JP7058535B2 - How to check the connection of optical fiber in an optical transmission device - Google Patents

Description

The present invention relates to a method for confirming the connection of an optical fiber in an optical transmission device which is a WDM (Wavelength Division Multiplexing) device having a CDC (Colorless Directionless Contentionless) function.

Conventionally, there is a problem that the number of optical fibers provided in a WDM device connected to a multi-way road is large and a connection error is likely to occur. Further, with the spread of the wavelength-independent function, an error in connection of an optical fiber in a WDM device is more likely to occur. As a countermeasure against such a problem, a WDM device including a wavelength selection switch is disclosed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-144013

In Patent Document 1, even if an optical fiber is erroneously connected, it does not affect the main signal. On the other hand, in WDM devices having a wavelength-independent function, a configuration in which some wavelength selection switches are replaced with optical couplers is increasing for the purpose of cost reduction. In a configuration in which the wavelength selection switch is replaced with an optical coupler, the main signal may be interrupted if the optical fiber is connected incorrectly. Therefore, in a configuration in which the wavelength selection switch is replaced with an optical coupler, it is important to confirm whether the optical fiber is normally connected, but in the past, it was possible to confirm whether the optical fiber was normally connected. There wasn't.

The present invention has been made to solve such a problem, and provides a method for confirming the connection of an optical fiber in an optical transmission device capable of confirming whether or not the optical fiber is normally connected. The purpose.

In order to solve the above problems, the optical fiber connection confirmation method in the optical transmission device according to the present invention includes an optical amplification unit, an OXC (Optical Cross Connect) unit connected to the optical amplification unit by an optical fiber, and an OXC unit. An optical fiber demultiplexing unit, an optical switch unit connected to the optical fiber demultiplexing unit by an optical fiber, an optical transmission / reception unit connected to the optical switch unit by an optical fiber, and an optical coupler. It is a method of confirming the connection of an optical fiber in an optical transmission device capable of transmitting and receiving optical signals in multiple paths, and the wavelength of the optical signal transmitted and received by the optical transmission / reception unit is set to an unused wavelength, an OXC unit, an optical switch unit, and the like. And the optical transmitter / receiver is set to a preset out-of-service wavelength, and the connection of the optical fiber in the optical transmission device is confirmed using the unused wavelength or the out-of-service wavelength, and the optical fiber connection is supported in the predetermined direction. If the optical switch unit and the optical fiber demultiplexing unit are connected by an optical fiber and the OXC unit corresponding to the predetermined route does not detect an optical signal of an unused wavelength or an out-of-service wavelength, the predetermined one. Each of the optical amplification unit, the OXC unit, the optical demultiplexing unit, the optical switch unit, and the optical transmission / reception unit has a monitor for detecting the optical level of the optical signal by determining that there is an error in the connection of the optical fiber in the road .

According to the present invention, the method for confirming the connection of an optical fiber in an optical transmission device is as follows: an optical amplification unit, an OXC (Optical Cross Connect) unit connected to the optical amplification unit by an optical fiber, and an OXC unit connected by an optical fiber. Transmission and reception of optical signals in multiple paths, including an optical demultiplexing unit, an optical switch unit connected to the optical demultiplexing unit by an optical fiber, an optical transmission / reception unit connected to an optical switch unit by an optical fiber, and an optical coupler. It is a method of confirming the connection of an optical fiber in an optical transmission device, and the wavelength of an optical signal transmitted / received by the optical transmission / reception unit can be an unused wavelength, or an OXC unit, an optical switch unit, and an optical transmission / reception unit can be used. Set to the preset out-of-service wavelength, check the connection of the optical fiber in the optical transmission device using the unused wavelength or the out-of-service wavelength, and check the optical fiber connection with the optical switch unit corresponding to the predetermined direction. When the wave part is connected by an optical fiber and the OXC part corresponding to the predetermined direction does not detect an optical signal of an unused wavelength or an out-of-service wavelength, the optical fiber is connected in the predetermined direction. Since it is determined that there is an error, each of the optical amplification unit, the OXC unit, the optical demultiplexing unit, the optical switch unit, and the optical transmission / reception unit has a monitor for detecting the optical level of the optical signal, so that the optical fiber is normally connected. It becomes possible to confirm whether it is done.

It is a block diagram which shows an example of the structure of the optical transmission apparatus according to Embodiment 1 of this invention. It is a flowchart which shows an example of the operation of the optical transmission apparatus by Embodiment 1 of this invention. It is a flowchart which shows an example of the operation of the optical transmission apparatus by Embodiment 1 of this invention. It is a flowchart which shows an example of the operation of the optical transmission apparatus by Embodiment 1 of this invention. It is a block diagram which shows an example of the structure of the optical transmission apparatus according to Embodiment 2 of this invention. It is a flowchart which shows an example of the operation of the optical transmission apparatus by Embodiment 2 of this invention. It is a flowchart which shows an example of the operation of the optical transmission apparatus by Embodiment 2 of this invention. It is a block diagram which shows an example of the structure of an optical transmission device by a prerequisite technique. It is a block diagram which shows an example of the structure of an optical transmission device by a prerequisite technique.

Embodiments of the present invention will be described below with reference to the drawings.

<Prerequisite technology>
First, the prerequisite technique that is the premise of the present invention will be described.

FIG. 8 is a block diagram showing an example of the configuration of an optical transmission device based on the prerequisite technique.

As shown in FIG. 8, the optical transmission device based on the prerequisite technique includes an optical amplification unit 1, an OXC (Optical Cross Connect) unit 2, an optical junction demultiplexing unit 3, an optical switch unit 4, and an optical transmission / reception unit 5. Each part is connected by an optical fiber. The OXC unit 2 has a wavelength selection switch 21 and an OCM (Optical Channel Monitor) 23. The optical demultiplexing unit 3 has a wavelength selection switch 35. The optical switch unit 4 has an optical switch 41. The optical transmission / reception unit 5 has a transponder 53.

In the optical transmission device shown in FIG. 8, when the optical fiber connection between the optical switch unit 4 and the optical demultiplexing unit 3 is incorrect, the optical signal input to / from each port of the optical demultiplexing unit 3 by the wavelength selection switch 35 is input. It is possible to select the wavelength. That is, even if the optical fiber is erroneously connected, it does not affect the main signal.

FIG. 9 is a block diagram showing an example of the configuration of an optical transmission device based on the prerequisite technique.

The optical transmission device shown in FIG. 9 has a configuration in which the wavelength selection switch 35 of the optical junction demultiplexing unit 3 shown in FIG. 8 is replaced with an optical coupler 31. Other configurations are the same as those of the optical transmission device shown in FIG.

In the optical transmission device shown in FIG. 9, when the connection of the optical fiber between the optical switch unit 4 and the optical junction demultiplexing unit 3 is incorrect, for example, each light depends on the wavelength of the optical signal transmitted from each optical transmission / reception unit 5. The optical signal transmitted from the transmission / reception unit 5 may collide with the optical coupler 31. Therefore, it is important to confirm whether the optical fiber is normally connected in the configuration in which the wavelength selection switch is replaced with the optical coupler.

The present invention makes it possible to confirm whether or not an optical fiber is normally connected in an optical transmission device having an optical coupler. Hereinafter, it will be described in detail.

<Embodiment 1>
<Structure>
FIG. 1 is a block diagram showing an example of the configuration of an optical transmission device according to the first embodiment of the present invention.

As shown in FIG. 1, the optical transmission device according to the first embodiment includes an optical amplification unit 1, an OXC unit 2, an optical junction demultiplexing unit 3, an optical switch unit 4, and an optical transmission / reception unit 5. There is.

The optical amplifier 1 is provided as many as the number of routes connected to the transmission device. Further, the optical amplification unit 1 has a transmission side monitor 11 and a reception side monitor 12. The transmission side monitor 11 monitors the optical level of the optical transmission signal, which is an optical signal at the time of transmission, in the optical amplification unit 1. The reception side monitor 12 monitors the optical level of the optical reception signal, which is the received optical signal, in the optical amplification unit 1.

The OXC unit 2 is connected to the optical amplification unit 1 by an optical fiber, and is provided with as many routes as the number of routes connected to the transmission device. Further, the OXC unit 2 has a wavelength selection switch 21, a wavelength selection switch 22, an OCM 23, and a reception side monitor 24. The wavelength selection switch 21 is provided on the transmitting side, and can be set to pass or block an arbitrary wavelength with respect to the connection port with the optical junction demultiplexing unit 3. The wavelength selection switch 22 is provided on the receiving side, and can be set to pass or block an arbitrary wavelength with respect to the connection port with the optical junction demultiplexing unit 3. The OCM 23 can monitor the optical level for each channel input from each connection port of the wavelength selection switch 21. The receiving side monitor 24 monitors the optical level of the optical receiving signal in the OXC unit 2.

The optical demultiplexing unit 3 is connected to the OXC unit 2 by an optical fiber, and a plurality of optical demultiplexing units 3 are provided for each route connected to the transmission device. Further, the optical duplexing unit 3 has an optical coupler 31, an optical coupler 32, a transmitting side monitor 33, and a receiving side monitor 34. The optical coupler 31 is provided on the transmission side and has a function of combining optical transmission signals transmitted from each optical transmission / reception unit 5. The optical coupler 32 is provided on the receiving side and has a function of demultiplexing the optical reception signal. The transmission side monitor 33 monitors the optical level of the optical transmission signal in the optical junction demultiplexing unit 3. The receiving side monitor 34 monitors the optical level of the optical reception signal in the optical combined demultiplexing unit 3.

The optical switch section 4 is connected to the optical junction demultiplexing section 3 by an optical fiber. Further, the optical switch unit 4 has an optical switch 41, an optical switch 42, a transmitting side monitor 43, and a receiving side monitor 44. The optical switch 41 is provided on the transmitting side and has one output port for each direction. The optical switch 42 is provided on the receiving side and has one input port for each direction. The transmission side monitor 43 monitors the optical level of the optical transmission signal in the optical switch unit 4. The receiving side monitor 44 monitors the optical level of the optical receiving signal in the optical switch unit 4.

The optical transmission / reception unit 5 is connected to the optical switch unit 4 by an optical fiber. Further, the optical transmission / reception unit 5 has a transmission side monitor 51 and a reception side monitor 52. The transmission side monitor 51 monitors the optical level of the optical transmission signal in the optical transmission / reception unit 5. The reception side monitor 52 monitors the optical level of the optical reception signal in the optical transmission / reception unit 5. The optical transmission / reception unit 5 has a function of monitoring the optical level of only the same wavelength as the optical transmission signal.

From the above, the optical transmission device according to the first embodiment is a WDM device having optical couplers 31 and 32 in the optical multiplexing / demultiplexing unit 3. Further, in the optical transmission device according to the present embodiment, a double optical fiber in which the transmitting side and the receiving side are integrated is used. Therefore, if there is an error in the connection of the optical fiber, the transmitting side and the receiving side become abnormal at the same time.

The wavelength selection switches 21 and 22, the OCM23, the optical switches 41 and 42, and the optical transmission / reception unit 5 can set one channel for the non-service wavelength, which is a wavelength other than the service wavelength, and allow the non-service wavelength to pass through. Suppose that Here, the service wavelength refers to a wavelength used by an optical transmission device when providing a service such as telephone or data communication to a user.

<Operation>
FIG. 2 is a flowchart showing an example of the operation of the optical transmission device according to the first embodiment, and shows an operation of confirming whether or not the optical fiber is normally connected. It is assumed that the operation other than step S101 in FIG. 2 is performed by a control unit (not shown).

In step S101, each part is connected by an optical fiber.

In step S102, an unused wavelength common to all directions is searched for. If there is an unused wavelength, the process proceeds to step S103. On the other hand, if there is no unused wavelength, the process proceeds to step S104.

In step S103, the wavelength of the optical transmission / reception unit 5 is set to an unused wavelength.

In step S104, the wavelength of the optical transmission / reception unit 5 is set to the wavelength outside the service.

In step S105, the direction to which the optical switch 41 is connected is set. Initially, the youngest of the multiple numbered routes is set.

In step S106, it is determined whether or not the optical switch unit 4 corresponding to the set direction and the optical junction demultiplexing unit 3 are connected. When the optical switch section 4 and the optical junction demultiplexing section 3 are connected, the process proceeds to step S107. On the other hand, if the optical switch unit 4 and the optical demultiplexing unit 3 are not connected, the process proceeds to step S113.

In step S107, among the connection ports of the wavelength selection switch 21 of the OXC unit 2 corresponding to the set direction, the connection port connected to the optical demultiplexing unit 3 corresponding to the set direction is set. Set the wavelength to pass.

In step S108, the OCM23 of the OXC unit 2 determines whether or not a channel having a set wavelength exists. If the channel having the set wavelength does not exist, the process proceeds to step S109. On the other hand, if a channel having a set wavelength exists, the process proceeds to step S110.

In step S109, it is determined that there is an error in the optical fiber connection. After that, the process proceeds to step S201 of FIG. 3, which will be described later.

In step S110, it is determined that the optical fiber is normally connected.

In step S111, it is determined whether or not the optical fiber connection is confirmed for all the directions. When the optical fiber connection is confirmed for all directions, the operation shown in FIG. 2 is terminated. On the other hand, if the optical fiber connection is not confirmed for all the directions, the process proceeds to step S112.

In step S112, the connection destination of the optical switch 41 is set to the next direction. Then, the process returns to step S106.

If it is determined in step S106 that the optical switch unit 4 and the optical demultiplexing unit 3 are not connected, in step S113, among the connection ports of the wavelength selection switch 21 of the OXC unit 2 corresponding to all directions, among the connection ports of the wavelength selection switch 21 of the OXC unit 2. Set so that the set wavelength passes through the youngest connection port.

In step S114, the OCM23 of the OXC unit 2 corresponding to all the directions determines whether or not there is a channel having a wavelength set in at least one direction. If there is a channel having a wavelength set in at least one direction, the process proceeds to step S120. On the other hand, if the channels having the wavelengths set in all the directions do not exist, the process proceeds to step S115.

In step S115, it is determined that the optical fiber is normally connected.

In step S116, it is determined whether or not the optical fiber connection has been confirmed for all the connection ports of the wavelength selection switch 21. If the optical fiber connection has not been confirmed for all the connection ports, the process proceeds to step S117. On the other hand, when the optical fiber connection is confirmed for all the connection ports, the process proceeds to step S118.

In step S117, among the connection ports of the wavelength selection switch 21 of the OXC unit 2 corresponding to all directions, the next connection port is set so that the set wavelength passes through. Then, the process returns to step S114.

In step S118, it is determined whether or not the optical fiber connection has been confirmed for all directions. When the optical fiber connection is confirmed for all directions, the operation shown in FIG. 2 is terminated. On the other hand, if the optical fiber connection is not confirmed for all the directions, the process proceeds to step S119.

In step S119, the connection destination of the optical switch 41 is set to the next direction. Then, the process returns to step S106.

If it is determined in step S114 that a channel having a wavelength set in at least one direction exists, it is determined in step S120 that there is an error in the optical fiber connection. After that, the process proceeds to step S301 of FIG. 4, which will be described later.

By performing the operation shown in FIG. 2, it is possible to confirm whether the optical fibers are normally connected in all directions.

FIG. 3 is a flowchart showing an example of the operation of the optical transmission device according to the first embodiment, and shows an operation of identifying a portion where the optical fiber connection is incorrect. It is assumed that the operation of FIG. 3 is performed by a control unit (not shown).

If it is determined in step S109 of FIG. 2 that there is an error in the connection of the optical fiber, in step S201, the transmission side monitor 43 of the optical switch unit 4 monitors the optical level, so that the optical switch unit 4 transmits optical light. Determine if there is a signal input. If there is no input of the optical transmission signal in the optical switch unit 4, the process proceeds to step S202. On the other hand, if there is an input of an optical transmission signal in the optical switch unit 4, the process proceeds to step S203.

In step S202, it is determined that there is an error in the connection of the optical fiber between the optical transmission / reception unit 5 and the optical switch unit 4.

In step S203, the transmitting side monitor 33 of the optical junction demultiplexing unit 3 corresponding to the set direction monitors the optical level, so that the optical junction demultiplexing unit 3 corresponding to the set direction is combined with another optical transmission / reception unit 5. Determines if there is an optical transmission signal input from. If there is an input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S204. On the other hand, if there is no input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S205.

In step S204, since it has been confirmed that the connection of the optical fiber between the optical junction demultiplexing section 3 and the OXC section 2 is normal in the operation of FIG. 2, the optical fiber between the optical switch section 4 and the optical junction demultiplexing section 3 Judge that there is an error in the connection.

In step S205, the transmitting side monitor 33 of the optical wave demultiplexing unit 3 corresponding to the set direction monitors the optical level, so that the optical transmission signal is input to the optical wave wave dividing unit 3 corresponding to the set direction. Judge whether or not. If there is an optical transmission signal input in the optical demultiplexing unit 3 corresponding to the set direction, the process proceeds to step S206. On the other hand, if there is no input of the optical transmission signal in the optical combined demultiplexing unit 3 corresponding to the set direction, the process proceeds to step S207.

In step S206, it is determined that there is an error in the connection of the optical fiber between the OXC unit 2 and the optical wave demultiplexing unit 3.

In step S207, it is determined that there is an error in the connection of the optical fiber between the optical switch section 4 and the optical junction demultiplexing section 3.

FIG. 4 is a flowchart showing an example of the operation of the optical transmission device according to the first embodiment, and shows an operation of identifying a portion where the optical fiber connection is incorrect. It is assumed that the operation of FIG. 4 is performed by a control unit (not shown).

If it is determined in step S120 of FIG. 2 that there is an error in the connection of the optical fiber, in step S301, the transmission side monitor 43 of the optical switch unit 4 monitors the optical level, so that the optical switch unit 4 transmits optical light. Determine if there is a signal input. If there is no input of the optical transmission signal in the optical switch unit 4, the process proceeds to step S302. On the other hand, if there is an input of an optical transmission signal in the optical switch unit 4, the process proceeds to step S303.

In step S302, it is determined that there is an error in the connection of the optical fiber between the optical transmission / reception unit 5 and the optical switch unit 4.

In step S303, the transmission side monitor 33 of the optical junction demultiplexing unit 3 connected to the connection port of the set wavelength selection switch 21 monitors the optical level to connect to the connection port of the set wavelength selection switch 21. It is determined whether or not there is an optical transmission signal input from another optical transmission / reception unit 5 in the optical combined / demultiplexing unit 3. If there is an input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S304. On the other hand, if there is no input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S305.

In step S304, since it has been confirmed that the connection of the optical fiber between the optical junction demultiplexing section 3 and the OXC section 2 is normal in the operation of FIG. 2, the optical fiber between the optical switch section 4 and the optical junction demultiplexing section 3 Judge that there is an error in the connection.

In step S305, the transmission side monitor 33 of the optical junction demultiplexing unit 3 connected to the connection port of the set wavelength selection switch 21 monitors the optical level to connect to the connection port of the set wavelength selection switch 21. It is determined whether or not there is an optical transmission signal input in the optical combined demultiplexing unit 3. If there is an optical transmission signal input in the optical demultiplexing unit 3 connected to the connection port of the set wavelength selection switch 21, the process proceeds to step S306. On the other hand, if there is no input of the optical transmission signal in the optical demultiplexing unit 3 connected to the connection port of the set wavelength selection switch 21, the process proceeds to step S307.

In step S306, it is determined that there is an error in the connection of the optical fiber between the OXC unit 2 and the optical wave demultiplexing unit 3.

In step S307, it is determined that there is an error in the connection of the optical fiber between the optical switch section 4 and the optical junction demultiplexing section 3.

By performing the operations of FIGS. 3 and 4, it is possible to identify the location where the optical fiber connection is incorrect.

From the above, according to the first embodiment, it is possible to confirm whether or not the optical fiber is normally connected in the WDM device having the CDC function and the optical coupler. Further, when the optical fiber is not connected normally, it is possible to identify the place where the optical fiber connection is incorrect.

<Embodiment 2>
<Structure>
FIG. 5 is a block diagram showing an example of the configuration of the optical transmission device according to the second embodiment of the present invention.

As shown in FIG. 5, the optical transmission device according to the second embodiment has a transmission side WDM filter 13 in which the optical amplification unit 1 is a first filter unit, and a reception side WDM filter 14 in which the optical amplification unit 1 is a second filter unit. It is characterized by doing. Since other configurations are the same as those in the first embodiment, detailed description thereof will be omitted here.

The optical amplification unit 1 has a transmission side WDM filter 13 and a reception side WDM filter 14. When the wavelength of the optical transmission / reception unit 5 is set to the out-of-service wavelength, the transmission side WDM filter 13 inputs the optical transmission signal of the out-of-service wavelength to the reception side WDM filter 14 without outputting it to the outside of the optical amplification unit. The receiving side WDM filter 14 adds an optical signal having an out-of-service wavelength input from the transmitting side WDM filter 13 to the optical receiving signal.

<Operation>
FIG. 6 is a flowchart showing an example of the operation of the optical transmission device according to the second embodiment, and shows an operation of confirming whether or not the optical fiber is normally connected. It is assumed that the operation other than step S401 in FIG. 6 is performed by a control unit (not shown). Further, step S401 in FIG. 6 corresponds to step S101 in FIG. 2, steps S403 to S406 in FIG. 6 correspond to steps S105 to S108 in FIG. 2, and steps S411 to S419 in FIG. 6 correspond to step S411 in FIG. Corresponds to steps S111 to S119. Hereinafter, step S402, steps S407 to S410, and step S420 will be described.

In step S402, the wavelength of the optical transmission / reception unit 5 is set to the wavelength outside the service.

If it is determined in step S406 that a channel having a wavelength outside the service does not exist, it is determined in step S407 that there is an error in the optical fiber connection on the transmitting side. After that, the process proceeds to step S201 of FIG.

When it is determined in step S406 that a channel having an out-of-service wavelength exists, in step S408, the receiving side monitor 52 of the optical transmission / reception unit 5 monitors the optical level, so that the optical transmission / reception unit 5 monitors the out-of-service wavelength. It is determined whether or not the optical reception signal of is received. If the optical transmission / reception unit 5 has not received an optical reception signal having a wavelength outside the service, the process proceeds to step S409. On the other hand, when the optical transmission / reception unit 5 receives an optical reception signal having a wavelength outside the service, the process proceeds to step S410.

In step S409, it is determined that there is an error in the optical fiber connection on the receiving side. After that, the process proceeds to step S501 of FIG. 7, which will be described later.

When it is determined in step S408 that the optical transmission / reception unit 5 has received an optical reception signal having a wavelength outside the service, it is determined in step S410 that the optical fiber on the receiving side is normally connected.

If it is determined in step S414 that a channel having a wavelength set in at least one direction exists, it is determined in step S420 that there is an error in the optical fiber connection on the transmitting side. After that, the process proceeds to step S301 in FIG.

By performing the operation of FIG. 6, it is possible to confirm whether or not the optical fibers are normally connected in all directions by distinguishing between the transmitting side and the receiving side.

FIG. 7 is a flowchart showing an example of the operation of the optical transmission device according to the second embodiment, and shows an operation of identifying a portion where the optical fiber connection is incorrect. It is assumed that the operation of FIG. 7 is performed by a control unit (not shown).

If it is determined in step S409 of FIG. 6 that there is an error in the connection of the optical fiber on the receiving side, in step S501, the receiving side monitor 52 of the optical transmitting / receiving unit 5 monitors the optical level, whereby the optical transmitting / receiving unit 5 It is determined whether or not there is an optical reception signal input. If there is an optical reception signal input in the optical transmission / reception unit 5, the process proceeds to step S502. On the other hand, if there is no input of the optical reception signal in the optical transmission / reception unit 5, the process proceeds to step S512.

In step S502, the optical switch setting of the optical switch unit 4 is set to "no connection".

In step S503, the receiving side monitor 52 of the optical transmitting / receiving unit 5 monitors the optical level to determine whether or not there is an optical reception signal input in the optical transmitting / receiving unit 5. If there is an optical reception signal input in the optical transmission / reception unit 5, the process proceeds to step S504. On the other hand, if there is no input of the optical reception signal in the optical transmission / reception unit 5, the process proceeds to step S505.

In step S504, it is determined that there is an error in the connection of the optical fiber between the optical transmission / reception unit 5 and the optical switch unit 4.

In step S505, the transmitting side monitor 33 of the optical junction demultiplexing unit 3 corresponding to the set direction monitors the optical level, so that the optical junction demultiplexing unit 3 corresponding to the set direction is combined with another optical transmission / reception unit 5. Determines if there is an optical transmission signal input from. If there is an input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S511. On the other hand, if there is no input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S506.

In step S506, the receiving side monitor 12 of the optical amplification unit 1 monitors the optical level to determine whether or not there is an input of an optical reception signal in the optical amplification unit 1. If there is an optical reception signal input in the optical amplification unit 1, the process proceeds to step S507. On the other hand, if there is no input of the optical reception signal in the optical amplification unit 1, the process proceeds to step S508.

In step S507, the receiving side monitor 24 of the OXC unit 2 monitors the optical level to determine whether or not there is an optical reception signal input in the OXC unit 2. If there is an optical reception signal input in the OXC unit 2, the process proceeds to step S509. On the other hand, if there is no optical reception signal input in the OXC unit 2, the process proceeds to step S508.

In step S508, it is determined that there is an error in the connection of the optical fiber between the optical amplification unit 1 and the OXC unit 2.

In step S509, the receiving side monitor 34 of the optical demultiplexing unit 3 monitors the optical level to determine whether or not there is an optical reception signal input in the optical demultiplexing unit 3. If there is no optical reception signal input in the optical demultiplexing unit 3, the process proceeds to step S510. On the other hand, if there is an optical reception signal input in the optical demultiplexing unit 3, the process proceeds to step S511.

In step S510, it is determined that there is an error in the connection of the optical fiber between the OXC unit 2 and the optical wave demultiplexing unit 3.

In step S511, since it has been confirmed that the connection of the optical fiber between the optical junction demultiplexing section 3 and the OXC section 2 is normal in the operation of FIG. 6, the optical fiber between the optical switch section 4 and the optical junction demultiplexing section 3 Judge that there is an error in the connection.

In step S512, the transmitting side monitor 33 of the optical junction demultiplexing unit 3 corresponding to the set direction monitors the optical level, so that the optical junction demultiplexing unit 3 corresponding to the set direction is connected to another optical transmission / reception unit 5 Determines if there is an optical transmission signal input from. If there is an input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S513. On the other hand, if there is no input of an optical transmission signal from another optical transmission / reception unit 5, the process proceeds to step S514.

In step S513, the receiving side monitor 44 of the optical switch unit 4 monitors the optical level to determine whether or not there is an optical reception signal input in the optical switch unit 4. If there is no input of the optical reception signal in the optical switch unit 4, the process proceeds to step S511. On the other hand, if there is an input of an optical reception signal in the optical switch unit 4, the process proceeds to step S520.

In step S514, the receiving side monitor 12 of the optical amplification unit 1 monitors the optical level to determine whether or not there is an input of an optical reception signal in the optical amplification unit 1. If there is an optical reception signal input in the optical amplification unit 1, the process proceeds to step S515. On the other hand, if there is no input of the optical reception signal in the optical amplification unit 1, the process proceeds to step S516.

In step S515, the receiving side monitor 24 of the OXC unit 2 monitors the optical level to determine whether or not there is an optical reception signal input in the OXC unit 2. If there is no optical reception signal input in the OXC unit 2, the process proceeds to step S516. On the other hand, if there is an optical reception signal input in the OXC unit 2, the process proceeds to step S517.

In step S516, it is determined that there is an error in the connection of the optical fiber between the optical amplification unit 1 and the OXC unit 2.

In step S517, the receiving side monitor 34 of the optical demultiplexing unit 3 monitors the optical level to determine whether or not there is an optical reception signal input in the optical demultiplexing unit 3. If there is no optical reception signal input in the optical demultiplexing unit 3, the process proceeds to step S518. On the other hand, if there is an optical reception signal input in the optical demultiplexing unit 3, the process proceeds to step S519.

In step S518, it is determined that there is an error in the connection of the optical fiber between the OXC unit 2 and the optical wave demultiplexing unit 3.

In step S519, the receiving side monitor 44 of the optical switch unit 4 monitors the optical level to determine whether or not there is an optical reception signal input in the optical switch unit 4. If there is an optical reception signal input in the optical switch unit 4, the process proceeds to step S520. On the other hand, if there is no input of the optical reception signal in the optical switch unit 4, the process proceeds to step S521.

In step S520, it is determined that there is an error in the connection of the optical fiber between the optical transmission / reception unit 5 and the optical switch unit 4.

In step S521, it is determined that there is an error in the connection of the optical fiber between the optical switch section 4 and the optical junction demultiplexing section 3.

By performing the operation shown in FIG. 7, it is possible to identify a location where the optical fiber connection is incorrect on the receiving side.

From the above, according to the second embodiment, in the WDM device having the CDC function and the optical coupler, it is confirmed whether or not the optical fiber is normally connected by distinguishing between the transmitting side and the receiving side. be able to. Further, when the optical fiber is not connected normally, it is possible to identify the place where the optical fiber connection is incorrect.

In the present invention, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the invention.

1 Optical amplification unit, 2 OXC unit, 3 Optical division multiplexing unit, 4 Optical switch unit, 5 Optical transmission / reception unit, 11 Transmitter monitor, 12 Receiver monitor, 13 Transmitter WDM filter, 14 Receiver WDM filter, 21, 22 Wavelength selection switch, 23 OCM, 24 Receiver monitor, 31, 32 Optical coupler, 33 Transmitter monitor, 34 Receiver monitor, 35 Wavelength selection switch, 41, 42 Optical switch, 43 Transmitter monitor, 44 Receiver monitor, 51 Transmitter monitor, 52 receiver monitor.

Claims (28)

The optical amplification unit, the OXC (Optical Cross Connect) unit connected to the optical amplification unit by an optical fiber, the optical demultiplexing unit connected to the OXC unit by an optical fiber, and the optical demultiplexing unit and an optical fiber. Connection of an optical fiber in an optical transmission device capable of transmitting and receiving optical signals in multiple paths, including a connected optical switch unit, an optical transmission / reception unit connected to the optical switch unit by an optical fiber, and an optical coupler. It ’s a confirmation method,
The wavelength of the optical signal transmitted / received by the optical transmission / reception unit is set to an unused wavelength or a wavelength outside the service preset so that the OXC unit, the optical switch unit, and the optical transmission / reception unit can be used.
The connection of the optical fiber in the optical transmission device is confirmed using the unused wavelength or the wavelength outside the service .
The optical switch unit corresponding to the predetermined direction and the optical demultiplexing unit are connected by the optical fiber, and the OXC unit corresponding to the predetermined direction is the unused wavelength or the service. When the optical signal of the outer wavelength is not detected, it is determined that there is an error in the connection of the optical fiber in the predetermined direction, and it is determined.
Each of the optical amplification unit, the OXC unit, the optical demultiplexing unit, the optical switch unit, and the optical transmission / reception unit has a monitor for detecting the optical level of the optical signal. How to check the connection of the optical fiber in. When the optical switch unit does not detect the optical signal of the unused wavelength or the out-of-service wavelength, it is characterized in that it is determined that there is an error in the connection of the optical fiber between the optical switch unit and the optical transmission / reception unit. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 1 . The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and the optical signal is transmitted from another optical transmission / reception unit to the optical duplexing unit corresponding to the predetermined direction. The connection confirmation of the optical fiber in the optical transmission device according to claim 1 , wherein when there is an input, it is determined that there is an error in the connection of the optical fiber between the optical demultiplexing unit and the optical switch unit. Method. The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and inputs the optical signal to the optical junction demultiplexing unit corresponding to the predetermined direction from another optical transmission / reception unit. If there is no light and the optical demultiplexer does not detect the optical signal of the unused wavelength or the out-of-service wavelength, there is an error in the connection of the optical fiber between the optical demultiplexer and the optical switch. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 1 , wherein it is determined that there is. The optical switch unit detects the optical signal having the unused wavelength or the wavelength outside the service, and inputs the optical signal to the optical junction demultiplexing unit corresponding to the predetermined direction from another optical transmission / reception unit. If there is no light and the optical demultiplexing unit detects the optical signal of the unused wavelength or the out-of-service wavelength, it is determined that there is an error in the connection of the optical fiber between the optical demultiplexing unit and the OXC unit . The method for confirming the connection of an optical fiber in the optical transmission device according to claim 1 , wherein the method is to be performed. The optical amplification unit, the OXC (Optical Cross Connect) unit connected to the optical amplification unit by an optical fiber, the optical demultiplexing unit connected to the OXC unit by an optical fiber, and the optical demultiplexing unit and an optical fiber. Connection of an optical fiber in an optical transmission device capable of transmitting and receiving optical signals in multiple paths, including a connected optical switch unit, an optical transmission / reception unit connected to the optical switch unit by an optical fiber, and an optical coupler. It ’s a confirmation method,
The wavelength of the optical signal transmitted / received by the optical transmission / reception unit is set to an unused wavelength or a wavelength outside the service preset so that the OXC unit, the optical switch unit, and the optical transmission / reception unit can be used.
The connection of the optical fiber in the optical transmission device is confirmed using the unused wavelength or the wavelength outside the service .
The optical switch unit corresponding to a predetermined direction and the optical demultiplexing unit are not connected by the optical fiber, and the OXC unit corresponding to any one of all the directions is When the optical signal having the unused wavelength or the wavelength outside the service is detected, it is determined that there is an error in the connection of the optical fiber in the predetermined direction.
Each of the optical amplification unit, the OXC unit, the optical demultiplexing unit, the optical switch unit, and the optical transmission / reception unit has a monitor for detecting the optical level of the optical signal. How to check the connection of the optical fiber in. When the optical switch unit does not detect the optical signal of the unused wavelength or the out-of-service wavelength, it is characterized in that it is determined that there is an error in the connection of the optical fiber between the optical switch unit and the optical transmission / reception unit. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 6 . The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and is connected to the predetermined connection port of the wavelength selection switch of the OXC unit to the optical demultiplexing unit. The sixth aspect of claim 6 is characterized in that when the optical signal is input from another optical transmission / reception unit, it is determined that there is an error in the connection of the optical fiber between the optical junction demultiplexing unit and the optical switch unit. The method for confirming the connection of an optical fiber in the optical transmission device described. In the optical demultiplexing section where the optical switch section detects the optical signal of the unused wavelength or the out-of-service wavelength and is connected to a predetermined connection port of the wavelength selection switch of the OXC section, etc. When there is no input of the optical signal from the optical transmission / reception unit and the optical junction / demultiplexing unit connected to the connection port does not detect the optical signal of the unused wavelength or the out-of-service wavelength, the said. The method for confirming the connection of an optical fiber in an optical transmission device according to claim 6 , wherein it is determined that there is an error in the connection of the optical fiber between the optical duplexing unit and the optical switch unit. The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and is connected to the predetermined connection port of the wavelength selection switch of the OXC unit. When the optical signal is not input from the optical transmission / reception unit and the optical junction / demultiplexing unit connected to the connection port detects the optical signal having the unused wavelength or the out-of-service wavelength, the OXC unit. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 6 , wherein it is determined that there is an error in the connection of the optical fiber between the optical junction demultiplexing portions. The optical amplification unit, the OXC (Optical Cross Connect) unit connected to the optical amplification unit by an optical fiber, the optical demultiplexing unit connected to the OXC unit by an optical fiber, and the optical demultiplexing unit and an optical fiber. Connection of an optical fiber in an optical transmission device capable of transmitting and receiving optical signals in multiple paths, including a connected optical switch unit, an optical transmission / reception unit connected to the optical switch unit by an optical fiber, and an optical coupler. It ’s a confirmation method,
The wavelength of the optical signal transmitted / received by the optical transmission / reception unit is set to an unused wavelength or a wavelength outside the service preset so that the OXC unit, the optical switch unit, and the optical transmission / reception unit can be used.
The connection of the optical fiber in the optical transmission device is confirmed using the unused wavelength or the wavelength outside the service .
The optical amplification unit receives the first filter unit that filters the optical transmission signal, which is the optical signal transmitted at the wavelength outside the service, and the optical transmission signal filtered by the first filter unit as an optical reception signal. It is equipped with a second filter unit to be used.
Each of the optical amplification unit, the OXC unit, the optical demultiplexing unit, the optical switch unit, and the optical transmission / reception unit has a monitor for detecting the optical level of the optical signal. How to check the connection of the optical fiber in. The optical switch unit corresponding to the predetermined direction and the optical demultiplexing unit are connected by the optical fiber, and the OXC unit corresponding to the predetermined direction does not detect the optical transmission signal. In this case, the method for confirming the connection of an optical fiber in an optical transmission device according to claim 11 , wherein it is determined that there is an error in the connection of the optical fiber on the transmitting side of the predetermined direction. The optical switch unit corresponding to the predetermined direction and the optical demultiplexing unit are connected by the optical fiber, and the OXC unit corresponding to the predetermined direction detects the optical transmission signal. The eleventh aspect of the present invention is characterized in that when the optical transmission / reception unit does not detect the optical reception signal, it is determined that there is an error in the connection of the optical fiber on the reception side of the predetermined direction. The method for confirming the connection of an optical fiber in the above-described optical transmission device. The optical switch unit corresponding to a predetermined route and the optical demultiplexing unit are not connected by the optical fiber, and the OXC unit corresponding to any one of all the routes is The connection confirmation of the optical fiber in the optical transmission device according to claim 11 , wherein when the optical transmission signal is detected, it is determined that there is an error in the connection of the optical fiber in the predetermined direction. Method. When the optical switch setting of the optical switch unit is set to no connection and the optical transmission / reception unit detects the optical reception signal, there is an error in the connection of the optical fiber between the optical switch unit and the optical transmission / reception unit. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 13 , wherein the method is determined to be. The optical transmission / reception unit detects the optical reception signal, the optical signal demultiplexing unit corresponding to the predetermined direction has no input of the optical transmission signal from another optical transmission / reception unit, and the optical amplification unit. 13. The light in the optical transmission device according to claim 13 , wherein when the light reception signal is not detected, it is determined that there is an error in the connection of the optical fiber between the optical amplification unit and the OXC. How to check the fiber connection. The optical transmission / reception unit detects the optical reception signal, and there is no input of the optical transmission signal from the other optical transmission / reception unit to the optical junction demultiplexing unit corresponding to the predetermined direction, and the optical amplification unit causes the optical amplification unit. When the optical reception signal is detected and the OXC unit does not detect the optical reception signal, it is determined that there is an error in the connection of the optical fiber between the optical amplification unit and the OXC. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 13 . The optical transmission / reception unit detects the optical reception signal, and there is no input of the optical transmission signal from the other optical transmission / reception unit to the optical junction demultiplexing unit corresponding to the predetermined direction, and the optical amplification unit causes the optical amplification unit. When the optical reception signal is detected, the OXC unit detects the optical reception signal, and the optical reception demultiplexing unit does not detect the optical reception signal, the light between the OXC and the optical demultiplexing unit The method for confirming the connection of an optical fiber in the optical transmission device according to claim 13 , wherein it is determined that there is an error in the connection of the fiber. The optical transmission / reception unit detects the optical reception signal, and the optical transmission / reception unit does not input the optical transmission signal from another optical transmission / reception unit to the optical junction demultiplexing unit corresponding to the predetermined direction, and the optical amplification unit causes the optical amplification unit. When the optical reception signal is detected, the OXC unit detects the optical reception signal, and the optical demultiplexing unit detects the optical reception signal, the light between the optical demultiplexing unit and the optical switch unit. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 13 , wherein it is determined that there is an error in the connection of the fiber. When the optical transmission / reception unit detects the optical reception signal and the optical transmission / reception unit receives an input of the optical transmission signal from another optical transmission / reception unit in the optical reception / demultiplexing unit corresponding to the predetermined direction, the optical transmission / reception unit receives the optical transmission signal. The method for confirming the connection of an optical fiber in an optical transmission device according to claim 13 , wherein it is determined that there is an error in the connection of the optical fiber between the wave unit and the optical switch unit. The optical transmission / reception unit does not detect the optical reception signal, the optical junction / demultiplexing unit corresponding to the predetermined direction has the optical transmission signal input from another optical transmission / reception unit, and the optical switch. 13. The light according to claim 13 , wherein when the unit does not detect the optical reception signal, it is determined that there is an error in the connection of the optical fiber between the optical demultiplexing unit and the optical switch unit. How to check the connection of optical fiber in a transmission device. The optical transmission / reception unit does not detect the optical reception signal, the optical junction / demultiplexing unit corresponding to the predetermined direction has the optical transmission signal input from another optical transmission / reception unit, and the optical switch. 13. The optical transmission device according to claim 13 , wherein when the unit detects the optical reception signal, it is determined that there is an error in the connection of the optical fiber between the optical switch unit and the optical transmission / reception unit. How to check the connection of optical fiber. The optical transmission / reception unit does not detect the optical reception signal, the optical junction / demultiplexing unit corresponding to the predetermined direction does not receive the optical transmission signal input from another optical transmission / reception unit, and the optical amplification unit. Detects the optical reception signal, the OXC unit detects the optical reception signal, the optical junction demultiplexing unit detects the optical reception signal, and the optical switch unit detects the optical reception signal. The method for confirming the connection of an optical fiber in an optical transmission device according to claim 13 , wherein it is determined that there is an error in the connection of the optical fiber between the optical switch unit and the optical transmission / reception unit. The optical transmission / reception unit does not detect the optical reception signal, the optical junction / demultiplexing unit corresponding to the predetermined direction does not receive the optical transmission signal input from another optical transmission / reception unit, and the optical amplification unit. Detected the optical reception signal, the OXC unit detected the optical reception signal, the optical demultiplexing unit detected the optical reception signal, and the optical switch unit did not detect the optical reception signal. In this case, the method for confirming the connection of an optical fiber in the optical transmission device according to claim 13 , wherein it is determined that there is an error in the connection of the optical fiber between the optical transmission / reception unit and the optical switch unit. The optical transmission / reception unit does not detect the optical reception signal, and there is no input of the optical transmission signal from the other optical transmission / reception unit to the optical junction demultiplexing unit corresponding to the predetermined direction, and the optical amplification unit. Detects the optical reception signal, the OXC unit detects the optical reception signal, and the optical reception demultiplexing unit does not detect the optical reception signal, between the OXC unit and the optical demultiplexing unit. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 13 , wherein it is determined that there is an error in the connection of the optical fiber. The optical transmission / reception unit does not detect the optical reception signal, and there is no input of the optical transmission signal from the other optical transmission / reception unit to the optical junction demultiplexing unit corresponding to the predetermined direction, and the optical amplification unit. Detects the optical reception signal, and when the OXC unit does not detect the optical reception signal, it is determined that there is an error in the connection of the optical fiber between the optical amplification unit and the OXC unit. The method for confirming the connection of an optical fiber in the optical transmission device according to claim 13 . The optical transmission / reception unit does not detect the optical reception signal, there is no input of the optical transmission signal from the other optical transmission / reception unit to the optical junction demultiplexing unit corresponding to the predetermined direction, and the optical amplification 13. The optical transmission device according to claim 13 , wherein when the unit does not detect the optical reception signal, it is determined that there is an error in the connection of the optical fiber between the optical amplification unit and the OXC unit. How to check the connection of the optical fiber in. The method for confirming the connection of an optical fiber in an optical transmission device according to any one of claims 1 to 27 , wherein the optical demultiplexing unit has the optical coupler.

Images