JP2019176297A - Connection confirmation method for optical fiber in optical transmission device - Google Patents

Abstract

An object of the present invention is to provide a method for confirming connection of an optical fiber in an optical transmission device capable of confirming whether the optical fiber is normally connected. A method for confirming connection of an optical fiber in an optical transmission device according to the present invention includes an optical amplifier, an optical cross connect (OXC) unit connected to the optical amplifier, and an OXC unit. An optical multiplexing / demultiplexing unit 3 connected by an optical fiber, an optical switch unit 4 connected to the optical multiplexing / demultiplexing unit 3 by an optical fiber, an optical transmitting / receiving unit 5 connected to the optical switch unit 4 by an optical fiber, and an optical coupler A method for confirming the connection of an optical fiber in an optical transmission device capable of transmitting and receiving optical signals to and from a multi-way, wherein the wavelength of the optical signal transmitted and received by the optical transmitting and receiving unit 5 is set to an unused wavelength or an OXC unit. , The optical switch unit and the optical transmitting / receiving unit are set to useable out-of-service wavelengths, and the connection of the optical fiber in the optical transmission device is confirmed using the unused wavelength or out-of-service wavelength. [Selection diagram] Fig. 1

Description

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

  Conventionally, there are a large number of optical fibers provided in a WDM apparatus connected to multiple paths, and there is a problem that connection errors are likely to occur. In addition, due to the spread of wavelength-independent functions, errors in optical fiber connection within the WDM apparatus are more likely to occur. As a countermeasure against such a problem, a WDM apparatus including a wavelength selective switch has been disclosed (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2006-144013

  In Patent Document 1, the main signal is not affected even if the optical fiber is connected by mistake. On the other hand, in the WDM apparatus having a wavelength-independent function, a configuration in which some wavelength selective switches are replaced with optical couplers is increasing for the purpose of cost reduction. In a configuration in which the wavelength selective switch is replaced with an optical coupler, the main signal may be lost if the optical fiber is incorrectly connected. Therefore, in a configuration in which the wavelength selective switch is replaced with an optical coupler, it is important to check whether the optical fiber is connected normally, but conventionally it is possible to check whether the optical fiber is connected normally. There wasn't.

  The present invention has been made to solve such a problem, and provides an optical fiber connection confirmation method in an optical transmission apparatus capable of confirming whether an optical fiber is normally connected. Objective.

  In order to solve the above problems, an optical fiber connection confirmation method in an optical transmission apparatus according to the present invention includes an optical amplification unit, an OXC (Optical Cross Connect) unit connected to the optical amplification unit and the optical fiber, and an OXC unit. And an optical multiplexer / demultiplexer connected by an optical fiber, an optical switch connected by the optical multiplexer / demultiplexer and the optical fiber, an optical transceiver connected by the optical switch and the optical fiber, and an optical coupler, An optical fiber connection confirmation method in an optical transmission apparatus capable of transmitting and receiving optical signals in multiple directions, wherein the wavelength of the optical signal transmitted and received by the optical transceiver unit is an unused wavelength, or an OXC unit, an optical switch unit, In addition, the non-service wavelength set in advance that can be used by the optical transmitter / receiver is set, and the connection of the optical fiber in the optical transmission apparatus is confirmed using the unused wavelength or the non-service wavelength.

  According to the present invention, an optical fiber connection confirmation method in an optical transmission apparatus includes an optical amplifying unit, an OXC (Optical Cross Connect) unit connected to the optical amplifying unit by an optical fiber, and an OXC unit connected to the optical fiber by an optical fiber. An optical multiplexing / demultiplexing unit, an optical switch unit connected to the optical multiplexing / 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, and an optical coupler for transmitting / receiving optical signals. An optical fiber connection confirmation method in an optical transmission device that can be used, and the wavelength of an optical signal transmitted / received by an optical transmission / reception unit can be used as an unused wavelength or an OXC unit, an optical switch unit, and an optical transmission / reception unit In order to check the connection of the optical fiber in the optical transmission equipment using the unused wavelength or the non-service wavelength set in advance, check whether the optical fiber is connected normally Rukoto is possible.

It is a block diagram which shows an example of a structure of the optical transmission apparatus by Embodiment 1 of this invention. 5 is a flowchart illustrating an example of the operation of the optical transmission apparatus according to the first embodiment of the present invention. 5 is a flowchart illustrating an example of the operation of the optical transmission apparatus according to the first embodiment of the present invention. 5 is a flowchart illustrating an example of the operation of the optical transmission apparatus according to the first embodiment of the present invention. It is a block diagram which shows an example of a structure of the optical transmission apparatus by Embodiment 2 of this invention. 6 is a flowchart illustrating an example of an operation of the optical transmission apparatus according to the second embodiment of the present invention. 6 is a flowchart illustrating an example of an operation of the optical transmission apparatus according to the second embodiment of the present invention. It is a block diagram which shows an example of a structure of the optical transmission apparatus by a base technology. It is a block diagram which shows an example of a structure of the optical transmission apparatus by a base technology.

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

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

  FIG. 8 is a block diagram illustrating an example of the configuration of the optical transmission apparatus according to the base technology.

  As shown in FIG. 8, the optical transmission device according to the base technology includes an optical amplification unit 1, an OXC (Optical Cross Connect) unit 2, an optical multiplexing / demultiplexing unit 3, an optical switch unit 4, and an optical transmission / reception unit 5. Each part is connected with an optical fiber. The OXC unit 2 includes a wavelength selective switch 21 and an OCM (Optical Channel Monitor) 23. The optical multiplexing / demultiplexing unit 3 includes a wavelength selective switch 35. The optical switch unit 4 has an optical switch 41. The optical transceiver 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 multiplexing / demultiplexing unit 3 is incorrect, the optical signal input / output to / from each port of the optical multiplexing / demultiplexing unit 3 by the wavelength selection switch 35 is performed. It is possible to select the wavelength. That is, even if the optical fiber is connected by mistake, the main signal is not affected.

  FIG. 9 is a block diagram illustrating an example of the configuration of the optical transmission apparatus according to the base technology.

  The optical transmission apparatus shown in FIG. 9 has a configuration in which the wavelength selective switch 35 of the optical multiplexing / demultiplexing unit 3 shown in FIG. Other configurations are the same as those of the optical transmission apparatus shown in FIG.

  In the optical transmission apparatus shown in FIG. 9, when the optical fiber connection between the optical switch unit 4 and the optical multiplexing / demultiplexing unit 3 is incorrect, for example, depending on the wavelength of the optical signal transmitted from each optical transceiver unit 5, There is a possibility that the optical signal transmitted from the transmission / reception unit 5 collides 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 selective switch is replaced with an optical coupler.

  The present invention makes it possible to confirm whether an optical fiber is normally connected in an optical transmission device having an optical coupler. Details will be described below.

<Embodiment 1>
<Configuration>
FIG. 1 is a block diagram showing an example of the configuration of an optical transmission apparatus according to Embodiment 1 of the present invention.

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

  The number of optical amplifying units 1 is as many as the number of paths connected to the transmission device. The optical amplifying unit 1 includes 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 when transmitting, in the optical amplification unit 1. The reception-side monitor 12 monitors the optical level of the optical reception signal that is the received optical signal in the optical amplification unit 1.

  The OXC unit 2 is connected to the optical amplifying unit 1 through an optical fiber, and is provided as many as the number of paths connected to the transmission apparatus. The OXC unit 2 includes a wavelength selective switch 21, a wavelength selective switch 22, an OCM 23, and a reception side monitor 24. The wavelength selective switch 21 is provided on the transmission side, and can be set to pass or block an arbitrary wavelength with respect to the connection port with the optical multiplexing / demultiplexing unit 3. The wavelength selective switch 22 is provided on the reception side, and can be set to pass or block an arbitrary wavelength with respect to the connection port with the optical multiplexing / demultiplexing unit 3. The OCM 23 can monitor the optical level for each channel input from each connection port of the wavelength selective switch 21. The reception side monitor 24 monitors the optical level of the optical reception signal in the OXC unit 2.

  The optical multiplexing / demultiplexing unit 3 is connected to the OXC unit 2 through an optical fiber, and a plurality of optical multiplexing / demultiplexing units 3 are provided for each path connected to the transmission apparatus. The optical multiplexing / demultiplexing unit 3 includes an optical coupler 31, an optical coupler 32, a transmission side monitor 33, and a reception side monitor 34. The optical coupler 31 is provided on the transmission side and has a function of multiplexing optical transmission signals transmitted from the respective optical transmission / reception units 5. The optical coupler 32 is provided on the receiving side and has a function of demultiplexing an optical reception signal. The transmission side monitor 33 monitors the optical level of the optical transmission signal in the optical multiplexing / demultiplexing unit 3. The reception side monitor 34 monitors the optical level of the optical reception signal in the optical multiplexing / demultiplexing unit 3.

  The optical switch unit 4 is connected to the optical multiplexing / demultiplexing unit 3 through an optical fiber. The optical switch unit 4 includes an optical switch 41, an optical switch 42, a transmission side monitor 43, and a reception side monitor 44. The optical switch 41 is provided on the transmission side and has one output port for each route. The optical switch 42 is provided on the receiving side and has one input port for each path. The transmission side monitor 43 monitors the optical level of the optical transmission signal in the optical switch unit 4. The reception monitor 44 monitors the optical level of the optical reception signal in the optical switch unit 4.

  The optical transmission / reception unit 5 is connected to the optical switch unit 4 through an optical fiber. The optical transmitter / receiver 5 includes 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 transmitter / receiver 5 has a function of monitoring the optical level of only the same wavelength as the optical transmission signal.

  As described above, the optical transmission apparatus according to the first embodiment is a WDM apparatus having the optical couplers 31 and 32 in the optical multiplexing / demultiplexing unit 3. In addition, the optical transmission apparatus according to the present embodiment uses two series of optical fibers in which the transmission side and the reception side are integrated. Therefore, if there is an error in the optical fiber connection, the transmitting side and the receiving side become abnormal at the same time.

  The wavelength selective switches 21 and 22, the OCM 23, the optical switches 41 and 42, and the optical transmission / reception unit 5 can set one channel for a non-service wavelength that is a wavelength other than the service wavelength, and pass the non-service wavelength. Suppose that Here, the service wavelength refers to a wavelength used when the optical transmission apparatus provides a service such as telephone or data communication to the user.

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

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

  In step S102, an unused wavelength common to all routes is searched. 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 in the optical transceiver 5 is set to an unused wavelength.

  In step S104, the wavelength at the optical transceiver 5 is set to a non-service wavelength.

  In step S105, the route to which the optical switch 41 is connected is set. At first, the youngest route is set among a plurality of routes with numbers.

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

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

  In step S108, the OCM 23 of the OXC unit 2 determines whether a channel with the set wavelength exists. If there is no channel with the set wavelength, the process proceeds to step S109. On the other hand, if a channel having the 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. Thereafter, the process proceeds to step S201 in FIG.

  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 has been confirmed for all the routes. When the optical fiber connection is confirmed for all the routes, the operation in FIG. 2 is terminated. On the other hand, when the optical fiber connection is not confirmed for all the routes, the process proceeds to step S112.

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

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

  In step S114, the OCM 23 of the OXC unit 2 corresponding to all routes determines whether or not a channel having a wavelength set in at least one route exists. If there is a channel having a wavelength set in at least one route, the process proceeds to step S120. On the other hand, if there is no channel having the set wavelength in all the routes, 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 is confirmed for all the connection ports of the wavelength selective switch 21. When the connection of the optical fiber is not 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, setting is made so that the set wavelength passes through the next connection port among the connection ports of the wavelength selective switch 21 of the OXC unit 2 corresponding to all routes. Thereafter, the process returns to step S114.

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

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

  If it is determined in step S114 that there is a channel having a wavelength set in at least one route, it is determined in step S120 that there is an error in the optical fiber connection. Thereafter, the process proceeds to step S301 in FIG.

  By performing the operation of FIG. 2, it is possible to confirm whether or not the optical fibers are normally connected for all the routes.

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

  If it is determined in step S109 in FIG. 2 that there is an error in the optical fiber connection, 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 performs optical transmission. It is determined whether there is a signal input. If there is no optical transmission signal input in the optical switch unit 4, the process proceeds to step S202. On the other hand, if an optical transmission signal is input in the optical switch unit 4, the process proceeds to step S203.

  In step S <b> 202, it is determined that there is an error in the optical fiber connection between the optical transmission / reception unit 5 and the optical switch unit 4.

  In step S203, when the transmission side monitor 33 of the optical multiplexing / demultiplexing unit 3 corresponding to the set route monitors the optical level, the optical multiplexing / demultiplexing unit 3 corresponding to the set route is changed to another optical transmitting / receiving unit 5. It is determined whether there is an input of an optical transmission signal from. When 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, when 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 optical fiber connection between the optical multiplexing / demultiplexing unit 3 and the OXC unit 2 is normal in the operation of FIG. 2, the optical fiber between the optical switch unit 4 and the optical multiplexing / demultiplexing unit 3 is confirmed. It is determined that there is an error in the connection.

  In step S205, the transmission side monitor 33 of the optical multiplexing / demultiplexing unit 3 corresponding to the set route monitors the optical level, so that an optical transmission signal is input to the optical multiplexing / demultiplexing unit 3 corresponding to the set route. Determine whether or not. If there is an input of an optical transmission signal in the optical multiplexing / demultiplexing unit 3 corresponding to the set route, the process proceeds to step S206. On the other hand, when there is no optical transmission signal input in the optical multiplexing / demultiplexing unit 3 corresponding to the set route, the process proceeds to step S207.

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

  In step S207, it is determined that there is an error in the optical fiber connection between the optical switch unit 4 and the optical multiplexing / demultiplexing unit 3.

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

  If it is determined in step S120 in FIG. 2 that there is an error in the optical fiber connection, 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 performs optical transmission. It is determined whether there is a signal input. When there is no optical transmission signal input in the optical switch unit 4, the process proceeds to step S302. On the other hand, if an optical transmission signal is input in the optical switch unit 4, the process proceeds to step S303.

  In step S <b> 302, it is determined that there is an error in the optical fiber connection between the optical transmission / reception unit 5 and the optical switch unit 4.

  In step S303, the transmission side monitor 33 of the optical multiplexing / demultiplexing unit 3 connected to the connection port of the set wavelength selective switch 21 monitors the optical level, thereby connecting to the connection port of the set wavelength selective switch 21. It is determined whether or not the existing optical multiplexing / demultiplexing unit 3 has an optical transmission signal input from another optical transmitting / receiving unit 5. 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, when 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 optical fiber connection between the optical multiplexing / demultiplexing unit 3 and the OXC unit 2 is normal in the operation of FIG. 2, the optical fiber between the optical switch unit 4 and the optical multiplexing / demultiplexing unit 3 is confirmed. It is determined that there is an error in the connection.

  In step S305, the transmission side monitor 33 of the optical multiplexing / demultiplexing unit 3 connected to the connection port of the set wavelength selective switch 21 monitors the optical level, thereby connecting to the connection port of the set wavelength selective switch 21. It is determined whether or not there is an input of an optical transmission signal in the optical multiplexing / demultiplexing unit 3. When there is an optical transmission signal input in the optical multiplexing / demultiplexing unit 3 connected to the set connection port of the wavelength selective switch 21, the process proceeds to step S306. On the other hand, when there is no optical transmission signal input in the optical multiplexing / demultiplexing unit 3 connected to the set connection port of the wavelength selective switch 21, the process proceeds to step S307.

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

  In step S307, it is determined that there is an error in the optical fiber connection between the optical switch unit 4 and the optical multiplexing / demultiplexing unit 3.

  By performing the operations of FIGS. 3 and 4, it is possible to identify a 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 apparatus having the CDC function and including the optical coupler. Moreover, when the optical fiber is not normally connected, the location where the connection of the optical fiber is incorrect can be specified.

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

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

  The optical amplification unit 1 includes a transmission side WDM filter 13 and a reception side WDM filter 14. When the wavelength at the optical transmitter / receiver 5 is set to the non-service wavelength, the transmission-side WDM filter 13 inputs the optical transmission signal of the non-service wavelength to the reception-side WDM filter 14 without outputting it outside the optical amplification unit. The reception-side WDM filter 14 adds an optical signal with a non-service wavelength input from the transmission-side WDM filter 13 to the optical reception signal.

<Operation>
FIG. 6 is a flowchart showing an example of the operation of the optical transmission apparatus according to the second embodiment, and shows the operation of confirming whether the optical fiber is normally connected. Note that operations other than step S401 in FIG. 6 are performed by a control unit (not shown). 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. This corresponds to step S111 to step S119. Below, step S402, step S407-step S410, and step S420 are demonstrated.

  In step S402, the wavelength in the optical transmission / reception unit 5 is set to a non-service wavelength.

  If it is determined in step S406 that there is no channel with an out-of-service wavelength, it is determined in step S407 that there is an error in the optical fiber connection on the transmission side. Thereafter, the process proceeds to step S201 in FIG.

  If it is determined in step S406 that there is a channel with a wavelength outside the service, in step S408, the reception monitor 52 of the optical transceiver 5 monitors the optical level, so that the optical transceiver 5 It is determined whether or not an optical reception signal 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 has received an optical reception signal having a wavelength outside the service, the process proceeds to step S410.

  In step S409, the receiving side determines that there is an error in the optical fiber connection. Thereafter, the process proceeds to step S501 in FIG.

  If it is determined in step S408 that the optical transmitter / receiver 5 has received an optical reception signal having a wavelength outside the service, it is determined in step S410 that the receiving optical fiber is normally connected.

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

  By performing the operation of FIG. 6, it is possible to confirm whether the optical fiber is normally connected for all the routes by distinguishing between the transmission side and the reception side.

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

  If it is determined in step S409 in FIG. 6 that there is an error in the optical fiber connection on the reception side, the reception side monitor 52 of the optical transmission / reception unit 5 monitors the optical level in step S501. It is determined whether or not there is an input of an optical reception signal. When the optical transmission / reception unit 5 receives an optical reception signal, the process proceeds to step S502. On the other hand, when there is no optical reception signal input in the optical transceiver 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 S <b> 503, the reception monitor 52 of the optical transceiver 5 monitors the optical level to determine whether the optical transceiver 5 has received an optical reception signal. When the optical transmission / reception unit 5 receives an optical reception signal, the process proceeds to step S504. On the other hand, when there is no optical reception signal input 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 optical fiber connection between the optical transmitter / receiver 5 and the optical switch unit 4.

  In step S505, the transmission side monitor 33 of the optical multiplexing / demultiplexing unit 3 corresponding to the set path monitors the optical level, so that the optical multiplexing / demultiplexing unit 3 corresponding to the set path is replaced with another optical transmitting / receiving unit 5. It is determined whether there is an input of an optical transmission signal from. When 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, when 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 monitor 12 of the optical amplifying unit 1 monitors the optical level to determine whether the optical amplifying unit 1 has received an optical reception signal. If there is an input of an optical reception signal in the optical amplifier 1, the process proceeds to step S507. On the other hand, if no optical reception signal is input in the optical amplifying unit 1, the process proceeds to step S508.

  In step S507, the reception-side monitor 24 of the OXC unit 2 monitors the optical level, thereby determining whether or not an optical reception signal is input in the OXC unit 2. If an optical reception signal is input in the OXC unit 2, the process proceeds to step S509. On the other hand, when the optical reception signal is not 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 optical fiber connection between the optical amplifying unit 1 and the OXC unit 2.

  In step S509, the reception-side monitor 34 of the optical multiplexing / demultiplexing unit 3 monitors the optical level to determine whether the optical multiplexing / demultiplexing unit 3 has received an optical reception signal. If no optical reception signal is input in the optical multiplexing / demultiplexing unit 3, the process proceeds to step S510. On the other hand, when there is an input of an optical reception signal in the optical multiplexing / demultiplexing unit 3, the process proceeds to step S511.

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

  In step S511, since it is confirmed that the optical fiber connection between the optical multiplexing / demultiplexing unit 3 and the OXC unit 2 is normal in the operation of FIG. 6, the optical fiber between the optical switch unit 4 and the optical multiplexing / demultiplexing unit 3 is confirmed. It is determined that there is an error in the connection.

  In step S512, when the transmission side monitor 33 of the optical multiplexing / demultiplexing unit 3 corresponding to the set route monitors the optical level, the optical multiplexing / demultiplexing unit 3 corresponding to the set route is changed to another optical transmitting / receiving unit 5. It is determined whether there is an input of an optical transmission signal from. When 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, when 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 reception side monitor 44 of the optical switch unit 4 monitors the optical level, thereby determining whether or not an optical reception signal is input in the optical switch unit 4. If no optical reception signal is input in the optical switch unit 4, the process proceeds to step S511. On the other hand, when 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 reception-side monitor 12 of the optical amplifying unit 1 monitors the optical level, thereby determining whether or not an optical reception signal is input in the optical amplifying unit 1. If there is an input of an optical reception signal in the optical amplifier 1, the process proceeds to step S515. On the other hand, if no optical reception signal is input in the optical amplifying unit 1, the process proceeds to step S516.

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

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

  In step S517, the reception side monitor 34 of the optical multiplexing / demultiplexing unit 3 monitors the optical level to determine whether the optical multiplexing / demultiplexing unit 3 receives an optical reception signal. If no optical reception signal is input in the optical multiplexing / demultiplexing unit 3, the process proceeds to step S518. On the other hand, when there is an input of an optical reception signal in the optical multiplexing / demultiplexing unit 3, the process proceeds to step S519.

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

  In step S519, the reception-side monitor 44 of the optical switch unit 4 monitors the optical level to determine whether or not an optical reception signal is input in the optical switch unit 4. When there is an input of an optical reception signal in the optical switch unit 4, the process proceeds to step S520. On the other hand, when there is no optical reception signal input 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 optical fiber connection between the optical switch unit 4 and the optical multiplexing / demultiplexing unit 3.

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

  From the above, according to the second embodiment, in a WDM apparatus having a CDC function and including an optical coupler, whether or not the optical fiber is normally connected is confirmed by distinguishing between the transmitting side and the receiving side. be able to. Moreover, when the optical fiber is not normally connected, the location where the connection of the optical fiber is incorrect can be specified.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

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

Claims (30)

An optical amplification unit, an OXC (Optical Cross Connect) unit connected to the optical amplification unit by an optical fiber, an optical multiplexing / demultiplexing unit connected to the OXC unit by an optical fiber, and the optical multiplexing / demultiplexing unit and the optical fiber Optical fiber connection in an optical transmission device capable of transmitting and receiving optical signals in multiple directions, comprising: an optical switch unit connected; an optical transceiver unit connected to the optical switch unit through an optical fiber; and an optical coupler. Check method,
The wavelength of the optical signal transmitted and received by the optical transceiver unit is set to an unused wavelength, or an out-of-service wavelength that is set in advance so that the OXC unit, the optical switch unit, and the optical transceiver unit can be used,
An optical fiber connection confirmation method in an optical transmission apparatus, wherein the optical fiber connection confirmation in the optical transmission apparatus is performed using the unused wavelength or the non-service wavelength.   The optical switch unit corresponding to a predetermined route and the optical multiplexing / demultiplexing unit are connected by the optical fiber, and the OXC unit corresponding to the predetermined route is the unused wavelength or the service. The optical fiber in the optical transmission device according to claim 1, wherein when the optical signal having an outside wavelength is not detected, it is determined that there is an error in the connection of the optical fiber in the predetermined path. Connection confirmation method.   When the optical switch unit does not detect 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 switch unit and the optical transceiver unit, An optical fiber connection confirmation method in the optical transmission device according to claim 2.   The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and transmits the optical signal from another optical transceiver unit to the optical multiplexing / demultiplexing unit corresponding to the predetermined path. The optical fiber connection confirmation in the optical transmission device according to claim 2, wherein when there is an input, it is determined that there is an error in the connection of the optical fiber between the optical multiplexing / 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 from the other optical transceiver unit to the optical multiplexing / demultiplexing unit corresponding to the predetermined path And the optical multiplexing / demultiplexing unit 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 multiplexing / demultiplexing unit and the optical switch unit. The optical fiber connection confirmation method for an optical transmission device according to claim 2, wherein it is determined that there is an optical fiber.   The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and inputs the optical signal from the other optical transceiver unit to the optical multiplexing / demultiplexing unit corresponding to the predetermined path And there is an error in the connection of the optical fiber between the optical multiplexing / demultiplexing unit and the optical switch unit when the optical multiplexing / demultiplexing unit detects the optical signal of the unused wavelength or the non-service wavelength. The optical fiber connection confirmation method in the optical transmission device according to claim 2, wherein the determination is performed.   The optical switch unit corresponding to a predetermined route and the optical multiplexing / demultiplexing unit are not connected by the optical fiber, and the OXC unit corresponding to any one of all the routes is 2. The method according to claim 1, wherein when the optical signal of 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 route. An optical fiber connection confirmation method in an optical transmission apparatus.   When the optical switch unit does not detect 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 switch unit and the optical transceiver unit, An optical fiber connection confirmation method in the optical transmission device according to claim 7.   The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and is connected to a predetermined connection port of a wavelength selective switch included in the OXC unit. 8. The method according to claim 7, wherein when there is an input of the optical signal from another optical transceiver, the optical fiber connection between the optical multiplexing / demultiplexing unit and the optical switch unit is determined to have an error. An optical fiber connection confirmation method in the described optical transmission device.   The optical switch unit detects the optical signal of the unused wavelength or the out-of-service wavelength, and other than the optical multiplexing / demultiplexing unit connected to a predetermined connection port of the wavelength selective switch of the OXC unit When the optical signal is not input from the optical transmission / reception unit and the optical multiplexing / demultiplexing unit connected to the connection port does not detect the optical signal at the unused wavelength or the out-of-service wavelength, 8. The method of confirming an optical fiber connection in an optical transmission device according to claim 7, wherein it is determined that there is an error in the connection of the optical fiber between the optical multiplexing / demultiplexing 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 other than the optical multiplexing / demultiplexing unit connected to a predetermined connection port of the wavelength selective switch of the OXC unit When the optical signal is not input from the optical transmission / reception unit and the optical multiplexing / demultiplexing unit connected to the connection port detects the optical signal of the unused wavelength or the out-of-service wavelength, the OXC unit The optical fiber connection confirmation method for an optical transmission device according to claim 7, further comprising: determining that there is an error in the connection of the optical fiber between the optical multiplexing / demultiplexing units.   The optical amplification unit receives a first filter unit that filters an optical transmission signal that is the optical signal transmitted at the non-service wavelength, and receives the optical transmission signal filtered by the first filter unit as an optical reception signal. The optical fiber connection confirmation method in the optical transmission device according to claim 1, further comprising:   The optical switch unit corresponding to a predetermined route and the optical multiplexing / demultiplexing unit are connected by the optical fiber, and the OXC unit corresponding to the predetermined route does not detect the optical transmission signal. 13. The method of claim 12, wherein there is an error in the connection of the optical fiber on the transmission side of the predetermined route.   The optical switch unit corresponding to a predetermined route and the optical multiplexing / demultiplexing unit are connected by the optical fiber, and the OXC unit corresponding to the predetermined route detects the optical transmission signal, The optical transmission / reception unit determines that there is an error in the connection of the optical fiber on the reception side of the predetermined route when the optical reception signal is not detected. An optical fiber connection confirmation method in the described optical transmission device.   The optical switch unit corresponding to a predetermined route and the optical multiplexing / demultiplexing unit are not connected by the optical fiber, and the OXC unit corresponding to any one of all the routes is 13. The optical fiber connection confirmation in the optical transmission device according to claim 12, 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 route. Method.   If 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 optical fiber connection confirmation method in the optical transmission device according to claim 14, wherein   The optical transmission / reception unit detects the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal from another optical transmission / reception unit, and the optical amplification unit The optical transmission apparatus according to claim 14, wherein when the optical reception signal is not detected, it is determined that there is an error in connection of the optical fiber between the optical amplification unit and the OXC. Fiber connection confirmation method.   The optical transmission / reception unit detects the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal from another optical transmission / reception unit, and 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 optical fiber connection confirmation method in the optical transmission apparatus according to claim 14.   The optical transmission / reception unit detects the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal from another optical transmission / reception unit, and the optical amplification unit When the optical reception signal is detected, the OXC unit detects the optical reception signal, and the optical multiplexing / demultiplexing unit does not detect the optical reception signal, the optical fiber between the OXC and the optical multiplexing / demultiplexing unit 15. The method for confirming an optical fiber connection in an optical transmission device according to claim 14, wherein it is determined that there is an error in the connection.   The optical transmission / reception unit detects the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal from another optical transmission / reception unit, and the optical amplification unit When the optical reception signal is detected, the OXC unit detects the optical reception signal, and the optical multiplexing / demultiplexing unit detects the optical reception signal, the optical fiber between the optical multiplexing / demultiplexing unit and the optical switch unit 15. The method for confirming an optical fiber connection in an optical transmission device according to claim 14, wherein it is determined that there is an error in the connection.   When the optical transmission / reception unit detects the optical reception signal and the optical multiplexing / demultiplexing unit corresponding to the predetermined route has an input of the optical transmission signal from another optical transmission / reception unit, The optical fiber connection confirmation method according to claim 14, 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 multiplexing / demultiplexing unit corresponding to the predetermined path has an input of the optical transmission signal from another optical transmission / reception unit, and the optical switch 15. The optical device according to claim 14, wherein when the optical reception signal is not detected by the unit, it is determined that there is an error in connection of the optical fiber between the optical multiplexing / demultiplexing unit and the optical switch unit. An optical fiber connection confirmation method in a transmission apparatus.   The optical transmission / reception unit does not detect the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has an input of the optical transmission signal from another optical transmission / reception unit, and the optical switch 15. The optical transmission apparatus according to claim 14, wherein when the optical detection signal is detected by a unit, it is determined that there is an error in connection of the optical fiber between the optical switch unit and the optical transmission / reception unit. Optical fiber connection confirmation method.   The optical transmission / reception unit does not detect the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal 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 multiplexing / demultiplexing unit detects the optical reception signal, and the optical switch unit detects the optical reception signal, 15. The optical fiber connection confirmation method according to claim 14, wherein it is determined that there is an error in the connection of the optical fiber between the optical switch unit and the optical transceiver unit.   The optical transmission / reception unit does not detect the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal 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 multiplexing / demultiplexing unit detects the optical reception signal, and the optical switch unit does not detect the optical reception signal 15. The method of confirming an optical fiber connection in an optical transmission device according to claim 14, wherein it is determined that there is an error in the connection of the optical fiber between the optical transceiver unit and the optical switch unit.   The optical transmission / reception unit does not detect the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal from another optical transmission / reception unit, and the optical amplification unit Detects the optical reception signal, the OXC unit detects the optical reception signal, and the optical multiplexing / demultiplexing unit does not detect the optical reception signal, the OXC unit and the optical multiplexing / demultiplexing unit 15. The method for confirming connection of an optical fiber according to claim 14, 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, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal from another optical transmission / reception unit, and 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 unit. The optical fiber connection confirmation method in the optical transmission device according to claim 14.   The optical transmission / reception unit does not detect the optical reception signal, the optical multiplexing / demultiplexing unit corresponding to the predetermined path has no input of the optical transmission signal from another optical transmission / reception unit, and the optical amplification The optical transmission device according to claim 14, wherein when the optical receiver does not detect the optical reception signal, it is determined that there is an error in connection of the optical fiber between the optical amplification unit and the OXC unit. For checking optical fiber connections in Japan.   The optical fiber connection confirmation method for an optical transmission apparatus according to any one of claims 1 to 28, wherein the optical multiplexing / demultiplexing unit includes the coupler.   2. The optical amplification unit, the OXC unit, the optical multiplexing / demultiplexing unit, the optical switch unit, and the optical transmission / reception unit each include a monitor that detects an optical level of the optical signal. 30. A method of confirming connection of an optical fiber in the optical transmission device according to any one of items 1 to 29.

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