JP6560300B2 - Optical transmission device, optical transmission route identification device, and optical transmission route identification method - Google Patents

Description

  The present invention relates to a wavelength division multiplexing signal transmission technique, and more particularly to a technique for specifying a setting state of an optical signal path for each wavelength band.

  Along with the increase in communication traffic, optical transmission network systems are required to have wider bandwidths and higher network functions. As one of the measures, techniques such as OADM (Optical Add-Drop Multiplexer) and ROADM (Reconfigurable Optical Add-Drop Multiplexer) are applied to the optical transmission network system.

  In the ROADM system in a submarine cable system, a client signal is input to a submarine cable as a wavelength multiplexed optical signal by an optical transmission apparatus, and a plurality of paths are accommodated in one optical fiber, thereby improving the flexibility of the network. In addition, such a submarine cable system is often installed in the deep sea, and once laid, it is difficult to cope with a failure or the like. Therefore, high reliability is required for each device constituting the submarine cable system. In order to maintain high reliability, it is desirable that the configuration of each optical transmission device and management network of the submarine cable system be as simple as possible.

  The path setting of the ROADM system can be performed by arbitrarily changing the path assigned to the wavelength remotely by issuing a command from each communication management system or the like to each ROADM device. In order to perform stable communication in the ROADM system having such a configuration, it is necessary to accurately recognize the path setting state and appropriately control the path setting. For this reason, in ROADM systems such as submarine cable systems, a technology for grasping the path setting state from the outside has been developed. In such a ROADM system, as a technique for grasping the path setting state from the outside, for example, a technique such as Patent Document 1 is disclosed.

  Patent Document 1 relates to a technique for recognizing the usage status of a wavelength band in a network including an optical transmission apparatus that transmits and receives wavelength-multiplexed signals, a ROADM apparatus, and an optical cross-connect apparatus. Each optical transmission device of Patent Document 1 generates information that associates identification information of an optical fiber that transmits and receives an optical signal, a wavelength of an optical signal that is transmitted and received, and identification information of the own device. Each optical transmission device disclosed in Patent Document 1 sequentially transmits information between adjacent devices via an OSC (Optical Supervisory Channel) to generate information on the wavelength usage status in the entire network.

  Patent Document 2 discloses a technology for acquiring information on a path of an optical signal in a network by using a connectivity management table describing connectivity between optical cross-connect devices and a relay route management table. In Patent Document 2, a connectivity management table indicating connection relationships within a region and a relay route management table indicating connection relationships between regions and optical transmission devices that are edges are set. Japanese Patent Laid-Open No. 2004-228561 describes that path information that can be set can be acquired based on the connectivity management table and the relay route management table.

Japanese Patent No. 5793955 Japanese Patent No. 4491998

  However, the technique of Patent Document 1 is not sufficient in the following points. In the network system of Patent Document 1, each optical transmission device transmits information between adjacent devices, thereby grasping the wavelength usage status of the entire network. Therefore, it is necessary to repeat the transmission of information until the information of all the optical transmission devices constituting the network is added. Therefore, the number of devices constituting the network and the number of branching devices increase, and information acquisition and path It becomes difficult to specify the setting state. In addition, with the technique of Patent Document 2, it is possible to obtain transmission route candidate information, but it is not possible to obtain transmission route information that is actually set as an optical signal transmission route. For this reason, the techniques of Patent Documents 1 and 2 are not sufficient as techniques for accurately recognizing the path setting state of an optical signal in an optical transmission network system.

  In order to solve the above-described problems, an object of the present invention is to provide an optical transmission apparatus capable of acquiring accurate information on a transmission route of an optical signal in an optical transmission network system.

  In order to solve the above problems, the optical transmission apparatus of the present invention includes a receiving means, an identification information detecting means, and an output means. The receiving means receives the optical signal branched from the wavelength multiplexed signal on the transmission line via the optical add / drop multiplexer. The identification information detection means detects identification information set in advance for each transmitting station and each wavelength band from the optical signal. The output means detects the identification information detected from the optical signals received by each of the plurality of optical transmission apparatuses as a device that determines which of the plurality of route candidates is the optical signal route. Output the identification information.

  The optical transmission route identification method of the present invention receives an optical signal branched from a wavelength division multiplexed signal on a transmission line via an optical add / drop multiplexer. The optical transmission route identification method of the present invention detects identification information set in advance for each transmitting station and each wavelength band from an optical signal. The optical transmission route identification method according to the present invention determines whether an optical signal route is one of a plurality of route candidates based on identification information respectively detected from optical signals received by a plurality of optical transmission devices. The identification information detected by the device itself is output to the device.

  According to the present invention, in the optical transmission network system, accurate information on the setting state of the transmission route of the optical signal can be acquired.

It is a figure which shows the outline | summary of a structure of the 1st Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 2nd Embodiment of this invention. It is a figure which shows the structure of the optical transmission route identification apparatus of the 2nd Embodiment of this invention. It is a figure which shows the example of a structure of the connectivity information of the 2nd Embodiment of this invention. In the 2nd Embodiment of this invention, it is the figure which showed typically the optical transmission route assumed. It is a figure which shows the example of a structure of the connectivity management table | surface of the 2nd Embodiment of this invention. It is a figure which shows the example of a structure of the connectivity management table | surface of the 2nd Embodiment of this invention.

(First embodiment)
A first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an outline of the configuration of the optical transmission apparatus according to this embodiment. The optical transmission apparatus of this embodiment includes a receiving unit 1, an identification information detecting unit 2, and an output unit 3. The receiving means 1 receives the optical signal branched from the wavelength multiplexed signal on the transmission line via the optical add / drop multiplexer. The identification information detecting means 2 detects identification information set in advance for each transmitting station and each wavelength band from the optical signal. The output unit 3 determines whether the optical signal route is one of the plurality of route candidates based on the identification information detected from the optical signals respectively received by the plurality of optical transmission devices. The identification information detected by is output.

  In the optical transmission apparatus of this embodiment, the identification information detection unit 2 detects identification information set in advance for each transmitting station and each wavelength band from the optical signal received by the reception unit 1. Further, the output means 3 is a device that determines whether the route of the optical signal is one of the plurality of route candidates based on the identification information respectively detected from the optical signals received by the plurality of optical transmission devices. The identification information detected by the device itself is output. In this way, an optical transmission device through which an optical signal for each wavelength band passes can be obtained by one device acquiring identification information set in advance for each transmission station and wavelength band acquired by each of the plurality of optical transmission devices. Judgment can be made. Therefore, a device that has acquired identification information from a plurality of optical transmission devices can identify the transmission route of the optical signal. As a result, by using the optical transmission apparatus of the present embodiment, it is possible to acquire accurate information on the setting state of the optical signal transmission route in the optical transmission network system.

(Second Embodiment)
A second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 shows an outline of the configuration of the optical transmission network system of the present embodiment. The optical transmission network system according to the present embodiment is configured as an ROADM (Reconfigurable Optical Add-Drop Multiplexer) system capable of controlling a change in optical signal path setting from a communication management system or the like. The optical transmission network system of this embodiment is configured as a submarine cable system.

  The optical transmission network system of this embodiment includes an optical transmission device 11, an optical reception device 12, a first optical transmission / reception device 13, and a second optical transmission / reception device 14. The optical transmission network system of this embodiment further includes a first OADM (Optical Add Drop Multiplexer) device 15, a second OADM device 16, and an optical transmission route identification device 17.

  The optical transmitter 11, the first OADM device 15, the second OADM device 16, and the optical receiver 12 are connected via a transmission path 101. In the optical transmission network system of the present embodiment, a wavelength multiplexed signal is transmitted from the optical transmitter 11 to the optical receiver 12. Further, the first OADM device 15 and the first optical transmission / reception device 13 are connected via a transmission path 102. Further, the second OADM device 16 and the second optical transmission / reception device 14 are connected via a transmission path 103. The transmission path 102 and the transmission path 103 are configured by optical fiber cables corresponding to the respective directions so that wavelength-division multiplexed signals can be transmitted in both directions. The optical transmitter 11, the optical receiver 12, the first optical transmitter / receiver 13, and the second optical transmitter / receiver 14 are connected to the optical transmission route identification device 17 and the transmission network 201, respectively. The transmission network 201 is configured using a communication network different from the transmission path 101, the transmission path 102, and the transmission path 103.

  The optical transmitter 11, the optical receiver 12, the first optical transmitter / receiver 13 and the second optical transmitter / receiver 14 are installed at a cable landing station in the submarine cable system. In this embodiment, the optical transmitter 11 is the cable landing station A, the optical receiver 12 is the cable landing station B, the first optical transceiver 13 is the cable landing station C, and the second optical transceiver 14 is the cable landing station D. It is assumed that it is installed in. The first OADM device 15 and the second OADM device 16 are each installed as a submarine device.

  The configuration of each device of the optical transmission network system of this embodiment will be described.

  The optical transmission device 11 is an optical transmission device that transmits an optical signal generated based on a client signal. The optical transmission device 11 includes an optical signal transmission unit 21 and a pattern generation unit 22.

  The optical signal transmission unit 21 generates and outputs an optical signal in the wavelength band assigned based on the input client signal. The setting information of the wavelength band of the optical signal is acquired from a communication management system or the like via the transmission network 201, for example. The optical signal transmission unit 21 outputs to the transmission line 101 a wavelength multiplexed signal obtained by wavelength multiplexing of the optical signal generated based on each of the plurality of client signals.

  The pattern generation unit 22 adds identification information for uniquely identifying a transmission station in the wavelength band for each wavelength band that is Add-Dropped in the OADM device. For example, the pattern generation unit 22 uses a dummy light generated to compensate for the optical power of the optical signal, and uses the pattern based on the presence or absence of the dummy light at a preset wavelength as the identification information. The pattern generation unit 22 may output a dummy pattern obtained by converting an electrical signal in which 0 and 1 are arranged into an optical signal in the wavelength region of the dummy light. The pattern generation unit 22 may superimpose the identification information on the main signal optical signal by performing low-frequency modulation on the optical signal. Low-frequency modulation refers to low-frequency modulation compared to the modulation cycle of the main signal in a frequency region that does not affect processing such as detection and decoding of an optical signal for data transmission.

  The optical receiving apparatus 12 is an optical transmission apparatus that receives a wavelength-multiplexed signal via the transmission path 101, performs a decoding process on a signal in each wavelength band, and outputs the signal. The optical receiver 12 includes an optical signal receiver 31 and a pattern detector 32.

  The optical signal receiving unit 31 includes a demultiplexing element that demultiplexes the wavelength multiplexed signal, a photoelectric conversion element that converts light in each wavelength band into an electric signal, a signal processing circuit that performs compensation and decoding of the received signal in each wavelength band, and the like It has. The optical signal receiver 31 outputs each signal decoded from the received signal in each wavelength band as a client signal.

  The pattern detection unit 32 detects the pattern of the identification signal added as identification information by the transmission side pattern generation unit. The pattern detection unit 32 sends the detected pattern information to the optical transmission route identification device 17 via the transmission network 201. The pattern detection unit 32 is configured to correspond to a method in which the pattern generation unit on the transmission side adds identification information to the optical signal. For example, when identification information is transmitted in the wavelength region of dummy light, the pattern detection unit 32 has a configuration for detecting light in the wavelength region of dummy light and identifying the detected light pattern. The pattern detection unit 32 may transmit information indicating that the identification information could not be detected to the optical transmission route identification device 17 when the signal based on the identification information could not be detected in the wavelength band to be monitored. . By transmitting information indicating that the identification information could not be detected, the optical transmission route identification device 17 can more accurately determine the transmission route of the optical signal.

  The first optical transmitter / receiver 13 and the second optical transmitter / receiver 14 are dropped from the wavelength multiplexed signal on the transmission path 101 in the OADM apparatus and the output of the optical signal added to the wavelength multiplexed signal on the transmission path 101 in the OADM apparatus. An optical transmission device that receives a received optical signal. The first optical transceiver 13 and the second optical transceiver 14 each include an optical signal transceiver 41, a pattern generator 42, and a pattern detector 43.

  The optical signal transmission / reception unit 41 converts the inputted client signal into an optical signal and outputs the optical signal to the transmission path 102 or the transmission path 103. In addition, the optical signal transmission / reception unit 41 decodes an optical signal received via the transmission path 102 or the transmission path 103 and outputs it as a client signal. The function of receiving the optical signal in the optical signal receiving unit 31 and the optical signal transmitting / receiving unit 41 corresponds to the receiving unit 1 of the first embodiment.

  The configuration and function of the pattern generation unit 42 are the same as those of the pattern generation unit 22 of the optical transmission device 11. The pattern generation unit 42 generates signal light based on identification information set for each wavelength band as a transmission source of the optical signal to be added to the wavelength multiplexed signal in the OADM device, and the transmission path 102 or the transmission path 103 together with the optical signal to be added. Output to.

  The configuration and function of the pattern detection unit 43 are the same as those of the pattern detection unit 32 of the optical receiver 12. The pattern detection unit 43 detects a pattern indicating the identification information of the transmission source of the optical signal dropped from the wavelength multiplexed signal in the OADM device, and transmits the detected identification information for each wavelength band to the optical transmission route identification device 17 in the transmission network 201. To send through. Moreover, the function which detects identification information among the functions of the pattern detection part 32 of this embodiment and the pattern detection part 43 is equivalent to the identification information detection means 2 of 1st Embodiment. The function of outputting the detected identification information among the functions of the pattern detection unit 32 and the pattern detection unit 43 of the present embodiment to the optical transmission route identification device 17 via the transmission network 201 is the output means of the first embodiment. It corresponds to 3.

  The first OADM device 15 and the second OADM device 16 add the optical signal to the wavelength multiplexed signal transmitted via the transmission path 101 and the optical signal from the wavelength multiplexed signal transmitted via the transmission path 101. It has a function to perform the drop. The first OADM device 15 and the second OADM device 16 are optical add / drop devices compatible with the ROADM system. When the signal light based on the identification information indicating the transmission source of the optical signal is set in the wavelength band for the dummy signal, the first OADM device 15 and the second OADM device 16 have the wavelength band for the dummy signal. The light is added or dropped in the same manner as the optical signal for data transmission.

  The configuration of the optical transmission route identification device 17 will be described. FIG. 3 shows the configuration of the optical transmission route identification device 17 of this embodiment. The optical transmission route identification device 17 includes a communication unit 51, a route identification unit 52, and a connectivity information storage unit 53. The optical transmission route identification device 17 has a function of determining the path of the optical signal in each wavelength band, that is, the transmission route of the optical signal in each wavelength band.

  The communication unit 51 communicates with the optical transmission device 11, the optical reception device 12, the first optical transmission / reception device 13, and the second optical transmission / reception device 14 via the transmission network 201. When the communication unit 51 receives the identification information of the transmission source of the received signal from the optical reception device 12, the first optical transmission / reception device 13, and the second optical transmission / reception device 14, the communication unit 51 sends the received identification information to the route identification unit 52.

  The route identification unit 52 compares the identification information of the transmission source of the optical signal with the connectivity management slip, and identifies the path of the optical signal for each wavelength band, that is, the transmission route of the optical signal. The route identification unit 52 refers to the connectivity management table stored in the connectivity information storage unit 54 and identifies the path of the optical signal.

  The connectivity management table is information indicating connectivity information between optical transmission apparatuses of each cable landing station as connectivity information. The connectability indicates a path assumed from the network configuration, that is, a candidate for an optical signal transmission route. FIG. 4 shows an example of the connectivity management table. The connectivity management table is composed of information on the cable landing stations that pass for each optical signal transmission route and information on the pattern signal indicating the transmission source of the optical signals received at each cable landing station. The connectivity management table is set for each wavelength band of an optical signal transmitted in the optical transmission network system. The connectivity management table is configured by information in which pattern signals indicating transmission sources of optical signals received at each station for each optical transmission route are collected as a matrix table.

  The route identification unit 52 compares the signal pattern of the identification information actually received by each cable landing station with the connectivity management table, and determines the transmission route for each wavelength band. By determining the transmission route for each wavelength band by such a method, the optical transmission route identification device 17 can acquire the information on the wavelength band of the optical signal being added-dropped in each OADM device.

  The detection of the pattern signal of the optical signal received (Drop) at each cable landing station is performed, for example, by an instruction from the optical transmission route identification device 17 at a timing when the optical transmission route needs to be identified. Moreover, even if the optical transmission route identification device 17 continuously monitors the transmission route for each wavelength band by constantly detecting the pattern signal of the optical signal received (Drop) at each cable landing station. Good.

  The connectivity information storage unit 53 stores data of the connectivity management table. The connectivity information storage unit 53 is formed by a storage device such as a nonvolatile semiconductor storage device or a hard disk drive.

  The transmission path 101, the transmission path 102, and the transmission path 103 are configured by repeaters such as submarine cables and amplifiers formed by optical fibers and feeder lines. The transmission network 201 uses a communication network that is independent of the submarine cable system including the transmission path 101, the transmission path 102, and the transmission path 103.

  In the optical transmission network system of the present embodiment, an operation when the optical transmission route identification device 17 specifies a transmission route for each wavelength band and identifies a path setting state will be described.

  An example will be described in which an optical signal transmission route when an optical signal in the wavelength band X is transmitted in the optical transmission network system of the present embodiment is specified, and information on a path setting state is acquired. As shown in FIG. 5, in the optical transmission network system of the present embodiment, six routes from route 1 to route 6 are assumed as the path of wavelength band X. In the following description, it is assumed that the optical transmitter 11 of the cable landing A station adds the identification signal of the pattern 1 to the main signal in the wavelength band X and transmits it. Further, it is assumed that the first optical transmission / reception device 13 of the cable landing C station adds the identification signal of the pattern 2 to the main signal of the wavelength band X and transmits it. Further, it is assumed that the second optical transmission / reception device 14 of the cable landing D station adds the identification signal of the pattern 3 to the main signal of the wavelength band X and transmits it. FIG. 6 shows an example of the connectivity management table for the wavelength band X when such an identification signal is added to the wavelength band X.

  The pattern detection unit of the optical transmission device of each cable landing station detects the pattern of the identification signal added as identification information to the main signal in the wavelength band X. Each cable landing station sends the detected pattern information to the optical transmission route identifying device 17 via the transmission network 201 when the pattern detecting unit detects the pattern of the identification signal.

  When receiving the identification information indicating the transmission source of the main signal from each cable landing station, the route identification unit 52 of the optical transmission route identification device 17 receives the identification signal indicating the transmission source of the wavelength band X at each cable landing station. The connectivity management tables in the connectivity information storage unit 53 are compared.

  For example, when the cable landing B station receives the pattern 1 and the cable landing C station and the cable landing D station do not receive the identification signal indicating the transmission source of the wavelength band X, the combination of the received identification information is as shown in FIG. This applies to route 1 of 6. In this way, when the received identification information applies to the combination of route 1 in FIG. 6, the route identification unit 52 determines that the transmission route of the optical signal in the wavelength band X is route 1.

  Also, for example, when the cable landing B station receives the pattern 2 and the cable landing C station and the cable landing D station do not receive the identification signal indicating the transmission source of the wavelength band X, the combination of the received identification information is This applies to route 4 in FIG. As described above, when the received identification information is applicable to the combination of the route 4 in FIG. 6, the route identification unit 52 determines that the transmission route of the optical signal in the wavelength band X is the route 4.

  Further, a case where an optical signal in the wavelength band Z is transmitted by the optical transmission network system of the present embodiment will be described as an example. For the wavelength band Z, it is assumed that the optical transmitter 11 of the cable landing A station adds the identification signal of pattern a to the main signal and transmits it. In addition, it is assumed that the first optical transmission / reception device 13 of the cable landing C station adds the identification signal of the pattern c to the main signal in the wavelength band Z and transmits it. In addition, it is assumed that the second optical transmission / reception device 14 of the cable landing D station transmits an identification signal of the pattern d added to the main signal of the wavelength band Z. FIG. 7 shows an example of the connectivity management table for the wavelength band Z when such an identification signal is added to the wavelength band Z.

  For example, when the cable landing B station and the cable landing B station cannot receive the identification signal of the wavelength band Z and the cable landing D station receives the identification signal of the pattern a, the combination of the received identification information is as shown in FIG. This is true for Route 3. When the received combination of identification information applies to the route 3 in FIG. 7, the route identification unit 52 determines that the path of the wavelength band Z is the route 3.

  When the optical transmission route identification device 17 identifies the path setting state of the optical signal in each wavelength band, the optical transmission route identification device 17 outputs information on the path setting state of each wavelength band to the communication management device or the display device. In this way, the identification signal having a different pattern for each wavelength band and transmission source constituting the path by the OADM function is set as the identification information, and the combination of the received identification information and the connectivity management table are compared, so that the wavelength band The setting information of each path can be acquired.

  The ROADM device used as an optical add / drop device in the ROADM system can extract an optical signal of an arbitrary wavelength from the wavelength-multiplexed optical signal, and conversely mix light of an arbitrary wavelength. Therefore, the ROADM device can perform flexible path management while maintaining a high transmission rate. As described above, in the ROADM apparatus, a path for transferring data using an optical signal is set between transmission apparatuses instead of inputting and outputting signals in units of packets. This path setting can arbitrarily change the path assigned to the wavelength remotely by issuing a command to each ROADM device.

  On the other hand, because the path is changed by remote command transmission, the path is correct if the command does not reach the ROADM device for some reason or the ROADM device does not operate normally. Occasionally it will not switch. In this case, the optical signal can be transferred to a device that is not the original transmission destination device. As a result, the confidentiality of information included in the optical signal cannot be ensured, which may cause a security problem.

  In particular, if a path through a plurality of ROADM devices is not connected correctly, the optical signal is transferred to a device that is not the original transmission destination device, and the current path setting status is unknown. Such a path may not be able to be determined. In a submarine ROADM system used for a submarine cable system, a ROADM device itself that controls a path of an optical signal is also installed on the seabed. Submarine cables may be installed at a depth of 8000 meters. In order to reduce the possibility of failure, it is advantageous that each device of the ROADM system installed on the sea floor where such maintenance is difficult is a device having a simpler circuit configuration.

  In the optical transmission network system of the present embodiment, the optical transmission device of each cable landing station only needs to transmit the identification information received from the received signal via the transmission network 201, and thus an apparatus for acquiring path information. The complexity of the configuration can be suppressed. Therefore, the optical transmission network system can maintain high reliability. Moreover, since identification information should just be acquired from the cable landing station installed on land via a communication line, it can be acquired via communication network systems other than the submarine cable system from which the path information is acquired. it can. Therefore, in the optical transmission network system, it is possible to reliably grasp the path setting state information from the outside without adding a complicated circuit for path monitoring.

  In the optical transmission network system of this embodiment, the optical transmission route identification device 17 specifies the transmission route of the optical signal based on the identification information indicating the transmission source of the optical signal received at each landing station and the connectivity management table. doing. Therefore, the optical transmission network system of this embodiment can specify the transmission route of the optical signal even when a plurality of OADM devices pass between the optical transmission devices. As a result, the optical transmission network system of this embodiment can acquire accurate information on the path setting state.

  In the second embodiment, an example in which the optical transmission network system is used in a submarine cable system has been described. However, the optical transmission network system in the second embodiment may be used in a communication network system other than the submarine cable system. Good. The optical transmission network system according to the second embodiment transmits the wavelength multiplexed signal only in one direction from the optical transmission device 11 to the optical reception device 12, but may be configured to perform bidirectional communication. . In the case of such a configuration, an optical transmission device having a configuration equivalent to that of the first optical transmission / reception device 13 is used in place of the optical transmission device 11 and the optical reception device 12. Further, although the optical transmission network system of the second embodiment includes two OADM devices, the number of OADM devices may be three or more.

DESCRIPTION OF SYMBOLS 1 Reception means 2 Identification information detection means 3 Output means 11 Optical transmission apparatus 12 Optical reception apparatus 13 1st optical transmission / reception apparatus 14 2nd optical transmission / reception apparatus 15 1st OADM apparatus 16 2nd OADM apparatus 17 Optical transmission route identification Device 21 Optical signal transmission unit 22 Pattern generation unit 31 Optical signal reception unit 32 Pattern detection unit 41 Optical signal transmission / reception unit 42 Pattern generation unit 43 Pattern detection unit 51 Communication unit 52 Route identification unit 53 Connectivity information storage unit 101 Transmission path 102 Transmission Path 103 transmission path 201 transmission network

Claims (10)

Receiving means for receiving an optical signal branched from the wavelength division multiplexed signal on the transmission line via the optical add / drop multiplexer;
Identification information detection means for detecting identification information set in advance for each transmitting station and wavelength band from the optical signal;
Based on the identification information detected from the optical signals respectively received by a plurality of optical transmission devices, the device determines whether the optical signal route is one of a plurality of route candidates. An optical transmission device comprising: output means for outputting the detected identification information. An optical signal generating means for generating a second optical signal transmitted through the transmission path;
Identification signal generating means for generating an identification signal corresponding to the wavelength band of the second optical signal and the identification information of the own device;
The optical transmission device according to claim 1, further comprising: a transmission unit configured to transmit the second optical signal and the identification signal to the transmission path via the optical add / drop device.   The output means outputs information indicating that the identification information could not be detected when the identification information detection means could not detect the identification information corresponding to a wavelength band set as a monitoring band. The optical transmission device according to claim 1, wherein:   4. The optical transmission apparatus according to claim 1, wherein the identification information is transmitted by modulating dummy light for compensating optical power.   4. The optical transmission device according to claim 1, wherein the identification information is transmitted by performing modulation on the optical signal at a frequency lower than a frequency at which modulation is performed on the main signal. 5. . Identification information acquisition means for acquiring identification information indicating a transmission source of the optical signal detected by the optical transmission device, from a plurality of optical transmission devices that receive the optical signal branched from the wavelength division multiplexed signal on the transmission path;
The optical signal route assumed from the network configuration and the information of the identification signal received by each optical transmission device when the optical signal is transmitted along the route are associated for each wavelength band. Connectivity information storage means for storing information as connectivity information;
Path identification means for comparing the identification information detected by each of the plurality of optical transmission devices with the connectivity information stored in the connectivity information storage means to determine the route of the optical signal; An optical transmission route identification device characterized by the above. An optical signal generating means for generating an optical signal transmitted through the transmission line; an identification signal generating means for generating an identification signal corresponding to the identification information of the device set in advance for each wavelength band; the optical signal; and the identification A first optical transmission device comprising: transmission means for transmitting a signal to the transmission line via an optical add / drop device;
A plurality of second optical transmission devices comprising the optical transmission device according to claim 1;
An optical transmission route identification device according to claim 6,
The optical transmission route identification device acquires the identification information received by each of the plurality of second optical transmission devices, and compares the acquired identification information with the connectivity information to determine the route of the optical signal. An optical transmission network system. Receives the optical signal branched from the wavelength multiplexed signal on the transmission line via the optical add / drop device,
Detecting identification information set in advance for each transmitting station and wavelength band from the optical signal,
Based on the identification information detected from the optical signals respectively received by a plurality of optical transmission devices, the device determines whether the optical signal route is one of a plurality of route candidates. An optical transmission route identification method, comprising: outputting the detected identification information. Generating an optical signal transmitted through the transmission path;
Generate an identification signal based on the identification information of the device set in advance for each wavelength band,
9. The optical transmission route identification method according to claim 8, wherein the optical signal and the identification signal are transmitted to the transmission path via the optical add / drop device. The optical signal route assumed from the network configuration and the information of the identification signal received by each optical transmission device when the optical signal is transmitted along the route are associated for each wavelength band. Store the information as connectivity information,
From a plurality of optical transmission devices that receive the optical signal branched from the wavelength division multiplexed signal on the transmission path, to obtain identification information indicating the transmission source of the optical signal detected by the optical transmission device, respectively
10. The optical transmission route identification according to claim 8 or 9, wherein the identification information detected by each of the plurality of optical transmission devices is compared with stored information to determine the route of the optical signal. Method.

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