JP4878192B2 - Wavelength division multiplexing transmission device and wavelength management program - Google Patents

Description

  The present invention relates to a wavelength management system in an optical transmission apparatus or system using a wavelength division multiplexing system.

  In recent years, optical transmission systems have become widespread in the communication technology field, and among them, an optical transmission system using a wavelength division multiplexing system (hereinafter also referred to as a WDM system or a wavelength division multiplexing transmission system) or an optical transmission capable of high-capacity communication. Devices (hereinafter also referred to as WDM transmission devices or wavelength division multiplexing transmission devices) have been put into practical use.

  A WDM transmission apparatus can dramatically increase the amount of information transmitted over an optical fiber by multiplexing a plurality of optical signals having different wavelengths onto a single optical fiber. Therefore, it is possible to multiplex and bundle a plurality of dedicated lines, each using a separate physical line, even before the same ground, into a single optical fiber.

  As for optical transmission devices or systems using such a wavelength division multiplexing system, as described in Patent Document 1 and Patent Document 2 below, the set of terminal devices at the transmitting and receiving ends that use a certain wavelength is determined. Therefore, in the conventional WDM transmission apparatus, one wavelength is assigned to one transmission signal, and the same wavelength is used from the transmitting terminal station to the receiving terminal station.

  Hereinafter, a configuration of a conventional WDM transmission apparatus and a WDM system using the same will be described with reference to FIG. In FIG. 10, in order to prevent the drawing from becoming complicated, the wavelength division multiplexing transmission apparatus A1 is used as a transmission side WDM transmission apparatus and the wavelength division multiplexing transmission apparatus B2 is used as a reception side WDM transmission apparatus for one-way communication. Although only the configuration is illustrated and the others are omitted, of course, the wavelength division multiplexing transmission apparatus A1 and the wavelength division multiplexing transmission apparatus B2 also have functions as a reception side and a transmission side, respectively.

  As shown in FIG. 10, the wavelength division multiplexing transmission device A1 is opposed to the terminal devices [1A] 10-1, [2A] 10-2,. Signal input units (TP) 11-1, 11-2,..., 11-n to which signals from the apparatus are input, wavelength transmission units λ [1A] OUT12− respectively corresponding to the respective signal input units (TP) 1, λ [2A] OUT12-2,..., Λ [nA] OUT12-n, and a wavelength multiplexing unit 40.

  The wavelength division multiplexing transmission apparatus B2 connected to the wavelength division multiplexing transmission apparatus A1 through the optical fiber 50 separates the wavelength division multiplexing signals transmitted from the wavelength division multiplexing transmission apparatus A1 through the optical fiber 50 into respective wavelengths. Wavelength receiving unit λ [1B] OUT13-1, λ [2B] OUT13-2,..., Λ [nB] OUT13 receiving the signals of the respective wavelengths separated by the wavelength separating unit 60. -N, signal output units (RP) 14-1, 14-2, ..., 14-n corresponding to each wavelength receiving unit, and each signal output unit (RP) is a terminal device [1B] 15-1, [2B] 15-2, ..., [nB] 15-n.

  [1A] 10-1, [2A] 10-2,..., [NA] 10-n and terminal devices [1B] 15-1, [2B] 15-2,. nB] If the communication path between 15-n is channel 1, channel 2,..., channel n, the signal input unit (TP) 11-1, wavelength transmitter unit λ [1A] OUT 12-1, signal The input unit (TP) 11-2 and the wavelength transmission unit λ [2A] OUT12-2,..., The signal input unit (TP) 11-n and λ [nA] OUT12-n are channel 1, channel 2,. .. An apparatus that receives a transmission signal of channel n and converts it to an optical signal of wavelengths λ1, λ2,..., Λn used in the wavelength division multiplexing system, and is described as “transmission transponder” in Patent Document 1. As shown, each channel is integrated with each other.

  Similarly, in the wavelength division multiplexing transmission apparatus B2 on the receiving side, the wavelength receiving unit λ [1B] OUT13-1, the signal output unit (RP) 14-1, the wavelength receiving unit λ [2B] OUT13-2, and the signal output unit ( RP) 14-2,..., Wavelength receiving unit λ [nB] OUT13-n and signal output unit (RP) 14-n are integrally configured for each channel, and wavelength λ1, λ2,. , Λn optical signals are decoded into signals suitable for each channel and output to the terminal devices [1B] 15-1, [2B] 15-2,..., [NB] 15-n.

  Therefore, in the conventional device configuration, when the signal from the terminal station device is input to the signal input unit (TP) and the transmission wavelength is assigned by the wavelength transmission unit, the transmission wavelength depends on the channel of the signal input unit (TP). Will be decided. A plurality of signals from each wavelength transmission unit are multiplexed by the wavelength multiplexing unit and transmitted through the optical fiber, but regenerative relay and ADD / DROP may be performed on the optical fiber. At that time, the same wavelength is used for the signals.

FIG. 11 is a diagram schematically illustrating a conventional WDM system that performs the above-described regenerative relay. Reference numerals 1 to 9 schematically represent channels, and the channel 9 is reserved.
The WDM transmission apparatus 1-1 and the WDM transmission apparatus 1-2 are connected via the regenerative relay apparatus 3. The regenerative repeater 3 includes a transmission / reception unit 3-1 on the WDM transmission apparatus 1-1 side that separates and decodes the wavelength division multiplexed signal transmitted from the WDM transmission apparatus 1-1 through the optical fiber 50-1. A WDM transmission apparatus 1- that reproduces (amplifies) each decoded channel signal and makes the reproduced signal a signal of each wavelength again, combines them, and sends them to the optical fiber 50-2. The transmission / reception unit 3-2 on the second side is configured. The above operation can be performed bidirectionally.

  In the above configuration, for example, the signal of channel 1 is transmitted through the optical fiber 50-1 at the wavelength assigned by the WDM transmission apparatus 1-1, and signal regeneration is performed by the regeneration unit corresponding to channel 1 in the regenerative repeater apparatus 3. It is transmitted to the channel 1 of the WDM transmission apparatus 1-2 through the optical fiber 50-2 at the same wavelength as that assigned by the transmission apparatus 1-1.

If a failure occurs in any of the working channels 1 to 8, the spare channel 9 is used, but the wavelength used by the spare channel 9 is also a fixed spare wavelength.
Thus, in the configuration of the conventional WDM system, the input signal channel and the transmission wavelength from the terminal equipment are fixed. Then, the same transmission wavelength and reception wavelength are used, and the wavelength of a signal assigned once does not change.
Japanese Patent Laid-Open No. 10-210008 JP 2000-115132 A

  In the conventional WDM system, the wavelength is assigned to each signal unit (channel) from the terminal equipment, so it is used in the section from the signal input section of the transmitting WDM transmission apparatus to the signal output section of the receiving WDM transmission apparatus. The wavelength is fixed, and the same wavelength is used on the transmission side and the reception side. For this reason, it is necessary to prepare a facility in which the effective bandwidth of the wavelength in the WDM section is integrated from the signal input unit to the signal output unit regardless of the operation system or the standby system.

  For this reason, the wavelength band used in the WDM system is limited by the system configuration, and if a failure occurs anywhere in the section from the signal input section to the signal output section, it is used in that section. All the facilities can no longer be used, and it is necessary to take measures such as replacing the faulty part or switching all the paths from the signal input part to the signal output part.

  Therefore, the present invention manages the wavelength of the WDM system so that the wavelength allocation within the system can be changed flexibly, and wavelength division multiplexing transmission that enables path change without requiring hardware replacement and connection work. Aim to provide equipment

According to the present invention, the wavelength allocating unit allocates the wavelength used in the wavelength division multiplexing method to the signal on the line between each terminal device by forming a connection between each signal input / output unit and each wavelength transmitting / receiving unit. When the wavelength management to execute a control for forming a connection between at least the state of the signal input portion and the wavelength transceiver monitors the signal input and output unit and the wavelength transceiver to the wavelength allocation unit based on the monitoring result A wavelength division multiplex transmission apparatus having a unit is provided.

  In addition, the wavelength management unit includes an allocation table for managing wavelengths used in the wavelength division multiplexing allocated to a signal on a line between each terminal device, each signal input unit, and each signal output unit A state management table that manages the states of each wavelength transmitter and each wavelength receiver in the usable state, the unusable state, and the in-use state, and generates an allocation table based on the information of the state management table. Based on the information in the table, the wavelength allocation unit can be configured to be controlled.

  According to the present invention, since wavelength allocation in the wavelength allocation unit can be executed by control by software in the wavelength management unit, channel or wavelength relocation can be dynamically switched without hardware replacement.

  Therefore, when a part of the section from the signal input section to the signal output section fails, the standby system can be effectively used as a shared path simply by changing the wavelength assignment. Can be built.

  Moreover, since wavelength allocation can be performed independently for each transmission section, the wavelength band in the WDM system can be used effectively.

  FIG. 1 is an overall configuration diagram of the present invention. As in the case of the conventional example shown in FIG. With the conventional example shown in FIG. 10, the wavelength division multiplexing transmission apparatus includes a wavelength allocation unit between the signal input unit (TP) and the wavelength transmission unit and between the wavelength reception unit and the signal output unit (RP), It is different in that it has a wavelength management unit that controls the wavelength by controlling the wavelength allocation unit, and the other parts are the same.

The overall configuration of the present invention will be described below with reference to FIG.
[1A] 10-1, [2A] 10-2,..., [NA] 10-n, and [1B] 15-1, [2B] 15-2,. nB] 15-n is a device for transmitting and receiving information signals such as voice and data as in the conventional case. Each terminal device may itself be a single terminal device, but may also be a device accommodating a plurality of terminal devices.

  The wavelength division multiplex transmission apparatus A100 is provided corresponding to the terminal equipment [1A] 10-1, [2A] 10-2,..., [NA] 10-n. Signal input units (TP) 11-1, 11-2,..., 11 -n that receive an optical signal, decode it into a signal in the apparatus, and input it to the wavelength allocation unit 20, and each signal input unit (TP) Are output to the wavelength transmitters λ [1A] OUT12-1, λ [2A] OUT12-2,..., Λ [nA] OUT12-n based on the control of the wavelength management unit 30. It has a wavelength allocation unit 20 for allocating signals of each channel from the signal input unit (TP) to the wavelength transmission unit, and a wavelength management table 300, and monitors the wavelength use status and availability status in its own apparatus, and the signal input unit (TP) and wavelength management unit 30 for allocating wavelength transmitting units and thereby controlling wavelength allocating unit 20, and wavelength allocating unit Wavelength transmitters λ [1A] OUT12-1, λ that convert signals output from 0 into optical signals of wavelengths λ1, λ2,..., Λn used in the wavelength division multiplexing system and output them to the wavelength multiplexer 40. [2A] OUT12-2,..., Λ [nA] OUT12-n, and a wavelength for multiplexing and multiplexing optical signals of a plurality of different wavelengths λ1, λ2,. It is composed of a multiplexing unit 40.

The signal wavelength-multiplexed by the wavelength multiplexing unit 40 is sent to the optical fiber 50 serving as an optical transmission line, and transmitted to the wavelength division multiplexing transmission apparatus B200.
The wavelength division multiplex transmission apparatus B200 demultiplexes the wavelength-multiplexed signal transmitted by the optical fiber 50 into optical signals of wavelengths λ1, λ2,. Wavelength receiving units λ [1B] OUT13-1, λ [2B] OUT13-2, which receive the signals of the respective wavelengths separated by the unit 60, decode them into signals in the apparatus, and output them to the wavelength allocation unit 21. ... Λ [nB] OUT13-n and signal input units (RP) 14-1, 14-2 corresponding to the respective channels based on the control of the wavelength management unit 31 based on the signals input from the wavelength receiving units, .., having a wavelength allocation unit 21 that outputs to 14-n and a wavelength management table 301, monitors the wavelength use status and availability status in its own apparatus, and allocates the signal output unit (RP) and the wavelength reception unit And a wavelength management unit 31 for controlling the wavelength allocation unit 21 by performing Station devices [1B] 15-1, [2B] 15-2,..., [NB] 15-n are provided to receive signals decoded by the wavelength receiver, , 14-n, which are signal output units (RP) 14-1, 14-2,.

The outline of the operation of communication and wavelength allocation in the above configuration is as follows.
A signal output from the terminal device [* A] (* is an arbitrary number from 1 to n; hereinafter the same) is input to the signal input unit [CH * A IN]. The signal input unit [CH * A IN] is allocated to each wavelength transmission unit [λ * A OUT] by the wavelength allocation unit 20 from the management information set in the wavelength management table 300. The wavelength management table 300 is updated with the information of the signal input unit [CH * A IN] and the wavelength transmission unit [λ * A OUT] assigned at this time, and is notified to the WDM transmission apparatus on the opposite side.

Similarly, all the signals of CH1A to CHnA are allocated, optical wavelength multiplexing is performed by the wavelength multiplexing unit 40, and the optical signal is transmitted to the optical fiber 50 that is an optical transmission line.
The signal transmitted through the optical transmission line is separated into each wavelength by the wavelength separation unit 60 and input to each wavelength reception unit [λ * B IN]. The signal input to the wavelength receiving unit [λ * B IN] is allocated to each signal output unit [CH * B OUT] by the wavelength allocation unit 21 from the management information set in the management table 301. At this time, the wavelength receiving unit [λ * B IN] and the signal output unit [CH * B OUT] are allocated based on the opposite-side signal allocation information or preset allocation information. The signal output from the signal output unit [CH * B OUT] is transmitted to the terminal device [* B].

  The wavelength assigning units 20 and 21 are realized by switches such as N × N. The wavelength management units 30 and 31 can be realized by a computer that executes a wavelength management program described later.

Next, the wavelength management unit 30 will be described with reference to FIG. 2 including not only the transmission side but also the reception side.
The wavelength management unit 30 includes a wavelength management table, a control unit 310, and a monitoring unit 320.

  The wavelength management table 300 includes an allocation table 320, a channel state management table 340, and a wavelength state management table 350 (sometimes collectively referred to as a state management table).

  In the allocation table 330, the IN part and the OUT part of each of the channels 1 to n, that is, the channels 1 to n of the signal input unit (TP) and the channels 1 to n of the signal output unit (RP) are assigned to which wavelength. It can be realized as an area on the memory of a computer for setting and storing. FIG. 2 shows the IN section (signal input section) and OUT section (signal output section) of channel 1, the entries from the IN section and OUT section of channel 2 to the IN section and OUT section of channel n in sequence, and the IN of wavelength 1 Entry (wavelength receiving part) and OUT part (wavelength transmitting part), IN part and OUT part of wavelength 2 to IN part and OUT part of wavelength n in order, one entry for channel or wavelength It is possible to arrange only the IN part and the OUT part.

  In addition, assuming that the optical fiber is used for transmission and reception separately in one direction, the allocation table 330 for allocating the wavelength 1 to the wavelength n is illustrated, but when the optical fiber is used bidirectionally, Since the wavelengths of the IN part and the OUT part must not be overlapped, another allocation method such as alternate transmission and reception wavelengths is used.

  The channel state management table 340 stores the IN and OUT portions of the channels 1 to n, that is, the states of the channels 1 to n of the signal input unit (TP) 11 and the channels 1 to n of the signal output unit (RP) 14. It can be realized as an area on the computer memory.

  The wavelength state management table 350 can be realized as an area on the memory of the computer that stores the IN and OUT parts of the wavelengths 1 to n, that is, the states of the wavelength receiver 13 and the wavelength transmitter 14.

  In the illustrated example, the state A is a usable state, the state B is in use, and the state C is an unusable state. These states transition from the state A to the state B or the state C and from the state B to the state A or the state C, as the state transition is described in the frame of the wavelength management table 300 in FIG. However, this indicates a soft movement, and if the hardware failure in the state C is recovered by replacement or the like, the state A is set in the state management table. is there.

  The control unit 310 performs processing for assigning the allocation setting of the transmission signal channel [i] and the wavelength [j] for transmitting it and the allocation setting of the reception signal channel [k] and the wavelength [m] for receiving it to the allocation table 330; The wavelength allocation unit 20 is controlled based on the contents of the allocation table 330, and the signal input unit [CHiA IN] 11, the wavelength transmission unit [λjA OUT] 12, the wavelength reception unit [λmB IN] 13, and the signal output unit [CHkB OUT] 14 is connected and wavelength assignment is executed. The control unit 310 also notifies the opposite device of the operation state of the own device.

  The monitoring unit 320 receives state notifications from the signal input unit (TP) 11, the signal output unit (RP) 14, the wavelength transmission unit 12, the wavelength reception unit 13, the wavelength allocation unit 20, and the like, thereby monitoring those states. Do. The monitoring unit 320 also monitors the transmission / reception state of the opposing device.

The monitoring unit 320 rewrites the state management table based on the monitoring result.
As described above, the wavelength management unit 30 can monitor and use the wavelength allocation status in the device itself, unit status management information (operating, ready for operation, in failure) in the device, and the wavelength allocation status in the opposite device. It manages channels and wavelengths, channels that can be used, and channels and wavelengths that are not usable. Further, the wavelength allocation unit 20 is controlled based on the information set in the wavelength management table 300.

Hereinafter, control of the wavelength allocation unit 20 and state transition of the signal input unit TP and the like will be further described.
In the control of the wavelength allocation unit 20, manual setting / switching and automatic setting / switching are possible according to the wavelength management table 300. In each setting, the wavelength depends on the state of each part, the wavelength allocation state of the opposite device, and the type of optical fiber. Can be selected and reassigned.

  Specifically, the signal input unit (TP) or the signal output unit (RP) in the usable state A is combined with the usable wavelength from the monitoring status of the apparatus or the system, and the signal input unit is combined with the wavelength allocation unit 20. (TP) or signal output unit (RP) and wavelength transmitting unit or wavelength receiving unit are allocated. When the signal input unit (TP) or signal output unit (RP) and the wavelength transmission unit or wavelength reception unit that are in the usable state A are assigned, the corresponding signal input unit (TP) or signal output unit (RP) and wavelength The transmitting unit or wavelength receiving unit shifts to state B, which is a status in use.

  When the in-use signal input unit (TP) or signal output unit (RP) and the wavelength transmission unit or wavelength reception unit are released, they shift to state A, which is a usable status, and can be reallocated. It becomes.

  When the signal input unit (TP) or signal output unit (RP) and the wavelength transmission unit or wavelength reception unit in the state A or the state B that is available or in use is in an abnormal state due to a failure or a line abnormality In this case, the state shifts to the state C which is the unusable state, and the wavelength cannot be assigned.

  In this case, the allocation of the signal input unit (TP) or signal output unit (RP) and the wavelength transmitting unit or wavelength receiving unit, which was in the state B in use, is released, and a normal one is usable depending on the individual state. As a standby state, the abnormal state shifts to state C, which is an unusable status.

  In the conventional system, since each channel and wavelength are fixedly assigned, if a failure occurs even at one location, the channel and wavelength cannot be used at all. As described above, the normal state depending on the individual state can be set to the standby state as the usable state A, and the wavelength band in the WDM system can be used effectively. The effectiveness of the present invention will be described later with further examples.

Next, a flow of a wavelength management program that causes a computer to execute the wavelength allocation process will be described with reference to FIGS.
FIG. 3 is a flowchart for manual setting.
First, in step S30, an operator inputs setting data of the allocation table 330 from an input device such as a console (not shown) connected to the wavelength management unit 30, and a signal input unit (TP), a signal output unit (RP), and wavelength transmission. Allocation of wavelength and wavelength receiving units is set in the allocation table 330. The setting data is created based on the line design data such as the type of optical fiber to be used and the wavelength allocation state of the opposite apparatus scheduled when the equipment is introduced.

  Next, the operator inputs a command for generating a state management table, and causes a computer (hereinafter simply referred to as a computer) that implements the wavelength management unit 30 to generate the state management table in step S31.

  The generation of the state management table (340, 350) in step S31 is performed based on the information of the monitoring unit 320 that has received the state notification of each unit, from the signal input unit (TP), the signal output unit (RP), the wavelength transmission unit, and the wavelength reception unit. This is done by setting the state. When the apparatus is activated (normally), each unit is in a state A (usable).

  Next, the operator inputs a command for wavelength allocation control, causes the computer to execute control of the wavelength allocation unit 20 in step S32, and receives the signal input unit (TP), wavelength transmission unit, signal output unit (RP), and wavelength reception. Assign parts. If the state of each part shown in the state management table (340, 350) is state A at the time of normal startup, the wavelength can be assigned to the transmission channel and the reception channel according to the setting data of the assignment table 330 set in step S30. Yes, the wavelength assignment is complete. If it is in state B or state C in the state management table (340, 350), the assignment of the part assigned to that part on the assignment table 330 in step S30 is suspended, and the wavelength assignment is incomplete. .

  Whether or not the wavelength allocation in step S32 has been completed is displayed on the console or the like, and the operator sees it and executes a command for executing the status management table change in step S33 or the steps after the allocation table generation in step S34. Enter the command to be executed.

In step S33, the states of the signal input unit (TP), the wavelength transmission unit, the signal output unit (RP), and the wavelength reception unit that have been assigned are changed from state A to state B.
In step S34, the state management table (340, 350) is searched for the portion whose allocation is suspended in step S32 to find a state A that can be combined with the reserved portion, and an allocation table is generated. . The order in which the above-mentioned parts are combined can be adopted in order from the youngest, or priorities can be given in advance, and the order can be selected according to the order.

Next, the process proceeds to step S35, and the allocation table 330 is changed for the portion allocated in step S34.
In the next step S36, the wavelength allocation control of the wavelength allocation unit 20 corresponding to the part newly allocated in steps S34 and S35 is executed.

  Finally, in step S37, the state of the state management tables (340, 350) of the signal input unit (TP), the wavelength transmission unit, the signal output unit (RP), and the wavelength reception unit that have been newly allocated is changed from the state A to the state. Change to B.

  In the above description, the processing from step S31 to step S34 is executed by an operator command input. However, it is obvious that the processing can be automatically executed by program control without using the operator.

Next, the flow at the time of automatic setting will be described with reference to FIG.
In the case of automatic setting, unlike the case of manual setting, the state management tables (340, 350) are generated prior to the allocation table 330. First, in step S40, the state management table is set by setting the states of the signal input unit (TP), the signal output unit (RP), the wavelength transmission unit, and the wavelength reception unit from the information of the monitoring unit 320 that has received the state notification of each unit. (340, 350) is generated. This is the same as step S31 in the case of manual setting, and each unit is set to state A (usable) when the apparatus is started (normal).

  Next, in step S41, the allocation table 330 is generated by the same logic as the allocation table generation in step S34 due to incomplete allocation at the time of manual setting. Although the allocation table generation in step S34 is for the portion for which allocation is suspended, the allocation table generation at the time of automatic setting is for the whole, and the allocation table 330 is generated literally.

  At this time, since the transmission wavelength and the reception wavelength are paired, the state of the wavelength transmission unit and the state of the wavelength reception unit of the same wavelength as the opposite device are stored, and the information of the allocation table 330 is stored by referring to the information. It is necessary to set the allocation data. For example, even if the wavelength transmitter 12-1 of the wavelength division multiplex transmission apparatus A100 illustrated in FIG. 1 is in the state A (usable), the wavelength reception unit of the wavelength division multiplex transmission apparatus B200 that is a counter device that is paired with the state A (usable) When 13-1 is in state B or C (in use or unavailable), the wavelength transmitter 12-1 cannot be assigned.

  As described above, a combination is created in consideration of the state of the opposing device, and the assignment is performed. As in the case of step S34, the order of combination is adopted in order from the lowest number, or priorities are assigned in advance. , You can choose according to the order.

  When the allocation table 330 is generated, the process proceeds to step S42, where the wavelength allocation unit 20 is controlled based on the generated allocation table 330, and the signal input unit (TP), the wavelength transmission unit, and the signal output unit (RP). And assign the wavelength receiver.

In step S43, the state of the signal input unit (TP), wavelength transmission unit, signal output unit (RP), and wavelength reception unit that have been assigned is changed from state A to state B, and the process ends.
Next, processing when a failure occurs will be described with reference to FIG.

  Processing when a failure occurs starts from receiving the failure occurrence notification in step S50. When a state change occurs in the signal input unit (TP), the signal output unit (RP), the wavelength transmission unit, and the wavelength reception unit of the own device during the operation of the device, a state change notification is sent to the monitoring unit 320 in the own device. Is called. The opposite device is notified of the operation status of the own device via the control device 310. Similarly, the monitoring unit 320 receives notification of a state change of the wavelength transmission unit and the wavelength reception unit of the opposite device.

  Next, in step S51, the monitoring unit 320 determines the signal input unit (TP), signal output unit (RP) and wavelength transmission unit of the own device, the state of the wavelength reception unit, and the state of the wavelength transmission unit and wavelength reception unit of the opposite device. collect.

  Next, in step S52, the state information collected by the monitoring unit 320 is reflected in the state management table (340, 350) to regenerate the state management table (340, 350). At that time, the part where the failure occurs transitions to state C. In addition, as described above, the wavelength transmission unit and the wavelength reception unit of the same wavelength pair are disabled at the same time, so when a failure occurs in the wavelength transmission unit of the opposite device, When the wavelength receiving unit is in the C state and a failure occurs in the wavelength receiving unit of the opposite device, the paired wavelength transmitting unit of the own device can be set in the C state so as not to be assigned.

  Next, in step S53, the allocation table 330 is regenerated based on the state management tables (340, 350) generated in step S52. That is, in the allocation table 330, the data of the portion that has transitioned from the state B to the state C or from the state A to the state C is cleared and the wavelength allocation is released.

  Thereafter, in the state management table (340, 350), the signal input unit (TP), the wavelength transmission unit, the signal output unit (RP), and the wavelength reception unit in the state A are combined, and allocation setting is performed in the allocation table 330. . As in the case of step S34, the order of combination can be adopted in order from the youngest number, or can be selected according to the order of priority given in advance.

  When this combination is performed, state C is set in the wavelength state management table 350 for the wavelength receiving unit or wavelength transmitting unit that is in an unusable state because the wavelength transmitting unit or wavelength receiving unit that is paired with the opposite device cannot be used. If this is done, there is no need to consider the state of the opposing device. Otherwise, it is necessary to store the state of the wavelength receiving unit and the wavelength transmitting unit of the opposite apparatus separately and refer to them when the allocation table is regenerated.

  When the regeneration of the allocation table 330 is completed, the process proceeds to step S54, where the wavelength allocation unit 20 is controlled based on the generated allocation table 330, and the signal input unit (TP), the wavelength transmission unit, and the signal output unit ( RP) and wavelength receiver are allocated.

  Next, in step S55, the state of the signal input unit (TP), the wavelength transmission unit, the signal output unit (RP), and the wavelength reception unit that have been assigned is changed from state A to state B, and the process ends.

Next, the regeneration of the allocation table at the time of failure will be described more specifically with an example.
Now, it is assumed that the WDM system shown in FIG. 1 is in operation, and the signal input unit (TP) 11-1 is assigned to the wavelength transmission unit λ [1A] OUT12-1. At this time, when a failure occurs in the signal input unit (TP) 11-1 and the state B changes to the state C, the wavelength transmission unit λ [1A] OUT 12-1 changes from the state B to the state A.

  If all signal input units (TP), wavelength transmission units, signal output units (RP), and wavelength reception units are in the state B before the failure occurs, they are combined with the wavelength transmission unit λ [1A] OUT12-1. Since there is no signal transmission unit (TP) in the state A, step S53 for regenerating the allocation table 330 is not performed, and subsequent steps S54 and S55 are not executed.

  However, before the failure of the signal input unit (TP) 11-1, there was a signal input unit (TP) that had transitioned from using the state B to the usable state A due to a failure of the wavelength transmission unit. In this case, one of them is selected and assigned to the wavelength transmitter λ [1A] OUT12-1.

  It is assumed that a failure has occurred in the wavelength transmission unit λ [1A] OUT12-1 this time with the same assumptions as above. The situation is the same as when a failure occurs in the signal input unit (TP) 11-1, but if the wavelength transmitter and the wavelength receiver have a redundant configuration such as 1: N, they can be reallocated immediately. It is.

Next, the WDM system of the present invention that performs regenerative relaying in the same manner as the conventional WDM system that performs regenerative relaying shown in FIG. 11 will be described with reference to FIG.
The WDM transmission apparatus 100-1 and the WDM transmission apparatus 100-2 are connected via a regenerative repeater 400. The regenerative repeater 400 includes a transmission / reception unit 400-1 on the WDM transmission apparatus 1-1 side that separates and decodes the wavelength division multiplexed signal transmitted from the WDM transmission apparatus 100-1 through the optical fiber 50-1. A WDM transmission apparatus 100- for reproducing (amplifying) each decoded channel signal and a reproduced signal as a signal of each wavelength again, combining them and sending them to the optical fiber 50-2 It is composed of a two-side transmitting / receiving unit 400-2.

  Reference numerals 1 to 9 of the WDM transmission apparatus 100-1, the WDM transmission apparatus 100-2, and the regenerative repeater 400 are the optical fiber 50-1 and the optical fiber 50-2 side, and the wavelength transmission / reception unit on the opposite side is the channel. The signal input / output unit is schematically shown. The connection between the signal input / output unit and the wavelength transmitting / receiving unit represents wavelength allocation. That is, the transmission / reception units 400-1 and 400-2 are provided with a wavelength transmission / reception unit, a wavelength allocation unit, a wavelength management unit, and a signal input / output unit similar to those of the wavelength division multiplex transmission apparatus of the present invention. Is variable.

  The state of the WDM system in FIG. 6 is that the first wavelength transmission / reception unit of the WDM transmission apparatus 100-1 or the first wavelength transmission / reception unit of the transmission / reception unit 400-1 of the regenerative repeater 400 has failed. −1, channel 1 is assigned to spare wavelength 9, and wavelength 9 is assigned again to channel 1 in transmission / reception unit 400-1 of regenerative repeater 400, and the assignment of other parts is the same as before the occurrence of the failure. It has become.

  Therefore, according to the present invention, the wavelength assignment can be made variable, so that in the state shown in the figure, the channel 9 and the wavelength 9 can be utilized as a backup between the regenerative repeater 400 and the WDM transmission apparatus 100-2.

Next, examples in which the WDM transmission apparatus of the present invention is applied to various system configurations will be described with reference to FIGS.
FIG. 7 is a diagram showing an example in which the WDM transmission apparatus according to the present invention is applied to a system having a PP configuration. In this configuration, the WDM transmission apparatus 70-1 and the WDM transmission apparatus 70-2 face each other one to one.

  In a normal state, the signal input / output unit 71-1 of channel 1 and the signal input / output unit 72-1 of channel 2 of the WDM transmission apparatus 70-1 respectively transmit and receive the wavelength λ1 wavelength transmission / reception unit 71-2 and wavelength λ2. The wavelength transmission / reception unit 71-2 and the wavelength transmission / reception unit 72-2 are assigned to the wavelength transmission / reception unit 71-3 and the wavelength transmission / reception unit 72-3 of the WDM transmission apparatus 70-2, which are opposite devices, respectively. It is connected.

  The signal input / output unit 71-4 for channel 1 and the signal input / output unit 72-4 for channel 2 of the WDM transmission apparatus 70-2 are the wavelength transmission / reception unit 71-3 for wavelength λ1 and the wavelength transmission / reception unit 72 for wavelength λ2, respectively. And the WDM transmission apparatus 70-2, which are respectively allocated to the signal input / output unit 71-1 of channel 1 and the signal input / output unit 72-1 of channel 2 of the WDM transmission apparatus 70-1. Communication is performed between the terminal devices accommodated by the signal input / output unit 71-4 of channel 1 and the signal input / output unit 72-4 of channel 2 respectively.

  The wavelength transmitter / receiver 73-2 of wavelength λn of the WDM transmission apparatus 70-1 and the wavelength transmitter / receiver 73-3 of wavelength λn of the WDM transmission apparatus 70-2 are spares, and the system of FIG. 7 adopts a 1: 2 spare configuration. is doing.

  According to the present invention, when a failure occurs in the wavelength λ1 system or the wavelength λ2 system, the wavelength assignment of the channel 1 or the channel 2 may be changed to the spare wavelength λn. Therefore, it is not necessary to provide a signal input / output unit for channel n as a spare configuration, and a terminal device accommodated in the signal input / output unit 71-1 for channel 1 or the signal input / output unit 72-1 for channel 2 is provided. Since there is no need to replace the signal input / output unit of channel n, a redundant configuration such as 1: N can be easily realized.

FIG. 8 is a diagram showing an example in which the WDM transmission apparatus according to the present invention is applied to a ring configuration system.
A WDM transmission apparatus A (80-1), a WDM transmission apparatus B (80-2), a WDM transmission apparatus C (80-3), and a WDM transmission apparatus D (80-4) are connected in a ring shape and accommodated in each. The terminal devices 81-1, 81-2, 81-3, and 81-4 are described as representatives. In such a configuration, a communication path 82 indicated by a thick line is set between the terminal station device 81-1 and the terminal device 81-2, and a dotted line is provided between the terminal device 81-2 and the terminal device 81-4. The communication paths 83-1 and 83-2 via the WDM transmission apparatus A (80-1) are set, and the WDM transmission indicated by a one-dot chain line between the terminal station apparatus 81-1 and the terminal station apparatus 81-3. Communication paths 84-1 and 84-2 through the device D (80-4) are set.

  According to the present invention, for example, the wavelength λ1 is allocated to the channel of the communication path 82, the wavelength λ2 is allocated to the channel of the communication path 83-1, the wavelength λ1 is allocated to the channel of the communication path 83-2, and the communication path 84-1. The wavelength λ2 can be assigned to the channel No. 1, and the wavelength λ1 can be assigned to the channel 84-2.

  Therefore, when a plurality of WDM transmission apparatuses are configured in a ring shape and each WDM transmission apparatus performs ADD / DROP, the wavelength band is effectively utilized by flexibly changing the wavelength arrangement on the optical fiber constituting the ring. It becomes possible.

FIG. 9 is a diagram showing an example in which the WDM transmission apparatus according to the present invention is applied to a mesh system.
WDM transmission device A (90-1), WDM transmission device B (90-2), WDM transmission device C (90-3), WDM transmission device D (90-4) are WDM transmission device A (90-1) Transmission line 91-1 between WDM transmission apparatus B (90-2) and WDM transmission apparatus A (90-1) and transmission line 91-4 between WDM transmission apparatus D (90-4) and WDM transmission apparatus A ( 90-1) and a WDM transmission apparatus C (90-3) 91-9, a transmission line 91-2 between the WDM transmission apparatus C (90-3) and the WDM transmission apparatus B (90-2), WDM, The transmission line 91-3 between the transmission apparatus C (90-3) and the WDM transmission apparatus D (90-4) is connected in a mesh shape.

  Even if the transmission path 91-3 between the WDM transmission apparatus C (90-3) and the WDM transmission apparatus D (90-4) fails and cannot be used, according to the present invention, the transmission path 91-4, The path can be changed flexibly according to the availability of the wavelength band such as the transmission path 91-5.

As described above in detail, the following wavelength management method is provided by the present invention.
1. Wavelengths that enable monitoring of each state by building a management table for the signal input unit and wavelength transmission unit, wavelength reception unit and signal output unit in the WDM transmission apparatus, and building a system by combining each unit individually Management method.

  2. In the above configuration, a wavelength management system that easily realizes a redundant configuration such as 1: N by individually managing and using a signal input unit and a wavelength transmission unit, and a wavelength reception unit and a signal output unit.

3. A wavelength management system that manages the wavelength usage status between a plurality of devices by providing a wavelength management table, and effectively uses the wavelength band used in one optical fiber.
4). A wavelength management method in which several paths can be selected for each wavelength in a system composed of a plurality of devices by providing a wavelength management table.

  5. Controls reception wavelength allocation by receiving the function of managing the wavelength usage state of the transmission side device and selecting an appropriate wavelength, the function of notifying the state of the transmission side device to the reception side device, and the state notification of the transmission side device Wavelength management method with functions.

(Appendix 1)
A signal input unit that is provided for each terminal device to be accommodated, inputs a signal on a line between the terminal devices and decodes the signal in the device, and the signal input provided for each wavelength used in wavelength division multiplexing. A wavelength transmission unit that converts the signal output from the unit into an optical signal having a wavelength used in the wavelength division multiplexing method, and combines the outputs of the wavelength transmission units to generate a wavelength division multiplexing signal and send it to the optical transmission line In the wavelength division multiplex transmission device including the wavelength multiplexing unit,
A wavelength allocation unit that allocates a wavelength to be used in the wavelength division multiplexing method to a signal on a line between each terminal device by forming a connection between each signal input unit and each wavelength transmission unit;
A wavelength that monitors at least the states of the signal input unit and the wavelength transmission unit, and performs control to cause the wavelength allocation unit to form a connection between the signal input unit and the wavelength transmission unit based on the monitoring result The management department,
A wavelength division multiplex transmission apparatus comprising:
(Appendix 2)
A wavelength demultiplexing unit that demultiplexes the wavelength division multiplexed signal transmitted from the optical transmission line into optical signals of each wavelength and performs demultiplexing;
A wavelength receiving unit that decodes an optical signal that is provided for each wavelength used in the wavelength division multiplexing system and demultiplexed by the wavelength demultiplexing unit into a signal in the apparatus;
A signal output unit that is provided for each terminal device to be accommodated, converts a signal output from the wavelength receiver to a signal suitable for each terminal device, and outputs the signal to a line between the terminal devices;
With
The wavelength allocator further uses a wavelength used in the wavelength division multiplexing method for a signal on a line between each terminal device by forming a connection between each signal output unit and each wavelength receiver. Assigned,
The wavelength management unit further monitors at least the states of the signal output unit and the wavelength receiving unit, and connects the signal output unit and the wavelength receiving unit to the wavelength allocation unit based on the monitoring result. The wavelength division multiplex transmission apparatus according to supplementary note 1, wherein control for forming the is performed.
(Appendix 3)
The wavelength management unit
An allocation table for managing wavelengths used in the wavelength division multiplexing system allocated to signals on the line between the terminal devices;
A state management table for managing the state of each signal input unit and each signal output unit, each wavelength transmission unit and each wavelength reception unit in an available state, an unusable state, and a busy state,
The wavelength division multiplexing transmission apparatus according to appendix 2, wherein the allocation table is generated based on information in the state management table, and the wavelength allocation unit is controlled based on the information in the allocation table.
(Appendix 4)
The wavelength management unit further includes a control unit and a monitoring unit,
The control unit generates a usable signal input unit and a usable wavelength transmitting unit, and a usable signal output unit and a usable wavelength receiving unit based on the information in the state management table. Then, an allocation table is generated by allocating the wavelength used in the wavelength division multiplexing method to the signal on the line between each terminal device by the generated combination, and the status of the own device is set to the opposite device. Notify
The monitoring unit monitors the status of each signal input unit, each signal output unit, each wavelength transmission unit, and each wavelength reception unit and manages information in the status management table, and also includes the wavelength allocation unit, The wavelength division multiplex transmission apparatus according to appendix 3, wherein the transmission / reception state of the opposite apparatus is monitored.
(Appendix 5)
When receiving the failure notification, the monitoring unit collects status information and generates a status management table reflecting the information,
The control unit refers to the information in the state management table, and combines a usable signal input unit and a usable wavelength transmitting unit, and a usable signal output unit and a usable wavelength receiving unit. Generating, assigning a wavelength to be used in the wavelength division multiplexing method to a signal on the line between each terminal device by the generated combination, regenerating the allocation table, and generating the regenerated allocation table The wavelength division multiplex transmission apparatus according to appendix 4, wherein the wavelength allocation unit is controlled based on the allocation information, and the information of the state management table is changed based on the allocation result.
(Appendix 6)
In a wavelength management program for causing a computer to execute the function of the state management unit described in Appendix 3,
A status information collection step for collecting the transmission / reception status of the opposite device and the status information of each unit in the own device;
State management that generates the state management table storing the states of the signal input units, the signal output units, the wavelength transmission units, and the wavelength reception units based on the information collected in the state information collection step A table generation step;
Based on the generated state management table, a combination of a usable signal input unit and a usable wavelength transmitting unit, and a usable signal output unit and a usable wavelength receiving unit is generated, An allocation table generating step for generating the allocation table for storing the allocation information of the wavelengths used in the wavelength division multiplexing method for the signals on the line between the terminal devices with the generated combinations;
By controlling the wavelength allocation unit based on the allocation information of the generated allocation table, the wavelength allocation unit is provided between the signal input units and the wavelength transmission units, and the signal output units and the respective units. a wavelength allocation control step of forming a connection between the wavelength reception unit,
From the usable state, the state stored in the state management table of each signal input unit and each wavelength transmission unit, and each signal output unit and each wavelength reception unit that are connected in the wavelength allocation control step A wavelength management program for causing the computer to execute a state management table changing step for changing to a busy state.
(Appendix 7)
The program according to appendix 6, wherein in the state management table generating step, the states of the wavelength transmitting unit and the wavelength receiving unit are stored as unusable states according to the transmission / reception state of the opposing device.
(Appendix 8)
In the allocation table generating step, the signals in the usable state are extracted in the signal input units and the signal output units according to a predetermined priority from the generated state management table, while the generated state In accordance with a predetermined priority order from the management table, the wavelength transmitters and the wavelength receivers that are usable are extracted, and the signal input unit and the wavelength transmitter, and the signal output unit and the wavelength that are sequentially extracted are extracted. If a combination of receiving units is generated, and the usable state cannot be extracted in each wavelength transmitting unit and each wavelength receiving unit, the process of the step is immediately terminated. 7. The wave according to appendix 6, wherein the process of generating the combination is repeated until no signal output unit can be used. Management program.
(Appendix 9)
A spare wavelength transmitter and a wavelength receiver, and when the wavelength transmitter or the wavelength receiver becomes unusable, the wavelength transmitter or wavelength receiver that is unusable; Supplementary note 2 characterized in that a connection between the signal input unit or signal output unit in which connection is formed in the wavelength allocation unit and the backup wavelength transmission unit or backup wavelength reception unit is formed in the wavelength allocation unit. The wavelength division multiplex transmission apparatus described.
(Appendix 10)
In a regenerative repeater in a wavelength division multiplex transmission system having a one-to-one configuration using the wavelength division multiplex transmission apparatus according to appendix 2,
The transmission / reception unit facing each wavelength division multiplexing transmission device is provided with a wavelength transmission / reception unit, a wavelength allocation unit, a wavelength management unit, and a signal input / output unit similar to the wavelength division multiplexing transmission device, and the allocation of signal channels and wavelengths is variable. A regenerative repeater characterized by that.

1 is an overall configuration diagram according to the present invention. It is a functional block diagram of a wavelength management part. It is a flowchart which sets a wavelength allocation manually. It is a flowchart which sets wavelength allocation automatically. It is a wavelength allocation flow chart at the time of failure occurrence. It is a regenerative relay system diagram according to the present invention. It is an application figure to the PP structure system of this invention. It is an application figure to the ring structure system of this invention. It is an application figure to the mesh composition system of the present invention. It is a whole block diagram by a prior art example. It is a regenerative relay system diagram according to a conventional example.

Explanation of symbols

1, 2 Conventional wavelength division multiplexing transmission device 3 Conventional regenerative repeater
10-1 to 10-n Terminal equipment
11-1 to 11-n Signal input section
12-1 to 12-n Wavelength transmitter
13-1 to 13-n Wavelength receiver
14-1 to 14-n Signal output section
15-1 to 15-n Terminal equipment 20, 21 Wavelength allocation unit 30, 31 Wavelength management unit 40 Wavelength multiplexing unit 50 Optical fiber 60 Wavelength separation unit
100,200 Wavelength division multiplexing apparatus of the present invention 300 Wavelength management table 310 Control unit 320 Monitoring unit 330 Allocation table 340 Channel state management table 350 Wavelength state management table 400 Regenerative repeater according to the present invention

Claims (5)

A signal input unit that is provided for each terminal device to be accommodated, inputs a signal on a line between the terminal devices and decodes the signal in the device, and the signal input provided for each wavelength used in wavelength division multiplexing. A wavelength transmission unit that converts the signal output from the unit into an optical signal having a wavelength used in the wavelength division multiplexing method, and combines the outputs of the wavelength transmission units to generate a wavelength division multiplexing signal and send it to the optical transmission line In the wavelength division multiplex transmission device including the wavelength multiplexing unit,
A wavelength allocation unit that allocates a wavelength to be used in the wavelength division multiplexing method to a signal on a line between each terminal device by forming a connection between each signal input unit and each wavelength transmission unit;
At least whether the state of the signal input unit and the wavelength transmission unit is a usable state, an unusable state, or a busy state, and monitors the wavelength allocation unit based on the monitoring result. A wavelength management unit that performs control to form a connection between the signal input unit and each wavelength transmission unit;
A wavelength division multiplex transmission apparatus comprising: A wavelength demultiplexing unit that demultiplexes the wavelength division multiplexed signal transmitted from the optical transmission line into optical signals of each wavelength and performs demultiplexing;
A wavelength receiving unit that decodes an optical signal that is provided for each wavelength used in the wavelength division multiplexing system and demultiplexed by the wavelength demultiplexing unit into a signal in the apparatus;
A signal output unit that is provided for each terminal device to be accommodated, converts a signal output from the wavelength receiver to a signal suitable for each terminal device, and outputs the signal to a line between the terminal devices;
With
The wavelength allocator further uses a wavelength used in the wavelength division multiplexing method for a signal on a line between each terminal device by forming a connection between each signal output unit and each wavelength receiver. Assigned,
The wavelength management unit further monitors whether at least the signal output unit and the wavelength receiving unit are in a usable state, an unusable state, or a busy state, and based on the monitoring result. The wavelength division multiplex transmission apparatus according to claim 1, wherein control is performed to cause the wavelength allocation unit to form a connection between each signal output unit and each wavelength reception unit. The wavelength management unit
An allocation table for managing wavelengths used in the wavelength division multiplexing system allocated to signals on the line between the terminal devices;
A state management table for managing the state of each signal input unit and each signal output unit, each wavelength transmission unit and each wavelength reception unit in an available state, an unusable state, and a busy state,
The wavelength division multiplexing transmission apparatus according to claim 2, wherein the allocation table is generated based on information in the state management table, and the wavelength allocation unit is controlled based on the information in the allocation table. In the wavelength management program which makes a computer perform the function of the wavelength management part of Claim 3,
A status information collection step for collecting the transmission / reception status of the opposite device and the status information of each unit in the own device;
State management that generates the state management table storing the states of the signal input units, the signal output units, the wavelength transmission units, and the wavelength reception units based on the information collected in the state information collection step A table generation step;
Based on the generated state management table, a combination of a usable signal input unit and a usable wavelength transmitting unit, and a usable signal output unit and a usable wavelength receiving unit is generated, An allocation table generating step for generating the allocation table for storing the allocation information of the wavelengths used in the wavelength division multiplexing method for the signals on the line between the terminal devices with the generated combinations;
By controlling the wavelength allocation unit based on the allocation information of the generated allocation table, the wavelength allocation unit is provided between the signal input units and the wavelength transmission units, and the signal output units and the respective units. A wavelength assignment control step for forming a connection between the wavelength receivers;
From the usable state, the state stored in the state management table of each signal input unit and each wavelength transmission unit, and each signal output unit and each wavelength reception unit that are connected in the wavelength allocation control step A wavelength management program for causing the computer to execute a state management table changing step for changing to a busy state.   In the allocation table generating step, the signals in the usable state are extracted in the signal input units and the signal output units according to a predetermined priority from the generated state management table, while the generated state In accordance with a predetermined priority order from the management table, the wavelength transmitters and the wavelength receivers that are usable are extracted, and the signal input unit and the wavelength transmitter, and the signal output unit and the wavelength that are sequentially extracted are extracted. If a combination of receiving units is generated, and the usable state cannot be extracted in each wavelength transmitting unit and each wavelength receiving unit, the process of the step is immediately terminated. 5. The process of generating the combination is repeated until it becomes impossible to extract a usable state in the signal output unit. Length management program.