JP2014011594A - Optical transmission device and its communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical transmission device that is able to learn a route of an optical signal on a network by transmission and reception of information between neighboring optical transmission devices, to construct an efficient network, and to manage a fault response.SOLUTION: An optical transmission device 60 is comprised of receiving means 61, information generating means 62, storage means 63, determination means 64, and transmitting means 65. The receiving means 61 receives first network information including information on a line on a transmission path, the identifier of a transmission device, its order, and wavelength of an optical signal from a neighboring transmission device. The information generating means 62 generates second network information by adding information on a line with the neighboring transmission device, the identifier of the neighboring transmission device, and wavelength of the optical signal to the first network information. The determination means 64 determines a transmission route of the optical signal and a transmission destination on the basis of the second network information. The transmitting means 65 transmits the optical signal to an optical transmission device which is the transmission destination of the optical signal determined by the determination means 64.

Description

  The present invention relates to a technique related to optical communication, and more particularly to an optical transmission apparatus and a communication method between the optical transmission apparatuses.

  With the development of the information and communication society, the importance of optical communication capable of high-speed and high-capacity communication is increasing. As the amount of communication increases, the complexity of networks constructed by the configuration of optical transmission devices used for communication and combinations of various optical transmission devices is increasing. On the other hand, with the increasing social importance of information communication, the impact of network failures and the like has increased, and the demand for network reliability has increased. For this reason, development of techniques for efficiently constructing a network and techniques for monitoring a network and responding to the occurrence of a failure have been actively conducted.

  To manage complex networks and quickly respond to failures, efficiently recognize network connection status when optical transmission equipment or communication routes are recombined, or when a route is changed due to a failure. It is desirable to be able to do it. For this purpose, a technique is required for grasping the communication path and communication status of each signal in the network and configuring and managing a network that can easily cope with a failure. As a technique for responding to network monitoring and failure occurrence, for example, a technology for transmitting and receiving communication status and failure occurrence information using an OSC (Optical Supervisory Channel) signal between optical transmission apparatuses can be cited. As a technique for transmitting and receiving information related to communication between such optical transmission apparatuses, a technique as disclosed in Patent Document 1 is disclosed.

  The optical transmission device disclosed in Patent Document 1 divides a part of an optical signal, extracts an OSC signal, adds information on the own device to the OSC signal, and then multiplexes the optical signal on the transmission line again. It has a function to insert it into. The optical transmission device of Patent Document 1 has a measurement function such as the power of an optical signal, and information created based on the measurement result is added to the OSC signal as performance information. The addition of the performance information is performed for each optical transmission device that passes through, and the performance information is recorded in the most downstream optical transmission device and used for identifying an abnormal part.

  The optical transmission device disclosed in Patent Document 2 has a function of adding an alarm signal to an OSC signal and notifying another optical transmission device, and a function of extracting an alarm signal from another optical transmission device. . An alarm signal is issued when a communication line abnormality is detected.

JP 2012-15966 A JP 2011-223334 A

  However, the technique disclosed in Patent Document 1 has the following problems. In the optical transmission device of Patent Document 1, an optical signal is measured, an optical signal for transmission is generated based on the measurement result, and the optical signal is transmitted to the downstream optical transmission device. For this reason, only downstream optical transmission apparatuses can collect network information, and it is necessary to construct a separate system in order to use information on the optical signal transmission side. In addition, there is no disclosure of a technique for dealing with a route change or the like when a route recombination occurs when a communication failure occurs.

  In the optical transmission device of Patent Document 2, an alarm signal is issued when a failure occurs, and other devices can recognize the occurrence of the failure. However, as with Patent Document 1, a technique for dealing with a route change or the like is disclosed. Not.

  In the present invention, by transmitting and receiving information between adjacent optical transmission apparatuses, the optical signal path on the network is grasped, and an optical transmission apparatus capable of efficiently constructing a network and managing failure handling is obtained. It is aimed.

  In order to solve the above problems, the optical transmission apparatus of the present invention includes a receiving unit, an information generating unit, a storage unit, a determining unit, and a transmitting unit. The receiving means adjoins the first network information including the identifier of the line and the transmission device on the optical signal transmission line, the order of the line and the transmission device on the transmission line, and the wavelength information of the optical signal transmitted on the transmission line. Receive from the transmitting device. The information generation means adds the line between the transmission device adjacent to the received first network information, the identifier of the adjacent transmission device, and the wavelength information of the optical signal transmitted and received between the adjacent transmission devices. To generate second network information. The storage means stores the second network information. The determining means includes the optical signal transmission path and transmission destination based on the identifier of the line and transmission apparatus on the optical signal transmission path and the order information on the transmission path of the line and transmission apparatus included in the second network information. The adjacent optical transmission device is determined. The transmission unit transmits the optical signal to the adjacent optical transmission device that is the transmission destination of the optical signal determined by the determination unit.

  According to the present invention, an optical transmission device can communicate by obtaining network information only by communication with an adjacent optical transmission device. Since it is based on transmission / reception of information between adjacent optical transmission apparatuses, a large-scale system or the like is not necessary, and a network can be efficiently constructed and managed.

It is a figure which shows the outline | summary of a structure of the 1st Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 1st Embodiment of this invention. It is a figure which shows the example of the data in the 1st Embodiment of this invention. It is a figure which shows the example of the data in the 1st Embodiment of this invention. It is a figure which shows the example of the data in the 1st Embodiment of this invention. It is a figure which shows the example of the data in the 1st Embodiment of this invention. It is a figure which shows the example of the data in the 1st Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 2nd Embodiment of this invention. It is a figure which shows the example of the signal path | route in the 2nd Embodiment of this invention. It is a figure which shows the example of the signal path | route in the 2nd Embodiment of this invention. It is a figure which shows the example of the signal path | route in the 2nd Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 3rd Embodiment of this invention. It is a figure which shows the example of the signal path | route in the 3rd Embodiment of this invention. It is a figure which shows the example of the signal path | route in the 3rd Embodiment of this invention. It is a figure which shows the example of the signal path | route in the 3rd Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 4th Embodiment of this invention.

  A first embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 shows an outline of the configuration of the optical transmission apparatus according to this embodiment.

  The optical transmission device 10 of this embodiment includes a communication function unit 11, a control unit 12, a storage unit 13, and a signal control unit 14. The optical transmission device 10 includes a signal branching unit 15 and a signal branching unit 19, a signal receiving unit 16 and a signal receiving unit 20, a signal transmitting unit 17 and a signal transmitting unit 21, a signal inserting unit 18 and a signal inserting unit 22. And.

  An optical signal is input from the optical fiber 30 to the optical transmission device 10, and is branched into optical signals to the optical fiber 31 and the optical fiber 32 by the signal branching unit 15. The optical signal branched to the optical fiber 31 is input to the communication function unit 11. The optical signal branched to the optical fiber 32 is input to the signal receiving unit 16. An optical signal is also input to the optical transmission device 10 from the optical fiber 40, and is branched into optical signals to the optical fiber 41 and the optical fiber 42 in the signal branching unit 19. The optical signal branched to the optical fiber 41 is input to the communication function unit 11. The optical signal branched to the optical fiber 42 is input to the signal receiving unit 20. An output optical fiber 33 and an optical fiber 43 are connected to the communication function unit 11. The optical fiber 33 is connected to the signal insertion unit 18, and the optical fiber 43 is connected to the signal insertion unit 22. An optical fiber 34 is connected to the signal transmission unit 17 for output, and the optical fiber 34 is connected to the signal insertion unit 18. An optical fiber 44 is connected to the signal transmission unit 21 for output, and the optical fiber 44 is connected to the signal insertion unit 22. In the signal insertion unit 18, the optical signals from the optical fiber 33 and the optical fiber 34 are combined and output to the optical fiber 35. In the signal insertion unit 22, the optical signals from the optical fiber 43 and the optical fiber 44 are combined and output to the optical fiber 45.

  The communication function unit 11 and the control unit 12, the control unit 12 and the storage unit 13, and the control unit 12 and the signal control unit 14 are connected via a signal cable, and can transmit and receive information to and from each other. In addition, the signal receiving unit 16, the signal transmitting unit 17, the signal receiving unit 20, and the signal transmitting unit 21 are connected to the signal control unit 14 via a signal cable, etc., and transmit and receive information via the signal cable. Can do.

  The communication function unit 11 has a function related to transmission of an optical signal of the optical transmission device 10. For example, the communication function unit 11 has an optical add / drop function for branching a part of an optical signal and transmitting it to a terminal device or the like and inserting an optical signal from the terminal device or the like. Further, the optical transmission device 10 may be used as an optical cross-connect device by using the add / drop function of the communication function unit 11. When the optical transmission device 10 is used as an optical signal repeater, the communication function unit 11 may have an optical signal amplification or signal correction function.

  The control unit 12 has a function of controlling the entire optical transmission device 10. For example, the control unit 12 controls optical signal processing in the communication function unit 11. Control of processing of the optical signal means that the transmission destination of the optical signal is specified based on the data in the storage unit 13 and the path is selected, or if the communication function unit 11 has a correction function, determination and instruction of the correction amount and the like It means to do. The control unit 12 stores information related to communication obtained from the signal control unit 14 in the storage unit 13. In addition, the control unit 12 transmits information related to communication stored in the storage unit 13 to another device via the signal control unit 14. The control unit 12 has a function of combining information stored in the storage unit 13, recognizing network information such as an optical signal transmission path to each transmission device, and storing the information in the storage unit 13.

  The storage unit 13 stores inter-device information related to communication received from adjacent transmission devices and network information that summarizes the information. The storage unit 13 may store a control program and setting information for the optical transmission apparatus 10.

  The signal control unit 14 sends the signal received by the signal receiving unit 16 and converted into an electric signal to the control unit 12. The signal control unit 14 has a function of receiving network information and the like from the control unit 12 and controlling the signal transmission unit 17 to transmit an optical signal including the network information and the like. The signal control unit 14 sends the signal received by the signal receiving unit 20 and converted into an electric signal to the control unit 12. The signal control unit 14 has a function of receiving network information and the like from the control unit 12 and controlling the signal transmission unit 21 to transmit an optical signal including the network information and the like.

  The signal branching unit 15 and the signal branching unit 19 are configured by an optical coupler or the like. The signal branching unit 15 branches the optical signal into an optical signal to the optical fiber 31 on the communication function unit 11 side and an optical signal to the optical fiber 32 on the signal receiving unit 16 side. The signal branching unit 19 branches the optical signal into an optical signal to the optical fiber 41 on the communication function unit 11 side and an optical signal to the optical fiber 42 on the signal receiving unit 20 side.

  The signal receiving unit 16 and the signal receiving unit 20 receive an optical signal and convert it into an electrical signal. The optical signal receiving unit includes a photodiode. In addition, in order to receive an optical signal in a predetermined wavelength region set in advance, the signal receiving unit 16 and the signal receiving unit 20 are provided with a diffraction grating, and receive only an optical signal having a predetermined wavelength after being demultiplexed. Is done. The optical signal received by the signal receiving unit 16 and the signal receiving unit 20 is an optical signal including information related to an optical transmission device on the network. The predetermined wavelength refers to a band allocated in the network design in order to transmit / receive information regarding transmission devices on the network between the devices.

  The signal transmission unit 17 and the signal transmission unit 21 have a function of transmitting network information and the like of the own device to adjacent transmission devices. The signal transmission unit 17 and the signal transmission unit 21 have a transponder unit including a semiconductor laser in order to convert an electrical signal from the signal control unit 14 into an optical signal and transmit it. The wavelength of the optical signal that can be transmitted from the transponder unit may be variable so that it can cope with a change in the predetermined wavelength of the optical signal.

  The signal insertion unit 18 and the signal insertion unit 22 are configured by an optical coupler or the like. The signal insertion unit 18 multiplexes the optical signal from the optical fiber 33 on the communication function unit 11 side and the optical signal from the optical fiber 34 on the signal transmission unit 17 side, and outputs them to the optical fiber 35. The signal insertion unit 22 multiplexes the optical signal from the optical fiber 43 on the communication function unit 11 side and the optical signal from the optical fiber 44 on the signal transmission unit 21 side, and outputs the resultant signal to the optical fiber 45.

  Next, an operation when collecting network information related to a network route or the like using the optical transmission apparatus of the present embodiment will be described.

  An optical signal is input from the transmission path to the optical transmission apparatus 10 via the optical fiber 30. The optical signal input to the optical transmission apparatus 10 is branched by the signal branching unit 15 into an optical signal to the optical fiber 31 side and an optical signal to the optical fiber 32 side. An optical signal to the optical fiber 31 side is input to the communication function unit 11.

  The optical signal input to the communication function unit 11 is processed according to the installation purpose of the optical transmission device 10. For example, when the optical transmission device 10 is used as a relay device, signal correction such as optical signal amplification and noise removal is performed. In addition, when the optical transmission device 10 is used as a device constituting an optical cross-connect unit, the optical signal input from each transmission path is demultiplexed and distributed to each transmission destination path, and then multiplexed. The process of outputting to the transmission line is performed again. The communication function unit 11 may be provided with a wavelength conversion function to convert to a wavelength different from the input signal. The optical signal processed by the communication function unit 11 is output to the optical fiber 33.

  The optical signal branched to the optical fiber 32 side by the signal branching unit 15 is input to the signal receiving unit 16. The optical signal input to the signal receiving unit 16 is demultiplexed, and an optical signal having a predetermined wavelength is received by the light receiving unit of the signal receiving unit 16 and converted into an electrical signal. The predetermined wavelength is determined by the network design for information transmission / reception between apparatuses.

  The signal received by the signal receiving unit 16 includes inter-device information and network information. Inter-device information refers to information related to connection between two optical transmission devices. The inter-device information includes a signal identifier, a line identifier, and a signal wavelength used for communication between two optical transmission devices. The inter-device information includes information on the wavelength of signals that are not used. The network information includes path information from a certain optical transmission device to the optical transmission device that is a signal destination. The path information includes the identifier of the signal used for communication, the identifier of the optical transmission device through which it is routed, the identifier of the line, and the wavelength of the signal, and the route to the destination optical transmission device is recorded.

When the signal control unit 14 receives a signal including inter-device information and network information from the signal receiving unit 16, the signal control unit 14 transmits the signal to the control unit 12. The control unit 12 stores inter-device information and network information in the storage unit 13. When the control unit 12 determines that the own device is included in the network information,
Network information is updated by adding inter-device information between the own device and adjacent devices to the network information. The control unit 12 stores the updated network information in the storage unit 13. Although the optical signal input to the optical transmission device 10 from the optical fiber 30 side has been described above, the same applies to the case of the optical signal input from the optical fiber 40 side.

  Next, an operation when an inter-device information or network information is requested from an adjacent device will be described. Assume that the signal receiving unit 16 or the signal receiving unit 20 receives an optical signal including a request for information from an adjacent optical transmission apparatus. The received optical signal is converted into an electrical signal by the signal receiving unit 16 or the signal receiving unit 20 and input to the signal control unit 14. The signal control unit 14 transmits an information request signal to the control unit 12. Upon receiving the information request signal, the control unit 12 checks whether the corresponding information exists in the storage unit 13 and transmits the corresponding information to the signal control unit 14 if it exists. If the requested information does not exist, the control unit 12 transmits information indicating that it does not exist to the signal control unit 14. The signal control unit 14 transmits the information received from the control unit 12 to the signal transmission unit 21 or the signal transmission unit 17 together with a transmission instruction. When receiving a request for information from the optical fiber 30 side, the signal control unit 14 transmits to the signal transmission unit 21, and when receiving a request from the optical fiber 40 side, transmits to the signal transmission unit 17. A description will be given on the assumption that the signal control unit 14 has sent information and a transmission instruction to the signal transmission unit 21. Upon receiving the information transmission instruction, the signal transmission unit 21 converts the signal into an optical signal having a predetermined wavelength. The predetermined wavelength is determined for information transmission between devices in network design. The optical signal generated by the signal transmission unit 21 is output to the optical fiber 44. The optical signal output to the optical fiber 44 is input to the signal insertion unit 22. In the signal insertion unit 22, the optical signal output from the communication function unit 11 and transmitted from the optical fiber 43 and the optical signal from the optical fiber 44 are combined. The optical signal combined by the signal insertion unit 22 is sent to the optical fiber 45 and output from the optical transmission device 10. When transmitted from the optical signal transmitter 17, the optical signal is output from the optical transmission device 10 via the optical fiber 35.

  Next, a method for transmitting information between devices and network information between optical transmission devices when a network is configured with a plurality of optical transmission devices will be described.

  FIG. 2 shows a configuration in which four optical transmission apparatuses according to this embodiment are connected. As shown in FIG. 2, it is assumed that a first optical transmission device 51, a second optical transmission device 52, a third optical transmission device 53, and a fourth optical transmission device 54 are connected. The first optical transmission device 51 is labeled N1, the second optical transmission device 52 is labeled N2, the third optical transmission device 53 is labeled N3, and the fourth optical transmission device 54 is labeled N4. . Further, the line between the first optical transmission device 51 and the second optical transmission device 52 is F1, the line between the second optical transmission device 52 and the third optical transmission device 53 is F2, and the third optical signal is transmitted. The line between the transmission device 53 and the fourth transmission device 54 is F3. Optical signals can be communicated bidirectionally between the optical transmission apparatuses. Further, it is assumed that the name as an identifier of the optical signal transmitted on each line is S1, and the wavelength of the optical signal is λ1.

  The case where the first optical transmission apparatus 51 stores the inter-device information related to the communication with the second optical transmission apparatus 52 which is an adjacent optical transmission apparatus will be described. It is assumed that the first optical transmission device 51 transmits the signal S1 to the second optical transmission device 52 using the line F1. At this time, the first optical transmission device 51 stores a data table as shown in FIG. 3 in which information related to communication with the second optical transmission device 52 is recorded. In the data table of FIG. 3, transmission / reception, signal name, communication destination, line, and wavelength are recorded. Transmission / reception is a transmission signal or a reception signal, and is denoted by T as an example showing a transmission signal when transmitting from the first optical transmission device 51 to the second optical transmission device 52. In the present embodiment, the received signal from another device is expressed as R. The signal name is an identifier assigned to each signal, and is assigned like S1 in the example of the present embodiment. The communication destination is an identifier of an adjacent transmission apparatus that is a communication partner, and is assigned as N2 in the example of this embodiment. The line is an identifier of the line used for communication with the communication destination, and is indicated as F1 in this embodiment. The wavelength is the center wavelength of the optical signal used for communication, and may be expressed by numerical values such as S1 wavelength and frequency, but in the description of the present embodiment, it is expressed by a symbol such as λ1.

  Next, when the second optical transmission device 52 transmits the signal S1 received from the first optical transmission device 51 to the third optical transmission device 53 via the line F2, the second optical transmission device 52 An example of a data table to be generated is shown. The second optical transmission device 52 has a data table as shown in FIG. 4 for the signal S1. In FIG. 4, inter-device information about the first optical transmission device 51 and the third optical transmission device 53, which are communication destinations, is recorded for the signal S1, and transmission / reception distinction, line used and wavelength are associated with each of them. Attached and recorded. In the transmission / reception column, R is indicated because the signal from the first optical transmission device 51 is a received signal, and T is indicated because it is a transmission signal to the third optical transmission device 53.

  Assume that the first optical transmission device 51 requests the second optical transmission device 52 for network information that the second optical transmission device 52 has. The second optical transmission device 52 returns to the first optical transmission device 51 a data table as shown in FIG. The first optical transmission device 51 receives a data table as shown in FIG. 4 from the second optical transmission device 52. When the first optical transmission device 51 receives the data table, the first optical transmission device 51 recognizes from the data table that communication settings are established between the second optical transmission device 52 and the third optical transmission device 53 with respect to the signal S1. To do. Next, the first optical transmission device 51 sets the communication with the second optical transmission device 52 as the primary connection with respect to the signal S <b> 1, and between the second optical transmission device 52 and the third optical transmission device 53 ahead. Are connected as secondary connections. The first optical transmission apparatus 51 stores the data as a data table as shown in FIG. In FIG. 5, information regarding the line and wavelength with N2 of the primary connection destination and the information about the line and wavelength between N2 and N3 ahead are recorded for the communication with the signal S1. By linking and saving as shown in FIG. 5, the first optical transmission device 51 can recognize setting information related to communication up to the third optical transmission device 53.

  The signal S1 is transmitted from the first optical transmission device 51 to the second optical transmission device 52, further transmitted to the third optical transmission device 53, and finally transmitted to the fourth optical transmission device 54. Suppose that At this time, the second optical transmission device 52 can recognize the secondary connection information as shown in FIG. 6 by the method described above. FIG. 6 shows network information held by the second optical transmission device 52 regarding the connection with N3 as the primary connection and N3 to N4 as the secondary connection. When there is a request for network information from the first optical transmission apparatus 51 to the second optical transmission apparatus 52, the second optical transmission apparatus 52 returns a data table as shown in FIG. When the first optical transmission device 51 receives the data table from the second optical transmission device 52, the first optical transmission device 51 communicates the information between the devices with the second optical transmission device 52 and the route to the fourth optical transmission device 54. Link and save as shown in FIG. FIG. 7 shows network information when N1 is a primary connection, N2 to N3 are secondary connections, and N3 to N4 are tertiary connections. Since the first optical transmission device 51 has network information as shown in FIG. 7, it is possible to communicate with the fourth optical transmission device 54 for the optical signal S1.

  When the optical transmission apparatus of the present embodiment is used, it is possible to perform communication by obtaining network information only by communication with adjacent optical transmission apparatuses. Since it is based on transmission / reception of information between adjacent optical transmission apparatuses, a large-scale system or the like is not necessary, and a network can be efficiently constructed and managed.

  A second embodiment of the present invention will be described in detail with reference to FIG. In the first embodiment, the optical transmission devices are connected in series. However, in the second embodiment, a network network including three or more optical transmission devices is configured.

  Assume that the network of this embodiment is composed of nine optical transmission apparatuses N1 to N9 as shown in FIG. Each optical transmission apparatus is connected via a line using optical fibers F1 to F15. Also, assume that each optical transmission device has the same configuration and function as the optical transmission device of the first embodiment. In the optical transmission device 10 of the first embodiment in FIG. 1, the input / output from the communication function unit 11 is only two systems, but when used in this embodiment, there are a necessary number of input / output systems. To do.

  It is assumed that the signal S1 is input to the optical transmission device N1, transmitted in the order of N1, N2, N3, N6, and N9 and transmitted to the optical transmission device N9. Further, it is assumed that the lines that pass when the signal S1 is transmitted from the optical transmission apparatuses N1 to N9 are in the order of F1, F2, F7, and F13. At this time, the wavelength of the signal S1 is λ1.

  The optical transmission device N6 transmits the signal S1 to the N9 via the line F13 with the wavelength λ1. At this time, the optical transmission device N6 has data including “T, S1, N9F13λ1” indicating information on transmission / reception, signal name, communication destination, line, and wavelength as information between devices related to communication with N9. The inter-device information is shown in a table format in the first embodiment, but may be described in a predetermined format. In this embodiment, the information between devices is expressed as “T, S1, N9F13λ1”.

  Similarly, the optical transmission apparatus N3 transmits the signal S1 to the N6 via the line F7 with the wavelength λ1. At this time, the optical transmission device N3 has data of “T, S1, N6F7λ1” regarding communication with N6. Since the optical transmission apparatuses N3 and N6 are adjacent to each other, data including “T, S1, N9F13λ1” is sent from the N6 to the optical transmission apparatus N3. When the optical transmission device N3 receives data from N6, the optical transmission device N3 generates data by associating the data of the inter-device information related to communication with N6 owned by N3 and the data received from N6. At this time, the data generated by the optical transmission device N3 has a format such as “T, S1, N6F7λ1, N9F13λ1”. This is network information corresponding to the primary connection and the secondary connection in the first embodiment shown in the table.

  Similarly, since the optical transmission apparatus N2 transmits the signal S1 to the N3 via the line F2 with the wavelength λ1, the optical transmission apparatus N2 has data “T, S1, N3F2λ1”. When the optical transmission device N2 receives data including “T, S1, N6F7λ1, N9F13λ1” from N3, the optical transmission device N2 associates the data and generates “T, S1, N3F2λ1, N6F7λ1, N9F13λ1”.

  Since the optical transmission apparatus N1 transmits the signal S1 to the N2 via the line F1, it has data “T, S1, N2F1λ1”. When the optical transmission device N1 receives the data “T, S1, N3F2λ1, N6F7λ1, N9F13λ1” from N2, the optical transmission device N1 associates the data with N2. As a result, the optical transmission apparatus N1 generates data of “T, S1, N2F1λ1, N3F2λ1, N6F7λ1, N9F13λ1”. Thereby, the optical transmission apparatus N1 can recognize the network information up to N9. The optical transmission device N1 can communicate with N9 regarding the optical signal S1 based on the network information including the route to N9. At this time, in order to transmit a signal to N9, the optical transmission device N1 transmits the signal S1 to the next optical transmission device N2 on the network information by using the line F1 with the wavelength λ1.

  In the optical network according to the present embodiment, it is assumed that a failure occurs in communication via the line F7 and communication cannot be performed between the optical transmission apparatuses N3 and N6. FIG. 9 schematically shows an example in which the failure C1 occurs in F7.

  The optical transmission device N3 detects that a failure has occurred in communication via the line F7 and communication with N6 cannot be performed. The optical transmission apparatus N3 requests information from the adjacent N5 via the line F6 that is not used for communication of the signal S1. At this time, the optical transmission device N3 transmits network information to N5. The optical transmission device N5 compares the network information obtained from N3 with the inter-device information with confidence, and recognizes that N6 adjacent to the network information of N3 exists. When the optical transmission device N5 cannot recognize a device having information in the network information of N3, the optical transmission device N5 transfers the information from N3 to the adjacent device. The device that has received the transfer confirms whether or not there is a device having the information in the network information and transmits the result. Information is transferred within a predetermined number of times, and when the predetermined number of times is reached, only the presence / absence of a device that matches the network information is returned without being transferred.

  In the example of the present embodiment, the optical transmission device N5 can be connected to N6 via a line F9 as shown in FIG. At this time, the optical transmission apparatus N5 transmits inter-device information including data such as “T, S0, N6F9λ1” when the wavelength λ1 is unused in the communication between the N6 via the path N6. have. In the present embodiment, the notation S0 is used to indicate that the optical signal is not used.

  When the optical transmission apparatus N5 recognizes that the faulty line can be complemented by connecting to N6, the optical transmission apparatus N5 transmits information including “T, S0, N6F9λ1” to N3. When the optical transmission device N3 receives information including “T, S0, N6F9λ1”, the optical transmission device N3 recognizes that communication can be made via N5 to N6 that has been communicating so far. The optical transmission device N3 notifies N5 of communication of the signal S1 at the wavelength λ1. The optical transmission device N5 transmits to N6 a notification of communication at the wavelength λ1 for the signal S1. When the optical transmission device N6 receives a notification of communication at the wavelength λ1 with respect to the signal S1, the optical transmission device N6 returns information indicating that communication is possible to N5 if communication can be established. At this time, data including “T, S1, N9F13λ1” is transmitted from the optical transmission apparatus N6 to N5.

  The optical transmission device N5 adds inter-device information related to communication performed by N5 with N6 to the information from N6. When the optical transmission device N5 generates the data “T, S1, N6F9λ1, N9F13λ1”, the data is transmitted to the optical transmission device N3 via the line F6. The optical transmission device N3 generates data of “T, S1, N5F6λ1, N6F9λ1, N9F13λ1” and transmits this network information to N2. The network information is transmitted in order from the optical transmission device N2 to N1, and data “T, S1, N2F1λ1, N3F2λ1, N5F6λ1, N6F9λ1, N9F13λ1” is generated by the optical transmission measure N1. The optical transmission apparatus N1 can perform communication of the signal S1 based on network information including data of “T, S1, N2F1λ1, N3F2λ1, N5F6λ1, N6F9λ1, N9F13λ1” indicating the route of FIG. As described above, an alternative route can be formed from the optical transmission apparatuses N1 to N9 even when a failure occurs in the middle line. Therefore, also in this case, communication of the signal S1 from the optical transmission apparatuses N1 to N9 becomes possible.

  Next, it is assumed that a failure has occurred in two lines, line F6 and line F7. FIG. 11 shows the failure on the line F6 as C2, and the failure on the line F7 as C1. Assume that the optical transmission device N3 detects a failure and recognizes that communication via the line F7 regarding the signal S1 is impossible. Further, it is assumed that the optical transmission apparatus N3 recognizes the failure of the line F6. When the optical transmission apparatus N3 recognizes that a line other than the line with N2 in the direction of the signal transmission source is impossible, the optical transmission apparatus N3 transmits information indicating that communication of the signal S1 is impossible to N2.

  When receiving the information that communication via N3 is impossible, the optical transmission device N2 requests information from N5 via the line F5. At this time, the optical transmission apparatus N2 adds its own network information and requests information from N5. It is assumed that the optical transmission device N5 can connect to N6 included in the network information held by N2 and does not use the wavelength λ1. At this time, if the wavelength λ1 can be used on the line F9, the optical transmission apparatus N5 returns information of “T, S1, N6F9λ1, N9F13λ1” to N2. When the optical transmission device N2 receives a reply from N5, it adds information related to communication with N5 and generates data of “T, S1, N5F5λ1, N6F9λ1, N9F13λ1”. The optical transmission apparatus N2 transmits “T, S1, N5F5λ1, N6F9λ1, N9F13λ1” to N1. When the optical transmission device N1 receives data from N2, it adds information relating to communication with N2, and generates “T, S1, N2F1λ1, N5F5λ1, N6F9λ1, N9F13λ1”. The optical transmission device N1 can communicate with N9 based on this data. At this time, in order to transmit a signal to N9, the optical transmission device N1 transmits the signal S1 to the next optical transmission device N2 on the network information by using the line F1 with the wavelength λ1.

  When the optical network of this embodiment is used, it is possible to perform communication by obtaining network information based on communication with an adjacent optical transmission apparatus. In addition, even when a failure occurs, it is possible to perform communication by obtaining information including an alternative route that avoids the location where the failure has occurred based on communication between adjacent optical transmission apparatuses. Since it is based on transmission / reception of information between adjacent optical transmission apparatuses, a large-scale system or the like is not necessary, and a network can be efficiently constructed and managed.

  A third embodiment of the present invention will be described in detail with reference to FIG. In the second embodiment, there is one signal, but in this embodiment, two or more signals are transmitted. The optical network of the third embodiment is also configured by nine optical transmission devices N1 to N9 as in the second embodiment. The configuration and function of each optical transmission apparatus are the same as those in the first embodiment. In the optical transmission device 10 of the first embodiment in FIG. 1, the input / output from the communication function unit 11 is only two systems, but when used in this embodiment, there are a necessary number of input / output systems. To do.

  FIG. 12 shows an example in which two signals S1 and S2 flow simultaneously, and wavelength λ1 is used in both signals S1 and S2. The signal S1 is input by the optical transmission device N1 and transmitted as N2, N3, N6, and N9. Between the optical transmission apparatuses, the signal S1 passes through the lines F1, F2, F7, and F13. Further, it is assumed that the signal S2 is input by the optical transmission device N4 and sent as N5 and N6. At this time, the signal S2 passes through the lines F8 and F9. In the example of FIG. 12, since there is no overlap between the paths of the signals S1 and S2, the signals S1 and S2 do not affect each other and can communicate without using the same wavelength λ1. At this time, the network information regarding the signal S1 included in the optical transmission device N1 is “T, S1, N2F1λ1, N3F2λ1, N6F7λ1, N9F13λ1”. The network information related to the signal S2 included in the optical transmission device N4 is “T, S2, N5F8λ1, N6F9λ1”.

  Assume that a failure has occurred in the line F7 used for communication of the signal S1 as shown in FIG. Since the optical transmission apparatus N3 cannot communicate with N6 via the line F7, it detects a failure on the line F7. At this time, the optical transmission device N3 requests communication status information from N5 via the line F6 that has not performed communication. In the second embodiment, the alternative route can be established only by switching the line. However, in this embodiment, the signal of wavelength λ1 is overlapped on the line F9 as shown in FIG. Can not. Since the optical transmission apparatus N5 cannot assign λ1 to the signal S1, it returns data including “T, S2, N6F9λ1” to N3. When the optical transmission device N3 identifies that the wavelength λ1 has already been used, it checks whether there is another free wavelength. For example, it is assumed that the information from the optical transmission device N5 includes data of a free wavelength such as “T, S0, N6F9λ2”. In this case, the optical transmission device N3 sends an instruction to N5 to convert the wavelength of the signal S1 to λ2 and perform communication with N6. When the optical transmission device N5 receives an instruction to convert the wavelength from N3, the optical transmission device N5 transmits information for performing communication at λ2 with respect to the signal S1 to N6. When the optical transmission device N6 is capable of receiving at λ2, it returns data “T, S1, N9F13λ1” of information between devices when transmitting the signal S1 to N9 together with information indicating that communication is possible. When the optical transmission device N5 receives information that can be communicated from N6, the data obtained from N6 is added with the data of the device-to-device information relating to the communication between N5 and N6 to generate “T, S1, N6F9λ2, N9F13λ1”. .

  The optical transmission apparatus N5 transmits data including “T, S1, N6F9λ2, N9F13λ1” to N3 together with information indicating that communication of the signal S1 is possible. When the optical transmission device N3 receives the information indicating that the signal S1 can be transmitted, the inter-device information is added to the obtained network information related to communication and is sent to N2. Further, when the optical transmission apparatus N2 receives data from N3, it adds necessary data and sends it to N1. When inter-device information data relating to communication with N2 is added by the optical transmission device N1, the network information data relating to the signal S1 becomes “T, S1, N2F1λ1, N3F2λ1, N5F6λ1, N6F9λ2, N9F13λ1”. The optical transmission device N1 can communicate with N9 based on this data. As described above, even when a plurality of optical signals are simultaneously used for communication, optical signal communication is possible.

  In the above example, the wavelength of only the line F9 is converted to λ2. However, the wavelength may be converted to λ2 in all the paths from the optical transmission apparatuses N1 to N9. In this case, in the above example, when the optical transmission device N3 selects communication at λ2 and sends an instruction at λ2 to the optical transmission device N5, N3 also transmits and receives optical signals to the N2 side at λ2. Send. Upon receiving information for changing the wavelength of the optical signal from the optical transmission device N3, N2 transmits the information to N1. The optical transmission device N1 determines whether or not to transmit an optical signal at the wavelength λ2, and transmits information on whether or not transmission is possible to N2. The optical transmission device N2 also determines whether or not the optical signal with the wavelength λ2 can be transmitted and received, determines whether or not transmission is possible, and transmits the result to N3. The same confirmation is performed between the optical transmission apparatuses N5 to N9. When it is confirmed that transmission / reception of a signal at wavelength λ2 is possible on all paths, information on transmission / reception of an optical signal at wavelength λ2 is transmitted in turn from the optical transmission device N3 to each device, and the optical transmission device N1 The optical signal is transmitted at the wavelength λ2 through the path as shown in FIG. In this case, the network information of the optical transmission device N1 regarding the signal S1 is “T, S1, N2F1λ2, N3F2λ2, N5F6λ2, N6F9λ2, N9F13λ2”.

  In the present embodiment, two examples of signals S1 and S2 are shown, but three or more signals may be used. Further, the number of optical transmission devices and the number of lines between the optical transmission devices can be set according to the design of the network as well as the example shown in the present embodiment.

  When the optical network of this embodiment is used, even when a plurality of optical signals exist in the network, it is possible to perform communication by obtaining network information based on communication with adjacent optical transmission apparatuses. Since it is based on transmission / reception of information between adjacent optical transmission apparatuses, a large-scale system or the like is not necessary, and a network can be efficiently constructed and managed.

  In the first to third embodiments of the present invention, an example in which an optical signal of one wavelength is sent to one path has been shown, but communication is performed by multiplexing optical signals of different wavelengths on one path. It may be broken. By using a plurality of optical signals having different wavelengths, the optical transmission devices of the first to third embodiments of the present invention and the optical network configured thereby can be used for wavelength division multiplexing communication. In addition, the optical transmission apparatus according to the first to third embodiments of the present invention can be used as a reconfigurable optical add / drop multiplexer (ROADM).

  In the first to third embodiments of the present invention, an OSC signal or the like may be used for transmission / reception of information relating to communication between adjacent apparatuses.

  In the optical transmission apparatus shown in the first embodiment of the present invention, the optical signal is branched and inserted before the optical signal is input to the communication function unit and after the output from the communication function unit. When the communication function unit has a demultiplexing function or a multiplexing function, an optical signal having a predetermined wavelength indicating information related to communication may be input to the signal receiving unit from the signal after demultiplexing by the communication function unit. In addition, an optical signal indicating information related to communication transmitted from the signal transmission unit can be combined with another optical signal by a multiplexing function of the communication function unit.

  A fourth embodiment of the present invention will be described in detail with reference to FIG. FIG. 16 is a diagram showing an outline of the configuration of the optical transmission apparatus of this embodiment.

The optical transmission device 60 of this embodiment includes a receiving unit 61, an information generating unit 62, a storage unit 63,
Judgment means 64 and transmission means 65 are provided. The receiving means 61 includes first network information including an identifier of the line and the transmission apparatus on the optical signal transmission line, an order of the line and the transmission apparatus on the transmission line, and information on the wavelength of the optical signal transmitted on the transmission line. Received from an adjacent transmission device. The information generating means 62 adds the line between the transmission device adjacent to the received first network information, the identifier of the adjacent transmission device, and the information on the wavelength of the optical signal transmitted / received between the adjacent transmission devices. Then, the second network information is generated. The storage unit 63 stores the second network information. The determination unit 64 is configured to determine the transmission path and transmission destination of the optical signal based on the identifier of the line and the transmission device on the transmission path of the optical signal and the order information on the transmission path of the line and the transmission device included in the second network information. Next, an adjacent optical transmission device is determined. The transmission unit 65 transmits the optical signal to the adjacent optical transmission device that is the transmission destination of the optical signal determined by the determination unit 64.

  When the optical transmission apparatus of the present embodiment is used, it is possible to perform communication by obtaining network information only by communication with adjacent optical transmission apparatuses. Since it is based on transmission / reception of information between adjacent optical transmission apparatuses, a large-scale system or the like is not necessary, and a network can be efficiently constructed and managed.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

  (Supplementary note 1) First including an identifier of a line and a transmission device on an optical signal transmission line, an order of the line and the transmission device on the transmission line, and wavelength information of the optical signal transmitted on the transmission line A receiving unit that receives network information from an adjacent transmission device; a line between the first transmission unit received by the receiving unit and the adjacent transmission device; an identifier of the adjacent transmission device; and the adjacent transmission. Information generating means for generating the second network information by adding information on the wavelength of the optical signal transmitted / received to / from the apparatus, and storage means for storing the second network information generated by the information generating means A line on the transmission path of the optical signal included in the second network information stored in the storage means and an identifier of the transmission apparatus, and the transmission path of the line and the transmission apparatus. A determination unit that determines an optical signal transmission path and an adjacent optical transmission device that is a transmission destination based on the above order information, and an adjacent optical transmission that is the transmission destination of the optical signal determined by the determination unit An optical transmission apparatus comprising: a transmission unit that transmits the optical signal to the apparatus.

  (Supplementary note 2) The optical transmission apparatus according to supplementary note 1, wherein the transmission means further includes means for transmitting the second network information to an adjacent transmission apparatus.

  (Supplementary note 3) The optical transmission apparatus according to any one of Supplementary note 1 or 2, further comprising multiplexing means for multiplexing the second network information into an optical signal.

  (Additional remark 4) When a failure occurs in a line or a transmission device on the transmission path of the second network information, the information generation unit further includes path configuration means for configuring an alternative path based on the second network information. The means includes the second network information, the identifier of the transmission path of the optical signal and the identifier of the transmission apparatus, the order of the transmission line and the transmission apparatus, and the wavelength information of the optical signal in the alternative path configured by the path configuration means. And means for generating third network information, the storage means has means for storing the third network information, and the judging means is an optical signal based on the third network information. Any one of appendices 1 to 3, characterized in that the transmission means includes means for transmitting an optical signal to the transmission destination of the optical signal determined by the determination means. The optical transmission device according.

  (Additional remark 5) The wavelength which is not using the wavelength of an optical signal when the wavelength of the optical signal contained in the said 2nd network information is the same as the wavelength used by the other optical signal in the said alternative path | route Appendix 4 characterized in that the information generation means includes means for adding the wavelength information of the optical signal after being converted by the wavelength conversion means to the third network information. An optical transmission device according to 1.

  (Supplementary note 6) An optical transmission system, wherein a plurality of optical transmission devices according to any one of supplementary notes 1 to 5 are connected.

  (Supplementary note 7) A first including an identifier of a line and a transmission device on an optical signal transmission line, an order of the line and the transmission device on the transmission line, and information on a wavelength of the optical signal transmitted on the transmission line Network information is received from an adjacent transmission device, and the received first network information is transmitted and received between the line between the adjacent transmission device and the identifier of the adjacent transmission device and the adjacent transmission device. The second network information is generated by adding the information on the wavelength of the optical signal, the generated second network information is stored, and the line on the transmission path of the optical signal included in the stored second network information Before determining the transmission path of the optical signal and the adjacent optical transmission apparatus as the transmission destination based on the identifier of the transmission apparatus and the order information of the transmission line and the transmission apparatus on the transmission path. Communication method for an optical signal and transmits the optical signal to the optical transmission device adjacent to send the optical signal.

  (Supplementary note 8) The optical signal communication method according to supplementary note 7, wherein the second network information is transmitted to an adjacent transmission apparatus.

  (Supplementary note 9) The optical signal communication method according to any one of supplementary note 7 or 8, wherein the second network information is multiplexed with the optical signal.

  (Supplementary Note 10) When a failure occurs in a line or a transmission device included in the second network information, an alternative route is configured based on the second network information, and the information generation unit is configured by the route configuration unit. Third network information by adding the identifier of the transmission path of the optical signal and the identifier of the transmission path of the configured alternative path, the order of the transmission line and the transmission apparatus, and the wavelength information of the optical signal to the second network information. 10. The optical signal communication method according to any one of appendices 7 to 9, wherein:

  (Additional remark 11) The wavelength which is not using the wavelength of an optical signal when the wavelength of the optical signal contained in the said 2nd network information is the same as the wavelength used by the other optical signal in the said alternative path | route The information generation means adds the wavelength information of the optical signal after being converted by the wavelength conversion means to the third network information, and the communication means converts the third network information. 11. The optical signal communication method according to appendix 10, wherein the optical signal is transmitted and received based on information on the wavelength of the subsequent optical signal.

  The present invention can be used for a wavelength division multiplexing optical transmission apparatus in the field of optical communications.

DESCRIPTION OF SYMBOLS 10 Optical transmission apparatus 11 Communication function part 12 Control part 13 Memory | storage part 14 Signal control part 15 Signal branching part 16 Signal receiving part 17 Signal transmission part 18 Signal insertion part 19 Signal branching part 20 Signal receiving part 21 Signal transmission part 30 Optical fiber 31 Optical fiber 32 optical fiber 33 optical fiber 34 optical fiber 35 optical fiber 40 optical fiber 41 optical fiber 42 optical fiber 43 optical fiber 44 optical fiber 45 optical fiber 51 first optical transmission device 52 second optical transmission device 53 third Optical transmission device 54 Fourth optical transmission device 60 Optical transmission device 61 Receiving means 62 Information generating means 63 Storage means 64 Judging means 65 Transmitting means

Claims (10)

  Adjacent first network information including an identifier of a line and a transmission device on the transmission path of the optical signal, an order of the line and the transmission device on the transmission path, and wavelength information of the optical signal transmitted on the transmission path Between the receiving means for receiving from the transmitting apparatus, the line between the first network information received by the receiving means and the adjacent transmitting apparatus, and the identifier of the adjacent transmitting apparatus and the adjacent transmitting apparatus. Information generating means for adding the wavelength information of the optical signal to be transmitted / received in step S2 to generate second network information, storage means for storing the second network information generated by the information generating means, and the storage Means on the transmission path of the optical signal included in the second network information stored in the means and the identifier of the transmission apparatus, and the order of the line and the transmission apparatus on the transmission path. Determining means for determining an optical signal transmission path and an adjacent optical transmission device as a transmission destination based on the information of the optical signal, and transmitting the optical signal to the adjacent optical transmission device as a transmission destination of the optical signal determined by the determination means. An optical transmission apparatus comprising: transmission means for transmitting a signal. 2. The optical transmission apparatus according to claim 1, wherein the transmission means further includes means for transmitting the second network information to an adjacent transmission apparatus.   3. The optical transmission apparatus according to claim 1, further comprising multiplexing means for multiplexing the second network information into an optical signal.   When a failure occurs in a line or a transmission device on the transmission path of the second network information, the information generation means further includes a path configuration unit configured to configure an alternative path based on the second network information. An identifier of the optical signal transmission path and transmission device in the alternative route configured by the path construction means, an order of the line and transmission device, and information on the wavelength of the optical signal are added to the second network information. Means for generating third network information, the storage means has means for storing the third network information, and the determination means determines the transmission destination of the optical signal based on the third network information. 4. The apparatus according to claim 1, further comprising a determination unit, wherein the transmission unit includes a unit that transmits an optical signal to a transmission destination of the optical signal determined by the determination unit. 5. Transmission equipment. Wavelength that converts the wavelength of the optical signal to an unused wavelength when the wavelength of the optical signal included in the second network information is the same as the wavelength used in another optical signal in the alternative path 5. The apparatus according to claim 4, further comprising a conversion unit, wherein the information generation unit includes a unit that adds the wavelength information of the optical signal after being converted by the wavelength conversion unit to the third network information. Optical transmission device.   6. An optical transmission system comprising a plurality of the optical transmission devices according to claim 1 connected to each other.   Adjacent first network information including an identifier of a line and a transmission device on the transmission path of the optical signal, an order of the line and the transmission device on the transmission path, and wavelength information of the optical signal transmitted on the transmission path The wavelength of the optical signal received from the transmitting apparatus and transmitted / received between the adjacent transmission apparatus and the line between the adjacent transmission apparatus and the adjacent transmission apparatus in the received first network information To generate the second network information, store the generated second network information, and the line on the transmission path of the optical signal included in the stored second network information and the transmission device An optical signal transmission path and an adjacent optical transmission apparatus serving as a transmission destination are determined based on the identifier, information on the order of the line and the transmission apparatus on the transmission path, and the determined optical signal Communication method for an optical signal and transmits the optical signal to the optical transmission apparatus as a Shinsaki.   The optical signal communication method according to claim 7, wherein the second network information is transmitted to an adjacent transmission apparatus.   When a failure occurs in a line or transmission device included in the second network information, an alternative route is configured based on the second network information, and the information generation unit is an alternative configured by the route configuration unit Adding the identifier of the transmission line of the optical signal and the transmission device in the path, the order of the transmission line and the transmission device, and the wavelength information of the optical signal to the second network information to generate the third network information. 9. The optical signal communication method according to claim 7 or 8, wherein:   When the wavelength of the optical signal included in the second network information is the same as the wavelength used in another optical signal in the alternative path, the wavelength of the optical signal is converted to an unused wavelength, The information generating means adds information on the wavelength of the optical signal after being converted by the wavelength converting means to the third network information, and the communication means is an optical signal after the conversion of the third network information. The optical signal communication method according to claim 9, wherein the optical signal is transmitted and received based on the information on the wavelength of the optical signal.

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