JP2004312762A - Optical communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a signal management system capable of high-speed fault recovery at low costs by eliminating a complicated logic circuit for specifying a location of a fault in a wavelength multiplexed network. <P>SOLUTION: As a form of an optical signal to be transmitted, an optical signal form provided with a region for managing the quality of optical transmission, namely, provided with an optical transmission management byte therein is used. A parity of the transmitting signal is stored in the optical transmission management byte. The transmitted optical signal is inputted to a photoelectric transduction part 101 and inputted to an optical transmission management byte terminating part 103 after applying 3R processing thereto in a 3R processing part 102. The parity stored in the transmitted optical transmission management byte is compared with a parity of a received signal to calculate the number of bit errors and a bit error rate. In order to calculate the bit error rate in the next node, before subsequent optical transmission to the other node, the parity of the signal is calculated in an optical transmission byte generating part, and the result is stored in the optical transmission management byte. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical communication device.

  In order to respond to the demand for large-capacity communication, an optical communication network employs means for increasing the capacity in one optical transmission line by performing wavelength multiplexing. Hereinafter, when the end between signals in wavelength units whose contents do not change is defined as an optical path (between a client and a client of an optical network), various nodes are set as a start node and an end node in one optical transmission line. There will be a plurality of optical paths. Hereinafter, such a network is referred to as a lightwave network.

  In a lightwave network, when a fault occurs in an optical path, it is necessary to quickly identify a fault location in order to quickly recover from the fault. Conventionally, as an optical path monitoring method, it has been proposed to monitor an error rate of a signal obtained by splitting a signal at a node in the middle (Okamoto: "NNI configuration of WDM optical path transmission network", 1997 Institute of Electronics, Information and Communication Engineers) Society Conference, B-10-98). This will be described with reference to FIG. In FIG. 7, reference numerals 701 and 704 denote optical path terminators, and 702 and 703 denote 3R regeneration repeaters. 3R reproduction means equivalent amplification, discrimination reproduction, and retiming. The 3R reproduction repeater can return a deteriorated signal-to-noise ratio or a deteriorated waveform to a digitally clear state. FIG. 7 is a diagram focusing on an optical path of a certain wavelength out of a plurality of wavelengths. Actually, a wavelength multiplexing device and a wavelength multiplexing / demultiplexing device are present at each node, and each 3R regenerative repeater is A signal in a state where it is wavelength-multiplexed and demultiplexed in units of one wave by the wavelength division multiplexer is input, and the output optical signal is wavelength-multiplexed by the wavelength multiplexer and transmitted to another node. The B3 'byte is defined to measure the error rate of the optical path, and as shown in FIG. 7, the 3R regeneration repeaters 702 and 703 in the middle of the optical path branch the main signal and monitor the B3' byte. By doing so, the error rate from the optical path terminating device 701, which is the starting point of the optical path, to the 3R regenerative repeaters 702 and 703 was measured to monitor the optical signal.

  FIG. 8 shows the configuration of a 3R regenerative repeater 800 using the conventional technique. The same configuration can be applied to 702 and 703. In FIG. 8, reference numeral 801 denotes a photoelectric conversion unit, which converts an input optical signal into an electric signal. Reference numeral 802 denotes a 3R processing unit that extracts a clock from an input signal and performs 3R reproduction. Reference numeral 803 denotes a main signal branch unit, which transmits one in the direction in which the main signal is to be transmitted, and connects the other to the optical path termination unit 804. By monitoring the B3 'byte in 804, it is possible to monitor the bit error rate from the node 701, which is the starting point of the optical path, to the point 703. More specifically, parity (for example, if the number of bits having a value of 1 is odd: 1; if the number of bits having a value of 1 is even: 0) is previously inserted into the B3 ′ byte at the node serving as the starting point of the optical path, Parity is recalculated on the receiving side, multiple determinations are made on whether the parity that should have been sent on the transmitting side and the parity on the receiving side match, the number of bit errors within a certain time is calculated, and the bit error rate is calculated I do.

  When the 3R regenerative repeaters 702 and 703 are in the middle of the optical path, it is assumed that the optical path terminating device 704 has detected the deterioration of the bit error rate of the optical path. In this case, the optical path terminating device 704 determines whether a failure has occurred before the optical path terminating device 704, a failure has occurred before the 3R regenerative repeater 703, or has occurred before the 3R regenerative repeater 702. For the determination, a method is used in which the error rate in the 3R regenerative repeater 702 is compared with the error rate in the 3R regenerative repeater 703, and the fault point is determined by comparing the error rates. For example, assuming that the optical path guarantees transmission of a bit error rate: 10−10, if a failure occurs immediately before the 3R regenerator 703, the bit error rate at each node becomes 3R regenerator 702. , The bit error rate at the 3R regenerator 703 is 0.5, and the bit error rate at the optical path terminating device 704 is 0.5. Here, when the bit error rate is 0.5, a bit is erroneously detected at half the probability, and a signal is not transmitted normally at all. Since the bit error rate of the 3R regenerator 703 is 0.5 and the bit error rate of the preceding 3R regenerator 702 is 10-10, it means that a failure has occurred in the section immediately before the 3R regenerator 703. Understand. Similarly, for example, the bit error rate in the 3R regenerator 702 is 0.5, the bit error rate in the 3R regenerator 703 is 0.5, and the bit error rate in the optical path terminating device 704 is 0.5. In this case, it can be understood that the failure has occurred before the 3R regeneration repeater 702.

By using the configuration described above, it is possible to monitor the optical path in the middle.
Okamoto: "NNI configuration of WDM optical path transmission network", 1997 IEICE Society Conference, B-10-98. Bellcore document GR-253-CORE, Issue 2, December 1995 A. Hirano et al., "An All-optical signal discriminator: application to 2.4 Gb / s all-optical regeneration and 20 Gb / s demultiplexing," in proc. Of OECC '96, 18B4-3, pp.342-343, 1996 .

  Since the optical path terminating device 704 is a terminal node of the optical path, it detects a failure in the optical path. However, in order to recover from the failure, it is necessary to quickly know where the failure has occurred. However, using the method of the related art, it is necessary to collect information on the bit error rates of a plurality of optical communication devices existing in an optical path section in order to know whether a failure has occurred in a certain section. Hereinafter, description will be made with reference to FIG. If the optical path terminating device 704 wants to know whether a failure has occurred in the section between the 3R regenerative repeater 702 and the 3R regenerative repeater 702, the optical path terminating device 704 needs to know information on both bit error rates. . As described in the description of the related art, since it is not possible to directly know the state of the section, a complicated logic circuit that compares the bit error rates of nodes in the middle of each optical path and specifies the position of a fault is necessary. In addition, it takes time to know information from a plurality of nodes in the middle of the optical path, and it is necessary to use a band for the communication.

  SUMMARY OF THE INVENTION An object of the present invention is to construct a signal quality management system capable of realizing high-speed fault recovery at lower cost by eliminating complicated logic circuits for specifying a fault location in a wavelength division multiplexing network. Further, in order to know whether or not a failure has occurred in a certain section, it is necessary to know information from a plurality of nodes in the middle of the optical path, but this time is reduced and the communication band for that is reduced. Accordingly, an object of the present invention is to construct a signal quality management system capable of realizing high-speed failure recovery at lower cost.

  A first aspect of the present invention is an optical communication apparatus, which includes means for performing 3R regeneration relay of an optical signal, means for monitoring signal quality in a preceding 3R regeneration relay section, and switching of input signals and processing of management information. A signal processing switching unit for performing information processing, a unit for adding information so that signal quality can be monitored in an optical communication device for performing 3R reproduction at the next stage, and a unit for processing network control management information. One or more optical signals demultiplexed from the optical signal demultiplexing system are input to means for performing 3R regeneration relay of the optical signal, and the means for monitoring the signal quality monitors the quality of the input optical signal. The means for adding the information adds information to the input signal so that the quality of the optical signal can be managed in the optical communication device that performs 3R reproduction at the next stage, and the signal with the information is singular or plural Means for processing the network control management information output to the signal multiplexing system, receiving the signal quality information of the input optical signal from the signal quality monitoring means, and the signal processing switching means; It is characterized by exchanging network control management information with another optical communication device.

  A second aspect of the present invention is an optical communication apparatus, which includes means for performing 3R reproduction of an optical signal, means for monitoring signal quality in a 3R reproduction relay section, and signal processing for switching an input signal and processing management information. A switching unit and a unit for processing network control management information, wherein one or a plurality of optical signals demultiplexed from one or a plurality of optical signal demultiplexing systems are input to a unit for performing 3R reproduction of the optical signal. The means for monitoring the signal quality of the 3R regeneration relay section monitors the quality of the input optical signal, and the means for processing the control management information of the network includes the means for monitoring the signal quality from the means for monitoring the signal quality. Receiving signal quality information of the received optical signal, and exchanging network control management information with the signal processing switching means and other optical communication devices.

  A third invention is an optical communication device, which can monitor signal quality in a signal processing switching means for switching an input signal and processing management information and an optical communication device for performing 3R reproduction at the next stage. And a means for processing network control management information. A signal is input to the signal processing switching means, and the information adding means is an optical communication device that performs 3R reproduction at the next stage. Means for adding information to the input signal so that the quality of the optical signal can be managed, the signal with the information added is output to one or more optical signal multiplexing systems, and the means for processing the control management information of the network is And transmitting and receiving network control management information to and from the signal processing switching means and other optical communication devices.

  A fourth aspect of the present invention is the optical communication apparatus according to claim 1, 2, or 3, wherein the optical signal multiplexing / demultiplexing system and the optical signal multiplexing system are wavelength multiplexing systems.

  A fifth aspect of the present invention is the optical communication apparatus according to claim 4, wherein: means for generating and terminating the wavelength; and means for monitoring the quality of the optical signal terminated by the means for generating and terminating the wavelength. Wherein the means for monitoring the quality of the optical signal is connected to the means for processing the control management information of the network.

  A sixth invention is an optical communication apparatus in an optical signal multiplexing system, wherein an optical signal of a type having an area for storing information for monitoring the signal quality of a 3R regeneration relay section is input / output. And

  A seventh invention is an optical communication device in a wavelength division multiplexing system, wherein quality information of a wavelength of a transmission signal is stored in a signal, a signal is transmitted, and the quality information of the wavelength stored in a reception signal is stored in the reception signal. The quality of the received signal is monitored from the quality information of the wavelength of the received signal.

  Hereinafter, the operation of the present invention will be described. Originally, by performing 3R regeneration relay, it is possible to measure the bit error rate. Therefore, in the wavelength multiplexing system, an area for storing a parity for calculating the bit error rate of the 3R regeneration relay section in the signal frame is time-multiplexed with the main signal. In an optical communication device having a 3R regenerative relay function, it is possible to calculate the bit error rate by counting the number of erroneous bits by comparing the parity transmitted from the preceding optical communication device with the received parity. is there. Before sending the optical signal to the next optical communication device having the 3R regeneration relay function, the current parity is re-entered to eliminate the correlation with the bit error rate up to the previous stage. In addition, the wavelength to be transmitted is time-multiplexed with the main signal and transmitted, and the value of the transmitted wavelength and the value of the transmitted wavelength are compared on the receiving side to check whether the signal is transmitted as desired. I do. With the above operation, it is possible to manage the signal quality of the optical transmission section.

  By applying the present invention, it is possible to eliminate a complicated logic circuit for specifying a fault location in a wavelength division multiplexing network. In addition, when it is desired to know whether a fault has occurred in a section of the optical path, the time to know information from a plurality of nodes in the middle of the optical path is reduced, and the communication band for that is reduced. A signal quality management system that can realize high-speed failure recovery at lower cost can be constructed.

  Next, embodiments of the present invention will be described with reference to the drawings. The 3R regeneration repeater section refers to a section between adjacent 3R regeneration repeaters. Generation of a wavelength refers to a case where a certain wavelength is newly generated. For example, when converting from an electrical signal to an optical signal, a wavelength will be generated. Terminating a wavelength refers to not using the generated light of a certain wavelength. Therefore, when a certain optical signal is input to the optical receiver and converted into an electric signal, the termination of the wavelength occurs.

  An optical signal having a format as shown by 300 in FIG. 3 is used as a single-wave optical signal to be subjected to wavelength multiplexing. In FIG. 3, the signal time progresses from left to right, and each divided area is composed of a plurality of bit strings. An overhead for control management is added in time multiplex before a main signal area in which information of the main signal is stored. In the first byte, a bit pattern (frame synchronization bit string in the figure) for synchronizing the signal is inserted, and in the second byte, a parity bit (bit) for calculating the bit error rate for each 3R reproduction relay section is set. In the figure, an optical transmission management byte is arranged, and in the third byte, a parity bit for calculating the bit error rate in the end section of the optical path is arranged (in the figure, the optical path monitoring control information area). Details of a method of calculating the number of error bits and the bit error rate by transmitting the parity bits are described in, for example, Bellcore document GR-253-CORE, Issue 2, December 1995. The main signal data signal is arranged behind the area where the control management information is stored (main signal data area).

  FIG. 1 shows the configuration of the 3R regeneration relay device. 100 is a 3R regeneration repeater, 101 is a photoelectric conversion unit, 102 is a 3R processing unit, 103 is an optical transmission management byte termination unit, 104 is a signal processing switching unit, 105 is an optical transmission management byte generation unit, 106 is a photoelectric conversion unit, Reference numeral 107 denotes a device that processes network control management information. Hereinafter, photoelectric conversion refers to both the case of conversion from light to electricity and the case of conversion from electricity to light. 101 is a conversion from light to electricity because it is on the input side, and 106 is a conversion from electricity to light because it is on the output side. The 3R processing unit 102 extracts a clock from the input signal, and reproduces bits of the data signal based on the clock. In step 102, a frame synchronization bit string having a signal format 300 is detected, and frame synchronization is performed.

  In FIG. 1, the 3R processing unit is described at the position 102, but there may be a case where the other parts have the 3R processing function. For example, assuming that the function of each block is realized by a digital LSI, the output of the digital LSI has only two values, ie, a voltage corresponding to 0 or a voltage corresponding to 1, so that the digital LSI originally has Has a 2R (equalization amplification, discrimination reproduction) function just by passing through. Therefore, if a clock is extracted, the clock is distributed to the digital LSI of each subsequent block, and the LSI is driven by the clock, not only the originally provided 2R function but also the retiming function is provided. In the end, 3R processing is performed. That is, the 3R processing unit may include the entirety of another LSI to which another clock is distributed without pointing to only one location 102. The optical transmission management byte processing unit 103 extracts the optical transmission management byte of the signal format 300 (the byte next to the frame synchronization byte), compares the obtained parity with the actually transmitted parity, and determines the number of erroneous bits. , The bit error rate is calculated, and the optical transmission section is managed. In the case of the 3R regenerative repeater, the signal processing switching unit 104 has only an input and an output connected as shown in FIG. 2, and does not have a special function such as a switching function. The optical transmission management byte generation unit 105 calculates the parity of a signal to be newly transmitted to calculate the error rate at the next node, and stores the parity in the optical transmission management byte of the signal format 300. The photoelectric conversion unit 106 converts the input electric signal into an optical signal having a desired wavelength. Although not shown in FIG. 1, the output of the photoelectric conversion unit 106 is wavelength-multiplexed and then transmitted to another node. The control management information processing device 107 has means for transferring information to another node. As a means therefor, a method using a different wavelength from the main signal light can be used. In addition, it is possible to superimpose on the main signal light by time multiplexing. The control management information processing device 107 transfers the bit error rate obtained by the optical transmission management byte termination unit to another node in response to a request from another node.

  A second embodiment will be described with reference to FIG. An optical communication device 400 has a plurality of input / output terminals and has a switching function. Reference numerals 401 and 407 denote photoelectric conversion units for converting an input optical signal into an electric signal, 402 and 408 denote 3R processing units, 403 and 409 denote optical transmission management byte termination units, 404 denotes a signal processing switching unit, and 405 and 410 denote optical signals. A transmission management byte generation unit, 406 and 411 are photoelectric conversion units, and 412 is a device that processes network control management information. Except for the signal processing switching unit 404, each has the same function as the block of the same name in FIG. The signal processing switching unit is a 2 × 2 switch, and can perform failure recovery by switching the switch at the time of failure recovery or the like. The 2 × 2 switch may be an electric switch for switching an electric signal or an optical switch.

  A third embodiment will be described with reference to FIG. Reference numeral 500 denotes an optical communication device when the optical path does not pass and is terminated. Reference numeral 501 denotes a photoelectric conversion unit, 502 denotes a 3R processing unit, 503 denotes an optical transmission management byte termination unit, 504 denotes a signal processing switching unit, and 505 denotes a device that performs network control management information processing. The components other than the signal processing switching unit 504 have the same functions as the components having the same names in the first embodiment. By comparing the parity result obtained by the optical transmission management byte termination unit 503 with the actual parity obtained at the node, it is possible to know the transmission quality (bit error rate) of the section from the immediately preceding 3R termination node. is there.

  In addition, the signal processing switching unit 504 calculates parity for the optical path from the optical path monitoring control information area in the optical signal format 300, and uses the same method as the method for calculating the bit error rate obtained in the optical transmission management byte. , Information on the error rate of the optical path can be obtained. By notifying this to the control management information processing device 505, the network control management system knows whether the optical path has been transmitted without error. The network control management system may be connected to the optical communication device 500 or may exist in another node. When the information is present in another node, information on the error rate of the optical path is transmitted by the function of transmitting the control management information of the network to the other node provided in the control management information processing apparatus.

  If only the optical path is terminated as shown in FIG. 5, the signal processing switching unit 504 does not have a switching function, and the signal output from the signal processing switching unit 504 is transmitted to another network device (in FIG. Is not described). Only the optical path quality information is transmitted to another node for notification.

  When the optical communication device 500 has a failure recovery function, the signal processing switching unit 504 has a switching function and switches the switches in the 504 based on the information on the error rate of the optical path obtained by the signal processing switching unit 504. Perform fault recovery.

  A fourth embodiment will be described with reference to FIG. Reference numeral 600 denotes an optical communication device that does not pass through the optical path and serves as a starting point of the optical path. Reference numeral 601 denotes a signal processing switching unit, 602 denotes an optical transmission management byte termination unit, 603 denotes a photoelectric conversion unit, and 604 denotes a device that performs network control management information processing. The components other than the signal processing switching unit 601 have the same functions as the components having the same names in the first embodiment. The signal processing switching unit 601 stores the parity in the optical path monitoring control information area in the optical signal format 300 so that the error rate of the optical path can be calculated at the terminal node of the optical path. The control management information processing device 604 can know whether or not the optical path has been transmitted without error, based on the notification of the management control information from another node. The network control management system may be connected to the optical communication device 600 or may exist in another node. If it exists in another node, information related to the error rate of the optical path is transmitted / received by a function of the control / management information processing apparatus 604 that transmits the control / management information of the network to the other node.

  As shown in FIG. 6, if only the optical path is terminated (the start point of the optical path), the signal processing switching unit 601 does not have a switching function. A signal output from another network device (not shown in FIG. 6) is input to the signal processing switching unit 601.

  When the optical communication device 600 has a failure recovery function, the signal processing switching unit 601 has a switching function, and the control management information processing device 604 obtains an optical path switching request from another node. Switch to perform fault recovery.

  As described above, the first to fourth embodiments have been described. As a result, in a wavelength division multiplexing network, there is no need to provide a complicated logic circuit for specifying a fault location, and the cost is reduced. Further, when it is desired to know whether or not a failure has occurred in a 3R regeneration relay section having an optical path, the 3R regeneration relay section obtained by referring to the optical transmission management byte of the node at the end of that section (FIG. By referring to the bit error rate of the optical transmission section, the bit error rate of that section can be determined. That is, the bit error rate of a certain section can be determined by accessing only one location. Compared to the case of using the conventional technology, the time to know information from multiple nodes along the optical path is reduced, and the communication bandwidth for that is reduced, enabling faster failure recovery at lower cost. A simple signal quality management system.

  For example, in the case of using a failure recovery method that bypasses only a failure section, if a conventional technique is used, whether a failure has occurred in the 3R regeneration relay section immediately before the node where the failure has been detected, or in a 3R regeneration relay section earlier than that. It is not possible to determine whether a failure has occurred based on only the information of the node where the failure has been detected, but it is necessary to determine the failed section by accessing a plurality of nodes, and then to bypass only the failed section. And it was necessary to perform failure recovery. However, according to the present invention, a faulty section can be directly detected at a node adjacent to a faulty point. Therefore, a fault recovery operation is started from a node closest to the faulty point, and a detour that bypasses only the faulty section is configured. It is possible to do. Therefore, the operation for determining the fault section is not required, and the fault can be recovered at high speed.

  The fifth embodiment will be described below. Although the method of monitoring the bit error rate is used as the monitoring of the optical transmission section, the method of monitoring the optical power in the wavelength generation / termination section is used. Since the 3R regeneration relay section involves optical-electrical conversion, it is always a wavelength generation / termination section. This can be realized by installing a photodiode at the input terminal of the wavelength termination node and monitoring the photocurrent. The monitoring of the wavelength generation / termination section may be used together with the monitoring of the bit error rate as described in the first to fourth embodiments. Also, in the case of a configuration in which the wavelength is converted into a different wavelength for each optical transmission section in the middle of the optical path and transmitted, the bit error rate and whether or not the wavelength is the desired wavelength is managed for each optical transmission section. . For example, the wavelength currently being transmitted is stored in a certain control management information area (an area other than the main signal data area in FIG. 3), and the wavelength of the received light obtained by using the optical wavemeter on the receiving side is compared with the wavelength. By comparing the stored wavelengths, it is checked whether the wavelengths have been transmitted without shifting.

  In the fifth embodiment, the monitoring of the optical power and the wavelength is performed. However, the monitoring of the S / N (signal-to-noise ratio) of the light can also be applied. By determining the ratio between ASE (spontaneous emission noise) and signal light, it is possible to determine the S / N of light for each wavelength.

  By using the fifth embodiment, a complicated logic circuit, which is indispensable in the configuration using the prior art, becomes unnecessary, and the same effects as those described in the first to fourth embodiments are obtained. . Monitoring the quality of light, such as optical power, has the advantage that it is not necessary to transmit the parity by time-multiplexing the main signal. Also, whether the optical signal is a 2.5 Gb / s optical signal or a 10 Gb / s optical signal, the quality of the optical signal can be monitored (that is, independent of the bit rate and signal format). ), High flexibility.

  In the embodiment of the present invention, a frame structure is used as a method of transferring a control signal to another node, and a frame synchronization bit string is a first byte, an optical transmission management byte is a second byte, and an optical path monitoring control information is a third byte. Although the area and the subsequent areas are allocated as main signal data areas, it is obvious that the present invention can be implemented even if they are not the same. For example, the information amount of the optical transmission management byte does not need to be 1 byte, and the arrangement may not be in the second byte. It is also possible to use overhead bytes such as SDH and SONET (see Bellcore document GR-253-CORE, Issue 2, December 1995).

  Further, the present invention can be implemented by using message-oriented communication (communication using a command) without assigning information to bits or bytes. It is also possible to use packet communication, frame relay, or communication using ATM.

  In the embodiment of the present invention, the optical transmission management information is superimposed on the main signal by time multiplexing, but it is obvious that any medium that can transfer the control information can be applied as the control signal transfer means. For example, it is obvious that the present invention can be applied even if control information is exchanged between nodes using a system in which a wavelength different from the main signal, a radio signal, or a subcarrier is superimposed on an optical signal and transmitted. .

  In the embodiment of the present invention, a 2 × 2 switch is used as a switch of the signal processing switching unit, but it is obvious that the switch scale is not limited to this.

  In the embodiment of the present invention, the case where the wavelength multiplexing technique is applied as the optical multiplexing technique has been examined. However, the present invention can be implemented by applying other multiplexing techniques such as polarization multiplexing, time multiplexing, and spatial multiplexing. It is clear.

  In the embodiment of the present invention, photoelectric conversion is performed in order to perform 3R processing. However, the present invention can be implemented without necessarily using photoelectric conversion. For example, A. Hirano et al., "An All-optical signal discriminator: application to 2.4 Gb / s all-optical regeneration and 20 Gb / s demultiplexing," in proc. Of OECC '96, 18B4-3, pp. 342-343 , 1996. describes an example in which 3R processing can be performed on light without photoelectric conversion.

FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 2 is a block diagram illustrating a signal processing switching unit used in FIG. 1. FIG. 2 is a diagram illustrating a format of an optical signal used in FIG. 1. FIG. 9 is a block diagram showing a second embodiment of the present invention. FIG. 11 is a block diagram showing a third embodiment of the present invention. FIG. 14 is a block diagram showing a fourth embodiment of the present invention. FIG. 9 is a block diagram showing a conventional example. FIG. 8 is a block diagram showing 702 and 703 in FIG. 7.

Explanation of reference numerals

101, 106 photoelectric conversion unit 102 3R processing unit 103 optical transmission management byte termination unit 104 signal processing switching unit 105 optical transmission management byte generation unit 107 control management information processing device 300 optical signal format 400, 500, 600 optical communication device 800 3R reproduction Repeater

Claims (7)

  Means for performing 3R regeneration relay of the optical signal, means for monitoring the signal quality of the preceding 3R regeneration relay section, signal processing switching means for switching input signals and processing management information, and 3R regeneration at the next stage Means for adding information so that the signal quality can be monitored in the optical communication apparatus performing the processing, and means for processing network control management information, and a singular signal demultiplexed from one or more optical signal demultiplexing systems. Alternatively, a plurality of optical signals are input to a means for performing 3R regeneration relay of the optical signal, the means for monitoring the signal quality monitors the quality of the input optical signal, and the means for adding the information includes Information is added to the input signal so that the quality of the optical signal can be managed by the optical communication device performing 3R reproduction, and the signal added with the information is output to one or more optical signal multiplexing systems. Means for processing network control management information, receiving the signal quality information of the input optical signal from the signal quality monitoring means, and connecting the signal processing switching means and other optical communication devices to the network An optical communication device for transmitting and receiving control management information.   Means for performing 3R regeneration of the optical signal, means for monitoring the signal quality of the 3R regeneration relay section, signal processing switching means for switching input signals and processing management information, and processing network control management information Means for inputting one or a plurality of optical signals demultiplexed from one or a plurality of optical signal demultiplexing systems to means for performing 3R regeneration of the optical signal, and monitoring the signal quality of the 3R regeneration relay section. The means monitors the quality of the input optical signal, and the means for processing the control management information of the network receives the signal quality information of the input optical signal from the signal quality monitoring means, and An optical communication device for exchanging network control management information with the signal processing switching means and another optical communication device.   Signal processing switching means for switching input signals and processing management information; means for adding information so that signal quality can be monitored in an optical communication apparatus for performing 3R reproduction at the next stage; and network control management Means for processing information, wherein a signal is inputted to the signal processing switching means, and the means for adding the information is inputted so that the quality of the optical signal can be managed by an optical communication apparatus for performing 3R reproduction at the next stage. The information-added signal is added to the signal, and the information-added signal is output to one or more optical signal multiplexing systems. The means for processing the network control management information includes the signal processing switching means and another optical communication device. An optical communication device for transmitting and receiving control management information of a network.   4. The optical communication apparatus according to claim 1, wherein the optical signal multiplexing / demultiplexing system and the optical signal multiplexing system are wavelength multiplexing systems.   Means for generating and terminating a wavelength, and means for monitoring the quality of an optical signal terminated by the means for generating and terminating the wavelength, wherein the means for monitoring the quality of the optical signal comprises control management of the network. The optical communication device according to claim 4, wherein the optical communication device is connected to a unit that processes information.   An optical communication apparatus in an optical signal multiplexing system, wherein an optical signal of a type having an area for storing information for monitoring signal quality in a 3R regeneration relay section is input / output.   The quality information of the wavelength of the transmission signal is stored in the signal, the signal is transmitted, the quality information of the wavelength stored in the reception signal, and the quality information of the wavelength of the reception signal, the quality of the reception signal, An optical communication device characterized by monitoring.

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