JP2012094947A - Optical monitoring control system and method for optical wavelength multiplex communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep operation of an optical wavelength multiplex communication device normal even if miscount of the number of wavelengths occurs or unnecessary data gets mixed with secondary signal light for monitoring control due to maintenance work.SOLUTION: An optical wavelength multiplex communication device comprises: a first device unit which outputs operational information regarding operation, and during maintenance work, outputs maintenance work indication information; and a second device unit which is placed behind the first device unit and which receives transmission of the operational information, and when receiving the maintenance work indication information from the first device unit, which ignores the operational information transmitted by the first device unit, and outputs the operational information that was transmitted and held immediately before receiving the maintenance work indication information.

Description

  The present invention relates to an optical supervisory control system for an optical wavelength division multiplex communication apparatus, and more particularly, to an optical wavelength multiplex communication apparatus that enables maintenance work of an optical supervisory control unit without affecting optical signal multiplexed main signal light. The present invention relates to a light monitoring control system and method.

  Optical wavelength division multiplex communication is high-speed and large-capacity information communication means that simultaneously transmits a plurality of optical signals having different wavelengths and multiplexes and transmits these optical signals within a single optical fiber. It is also called wavelength division multiplex communication (WDM, Wavelength Division Multiplex). The transmission side of the optical wavelength division multiplexing communication performs data modulation of different channels on a plurality of lights having different wavelengths, wavelength-multiplexes them with a multiplexer, and transmits them to an optical fiber transmission line. Further, the receiving side extracts only light of a desired wavelength from the received wavelength multiplexed signal light by using wavelength selection means such as an optical bandpass filter, and demodulates the original data.

  FIG. 1 is a block diagram showing the principle configuration of an optical wavelength division multiplexing communication apparatus.

  On the signal transmission side, an optical oscillator 150, a transmission circuit 151, and an optical multiplexing circuit 152 are main components. The optical oscillator 150 is a semiconductor laser that oscillates light having different wavelengths (λ1 to λn). The transmission circuit 151 performs data modulation on light of different wavelengths emitted from the optical oscillator 150 and transmits an optical signal. The optical multiplexing circuit 152 wavelength-multiplexes the transmission signals transmitted from the respective transmission circuits 150 and sends them to the optical fiber.

  The signal receiving side includes the optical demultiplexing circuit 250 and the receiving circuit 251 as main components. A signal received from the optical fiber is separated into light of each wavelength (λ1 to λn) by the optical demultiplexing circuit 250. The receiving circuit 251 corresponding to each wavelength of light performs data demodulation and outputs the original data.

  FIG. 2 is a block diagram showing a path of main signal light transmitted by optical wavelength multiplexing and a sub-signal light for supervisory control called OSC (Optical Supervision Channel) in the optical wavelength division multiplexing communication apparatus.

  The A station 100 includes a transmission unit that transmits main signal light from the left side to the right side in FIG. 2 and a reception unit that transmits main signal light from the right side to the left side in FIG. Further, the B station 200 includes a receiving unit that transmits main signal light from the left side to the right side in FIG. 2 and a transmission unit that transmits main signal light from the right side to the left side in FIG.

  The transmission of the main signal light is the same as that described in principle with reference to FIG. 1, but here a configuration using an optical amplifier is shown. The transmitting side amplifies and transmits when sending a signal to the optical fiber between the stations, and the receiving side amplifies the signal attenuated through the optical fiber between the stations and performs reception processing.

  On the transmitting side of the station A, optical signals of different wavelengths are wavelength-multiplexed by the multiplexing unit 101 and amplified as the main signal light by the optical amplifier 102, and the sub signal light, which will be described later, is further multiplexed by the multiplexer 103. And sent out to an optical fiber (not shown) between the stations. The optical signal of each wavelength is subjected to data modulation before being input to the multiplexing unit 101.

  On the receiving side of station B, an optical signal received from an optical fiber (not shown) between the stations is separated into main signal light and sub signal light by a duplexer 201. The main signal light is amplified by the optical amplifier 202 and then input to the separation unit 203, where it is separated and received as an optical signal of each wavelength. The received optical signal is demodulated and output as a received signal.

  The receiving side of the A station performs the same operation as that of the receiving side of the B station using the duplexer 104, the optical amplifier 105, and the separation unit 106. Similarly, the transmitting side of the B station performs the same operation as the transmitting side of the A station using the multiplexing unit 204, the optical amplifier 205, and the multiplexer 206.

  Here, it is assumed that the optical amplifier operates in an ALC (Automatic Level Control) mode. An optical amplifier operating in the ALC mode has a gain so that the total output P of the optical amplifier is “n × Pn”, where the number of multiplexed wavelengths is “n” and the target output level per wave is “Pn”. Control. That is, the optical amplifier performs control so that the total output level is constant even when the input level varies.

  Therefore, in the wavelength-multiplexed optical signal input to the optical amplifier, when one wavelength is cut off, or conversely, when one wave is added, the target output level per wave is different. End up. Since the optical amplifier is controlled so that the total output level is constant, when one wave of the wavelength is cut off, the wavelengths other than the cut off are more strongly amplified. Moreover, when one wave is added, the output level for every wavelength falls.

  Therefore, the multiplexed wavelength number information is notified by the supervisory control OSC, and the optical amplifier controls the output level by changing the target total level based on this information. Optical channel monitoring units 110 and 200 and optical monitoring signal transmission units 120 and 220 are provided as a configuration for performing this supervisory control.

  For example, the optical channel monitoring unit 110 of the station A 100 monitors the main signal light handled by the optical amplifier 102 and identifies the number of operating channels (number of multiplexed wavelengths) (circled number 1). In the optical wavelength multiplexing method, each channel is identified by wavelength. The number of wavelengths identified by the optical channel monitoring unit 110 is sent to the optical monitoring signal transmission unit 120 (circled number 2).

  The optical monitoring signal transmission unit 120 transmits the number of wavelengths received from the optical channel monitoring unit 110 to the B station 200 through the OSC path as sub-signal light for monitoring control. That is, the sub signal light including the wavelength number information is multiplexed with the main signal light by the multiplexer 103 and sent to an optical fiber (not shown) between the stations (circled number 3).

  The duplexer 201 of the B station 200 that has received the optical signal from the optical fiber (not shown) between the stations separates the main signal light and the sub signal light (wavelength number information). The separated sub signal light (wavelength number information) is sent to the optical monitoring signal transmission unit 220 (circled number 4). The optical supervisory signal transmission unit 220 sends the wavelength number information included in the sub signal light to the optical amplifier 202 (circled number 5).

  As described above, information on the number of wavelengths in operation is reported to the optical amplifier 202 on the receiving side, and optimal amplification control is thereby performed.

  The OSC path through which the wavelength number information is transmitted from the B station 200 to the A station 100 is as follows. In the B station 200, the signal is transmitted to an optical fiber (not shown) between the stations via the optical amplifier 205, the optical channel monitoring unit 210, the optical monitoring signal transmission unit 220, and the multiplexer 206. Further, the A station 100 receives from an optical fiber (not shown) between the stations, and reaches the duplexer 104, the optical supervisory signal transmission unit 120, and the optical amplifier 105. That is, the route is a circled number 11-15.

  As described above, the supervisory control sub-signal light is transmitted without affecting the main signal light, and is transmitted without passing through the optical amplifier.

  For example, techniques as disclosed in Patent Documents 1 to 4 are disclosed as techniques relating to maintenance of optical wavelength division multiplexing communication.

  Patent Document 1 discloses a technique related to a wavelength division multiplexing optical transmission apparatus provided with LD (Laser Diode) wavelength stabilization and a failure light source recovery means in a wavelength division multiplexing optical communication system.

  Patent Document 2 discloses an optical system that can flexibly control an optical output level when a failure occurs in an optical transmission line of an optical transmission system, or when the failure is recovered and operation of the optical transmission system is restored. A technique relating to a level control method is disclosed. In addition, this Patent Document 2 has a description on laser safety, which is a control method and a control method for preventing light leaking at a failure location from improperly affecting a worker engaged in failure recovery. .

  Patent Document 3 discloses a technique related to a monitoring control method of an optical amplifier that can automatically perform gain adjustment, startup, and the like at low cost. In particular, it is described that the optical preamplifier receives a notification of the number of wavelengths from the previous node and a normal operation state notification indicating whether or not the optical postamplifier of the previous node is operating normally by a supervisory control signal. . These pieces of information are used to switch whether the gain control method of the gain control circuit is performed by ALC or AGC (Automatic Gain Control).

  Patent Document 4 discloses a technique related to an optical switching device, an optical transmission system using the optical switching device, and an optical signal path setting method in the optical switching device. The technology disclosed in Patent Document 4 is that an unnecessary alarm is generated by performing an appropriate mask process in a switching device using an optical switch so as not to detect a disconnection of an output optical signal generated at the time of path switching as a failure. Is preventing.

JP 2000-078112 JP JP 2002-077056 Japanese Patent Laid-Open No. 2003-163643 JP2003-224872

  As maintenance work of the optical wavelength division multiplexing communication apparatus, there are exchange work of various circuit units and connection optical fibers inside the apparatus. For the purpose of improving reliability and non-disruptive operation, when the redundant configuration of the active system and the standby system is applied to the main part in the optical wavelength multiplexing communication device, these maintenance operations are performed by the optical wavelength multiplexing communication device. It is done in the state. The maintenance work is performed after the maintenance target device is switched to the standby system. However, since the work is performed by human intervention, it cannot be said that the maintenance device is necessarily affected.

  Maintenance work of the optical monitoring and control unit of the optical wavelength division multiplexing communication apparatus includes replacement of a circuit board and replacement of an optical fiber for internal connection. For example, when the maintenance work of the optical channel monitoring unit or the maintenance work of the optical fiber connecting the optical amplifier and the optical channel monitoring unit, an erroneous count of the wavelength number information occurs, or during the maintenance work of the optical monitoring signal transmission unit, Dust data may be mixed in the sub signal light.

  For example, when the optical channel monitoring unit erroneously counts the number of wavelengths in operation in the optical amplifier and determines that the number of wavelengths is “0”, the erroneous wavelength number information is transmitted to the optical amplifier on the receiving side. . The optical amplifier on the receiving side stops the optical output because the notified number of wavelengths is “0”. For this reason, the main signal light is interrupted.

  In addition, there is a problem that the apparatus falls into an abnormal state when dust data associated with maintenance work is mixed into the OSC and transmitted as a monitoring control signal.

  An object of the present invention is to provide an optical supervisory control method and method for an optical wavelength division multiplexing communication apparatus that can maintain the operation of the apparatus normally even if an erroneous count of wavelengths associated with maintenance work or dust data is mixed into the OSC. Is to provide.

  In order to achieve the above object, an optical monitoring and control method for an optical wavelength division multiplexing communication apparatus according to one aspect of the present invention outputs first operation information related to operation and outputs display information during maintenance work during maintenance work. The device unit and the first device unit are arranged at the rear of the first device unit, receive the operation information, and receive the maintenance work display information from the first device unit. A second device unit that ignores the operation information transmitted from the device unit and outputs the operation information transmitted and held immediately before receiving the maintenance work display information. .

  The optical monitoring control method for an optical wavelength division multiplexing communication apparatus according to another aspect of the present invention outputs operation information related to operation in the first apparatus unit, and is undergoing maintenance work during the maintenance operation of the first apparatus unit. The display device outputs the display information, receives the operation information from the first device unit, and receives the maintenance information from the first device unit in the second device unit arranged at the rear of the first device unit. When receiving the work-in-progress display information, the operation information transmitted from the first device unit is ignored, and the operation information transmitted and held immediately before receiving the maintenance-in-progress display information is retained. It is characterized by outputting.

  The present invention provides an optical wavelength division multiplexing communication apparatus that does not affect the main signal light even if an erroneous count of wavelengths associated with maintenance work of the optical monitoring control unit of the optical wavelength division multiplexing apparatus or dust data is mixed into the OSC. Can be maintained normally.

It is a block diagram which shows the principle structure of an optical wavelength division multiplexing apparatus. It is a block diagram which shows the structure of the optical supervisory control part of an optical wavelength division multiplexing apparatus, and the path | route of the sub signal light of OSC (for supervisory control). It is a block diagram which shows the structure of the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of 1st Embodiment. It is a block diagram which shows the structure of the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of 2nd Embodiment. It is a block diagram which shows the structure of the modification of the 2nd Embodiment of this invention. It is a flowchart which shows the operation | movement of the modification of 2nd Embodiment. It is a block diagram which shows the structure of the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of 3rd Embodiment. It is a block diagram which shows the structure of the 4th Embodiment of this invention. It is a flowchart which shows operation | movement of 4th Embodiment.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 3 is a block diagram showing the configuration of the first exemplary embodiment of the present invention.

  The embodiments are examples, and the disclosed apparatus and system are not limited to the configurations of the following embodiments.

  The first embodiment includes a first device unit 1 and a second device unit 2. The first device unit 1 outputs operation information related to operation, and outputs display information during maintenance work during maintenance work. The second device unit 2 is arranged at the rear of the first device unit 1 and receives operation information. When the second device unit 2 receives the maintenance work display information from the first device unit 1, the second device unit 2 ignores the operation information transmitted from the first device unit 1 and displays the maintenance work display information. The operation information transmitted and held immediately before reception is output.

  FIG. 4 is a flowchart showing the operation of the first embodiment.

  The first device unit outputs operation information related to operation (S101), and outputs maintenance-in-progress display information during the maintenance operation of the first device unit (S102, YES) (S103). Then, the second device unit arranged at the rear of the first device unit receives the operation information from the first device unit and outputs it (S105). When the maintenance work display information is received from the first device unit (S104, yes), the operation information transmitted from the first device unit is ignored (S106), and the maintenance work display information is received. The operation information transmitted and held immediately before is output (S107).

  As described above, in the first embodiment, the first device unit 1 is configured to output display information during maintenance work during maintenance work. While receiving the display information during maintenance work, the second device unit 2 is transmitted from the first device unit 1 because there is no fear of occurrence of a phenomenon affecting the device. Ignore operational information. The second device unit 2 is configured to output the operation information that has been transmitted and held immediately before receiving the display information during maintenance work, that is, that has been operated until immediately before. For this reason, even if an erroneous counting of the number of wavelengths associated with maintenance work or garbage data is mixed into the OSC, the operation information that has been operated until immediately before is used in the succeeding device section and the operation of the device is maintained normally. Is done.

  Next, a second embodiment of the present invention will be described.

  FIG. 5 is a block diagram showing a configuration of the second exemplary embodiment of the present invention.

  In the first embodiment, the first device unit 1 corresponds to the optical channel monitoring unit 10, and the second device unit 2 corresponds to the optical monitoring signal transmission unit 20.

  In the second embodiment, the optical channel monitoring unit 10 monitors the main signal light passing through the optical amplifier 30, measures the number of wavelengths corresponding to the channel being operated, and outputs wavelength number information. The number-of-wavelength information output from the optical channel monitoring unit 10 is received by the optical monitoring signal transmission unit 20, converted into sub-signal light that is an optical monitoring signal, and output. The sub signal light output from the optical supervisory signal transmission unit 20 is multiplexed with the main signal light amplified by the optical amplifier 30 and transmitted to the opposite station.

  That is, the optical channel monitoring unit 10 receives the wavelength-multiplexed main signal light from the optical amplifier 30 and periodically identifies each wavelength included therein to obtain the number of wavelengths. The obtained wavelength number is held until the next identified wavelength number is obtained. The obtained wavelength number is output as wavelength number information.

  Further, the optical channel monitoring unit 10 outputs display information during maintenance work during the maintenance work of the device. This maintenance-in-progress display information is output when the active system and the standby system of the device are switched, or when the device is specified and an explicit output instruction is received from a control device (not shown). The

  The optical monitoring signal transmission unit 20 periodically receives the wavelength number information from the optical channel monitoring unit 10. The optical supervisory signal transmitter 20 converts this wavelength number information into sub-signal light and outputs it as an optical supervisory signal to be notified to the opposite station (not shown). The optical supervisory signal transmission unit 20 holds the wavelength number information transmitted once until the wavelength number information transmitted next is obtained.

  When the optical monitoring signal transmission unit 20 receives the display information during maintenance work from the optical channel monitoring unit 10, the optical monitoring signal transmission unit 20 receives the information on the number of wavelengths transmitted from the optical channel monitoring unit 20 simultaneously with and after the reception of the display information during maintenance work. ignore. Then, the optical monitoring signal transmission unit 20 converts the wavelength number information transmitted and held immediately before receiving the display information during maintenance work into the sub signal light and transmits it as the optical monitoring signal.

  As long as display information during maintenance work is received from the optical channel monitoring unit 10, the optical monitoring signal transmission unit 20 ignores the wavelength number information transmitted from the optical channel monitoring unit 20, and retains the wavelength The above operation using numerical information is executed.

  When the maintenance work in the optical channel monitoring unit 10 is finished, the output of the maintenance work display information is stopped. The display information during maintenance work is stopped when an explicit stop instruction is received from a control device (not shown) or a control operation panel of the device by a maintenance worker operation. When the display information during maintenance work stops, the optical monitoring signal transmission unit 20 converts the wavelength number information transmitted from the optical channel monitoring unit 10 into sub-signal light as operation information and transmits it. Of course, the transmitted wavelength number information is held until the next wavelength number information is transmitted.

  FIG. 6 is a flowchart showing the operation of the second embodiment.

  First, the optical channel monitoring unit monitors the main signal light passing through the optical amplifier (S201), measures the number of wavelengths corresponding to the channel being operated, and outputs wavelength number information (S202).

  During maintenance work of the optical channel monitoring unit (S203, YES), display information during maintenance work is output (S204).

  The optical monitoring signal transmission unit outputs the wavelength number information transmitted from the optical channel monitoring unit as sub-signal light in a normal time (S205, none) when the display information during maintenance work is not received (S206).

  In addition, while the maintenance work display information is being received from the optical channel monitoring unit (Yes in S205), the optical monitoring signal transmission unit ignores the wavelength number information transmitted from the optical channel monitoring unit (S207). Then, the number-of-wavelength information transmitted and held immediately before receiving the display information during maintenance work is output as sub-signal light (S208).

  The sub signal light output from the optical supervisory signal transmission unit is multiplexed with the main signal light and transmitted to the opposite station (S209).

  As described above, in the second embodiment, the optical channel monitoring unit 10 is configured to output display information during maintenance work during maintenance work. While receiving the display information during the maintenance work, since there is no fear of occurrence of a phenomenon affecting the device, the optical monitoring signal transmission unit 20 transmits the wavelength transmitted from the optical channel monitoring unit 10. Ignore the number information. The optical monitoring signal transmission unit 20 is configured to transmit the wavelength number information transmitted and held immediately before receiving the display information during maintenance work, that is, operated until immediately before, as the sub signal light. Yes. For this reason, even if an erroneous count of the number of wavelengths associated with the maintenance work occurs, it is not transmitted to the opposite station, so that the operation of the optical wavelength division multiplexing apparatus can be maintained normally.

  Next, a modification of the second embodiment of the present invention will be described.

  FIG. 7 is a block diagram showing a configuration of a modification of the second embodiment. In the modification of the second embodiment, the optical channel monitoring unit 10 monitors the main signal light passing through the optical amplifier 30, measures the number of wavelengths corresponding to the operating channel, and outputs the wavelength number information. In addition, a flag is added to output the wavelength number information.

  That is, the optical channel monitoring unit 10 receives the wavelength-multiplexed main signal light from the optical amplifier 30 and periodically identifies each wavelength included therein to obtain the number of wavelengths. The obtained wavelength number is held until the next identified wavelength number is obtained. The obtained wavelength number is output as wavelength number information with a flag added.

  This flag indicates whether the optical channel monitoring unit 10 is in a normal operation state or in a state where maintenance work is being performed. That is, in the normal operation state, a flag having the meaning of “valid” is added and the wavelength number information is output. Then, at the time of maintenance work of the apparatus, a flag having the meaning of “invalid” is added and wavelength number information is output. As in the second embodiment, the maintenance work is started when the active system and the standby system of the apparatus are switched, or when an explicit output instruction is received from the control apparatus (not shown) by designating the apparatus. Can be identified. Further, the end of the maintenance work can be identified by receiving an explicit stop instruction by the maintenance worker operation, as in the second embodiment.

  Wavelength number information is periodically transmitted from the optical channel monitoring unit 10 to the optical monitoring signal transmission unit 20. At that time, the optical supervisory signal transmission unit 20 identifies the flag content added to the wavelength number information, and performs reception processing of the transmitted wavelength number information.

  When the flag added to the wavelength number information is “valid”, the optical monitoring signal transmission unit 20 converts the transmitted wavelength number information into a sub signal light as an optical monitoring signal to be transmitted to the opposite station (not shown). Output. The optical supervisory signal transmission unit 20 holds the wavelength number information once transmitted until the wavelength number information with the “valid” flag is obtained next time.

  However, when the flag added to the wavelength number information is “invalid”, the optical monitoring signal transmission unit 20 ignores and discards the wavelength number information transmitted from the optical channel monitoring unit 20. Then, the optical monitoring signal transmission unit 20 converts the wavelength number information held with the “valid” flag and converts it into the sub-signal light as an optical monitoring signal for transmission.

  The optical monitoring signal transmission unit 20 continues the above operation as long as the flag added to the wavelength number information is “invalid”. When the wavelength number information with the “valid” flag is transmitted from the optical monitoring signal transmission unit 20, the wavelength number information is converted into a sub-signal light as an optical monitoring signal and output. It is held until the information on the number of wavelengths with the "" flag is obtained.

  FIG. 8 is a flowchart showing the operation of the modification of the second embodiment.

  First, the optical channel monitoring unit monitors the main signal light passing through the optical amplifier (S301), measures the number of wavelengths corresponding to the channel in operation, and outputs wavelength number information (S302).

  A flag is set in the wavelength number information according to the state of the optical channel monitoring unit.

  If the maintenance work is not in progress (S303, NO), the “valid” flag is set (S304). During maintenance work (S303, YES), an “invalid” flag is set (S305).

  The optical monitoring signal transmission unit that has received the transmission of the wavelength number information identifies the contents of the flag set in the wavelength number information.

  When the “valid” flag is set (S306, valid), the wavelength number information transmitted from the optical channel monitoring unit is output as sub-signal light (S307). When the “invalid” flag is set (S306, invalid), the optical monitoring signal transmission unit ignores the wavelength number information transmitted from the optical channel monitoring unit (S308). Then, the wavelength number information with the “valid” flag transmitted and held immediately before receiving the transmission of the wavelength number information with the “invalid” flag is output as the sub signal light (S309).

  The sub signal light output from the optical supervisory signal transmission unit is multiplexed with the main signal light and transmitted to the opposite station (S310).

  As described above, in the modification of the second embodiment, the display information during maintenance work is not output separately from the wavelength number information, but is included in the wavelength number information as a flag for displaying “valid / invalid” of the information. is doing.

  The optical channel monitoring unit 10 transmits the wavelength number information with an “invalid” flag because there is no fear of occurrence of a phenomenon that affects the device during maintenance work. When the “invalid” flag is attached to the wavelength number information, the optical supervisory signal transmission unit 20 ignores the wavelength number information transmitted from the optical channel monitoring unit 10. Then, the optical supervisory signal transmission unit 20 is operated immediately before the information with the “invalid” flag and is transmitted immediately before the information with the “valid” flag, that is, until just before, The wavelength number information is transmitted as sub signal light. For this reason, even if an erroneous count of the number of wavelengths associated with the maintenance work occurs, it is not transmitted to the opposite station, so that the operation of the optical wavelength division multiplexing apparatus can be maintained normally.

  Next, a third embodiment of the present invention will be described.

  FIG. 9 is a block diagram showing the configuration of the third exemplary embodiment of the present invention.

  In the third embodiment, the first device unit 1 in the first embodiment corresponds to the optical monitoring signal transmission unit 11 of the A station, and the second device unit 2 corresponds to the optical monitoring signal transmission unit 21 of the B station. Equivalent to.

  In the third embodiment, the optical supervisory signal transmission unit 11 of the A station sends the wavelength number information, which is the number of main signal optical channels operated by the optical amplifier 41 of the A station, to the optical supervisory signal transmission unit 21 of the B station. Send. The optical supervisory signal transmission unit 21 of the B station notifies the optical number 71 of the received wavelength information to the optical amplifier 71 of the B station, thereby performing amplification control in the optical amplifier 71 of the B station.

  The wavelength number information used in the optical amplifier 41 of station A is counted by the optical channel monitoring unit 31 and transmitted to the optical monitoring signal transmission unit 11 as described in the second embodiment. The optical supervisory signal transmission unit 11 of the A station converts the wavelength number information transmitted to the optical supervisory signal transmission unit 21 of the B station into sub-signal light based on the information transmitted from the optical channel monitoring unit 31 and transmits it. . The sub signal light is multiplexed together with the main signal light that has passed through the optical amplifier 41 in the multiplexer 51 of the A station, and sent out to the optical fiber transmission line.

  In the B station, the sub-signal light demultiplexed from the main signal light by the demultiplexer 61 is received by the optical supervisory signal transmission unit 21 of the B station. Then, the information on the number of wavelengths included in the received sub signal light is sent to the optical amplifier 71 of the B station. In the optical supervisory signal transmission unit 21 of the B station, the wavelength number information obtained once is held until the wavelength number information is obtained next time.

  In the state as described above, when maintenance work is performed on the optical monitoring signal transmission unit 11 of the A station, the optical monitoring signal transmission unit 11 of the A station outputs a pseudo alarm during the maintenance work of the apparatus. This pseudo alarm is equivalent to the display information during maintenance work described in the first embodiment and the second embodiment. Therefore, this pseudo alarm is output when the active system and the standby system of the device are switched, or when the device is specified and an explicit output instruction is received from a control device (not shown). . Further, the output is stopped when an explicit stop instruction is received from a control device (not shown) or a control operation panel of the device by a maintenance worker operation.

  When maintenance work is performed on the optical monitoring signal transmission unit 11 of the A station, there is no possibility that dust data is mixed in the sub signal light. Therefore, the optical monitoring signal transmission unit 21 of the B station ignores the information of the sub signal light while receiving the pseudo alarm from the optical monitoring signal transmission unit 11 of the A station. Instead, the optical supervisory signal transmission unit 21 of the B station uses the wavelength number information transmitted and held immediately before receiving the pseudo alarm as notification information to the optical amplifier 71.

  In this way, the optical supervisory signal transmission unit 21 of the B station receives information on the sub signal light received from the optical supervisory signal transmission unit 11 of the A station as long as it receives a pseudo alarm from the optical supervisory signal transmission unit 11 of the A station. And the above-described operation using the held wavelength number information is executed.

  When the maintenance work in the optical monitoring signal transmission unit 11 of the A station is completed, the output of the pseudo alarm is stopped, so that the optical monitoring signal transmission unit 21 of the B station receives the optical monitoring signal transmission unit 11 of the A station. Information on the sub signal light is used as notification information to the optical amplifier 71.

  FIG. 10 is a flowchart showing the operation of the third embodiment.

  First, the number-of-wavelength information is received from the optical channel monitoring unit by the optical monitoring signal transmission unit of station A (S401). Then, the wavelength number information is converted into sub-signal light and output (S402).

  During maintenance work of the optical monitoring signal transmission unit of station A (S403, YES), a pseudo alarm is output (S404).

  The optical monitoring signal transmission unit of the B station that has received the sub signal light from the optical monitoring signal transmission unit of the A station does not receive the pseudo alarm from the optical monitoring signal transmission unit of the A station (NO in S405). Obtains information on the number of wavelengths of sub-signal light received from the optical supervisory signal transmission unit of station A (S406).

  In addition, during reception of a pseudo alarm from the optical monitoring signal transmission unit of the A station (S405, YES), the optical monitoring signal transmission unit of the B station transmits the sub signal light received from the optical monitoring signal transmission unit of the A station. The wavelength number information is ignored (S407). Then, the information on the number of wavelengths transmitted and held immediately before receiving the pseudo alarm is obtained (S408).

  The optical supervisory signal transmitter of the B station notifies the optical amplifier 71 of the B station of the wavelength number information obtained above (S409).

  Thus, in the third embodiment, the optical monitoring signal transmission unit 11 of the station A is configured to output a pseudo alarm during maintenance work. And while receiving this pseudo alarm, there is no concern that the phenomenon affecting the device or the generation of garbage data will occur. Therefore, the optical monitoring signal transmission unit 21 of the B station transmits the optical monitoring signal of the A station. The information on the sub signal light received from the unit 11 is ignored. Then, the optical supervisory signal transmission unit 21 of the B station is configured to notify the optical amplifier 71 of the wavelength number information of the sub signal light that has been received immediately before receiving the pseudo alarm, that is, operated until immediately before. Yes. Therefore, even if garbage data is generated due to maintenance work of the optical monitoring signal transmission unit 11 of the A station, it is not transmitted from the optical monitoring signal transmission unit 21 of the B station to the optical amplifier 71. The operation of the communication device can be maintained normally.

  In the third embodiment as well, as described in the modification of the second embodiment, instead of transmitting a pseudo alarm, wavelength number information to which a valid flag or invalid flag is added is transmitted by sub-signal light. You may do it.

  Next, a fourth embodiment of the present invention will be described.

  FIG. 11 is a block diagram showing the configuration of the fourth exemplary embodiment of the present invention.

  In the fourth embodiment, the first device unit 1 in the first embodiment corresponds to the optical amplifier 12, and the second device unit 2 corresponds to the optical channel monitoring unit 22.

  In the fourth embodiment, as described in the second embodiment, the optical channel monitoring unit 22 monitors the main signal light passing through the optical amplifier 12 and measures the number of wavelengths corresponding to the channel in operation. To output wavelength information. The number-of-wavelength information output from the optical channel monitoring unit 22 is received by the optical monitoring signal transmission unit 32, converted into sub-signal light that is an optical monitoring signal, and output. The sub signal light output from the optical supervisory signal transmission unit 32 is multiplexed with the main signal light amplified by the optical amplifier 12 and transmitted to the opposite station.

  That is, the optical channel monitoring unit 22 receives the wavelength-multiplexed main signal light from the optical amplifier 12 and periodically identifies each wavelength included therein to obtain the number of wavelengths. The obtained wavelength number is held until the next identified wavelength number is obtained. The obtained wavelength number is output as wavelength number information.

  In the fourth embodiment, control during maintenance work for the optical amplifier 12 will be described.

  The optical amplifier 12 in which the maintenance work is performed outputs a pseudo alarm as information indicating that the maintenance work is being performed. In other words, this pseudo alarm is equivalent to the display information during maintenance work described in the first embodiment or the second embodiment. Therefore, this pseudo alarm is output and stopped under the same conditions as those described in the second embodiment and the third embodiment.

  When maintenance work is being performed on the optical amplifier 12, there is no possibility that dust data will be mixed into the monitor light. That is, during the maintenance work of the optical amplifier 12, there is a concern that the optical channel monitoring unit 22 erroneously counts the number of wavelengths included in the main signal light being monitored. Therefore, while receiving the pseudo alarm from the optical amplifier 12, the optical channel monitoring unit 22 ignores the count data even when performing the wavelength count using the monitor light. Instead, the optical channel monitoring unit 22 uses the wavelength number information counted and held immediately before receiving the pseudo alarm as transmission information to the optical monitoring signal transmission unit 32.

  As described above, as long as the optical channel monitoring unit 22 receives a pseudo alarm from the optical amplifier 12, even if the wavelength number is counted using the monitor light, the count data is ignored and held. The above operation using information is executed.

  When the maintenance work in the optical amplifier 12 is completed, the output of the pseudo alarm is stopped, so that the optical channel monitoring unit 22 uses the wavelength number information based on the number of wavelengths counted from the monitor light, and the optical monitoring signal transmission unit 32. Information to send to.

  FIG. 12 is a flowchart showing the operation of the fourth embodiment.

  At the time of maintenance work (S501, YES), the optical amplifier outputs a pseudo alarm (S502).

  The optical channel monitoring unit monitors the main signal light of the optical amplifier, and counts the number of wavelengths that is the number of operating channels in the main signal (S503).

  The optical channel monitoring unit uses the number of wavelengths counted by monitoring the main signal light for transmission information in a normal time (S504, NO) when no pseudo alarm is received from the optical amplifier (S505).

  Further, during reception of a pseudo alarm from the optical amplifier (S504, YES), the optical channel monitoring unit ignores the number of wavelengths counted by monitoring the main signal light (S506). Then, counting is performed immediately before receiving the pseudo alarm, and the number of wavelengths held is used as transmission information (S507).

  The optical channel monitoring unit transmits the number of wavelengths obtained above as wavelength number information to the optical monitoring signal transmission unit (S508).

  Thus, in the fourth embodiment, the optical amplifier 12 is configured to output a pseudo alarm during maintenance work. During the reception of this pseudo alarm, there is no concern that a phenomenon affecting the device or the generation of garbage data will occur. Ignore the number of wavelengths counted from. The optical channel monitoring unit 22 counts and holds the pseudo alarm immediately before receiving it, that is, the wavelength channel that has been operated until immediately before is transmitted to the optical monitoring signal transmission unit 32 as wavelength number information. It has become. For this reason, even if dust data associated with the maintenance work of the optical amplifier 12 is generated, it is not transmitted to the succeeding devices after the optical channel monitoring unit 22, so that the operation of the optical wavelength division multiplexing apparatus is normally maintained. be able to.

DESCRIPTION OF SYMBOLS 1 1st apparatus part 2 2nd apparatus part 101,204 Multiplexer 12, 30, 41, 71, 102, 105, 202, 205 Optical amplifier 51, 103, 206 Multiplexer 61, 104, 201 Demultiplexer 106, 203 Separation unit 10, 22, 31, 110, 210 Optical channel monitoring unit 11, 20, 21, 32, 120, 220 Optical monitoring signal transmission unit 151 Transmission circuit 152 Optical multiplexing circuit 250 Optical demultiplexing circuit 251 Reception circuit

Claims (8)

A first device unit that outputs operation information related to operation and outputs maintenance-in-progress display information during maintenance work;
When the maintenance information is received from the first device unit and is received from the first device unit, the operation information is transmitted from the first device unit. A second device unit for ignoring the received operation information and outputting the operation information transmitted and held immediately before receiving the display information during maintenance work;
An optical supervisory control system for an optical wavelength division multiplexing communication apparatus. The first device unit is an optical channel monitoring unit that monitors main signal light passing through an optical amplifier, measures the number of wavelengths corresponding to an operating channel, and outputs wavelength number information of the measured number of wavelengths. There,
The second apparatus unit is an optical monitoring signal transmission unit that transmits the wavelength number information transmitted from the optical channel monitoring unit as a sub-signal light to an opposite station, and the optical monitoring signal transmission unit includes the optical monitoring signal transmission unit. When receiving the maintenance-in-progress display information from the channel monitoring unit, the wavelength number information transmitted from the optical channel monitoring unit is ignored and transmitted and held immediately before receiving the maintenance-indication display information. 2. The optical supervisory control method for an optical wavelength division multiplexing apparatus according to claim 1, wherein the wavelength number information is transmitted as sub-signal light. The first device unit transmits the wavelength number information transmitted from the optical channel monitoring unit that measures the number of wavelengths of the main signal light passing through the first optical amplifier to the opposite station as sub signal light. An optical monitoring signal transmission unit,
The second apparatus unit is configured to notify the second optical amplifier of the wavelength number information included in the sub signal light received from the first optical monitoring signal transmission unit. A transmission unit that receives the maintenance-in-progress display information from the first optical monitoring signal transmission unit, the second optical monitoring signal transmission unit from the first optical monitoring signal transmission unit; Ignoring the wavelength number information included in the received sub-signal light, and notifying the second optical amplifier of the wavelength number information transmitted and held immediately before receiving the display information during maintenance work. The optical supervisory control system for an optical wavelength division multiplexing communication apparatus according to claim 1, wherein The first device unit is an optical amplifier that amplifies and outputs wavelength-multiplexed main signal light,
The second device section monitors the main signal light passing through the optical amplifier, measures the number of wavelengths corresponding to the channel in operation, and outputs wavelength number information of the measured number of wavelengths. The optical channel monitoring unit ignores the number of wavelengths measured by monitoring the main signal light when receiving the maintenance-in-progress display information from the optical amplifier, and performing the maintenance operation. The optical monitoring and control method for an optical wavelength division multiplexing apparatus according to claim 1, wherein the number of wavelengths measured and held immediately before receiving display information is output as the wavelength number information. In the first device section, output operation information related to operation,
Outputting maintenance-in-progress display information during maintenance work of the first device unit;
In the second device unit arranged behind the first device unit, the operation information is transmitted from the first device unit,
When the display information during maintenance work is received from the first device unit, the operation information transmitted from the first device unit is ignored and transmitted immediately before the display information during maintenance work is received. And outputting the operation information that has been held, and an optical monitoring control method for an optical wavelength division multiplexing communication apparatus. The first device unit is an optical channel monitoring unit that monitors main signal light passing through an optical amplifier, measures the number of wavelengths corresponding to an operating channel, and outputs wavelength number information of the measured number of wavelengths. The second apparatus unit is an optical monitoring signal transmission unit that transmits the wavelength number information transmitted from the optical channel monitoring unit to the opposite station as a sub signal light, and the optical monitoring signal transmission unit ,
When receiving the maintenance-in-progress display information from the optical channel monitoring unit, the wavelength number information transmitted from the optical channel monitoring unit is ignored and transmitted and held immediately before receiving the maintenance-indication display information. 6. The optical supervisory control method for an optical wavelength division multiplexing communication apparatus according to claim 5, wherein the information on the number of wavelengths is transmitted as sub-signal light. The first device unit transmits the wavelength number information transmitted from the optical channel monitoring unit that measures the number of wavelengths of the main signal light passing through the first optical amplifier to the opposite station as sub signal light. The optical monitoring signal transmission unit, wherein the second device unit notifies the second optical amplifier of the wavelength number information included in the sub signal light received from the first optical monitoring signal transmission unit. A second optical supervisory signal transmitter of the opposite station, wherein the second optical supervisory signal transmitter is
When receiving the maintenance-in-progress display information from the first optical monitoring signal transmission unit, ignore the wavelength number information included in the sub-signal light received from the first optical monitoring signal transmission unit, 6. The optical monitoring of an optical wavelength division multiplexing apparatus according to claim 5, wherein the second optical amplifier is notified of the wavelength number information transmitted and held immediately before receiving the display information during the maintenance work. Control method. The first device unit is an optical amplifier that amplifies and outputs wavelength-multiplexed main signal light, and the second device unit monitors and operates the main signal light passing through the optical amplifier. An optical channel monitoring unit that measures the number of wavelengths corresponding to a channel in the middle and outputs wavelength number information of the measured number of wavelengths, the optical channel monitoring unit,
When the display information during maintenance work is received from the optical amplifier, the number of wavelengths measured by monitoring the main signal light is ignored, and measured and held immediately before the display information during maintenance work is received. 6. The optical supervisory control method for an optical wavelength division multiplexing apparatus according to claim 5, wherein the wavelength number is output as the wavelength number information.

Images