JP3740075B2 - All-optical network and optical path cross-connect - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used for an all-optical network (hereinafter referred to as AON). In particular, the present invention relates to optical path routing control or setting control in consideration of 3R (Reshaping; Retiming; Regenerating) processing, which is a regenerative repeater of optical signals.
[0002]
[Prior art]
AON is being studied as a network for greatly reducing network costs. In AON, individual communication is performed via an optical path set in the network. The AON is composed of an optical path cross-connect (hereinafter referred to as PXC) and a transmission link, and an optical path is set up between the input transmission link and the output transmission link of each PXC in the section from the originating PXC to the terminating PXC. This is done by setting a cross-connect table that holds the connection relationship. As a method for realizing PXC, there is a method using a technique such as TO-SW using a thermo-optic effect or a micro-electromechanical movable mirror.
[0003]
The electrical signal processing device becomes more expensive as the electrical signal speed increases. At present, the range of 10 Gb / s to 40 Gb / s is the upper limit speed at the practical level, and such an electric signal processing apparatus is very expensive. In AON, since an optical signal is transmitted as light, an expensive electric signal processing device is not required, and the network cost is greatly reduced. In addition, since AON is a network in which optical signals are transmitted as they are, there is an advantage that the same network can be used continuously even if the electrical signal processing technology is increased in speed.
[0004]
When setting an optical path in AON, it is necessary to consider transmission characteristics when an optical signal is transmitted through an optical fiber. That is, optical fiber dispersion, dispersion slope, PMD (Polarization Mode Dispersion), ASE (Amplifier Spontaneous Emission), etc. limit the distance that can be transmitted as an optical signal.
[0005]
For example, the upper limit of the transmission distance when signal degradation due to PMD is considered is as shown in FIG. FIG. 7 is a diagram showing the transmission distance limit of all optical signals by PMD, where the horizontal axis represents the bit rate and the vertical axis represents the transmission distance. Here, D is the PMD coefficient of the optical fiber, and the unit is ps / km ^1/2 . Therefore, it is necessary to perform path control so that the transmission distance limit is not exceeded in AON.
[0006]
[Problems to be solved by the invention]
Conventionally, when selecting a path of an optical path, the shortest path is obtained by taking the above transmission characteristics into a constraint. For example, in the document [J. Strand and AL Chiu, “Issues for routing in the optical layer,” IEEE Commun. Mag., Vol. 39, No. 2, pp. 81-87, 2/01], PMD, ASE, etc. It has been proposed that OSPF (Open Shortest Path First) is extended to advertise the flooding parameters and the path control is performed autonomously and distributedly at each node.
[0007]
In such a conventional technique, it is necessary to examine characteristics such as PMD and ASE of an optical fiber. However, it is very troublesome and difficult to examine these characteristics of an already installed optical fiber one by one. In addition, it is complicated to take these constraints into consideration when calculating the shortest path, and it is not easy to determine where to perform 3R relay.
[0008]
In addition, the reliability of the results obtained by such calculations is not necessarily high, and as a practical safety measure, measures such as providing an extra 3R implementation location are necessary, and effective use of network resources is required. Not desirable.
[0009]
The present invention has been carried out against this background, and can reduce the labor and time required for setting the 3R implementation location, can specify the exact 3R implementation location, An object of the present invention is to provide an AON and PXC, a program, a recording medium, and a 3R processing method that can be effectively used.
[0010]
In this specification, the originating side PXC and the terminating side PXC are referred to as the originating side PXC, which transmits the request for setting the optical path prior to the data transfer. This PXC is called the PXC on the called side. When data is transferred after the optical path is set, either the originating PXC or the terminating PXC can be the data transmission source or the data reception destination. The set path may be a unidirectional path or a bidirectional path.
[0011]
[Means for Solving the Problems]
According to the present invention, it is not necessary to calculate at which location the 3R processing needs to be performed on the AON, and the labor and time required for setting the optical path can be reduced. Furthermore, since the 3R implementation location is experimentally determined, the position is accurate, and there is no need to provide an extra 3R implementation location, so that network resources can be effectively used.
[0012]
That is, the first aspect of the present invention includes a plurality of PXCs and a transmission link that interconnects the plurality of PXCs, and an optical path is set between the originating PXC and the terminating PXC. This optical path is an AON relayed by a plurality of PXCs.
[0013]
Here, the present invention is characterized in that the PXC has means for branching an optical signal transmitted through the optical path and means for converting one optical signal branched by the branching means into an electrical signal. And means for detecting the signal quality deterioration of the electric signal, and when the detection result of the means for detecting detects the signal quality deterioration of the electric signal, the signal PXC direction from the own PXC to the originating side on the optical path. Means for sending a 3R instruction indicating that it is necessary to perform 3R processing on an optical signal transmitted through the optical path to another PXC, and transmission by the optical path when the own PXC receives the 3R instruction And means for 3R processing the optical signal to be processed.
[0014]
Furthermore, a means for notifying other PXCs of the usage status of the 3R processing means is provided, and the means for sending the 3R instruction refers to the announcement and indicates the usage status of the means for 3R processing in the other PXC. And the closest proximity capable of accepting the 3R instruction issued by the own PXC among the other PXCs in the PXC direction on the originating side of the PXC on the optical path based on the recognition result of the recognition means It is desirable to provide a means for sending a 3R instruction to the other PXC.
[0015]
Alternatively, a means for notifying other PXCs of the usage status of the 3R processing means is provided, and the means for sending the 3R instruction refers to the notification and the usage status of the means for 3R processing in the other PXC. Based on the recognition result of the recognizing means, and the most 3R that can accept the 3R instruction issued by the own PXC among the other PXCs in the PXC direction on the outgoing side of the PXC on the optical path. It is desirable to provide means for sending a 3R instruction to another PXC having a high margin of processing capability.
[0016]
Here, the margin of 3R processing capability means, for example, that the 3R processing means can perform 3R processing on a plurality of optical paths in parallel, and actually performs processing for the maximum number of parallel processing optical paths. The ratio of the number of optical paths for which 3R is performed can be set as a margin of 3R processing capability.
[0017]
As a result, it is possible to select a PXC to be 3R-processed according to the margin of the capability to perform the 3R process, so that network resources can be used effectively. For example, when the 3R processing means in the PXC immediately before the PXC in which the signal quality deterioration is detected is blocked, a 3R instruction is further transmitted to the preceding PXC. When the 3R processing means is blocked even in the PXC, a free 3R processing means is utilized by giving the 3R instruction upstream, such as sending a 3R instruction to the preceding PXC. Network resources can be used effectively. Alternatively, if there is a margin in the 3R processing means in the immediately preceding PXC, but there is a larger margin in the 3R processing means in the preceding PXC, a 3R instruction is sent to the PXC with the larger margin In this way, it is possible to effectively use network resources.
[0018]
The second aspect of the present invention is PXC, and the feature of the present invention is that it includes a plurality of PXCs and a transmission link that interconnects the plurality of PXCs. An optical path is set between the PXC and this optical path is applied to the AON relayed by a plurality of PXCs. The optical signal transmitted by the optical path is branched by the branching means. Means for converting the other optical signal into an electric signal, means for detecting signal quality deterioration of the electric signal, and when the detection result of the detecting means detects the signal quality deterioration of the electric signal, Means for sending a 3R instruction indicating that it is necessary to perform 3R processing on an optical signal transmitted through the optical path to another PXC in the PXC direction on the originating side of the own PXC, and the own PXC The 3R finger Upon receipt of a is in regard to the light signal transmitted by the optical path and means for 3R process.
[0019]
Furthermore, a means for notifying other PXCs of the usage status of the 3R processing means is provided, and the means for sending the 3R instruction refers to the announcement and indicates the usage status of the means for 3R processing in the other PXC. And the closest proximity capable of accepting the 3R instruction issued by the own PXC among the other PXCs in the PXC direction on the originating side of the PXC on the optical path based on the recognition result of the recognition means It is desirable to provide a means for sending a 3R instruction to the other PXC.
[0020]
Alternatively, a means for notifying other PXCs of the usage status of the 3R processing means is provided, and the means for sending the 3R instruction refers to the notification and the usage status of the means for 3R processing in the other PXC. Based on the recognition result of the recognizing means, and the most 3R that can accept the 3R instruction issued by the own PXC among the other PXCs in the PXC direction on the outgoing side of the PXC on the optical path. It is desirable to provide means for sending a 3R instruction to another PXC having a high margin of processing capability.
[0021]
According to a third aspect of the present invention, when installed in an information processing apparatus, the information processing apparatus includes a plurality of PXCs and a transmission link that interconnects the plurality of PXCs. An optical path is set up with the PXC on the called side, and this optical path is applied to an all-optical network that is relayed by a plurality of PXCs, and branches an optical signal transmitted through the optical path. Is a program that realizes a function as a device for controlling a PXC that converts an optical signal into an electrical signal, detects signal quality degradation of the electrical signal, and performs 3R processing on the optical signal transmitted through the optical path.
[0022]
Here, a feature of the present invention is that when the detection result detects signal quality deterioration of the electrical signal, another PXC in the PXC direction on the outgoing side than the PXC controlled by itself on the optical path. And a function of transmitting a 3R instruction indicating that it is necessary to perform 3R processing on an optical signal transmitted through the optical path.
[0023]
Further, the function of notifying the margin of the capability of 3R processing to another PXC is realized, and the capability of performing the 3R processing in another PXC with reference to the announcement as a function of sending the 3R instruction And a 3R instruction issued by a PXC controlled by itself among other PXCs in the PXC direction on the originating side of the PXC controlled by itself on the optical path based on the recognition result of the recognized function It is desirable to realize a function of sending a 3R instruction to the nearest other PXC that can accept
[0024]
Alternatively, the function of notifying the margin of the capability of 3R processing to other PXCs is realized, and the capability of performing the 3R processing in other PXCs with reference to the announcement as a function of sending the 3R instruction And a 3R instruction issued by a PXC controlled by itself among other PXCs in the PXC direction on the originating side of the PXC controlled by itself on the optical path based on the recognition result of the recognized function It is desirable to realize a function of sending a 3R instruction to another PXC having the highest margin of 3R processing capability capable of accepting.
[0025]
A fourth aspect of the present invention is the information processing apparatus-readable recording medium on which the program of the present invention is recorded. By recording the program of the present invention on the recording medium of the present invention, the information processing apparatus can install the program of the present invention using this recording medium. Alternatively, the program of the present invention can be directly installed in the information processing apparatus via a network from a server holding the program of the present invention.
[0026]
As a result, it is possible to reduce the labor and time required for setting the 3R implementation location by using an information processing device such as a computer device, and it is possible to specify the exact 3R implementation location and to effectively use network resources. PXC and AON that can be realized can be realized.
[0027]
A fifth aspect of the present invention includes a plurality of PXCs and a transmission link that interconnects the plurality of PXCs, and an optical path is set between the originating PXC and the terminating PXC. The optical path is a 3R processing method applied to AON relayed by a plurality of PXCs.
[0028]
Here, the feature of the present invention is that the optical signal transmitted through the optical path is branched by the PXC, and one of the branched optical signals is converted into an electric signal to thereby convert the signal quality of the electric signal. Deterioration is detected, and when the detection result detects signal quality degradation of the electrical signal, the PXC in the PXC direction on the originating side of the PXC that has detected the quality degradation of the electrical signal on the optical path A 3R instruction indicating that it is necessary to perform 3R processing on the optical signal transmitted through the optical path is transmitted, and the PXC that has received the 3R instruction performs 3R processing on the optical signal transmitted through the optical path. is there.
[0029]
Further, each PXC advertises the capacity of 3R processing capability to other PXC, and when the PXC sends a 3R instruction, the 3R processing in the other PXC is referred to with reference to the notification received from the other PXC. PXC that transmits the 3R instruction on the optical path based on the recognition result, and is closest to the PXC in the PXC direction on the originating side that can accept the 3R instruction based on the recognition result. It is desirable to send 3R instructions to other PXCs.
[0030]
Alternatively, each PXC advertises the margin of 3R processing capability to the other PXC, and when the PXC sends a 3R instruction, the 3R processing in the other PXC is referred to by referring to the notification received from the other PXC. The most 3R processing that can accept the 3R instruction among other PXCs in the PXC direction on the originating side than the PXC that transmits the 3R instruction on the optical path based on the recognition result It is desirable to send a 3R instruction to another PXC having a high capacity margin.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of the PXC of this embodiment. FIG. 2 is a block diagram of the 3R trunk of this embodiment. FIG. 3 is a conceptual diagram of AON in this embodiment. 4 to 6 are diagrams for explaining the 3R processing method of this embodiment.
[0032]
As shown in FIG. 3, the present embodiment includes a plurality of PXCs and a transmission link that interconnects the plurality of PXCs. The source PXC (A) and the destination PXC (J) An optical path (solid line) is set between them, and this optical path is an AON relayed by a plurality of PXCs (B, C, D, E, F, G, H, I).
[0033]
Here, the feature of the present invention is that, as shown in FIG. 1, the PXC is shown in FIG. 2 as an optical branching device 10 for branching an optical signal transmitted through the optical path and a trunk for 3R. As described above, the photoelectric conversion unit 1 that converts one optical signal branched by the optical splitter 10 into an electrical signal, the signal quality degradation detection unit 2 that detects signal quality degradation of the electrical signal, and the signal quality When the detection result of the deterioration detection unit 2 detects the signal quality deterioration of the electric signal, the light transmitted through the optical path to another PXC in the PXC (A) direction on the optical path from the own PXC. A 3R instruction unit 3 for transmitting a 3R instruction indicating that it is necessary to perform 3R processing on the signal; and 3R processing for performing 3R processing on an optical signal transmitted through the optical path when the own PXC receives the 3R instruction. Part 4 In the place it was painting.
[0034]
Further, the 3R trunk 20 includes a usage status notifying unit 6 for notifying the usage status of the 3R processing unit 4 to other optical path cross-connects. 3R processing unit 4 is recognized, and on the basis of the recognition result, a 3R instruction issued by the own PXC among other PXCs in the PXC (A) direction on the light source side of the own light PXC on the optical path is issued. Send a 3R indication to the nearest other PXC that is acceptable.
[0035]
Alternatively, the 3R trunk 20 includes a usage status notification unit 6 that notifies the usage status of the 3R processing unit 4 to other optical path cross-connects. 3R processing unit 4 is recognized, and on the basis of the recognition result, a 3R instruction issued by the own PXC among other PXCs in the PXC (A) direction on the light source side of the own light PXC on the optical path is issued. A 3R instruction is sent to another PXC having the highest margin of 3R processing capability that can be accepted.
[0036]
Note that the 3R trunk 20 can perform 3R processing on a plurality of optical paths in parallel, but in this embodiment, the number of optical paths that are actually processed with respect to the maximum number of parallel processing optical paths. Let the ratio be the margin of 3R processing capacity.
[0037]
An apparatus (not shown) for controlling the PXC according to the present embodiment can be realized by a computer apparatus that is an information processing apparatus. That is, a program that, when installed in a computer device, causes the computer device to realize a function as a device that controls the PXC shown in FIG. 1, and the detection result of the signal quality deterioration detection unit 2 detects the signal quality deterioration. 3R indicating that it is necessary to perform 3R processing on the optical signal transmitted by the optical path to another PXC in the PXC (A) direction on the outgoing side of the PXC controlled by itself on the optical path By installing a program that realizes a function corresponding to the 3R instruction unit 3 that transmits an instruction, an apparatus for controlling the PXC of this embodiment can be realized using the computer apparatus.
[0038]
Furthermore, the program according to the present embodiment is installed in a computer device, and corresponds to the usage status notification unit 6 that notifies the computer device of the 3R processing capability of the 3R processing unit 4 to other PXCs. As a function corresponding to the 3R instruction unit 3, a function for recognizing the margin of the ability to perform the 3R processing in another PXC with reference to the notification, and a recognition result of the function to be recognized 3R with respect to the closest PXC that can accept the 3R instruction issued by the PXC controlled by itself among other PXCs in the PXC (A) direction on the outgoing side of the PXC controlled by itself on the optical path And a function to send instructions.
[0039]
Or the program of a present Example is suitable for the use condition notification part 6 which announces the margin of the capability of 3R processing of 3R processing part 4 to other PXC by installing in the computer apparatus. As a function corresponding to the 3R instruction unit 3, a function for recognizing the margin of the ability to perform the 3R processing in another PXC with reference to the notification, and a recognition result of the function to be recognized Among other PXCs in the PXC (A) direction on the outgoing side of the PXC controlled by itself on the optical path, the other 3R processing capability with the highest margin that can accept the 3R instruction issued by the PXC controlled by itself And a function of sending a 3R instruction to the PXC.
[0040]
By recording the program of the present embodiment on the recording medium of the present embodiment, the computer apparatus can install the program of the present embodiment using this recording medium. Alternatively, the program of this embodiment can be directly installed on the computer device from the server holding the program of this embodiment via the network.
[0041]
Accordingly, it is possible to reduce the labor and time required for setting the 3R implementation location using a computer device, and it is possible to specify an accurate 3R implementation location and to effectively use network resources. And AON can be realized.
[0042]
Hereinafter, this embodiment will be described in more detail.
[0043]
The configuration of the PXC of this embodiment is shown in FIG. The PXC includes an optical branching unit 10, an AON switch (OSW) unit 30, a 3R trunk 20, and an optical multiplexer 40. If the optical signal does not deteriorate, it is output directly from the input port to the output port without going through the 3R trunk 20. As for the optical signal that deteriorates, the optical signal is once drawn into the 3R trunk 20 and subjected to 3R processing, and then output toward a desired output port. In the 3R processing, the optical signal is once converted into an electrical signal, and then the 3R processing is performed.
[0044]
In the present embodiment, when an optical path is set, an optical signal is input from the originating side PXC (A), and the optical signal is sequentially drawn into the 3R trunk 20 at the midway PXC, the reception state is monitored, and the signal quality is monitored. If there is no degradation, a cross-connect table is set directly from the input port to the output port. If there is signal quality degradation, the PXC goes back to the previous stage PXC and pulls it into the 3R trunk 20 to regenerate the optical signal. After that, set the cross-connect table to output to the output port. In this way, the optical signal is adaptively drawn into the 3R trunk 20.
[0045]
A 3R processing method in the AON of this embodiment will be described with reference to FIGS. First, as shown by the solid line in FIG. 3, an optical path is set along the shortest path that minimizes the cost between the originating PXC (A) and the terminating PXC (J). Here, the degradation of the optical signal is not a limiting condition for the path control. Instead, as described above, the degradation state of the optical path signal transmitted from the originating side PXC (A) is monitored during the optical path setting signaling. In the example of FIG. 4, the optical signal is drawn into the 3R trunk 20 by the PXC preceding the PXC in which the deterioration is detected.
[0046]
In addition, as shown in FIG. 5, when the 3R trunk 20 is blocked by the PXC in the previous stage and cannot be captured, the process returns to the previous stage and attempts to capture the 3R trunk 20. If the optical path cannot be finally set along the shortest path, the optical path setting by the shortest path is given up and an attempt is made to set the optical path along a different second shortest path. The route indicated by the alternate long and short dash line in FIG. 3 is another shortest route candidate.
[0047]
That is, since the electrical signal can be monitored at the end of 3R, the optical path can be segmented there to detect a failure with high accuracy such as bit error monitoring. A reliable optical path can be operated by setting a spare optical path for each section.
[0048]
In addition, as shown in FIG. 6, in order to give a margin to the usage state of the 3R trunk 20, each PXC notifies the other PXC of the usage status of the 3R trunk 20 of its own PXC and notifies the 3R trunk 20. It is possible to specify that 3R processing is performed in a PXC having a lot of free space. In the example of FIG. 6, the 3R trunk 20 is vacant in both the previous and second PXCs of the PXC in which the signal quality degradation is detected, and 3R processing is possible in any PXC, but the 3R trunk 20 3R processing is performed by the previous two PXCs in consideration of the margin of the processing capability.
[0049]
(Example summary)
In 3R processing, an optical signal is once converted into an electrical signal, and then 3R processing is performed. For this reason, it is necessary to perform processing in consideration of the bit rate of the signal. A high-speed electrical signal processing apparatus is expensive, and it is desirable to keep the 3R processing amount to the minimum necessary for economically configuring a network. From this point of view, the AON according to the present embodiment can perform the 3R process at a place where the 3R process is really necessary, so that it is possible to avoid performing the 3R process more than necessary.
[0050]
In order to cope with the increase in the speed of optical signals due to the advancement of transmission technology, it is desirable that the 3R processing has a detachable configuration. From this point of view, the AON shown in this embodiment is effective.
[0051]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the labor and time required for setting the 3R implementation location, and it is possible to specify the exact 3R implementation location and to effectively use network resources. Can do.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram of a PXC according to the present embodiment.
FIG. 2 is a block diagram of a 3R trunk according to the present embodiment.
FIG. 3 is a conceptual diagram of AON in the present embodiment.
FIG. 4 is a diagram for explaining a 3R processing method according to the present embodiment (3R processing by the immediately preceding PXC);
FIG. 5 is a diagram for explaining a 3R processing method according to the present embodiment (3R processing by PXC other than immediately before).
FIG. 6 is a diagram for explaining a 3R processing method according to the present embodiment (3R processing according to capacity allowance);
FIG. 7 is a diagram showing a transmission distance limit of an all optical signal by PMD.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Photoelectric conversion part 2 Signal quality degradation detection part 3 3R instruction | indication part 4 3R processing part 5 Electro-optical conversion part 6 Usage condition notification part 10 Optical branching device 20 3R trunk 30 Switch part 40 Optical multiplexer

Claims (13)

A plurality of optical path cross-connects and a transmission link for connecting the plurality of optical path cross-connects to each other,
An optical path is set between the originating optical path cross-connect and the terminating optical path cross-connect,
This optical path is an all-optical network relayed by multiple optical path cross-connects.
The optical path cross-connect is
Means for branching an optical signal transmitted by the optical path;
Means for converting one optical signal branched by the branching means into an electrical signal;
Means for detecting signal quality degradation of the electrical signal;
When the detection result of the detecting means detects the signal quality deterioration of the electrical signal, the optical path cross-connect in the direction of the optical path cross-connect on the emission side of the optical path is connected to the optical path cross-connect on the optical path. Means for sending a 3R instruction indicating that it is necessary to perform 3R (Reshaping; Retiming; Regenerating) processing on an optical signal transmitted through the optical path;
An all-optical network comprising: means for performing 3R processing on an optical signal transmitted through the optical path when the own optical path cross-connect receives the 3R instruction. Means for notifying other optical path cross-connects of the usage status of the means for processing 3R,
The means for sending the 3R instruction is:
Means for recognizing the usage status of the means for processing 3R in another optical path cross-connect with reference to the announcement;
Based on the recognition result of the recognizing means, the 3R instruction that the optical path cross-connect emits among the other optical path cross-connects on the optical path in the direction of the optical path cross-connect on the emission side of the optical path cross-connect 2. The all-optical network according to claim 1, further comprising: means for sending a 3R instruction to another optical path cross-connect that is closest to the network. Means for notifying other optical path cross-connects of the usage status of the means for processing 3R,
The means for sending the 3R instruction is:
Means for recognizing the usage status of the means for processing 3R in another optical path cross-connect with reference to the announcement;
Based on the recognition result of the recognizing means, the 3R instruction that the optical path cross-connect emits among the other optical path cross-connects on the optical path in the direction of the optical path cross-connect on the emission side with respect to the optical path cross-connect 2. The all-optical network according to claim 1, further comprising: means for transmitting a 3R instruction to another optical path cross-connect having the highest margin of 3R processing capability capable of accepting A plurality of optical path cross-connects and a transmission link for connecting the plurality of optical path cross-connects to each other,
An optical path is set between the originating optical path cross-connect and the terminating optical path cross-connect,
This optical path is applied to all-optical networks relayed by multiple optical path cross-connects.
Means for branching an optical signal transmitted by the optical path;
Means for converting one optical signal branched by the branching means into an electrical signal;
Means for detecting signal quality degradation of the electrical signal;
When the detection result of the detecting means detects the signal quality deterioration of the electrical signal, the optical path cross-connect in the direction of the optical path cross-connect on the emission side of the optical path is connected to the optical path cross-connect on the optical path. Means for transmitting a 3R instruction indicating that it is necessary to perform 3R processing on an optical signal transmitted through the optical path;
An optical path cross-connect comprising: means for performing 3R processing on an optical signal transmitted through the optical path when the own optical path cross-connect receives the 3R instruction. Means for notifying other optical path cross-connects of the usage status of the means for processing 3R,
The means for sending the 3R instruction is:
Means for recognizing the usage status of the means for processing 3R in another optical path cross-connect with reference to the announcement;
Based on the recognition result of the recognizing means, the 3R instruction that the optical path cross-connect emits among the other optical path cross-connects on the optical path in the direction of the optical path cross-connect on the emission side with respect to the optical path cross-connect 5. An optical path cross-connect according to claim 4, further comprising means for sending a 3R instruction to another closest optical path cross-connect capable of accepting Means for notifying other optical path cross-connects of the usage status of the means for processing 3R,
The means for sending the 3R instruction is:
Means for recognizing the usage status of the means for processing 3R in another optical path cross-connect with reference to the announcement;
Based on the recognition result of the recognizing means, the 3R instruction that the optical path cross-connect emits among the other optical path cross-connects on the optical path in the direction of the optical path cross-connect on the emission side with respect to the optical path cross-connect 5. An optical path cross-connect according to claim 4, further comprising means for sending a 3R instruction to another optical path cross-connect having the highest margin of 3R processing capability capable of accepting By installing on an information processing device,
A plurality of optical path cross-connects and a transmission link for connecting the plurality of optical path cross-connects to each other,
An optical path is set between the originating optical path cross-connect and the terminating optical path cross-connect,
This optical path is applied to all-optical networks relayed by multiple optical path cross-connects.
An optical signal transmitted through the optical path is branched, one of the branched optical signals is converted into an electrical signal, signal quality degradation of the electrical signal is detected, and an optical signal transmitted through the optical path is converted into 3R In a program that realizes the function as a device that controls the optical path cross-connect to be processed,
When the detection result detects signal quality degradation of the electrical signal, the optical path cross-connect in the direction of the optical path cross-connect on the emission side with respect to the optical path cross-connect controlled by itself on the optical path A program for realizing a function of sending a 3R instruction indicating that it is necessary to perform 3R processing on an optical signal transmitted through a path. Realize the function to advertise the margin of 3R processing capability to other optical path cross-connects,
As a function of sending the 3R instruction,
A function of recognizing a margin of the 3R processing capability in another optical path cross-connect with reference to the announcement;
Based on the recognition result of this recognition function, the optical path controlled by itself among other optical path cross-connects in the direction of the optical path cross-connect on the originating side than the optical path cross-connect controlled by itself on the optical path 8. The program according to claim 7, which realizes a function of sending a 3R instruction to another closest optical path cross-connect that can accept a 3R instruction issued by the cross connect. Realize the function to advertise the margin of 3R processing capability to other optical path cross-connects,
As a function of sending the 3R instruction,
A function of recognizing a margin of the 3R processing capability in another optical path cross-connect with reference to the announcement;
Based on the recognition result of this recognition function, the optical path controlled by itself among other optical path cross-connects in the direction of the optical path cross-connect on the originating side than the optical path cross-connect controlled by itself on the optical path 8. The program according to claim 7, wherein the program realizes a function of sending a 3R instruction to another optical path cross-connect having a maximum margin of 3R processing capability capable of accepting a 3R instruction issued by the cross connect. 10. A recording medium readable by the information processing apparatus on which the program according to claim 7 is recorded. A plurality of optical path cross-connects and a transmission link for connecting the plurality of optical path cross-connects to each other,
An optical path is set between the originating optical path cross-connect and the terminating optical path cross-connect,
This optical path is a 3R processing method applied to an all-optical network relayed by a plurality of optical path cross-connects.
An optical signal transmitted through the optical path is branched by the optical path cross-connect, and one of the branched optical signals is converted into an electric signal to detect signal quality deterioration of the electric signal. When the signal quality degradation of the electrical signal is detected, the optical path cross-connect in the direction of the optical path cross-connect on the outgoing side is more than the optical path cross-connect on which the quality degradation of the electrical signal is detected on the optical path. A 3R instruction indicating that it is necessary to perform 3R processing on the optical signal transmitted through the optical path is sent, and the optical signal transmitted through the optical path is subjected to 3R processing in the optical path cross-connect that has received the 3R instruction. 3R processing method characterized by performing. Each optical path cross-connect notifies the other optical path cross-connect of the margin of capability for 3R processing, and when the optical path cross-connect sends a 3R instruction, the notification received from the other optical path cross-connect Referring to the optical path cross-connect on the originating side of the optical path cross-connect that recognizes the margin of the 3R processing capability in another optical path cross-connect and sends a 3R instruction on the optical path based on the recognition result. 12. The 3R processing method according to claim 11, wherein the 3R instruction is transmitted to another optical path cross-connect closest to the 3R instruction that can accept the 3R instruction among other optical path cross-connects in the connection direction. Each optical path cross-connect notifies the other optical path cross-connect of the margin of capability for 3R processing, and when the optical path cross-connect sends a 3R instruction, the notification received from the other optical path cross-connect Referring to the optical path cross-connect on the originating side of the optical path cross-connect that recognizes the margin of the 3R processing capability in another optical path cross-connect and sends a 3R instruction on the optical path based on the recognition result. 12. The 3R processing method according to claim 11, wherein the 3R instruction is transmitted to another optical path cross-connect having the highest margin of 3R processing capability capable of accepting the 3R instruction among other optical path cross-connects in the connection direction. .

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