemplary embodiment of the present invention shown in FIG.
XN) input (MxN) output optical switch 6 is replaced by M N-input N-output space division type optical switches 30-1 to 30-.
This is the point where M is provided.

In the case of the conventional device, the OPXC shown in FIG.
And the OLT shown in FIG. 19 are integrated to omit the wavelength division multiplexing transmission from the optical path termination unit to a part of the N input N output space division type optical switches 30-1 to 30-M in the interface between them. However, 2n optical amplifiers, n wavelength multiplexing circuits, and n wavelength demultiplexing circuits are eliminated. Furthermore, under certain conditions, n post optical amplifiers can be omitted. In FIG. 6, an N input N output space division type optical switch 30 is shown.
Although the regeneration relay circuit in a part of -1 to 30-M is also deleted, such a configuration is also possible depending on the condition of the transmission line through which the wavelength division multiplexed signal is transmitted (the regeneration relay circuit is Certain embodiments are referred to in the ninth and tenth embodiments).

[Fifth Embodiment] FIG. 7 is a block diagram showing a configuration of a wavelength division type optical communication path according to a fifth embodiment of the present invention. The fifth embodiment of the present invention shown in FIG. 7 is different from the first embodiment of the present invention shown in FIG. 1 in that (M × N) input (M × N) output optical switch 6 in FIG. Instead of M
N-input N-output distribution selection type optical switches 34-1 to 34-
-M is provided. In the case of a conventional device, the OPXC shown in FIG. 16 and the OLT shown in FIG. 19 are integrated to omit the wavelength division multiplexing transmission between them, and 4n optical amplifiers, 2n
The number of wavelength multiplexing circuits and the number of wavelength separating circuits of 2n are eliminated. In FIG. 7, the regenerative repeater circuit at a part of the front stage of the N-input / N-output distribution / selection type optical switches 34-1 to 34-M is also deleted, but depending on the condition of the transmission line through which the wavelength division multiplexed signal is transmitted. Such a configuration is also possible (the embodiments with the regeneration relay circuit are referred to in the ninth and tenth embodiments).

[Sixth Embodiment] FIG. 8 is a block diagram showing the structure of a wavelength division type optical communication path according to the sixth embodiment of the present invention. The sixth embodiment of the present invention shown in FIG. 8 is different from the second embodiment of the present invention shown in FIG. 3 in that (M × N) input (M × N) output optical switch 6 in FIG. Instead of M
N-input N-output distribution selection type optical switches 34-1 to 34-
-M is provided. Speaking of the conventional device, OP in FIG.
The XC and the OLT shown in FIG. 19 are integrated to omit the wavelength division multiplexing transmission from the optical path termination unit to a part of the N input N output distribution selection type optical switches 34-1 to 34-M in the interface between them. 2n optical amplifiers, n wavelength multiplexing circuits, and n wavelength demultiplexing circuits are eliminated. Furthermore, under certain conditions, n post optical amplifiers can be omitted.
In FIG. 8, N-input / N-output distribution / selection type optical switches 34-1 to 34-3
Although the regenerative repeater circuit at a part of the front part of 34-M is also deleted, such a configuration is possible depending on the condition of the transmission line through which the wavelength division multiplexed signal is transmitted (the embodiment in which the regenerative repeater circuit is provided. Are mentioned in the ninth and tenth embodiments).

[Seventh Embodiment] FIG. 9 is a block diagram showing the structure of a wavelength division type optical communication path according to the seventh embodiment of the present invention. The seventh embodiment of the present invention shown in FIG. 9 is different from the modification of the first embodiment of the present invention shown in FIG. 2 in that (M × N) input (N × N) output light in FIG. Instead of the switch 16, N M-input / N-output distribution / selection optical switches 36-
1 to 36-N. Fig. 1 shows the conventional device.
The OPXC shown in FIG. 8 and the OLT shown in FIG. 19 are integrated, and an M input N output distribution selection type optical switch 36- (N-
n + 1) to 36-N are related sequences (sequence number # N-n
+1 to #N) is omitted, and 4n optical amplifiers, 2n wavelength multiplexing circuits, and 2n wavelength demultiplexing circuits are eliminated. In FIG. 9, the regenerative repeater circuit in the preceding stage of the M-input / N-output distribution / selection type optical switches 36- (N-n + 1) to 36-N is also deleted, but depending on the condition of the transmission line through which the wavelength division multiplexed signal is transmitted Can also have such a configuration (the ninth and tenth embodiments are provided in the embodiment having a regeneration relay circuit).
Of the embodiments).

[Eighth Embodiment] FIG. 10 shows an eighth embodiment of the present invention.
1 is a block diagram showing a configuration of a wavelength division type optical communication path according to an embodiment. The eighth embodiment of the present invention shown in FIG. 10 is different from the modified example of the second embodiment of the present invention shown in FIG. 4 in that (M × N) input (N × N) output light in FIG. The point is that N switches of M input / N output distribution / selection type optical switches 36-1 to 36-N are provided in place of the switch 16. Speaking of a conventional device, the OPXC shown in FIG. 18 and the OLT shown in FIG. 19 are integrated, and an M-input / N-output distribution selection type optical switch 36- (N-
n + 1) to 36-N wavelength multiplexing transmission is omitted, and
The number of n optical amplifiers, n wavelength multiplexing circuits, and n wavelength demultiplexing circuits is eliminated. Furthermore, under certain conditions, n post optical amplifiers can be omitted. In FIG. 10, M input N output distribution selection type optical switches 36- (N-n + 1) to 3
Although the regeneration relay circuit in the preceding stage of 6-N is also deleted, such a configuration is also possible depending on the condition of the transmission path through which the wavelength division multiplexed signal is transmitted (the embodiment having a regeneration relay circuit is the ninth, Mentioned in the tenth embodiment).

[Ninth Embodiment] FIG. 11 shows a ninth embodiment of the present invention.
1 is a block diagram showing a configuration of a wavelength division type optical communication path according to an embodiment. The difference between the ninth embodiment of the present invention shown in FIG. 11 and the eighth embodiment of the present invention shown in FIG.
M input N output distribution select type optical switch 36-1 to 0-3
In the preceding stage of 6-N, (M × N) regenerative repeater circuits (in this case, it is composed of an optical receiving circuit (OR) and an optical transmitting circuit (OS), but of course, this circuit type is not used. 40-11 to 40-1M, ..., 40- (N-n)
1-40- (N-n) M, 40- (N-n + 1) 1-4
0- (N-n + 1) M, ..., 40-N1 to 40-NM are arranged. As a result, when the distance between the OPXCs is long, or when the OPXCs have a wavelength conversion function (O
It is possible to provide a wavelength variable function on the S side). Further, although FIG. 11 shows an embodiment corresponding to the eighth embodiment, the third embodiment,
Similarly to the fourth embodiment, the fifth embodiment, the sixth embodiment, and the seventh embodiment, (M × N) is provided before the optical switch.
An embodiment in which a plurality of regenerative repeater circuits are arranged is possible.

[Tenth Embodiment] FIG. 12 is a block diagram showing a configuration of a wavelength division type optical communication path according to a tenth embodiment of the present invention. The tenth embodiment of the present invention shown in FIG. 12 differs from the ninth embodiment of the present invention shown in FIG. 11 in that the M input N output distribution selection type optical switch 36 in FIG.
-1 to 36- (N-n) only in the preceding stage, the regenerative repeater circuit 40
-11 to 40-1M, ..., 40- (N-n) 1 to 40-
(N−n) M is provided, and it is not provided in the preceding stage of the M-input / N-output distribution / selection type optical switches 36- (N−n + 1) to 36-N. With the above configuration, M × n regenerative repeater circuits can be further reduced compared to the ninth embodiment. Although FIG. 12 is an embodiment corresponding to the eighth embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, and the seventh embodiment are also Similarly, an embodiment in which (M × (N−n)) regenerative repeater circuits are arranged in the preceding stage of the optical switch is possible.

[0039]

As described above, according to the present invention, when the OPXC and the OLT are realized or integrated in the same station, the interface between the OPXC and the OLT is omitted and the amount of hardware is reduced. However, there is an effect of reducing the device cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wavelength division type optical communication path according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a modification of the wavelength division type optical communication path according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a wavelength division type optical communication path according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a modification of the wavelength division type optical communication path according to the second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a wavelength division type optical communication path according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a wavelength division type optical communication path according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a wavelength division type optical communication path according to a fifth embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a wavelength division type optical communication path according to a sixth embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a wavelength division type optical communication path according to a seventh embodiment of the present invention.

FIG. 10 is a block diagram showing the structure of a wavelength division type optical communication path according to an eighth embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a wavelength division type optical communication path according to a ninth embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a wavelength division type optical communication path according to a tenth embodiment of the present invention.

FIG. 13 is an explanatory diagram showing an example of a relationship between an optical path network and a conventional network.

FIG. 14 is a diagram showing a first configuration example of an OPXC using a wavelength division type optical switch.

15 is a diagram showing a first specific configuration example of the OPXC using the wavelength division type optical switch shown in FIG.

16 is a diagram showing a second specific configuration example of the OPXC using the wavelength division type optical switch shown in FIG.

FIG. 17 is a diagram showing a second configuration example of an OPXC using a wavelength division type optical switch.

18 is a diagram showing a first specific configuration example of the OPXC using the wavelength division type optical switch shown in FIG.

FIG. 19 is a diagram showing a configuration example of an optical path transmission line terminating device (OLT).

[Explanation of symbols]

4-1 to 4-N ... Wavelength separation circuit (wavelength separation unit), 6 ...
(M × N) input (M × N) output optical switch, 8-1 to 8
-N ... Wavelength multiplexing circuit (wavelength multiplexing unit), 12- (N-n +
1) 1 to 12-NM ... Signal converter, 14- (N-n +)
1) 1 to 14-NM ... Signal converter, 16 ... (M × N) input (N × N) output switch, 18-1 to 18-N ... Optical merging circuit (wavelength multiplexer), 20- (N- n + 1) 1-20
-NM ... Signal converter, 24- (N-n + 1) 1-24-
NM ... Signal converter, 30-1 to 30-M ... N input N output space division type optical switch, 34-1 to 34-M ... N input N
Output distribution selection type optical switch, 36-1 to 36-M ... M input N output distribution selection type optical switch, 40-11 to 40-N
M: Regeneration relay circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-292246 (JP, A) JP-A-9-64917 (JP, A) JP-A-59-135988 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04Q 3/52 H04B 10/02 H04J 14/00 H04J 14/02

Claims (6)

(57) [Claims] 1. An N-series wavelength-division-multiplexed optical signal in which M wavelengths are wavelength-multiplexed as signal channels is input, and switching between signal channels is performed, and M wavelengths are wavelength-multiplexed as signal channels, respectively. An optical switch function unit that outputs a wavelength-multiplexed optical signal of a series, and inputs M × n (where n <N / 2) optical signals, converts each to an optical path signal, and performs M wavelength multiplexing. N
In addition to outputting a series of wavelength-multiplexed optical signals, an n-series wavelength-multiplexed optical signal with M wavelength-multiplexed optical path signals is input, wavelength separation is performed, and the signals are converted into signals of an optical communication network different from the optical path network. An optical path termination function unit for outputting M × n optical signals as an output, and an n-sequence output of the optical path termination function unit is an n-sequence input of the N-sequence inputs of the optical switch function unit. A wavelength division type optical communication path in which n series of N series outputs of the optical switch function section are input to the n series of the optical path termination function section, wherein the optical path termination function section and the optical path are provided. by omitting the wavelength multiplexer and wavelength separation of the connecting portion between the switch function unit, as well as connecting a separate optical signal for each wavelength, the optical switch function part, wavelength multiplexing of the input n-n sequence Signals of M each
N-n wavelength demultiplexing units for demultiplexing into signal channels and M N-n series demultiplexing units separated by the wavelength demultiplexing unit.
Output from the signal channel and the optical path termination function unit
Have the same wavelength for M signal channels of n series
M signals are distributed to N series output destinations.
Power N-output space-division optical switch and outputs of the M N-input N-output space-division optical switches
A part of each of the N-n series output destinations is merged.
And a wavelength multiplexing unit, wherein N-n M-wavelength-multiplexed signals corresponding to N-n
Regeneration processing for each optical signal channel is applied to each input of the optical switch.
Perform (N-n) x M regenerative repeater circuits connected
A characteristic wavelength division type optical communication path. 2. The M wavelengths are multi-wavelengths as signal channels.
Input the multiplexed N-series wavelength-multiplexed optical signals and
Each performed interchanging the M wavelength signal switch between channel
N series wavelength-division multiplexed optical signal
The optical switch function section for output and M × n (where n <N / 2) optical signals are input, and
Each is converted into an optical path signal, M wavelength multiplexing is performed, and n
Outputs a series of wavelength-division multiplexed optical signals, and
Is an M-wavelength multiplexed n-series wavelength-multiplexed optical signal
Then, wavelength separation is performed to receive the signal of the optical communication network different from the optical path network.
Optical path termination that converts to M.n. and outputs Mxn optical signals
A functional unit, and outputs the n series of the optical path termination functional unit to the optical switch.
Of the N series of inputs of the functional unit, n series of inputs
Of the N series outputs of the optical switch function unit,
Wavelength-division type optical call with n-sequence input of path termination function
A road, connection between the optical switch function part and said optical path termination function unit
For each wavelength, omitting the wavelength multiplexer and wavelength demultiplexer
And the optical switch function unit receives the input N-n wavelength division multiplexed signals by M number of signals.
N-n wavelength demultiplexing units for demultiplexing into signal channels and M N-n series demultiplexing units separated by the wavelength demultiplexing unit.
Output from the signal channel and the optical path termination function unit
Have the same wavelength for M signal channels of n series
M signals are distributed to N series output destinations.
Power N output distribution selection type optical switch and output of the M N input N output distribution selection type optical switches
A part of each of the N-n series output destinations is merged.
And a wavelength multiplexing unit, wherein N-n M-wavelength-multiplexed signals corresponding to N-n
Regeneration processing for each optical signal channel is applied to each input of the optical switch.
Perform (N-n) x M regenerative repeater circuits connected
A characteristic wavelength division type optical communication path. 3. M number of wavelengths are multi-wavelengths as signal channels.
Input the multiplexed N-series wavelength-multiplexed optical signals and
The channels are switched and M wavelengths are
N series wavelength-division multiplexed optical signal
The optical switch function section for output and M × n (where n <N / 2) optical signals are input, and
Converts to an optical path signal, respectively Re, n perform the M-number of wavelength division multiplexing
Outputs a series of wavelength-division multiplexed optical signals, and
Is an M-wavelength multiplexed n-series wavelength-multiplexed optical signal
Then, wavelength separation is performed to receive the signal of the optical communication network different from the optical path network.
Optical path termination that converts to M.n. and outputs Mxn optical signals
A functional unit, and outputs the n series of the optical path termination functional unit to the optical switch.
Of the N series of inputs of the functional unit, n series of inputs
Of the N series outputs of the optical switch function unit,
Wavelength-division type optical call with n-sequence input of path termination function
A road, connection between the optical switch function part and said optical path termination function unit
For each wavelength, omitting the wavelength multiplexer and wavelength demultiplexer
And the optical switch function unit receives the input N-n wavelength division multiplexed signals by M number of signals.
N-n wavelength demultiplexing units for demultiplexing into signal channels and M N-n series demultiplexing units separated by the wavelength demultiplexing unit.
Output from the signal channel and the optical path termination function unit
Have the same wavelength for M signal channels of n series
N signals to be distributed to N series output destinations.
Power N-output distribution select optical switch and outputs of the N M-input N-output distribution select optical switches
A part of each of the N-n series output destinations is merged.
And a wavelength multiplexing unit, wherein N-n M-wavelength-multiplexed signals corresponding to N-n
Regeneration processing for each optical signal channel is applied to each input of the optical switch.
Perform (N-n) x M regenerative repeater circuits connected
A characteristic wavelength division type optical communication path. 4. The M wavelengths are wavelength-multiplexed as signal channels.
Input the multiplexed N-series wavelength-multiplexed optical signals and
The channels are switched and M wavelengths are
N series wavelength-division multiplexed optical signal
The optical switch function section for output and M × n (where n <N / 2) optical signals are input, and
Each is converted into an optical path signal, M wavelength multiplexing is performed, and n
Outputs a series of wavelength-division multiplexed optical signals, and
Is an M-wavelength multiplexed n-series wavelength-multiplexed optical signal
Then, wavelength separation is performed to receive the signal of the optical communication network different from the optical path network.
M × n pieces of optical path termination shall be the optical signal output is converted into No.
A functional unit, and outputs the n series of the optical path termination functional unit to the optical switch.
Of the N series of inputs of the functional unit, n series of inputs
Of the N series outputs of the optical switch function unit,
Wavelength-division type optical call with n-sequence input of path termination function
A road, corresponding thereto and the output of the n sequences of the light path termination function unit
The wavelength multiplexing unit and the connecting unit with the input of the optical switch function unit
And the wavelength demultiplexer are omitted, and individual optical signals for each wavelength are used.
At the same time as the connection, the optical switch function unit receives the input N-n series wavelength division multiplexed signals by M pieces each.
N-n wavelength demultiplexing units for demultiplexing into signal channels and M N-n series demultiplexing units separated by the wavelength demultiplexing unit.
Output from the signal channel and the optical path termination function unit
Have the same wavelength for M signal channels of n series
M signals are distributed to N series output destinations.
Power N output space division type optical switch and the output of the M N input N output space division type optical switches
N wavelength multiplexing units that join each N-series output destination
, N-n corresponding to N-n M-wavelength multiplexed signals
Regeneration processing for each optical signal channel is applied to each input of the optical switch.
Perform (N-n) x M regenerative repeater circuits connected
A characteristic wavelength division type optical communication path. 5. The M wavelengths are multi-wavelengths as signal channels.
Input the multiplexed N-series wavelength-multiplexed optical signals and
The channels are switched and M wavelengths are
N series wavelength-division multiplexed optical signal
The optical switch function section for output and M × n (where n <N / 2) optical signals are input, and
Each is converted into an optical path signal, M wavelength multiplexing is performed, and n
Outputs a series of wavelength-division multiplexed optical signals, and
Is an M-wavelength multiplexed n-series wavelength-multiplexed optical signal
Then, wavelength separation is performed to receive the signal of the optical communication network different from the optical path network.
Optical path termination that converts to M.n. and outputs Mxn optical signals
A functional unit, and outputs the n series of the optical path termination functional unit to the optical switch.
Of the N series of inputs of the functional unit, n series of inputs
Of the N series outputs of the optical switch function unit,
Wavelength-division type optical call with n-sequence input of path termination function
A road, corresponding thereto and the output of the n sequences of the light path termination function unit
The wavelength multiplexing unit and the connecting unit with the input of the optical switch function unit
And the wavelength demultiplexer are omitted, and individual optical signals for each wavelength are used.
At the same time as the connection, the optical switch function unit receives the input N-n series wavelength division multiplexed signals by M pieces each.
N-n wavelength demultiplexing units for demultiplexing into signal channels and M N-n series demultiplexing units separated by the wavelength demultiplexing unit.
Output from the signal channel and the optical path termination function unit
Have the same wavelength for M signal channels of n series
M signals are distributed to N series output destinations.
Power N output distribution selection type optical switch and the outputs of the M N input N output distribution selection type optical switches
N wavelength multiplexing units that join each N-series output destination
, N-n corresponding to N-n M-wavelength multiplexed signals
Regeneration processing for each optical signal channel is applied to each input of the optical switch.
Perform (N-n) x M regenerative repeater circuits connected
A characteristic wavelength division type optical communication path. 6. The M wavelengths are multi-wavelengths as signal channels.
Input the multiplexed N-series wavelength-multiplexed optical signals and
The channels are switched and M wavelengths are
N series wavelength-division multiplexed optical signal
The optical switch function section for output and M × n (where n <N / 2) optical signals are input, and
Each is converted into an optical path signal, M wavelength multiplexing is performed, and n
Outputs a series of wavelength-division multiplexed optical signals, and
Is an M-wavelength multiplexed n-series wavelength-multiplexed optical signal
Then, wavelength separation is performed to receive the signal of the optical communication network different from the optical path network.
Optical path termination that converts to M.n. and outputs Mxn optical signals
A functional unit, and outputs the n series of the optical path termination functional unit to the optical switch.
Of the N series of inputs of the functional unit, n series of inputs
Of the N series outputs of the optical switch function unit,
Wavelength-division type optical call with n-sequence input of path termination function
A road, corresponding thereto and the output of the n sequences of the light path termination function unit
The wavelength multiplexing unit and the connecting unit with the input of the optical switch function unit
And the wavelength demultiplexer are omitted, and individual optical signals for each wavelength are used.
At the same time as the connection, the optical switch function unit receives the input N-n series wavelength division multiplexed signals by M pieces each.
N-n wavelength demultiplexing units for demultiplexing into signal channels and M N-n series demultiplexing units separated by the wavelength demultiplexing unit.
Output from the signal channel and the optical path termination function unit
Have the same wavelength for M signal channels of n series
N signals to be distributed to N series output destinations.
Power N-output distribution select optical switch and outputs of the N M-input N-output distribution select optical switches
N wavelength multiplexes in which some of them are merged for each output destination of N series
And Nn of the N-n M-wavelength multiplexed signals corresponding to the N-n
Regeneration processing for each optical signal channel is applied to each input of the optical switch.
Perform (N-n) x M regenerative repeater circuits connected
A characteristic wavelength division type optical communication path.