WO2015008512A1 - 伝送装置、伝送システムおよび経路切替方法 - Google Patents
伝送装置、伝送システムおよび経路切替方法 Download PDFInfo
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- WO2015008512A1 WO2015008512A1 PCT/JP2014/060070 JP2014060070W WO2015008512A1 WO 2015008512 A1 WO2015008512 A1 WO 2015008512A1 JP 2014060070 W JP2014060070 W JP 2014060070W WO 2015008512 A1 WO2015008512 A1 WO 2015008512A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
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- the present invention relates to a transmission apparatus that transmits an optical signal, and more particularly, to a wavelength division multiplexing transmission apparatus that supports a line redundancy system capable of switching paths in order to avoid a failure.
- a line redundancy method is known as a method for improving reliability related to transmission of a WDM (Wavelength Division Multiplexing) signal by switching a route for transmitting a WDM signal to avoid a failure. Yes.
- WDM Widelength Division Multiplexing
- a wavelength multiplexing transmission apparatus serving as a receiving end that receives a WDM signal usually detects a path failure.
- a wavelength division multiplex transmission apparatus at a receiving end that receives a WDM signal monitors each input optical level of an optical wavelength signal in a WDM signal input from each of a plurality of paths using an optical monitoring apparatus. Based on the monitoring result, it is detected whether or not the optical wavelength signal is blocked.
- the wavelength division multiplexing transmission apparatus determines that a failure has occurred in the operation path, and transmits the WDM signal.
- the transmission route is switched from the active route to the standby route.
- the above line redundancy method only detects a failure based on the input light level, so it cannot monitor the frame error or bit error of the optical signal, and cannot accurately detect the failure. There's a problem.
- Patent Document 1 discloses a communication device that can detect a frame error and a bit error of an optical signal.
- the communication apparatus includes a plurality of optical couplers provided corresponding to each of a plurality of paths, and a plurality of monitoring devices provided corresponding to each of the plurality of paths.
- the one optical signal is branched, one is output to a predetermined route, and the other is input to the monitoring device corresponding to its own route.
- Each monitoring device analyzes the input optical signal and detects a frame error or a bit error.
- Patent Document 1 has a problem that the scale and cost of the communication device increase because a monitoring device for analyzing the optical signal must be provided for each path.
- an optical wavelength converter for relay that performs regenerative relay processing on a WDM signal may be provided on the path.
- the optical wavelength conversion unit that performs regenerative repeat processing in the optical wavelength conversion device for relay correctly corrects the failure with the optical wavelength multiplexing transmission device at the receiving end.
- a general wavelength multiplexing transmission apparatus extracts an optical wavelength signal that needs to be converted from a WDM signal, and outputs it to an optical wavelength conversion unit that converts the wavelength of the extracted optical wavelength signal.
- a wavelength division multiplexing transmission apparatus that outputs a WDM signal as it is to an optical wavelength converter.
- the WDM signal is input as it is to the optical monitoring device that monitors the optical level, and even when a specific optical wavelength signal is blocked, the blockage is detected due to the influence of other optical wavelength signals. There are concerns that cannot be made.
- An object of the present invention is to provide a transmission apparatus, a transmission system, and a path switching method that can solve at least the problem that the scale and cost of a communication apparatus increase.
- a transmission apparatus is provided with a plurality of paths corresponding to a plurality of paths for transmitting wavelength multiplexed signals in which a plurality of optical wavelength signals having different wavelengths are combined, and the wavelength multiplexed signals transmitted through the corresponding paths.
- an optical monitoring unit that detects an optical level of an optical wavelength signal included in the wavelength multiplexed signal, and any one of the plurality of paths is selected, and the wavelength multiplexed signal or the wavelength multiplexed signal transmitted through the selected path is selected. Based on the switching unit that outputs the included optical wavelength signal as an optical signal, the light level detected by the optical monitoring unit, and the optical signal output from the switching unit, a fault that has occurred in each path is detected.
- a signal processing unit that switches a path selected by the switching unit according to the detection result.
- the transmission system is provided with a plurality of paths corresponding to each of a plurality of paths for transmitting wavelength multiplexed signals in which a plurality of optical wavelength signals having different wavelengths are combined, and the wavelength multiplexed signals transmitted through the corresponding paths.
- an optical monitoring unit that detects an optical level of an optical wavelength signal included in the wavelength multiplexed signal, and any one of the plurality of paths is selected, and the wavelength multiplexed signal or the wavelength multiplexed signal transmitted through the selected path is selected. Based on the monitoring result of the optical level by the optical monitoring unit and the optical signal output from the switching unit, a failure occurring in each path is detected based on the switching unit that outputs the included optical wavelength signal as an optical signal.
- a signal processing unit that switches a path selected by the switching unit according to the detection result, and a plurality of relay transmission devices belonging to each of the plurality of paths. And, with a.
- the path switching method detects the optical level of a wavelength multiplexed signal in which a plurality of optical wavelength signals having different wavelengths transmitted through each of a plurality of paths are combined or an optical wavelength signal included in the wavelength multiplexed signal. Selecting one of the plurality of paths, outputting a wavelength multiplexed signal transmitted through the selected path or an optical wavelength signal included in the wavelength multiplexed signal as an optical signal, and detecting the detected optical level; Based on the output optical signal, a failure occurring in each path is detected, and the selected path is switched according to the detection result.
- FIG. 1 is a diagram showing a wavelength division multiplexing transmission system according to an embodiment of the present invention.
- the wavelength division multiplexing transmission system shown in FIG. 1 is a transmission system that transmits WDM signals, and includes wavelength division multiplexing transmission apparatuses 1 to 4.
- the WDM signal is transmitted from the wavelength division multiplexing transmission apparatus 1 to the wavelength division multiplexing transmission apparatus 3.
- the path from the wavelength division multiplexing transmission apparatus 1 to the wavelength division multiplexing transmission apparatus 3 includes a path A where the wavelength division multiplexing transmission apparatus 2 is interposed and a path B where the wavelength division multiplexing transmission apparatus 4 is interposed.
- the wavelength division multiplexing transmission device 1 is a transmission device serving as a transmission end that transmits a WDM signal.
- the wavelength multiplexing transmission apparatus 1 includes a plurality of optical wavelength conversion units 11, optical wavelength multiplexing units 12A and 12B, wavelength monitoring units 13A and 13B, a monitoring control unit 14, and optical monitoring control units 15A and 15B.
- the plurality of optical wavelength conversion units 11 and the monitoring control unit 14 have a configuration common to the paths A and B, and the optical wavelength multiplexing unit 12A, the wavelength monitoring unit 13A, and the optical monitoring control unit 15A correspond to the path A.
- the optical wavelength multiplexing unit 12B, the wavelength monitoring unit 13B, and the optical monitoring control unit 15B are configurations corresponding to the path B.
- Each optical wavelength converter 11 receives a client signal, which is an optical signal having a specific wavelength, from a client device (not shown) such as a router. Each optical wavelength converter 11 converts the wavelength of the inputted client signal into a wavelength for WDM signal, and outputs the client signal obtained by converting the wavelength as an optical wavelength signal. In addition, the wavelength of the optical wavelength signal which each optical wavelength conversion part 11 outputs differs from each other.
- Each optical wavelength conversion unit 11 specifically includes a signal processing unit 111 and a coupler unit 112.
- the client signal is input to the signal processing unit 111.
- the signal processing unit 111 converts the wavelength of the input client signal into a wavelength for the WDM signal, and outputs the client signal obtained by converting the wavelength as an optical wavelength signal.
- the coupler unit 112 branches the optical wavelength signal output from the signal processing unit 111 into two, outputs one optical wavelength signal to the optical wavelength multiplexing unit 12A of the path A, and transmits the other optical wavelength signal of the path B. It outputs to the optical wavelength multiplexing part 12B.
- the optical wavelength multiplexer 12A multiplexes the optical wavelength signals output from the optical wavelength converters 11 to generate a WDM signal obtained by multiplexing the optical wavelength signals, and outputs the generated WDM signal. .
- the wavelength monitoring unit 13A detects each wavelength of the optical wavelength signal included in the WDM signal generated by the optical wavelength multiplexing unit 12A, and notifies the optical monitoring control unit 15A of the wavelength via the monitoring control unit 14. Specifically, the wavelength monitoring unit 13A, for each wavelength of all the optical wavelength signals that can be included in the WDM signal, has its wavelength included in the WDM signal generated by the optical wavelength multiplexing unit 12A. Whether the wavelength actually exists is detected.
- the monitoring control unit 14 detects a failure that occurs in each optical wavelength conversion unit 11, and notifies the failure to the optical monitoring control units 15A and 15B.
- the optical supervisory control unit 15A generates an optical supervisory signal indicating the wavelength and the failure notified from each of the wavelength supervisory part 13A and the supervisory controller 14, and the optical supervisory signal is output from the optical wavelength multiplexer 12A. Are combined and output.
- the optical wavelength multiplexing unit 12B, the wavelength monitoring unit 13B, and the optical monitoring control unit 15B have the same functions as the optical wavelength multiplexing unit 12A, the wavelength monitoring unit 13A, and the optical monitoring control unit 15A.
- the same processing as that performed by the optical wavelength multiplexing unit 12A, the wavelength monitoring unit 13A, and the optical monitoring control unit 15A is performed on the WDM signal output to.
- the wavelength division multiplexing transmission apparatus 2 is a relay transmission apparatus that relays a WDM signal.
- the wavelength multiplexing transmission apparatus 2 includes a wavelength monitoring unit 21, an optical wavelength separation unit 22, a plurality of optical wavelength conversion units 23, an optical wavelength multiplexing unit 24, a wavelength monitoring unit 25, a monitoring control unit 26, and an optical monitoring. And a control unit 27.
- the wavelength monitoring unit 21 detects each wavelength of the optical wavelength signal included in the WDM signal output from the wavelength multiplexing transmission apparatus 1 and notifies the optical monitoring control unit 27 of the wavelength via the monitoring control unit 26. Specifically, for each wavelength of all optical wavelength signals that can be included in the optical wavelength multiplexed signal, the wavelength monitoring unit 21 includes the wavelength in the WDM signal output from the wavelength multiplexing transmission device 1. It is detected whether it actually exists as the wavelength of the optical wavelength signal.
- the optical wavelength demultiplexing unit 22 demultiplexes the WDM signal output from the wavelength multiplexing transmission apparatus 1 into an optical wavelength signal and an optical monitoring signal included in the WDM signal, and outputs the demultiplexed signals. At this time, the optical wavelength separation unit 22 outputs the optical monitoring signal to the monitoring control unit 26 and outputs each of the optical wavelength signals to each optical wavelength conversion unit 23.
- Each optical wavelength converter 23 is sometimes called a regenerative repeater.
- Each optical wavelength converter 23 corresponds to each wavelength of the optical wavelength signal, performs regenerative relay processing on the optical wavelength signal having the corresponding wavelength, and outputs the optical wavelength signal subjected to the regenerative relay processing.
- the regenerative relay process is, for example, a 3R relay process. Note that the 3R relay processing includes equalization (Reshaping) processing, retiming processing, and identification regeneration (Regenerating) processing.
- each optical wavelength converter 23 performs a detection process for detecting a failure that has occurred in the path A based on an optical wavelength signal having a corresponding wavelength.
- each optical wavelength conversion unit 23 When a failure is detected in the detection process, each optical wavelength conversion unit 23 outputs an alarm signal indicating the failure as an optical wavelength signal, or the optical monitoring control unit 26 detects the failure via the monitoring control unit 26. Notification processing to notify 27 is performed. More specifically, in each optical wavelength converter 23, the path A to which the wavelength division multiplexing transmission device 2 belongs is an active path that is currently used for transmission of WDM signals, or a fault occurs in the active path. A route flag indicating whether the route is a standby route to be switched when an error occurs is set. Each optical wavelength conversion unit 23 performs output processing when the route flag indicates an active route, and performs notification processing when the route flag indicates a standby route.
- the alarm signal output in the output process is an AIS (alarm indication signal) signal or a signal corresponding thereto, and is preferably a signal having a wavelength corresponding to the optical wavelength converter 23.
- AIS alarm indication signal
- the optical wavelength multiplexer 24 multiplexes the optical wavelength signals output from the optical wavelength converters 23 to generate a WDM signal obtained by multiplexing the optical wavelength signals, and outputs the generated WDM signal. .
- the wavelength monitoring unit 25 detects each wavelength of the optical wavelength signal included in the WDM signal generated by the optical wavelength multiplexing unit 24 and notifies the optical monitoring control unit 27 of the wavelength via the monitoring control unit 26. Specifically, for each wavelength of all optical wavelength signals that can be included in the WDM signal, the wavelength monitoring unit 25 has an optical wavelength signal whose wavelength is included in the WDM signal generated by the optical wavelength multiplexing unit 12A. It is detected whether or not it exists as a wavelength.
- the supervisory control unit 26 detects a fault that has occurred in the wavelength division multiplex transmission device 1 based on the optical supervisory signal from the optical wavelength demultiplexing unit 22 and notifies the optical supervisory control unit 27 of the fault. Also, the supervisory control unit 26 receives setting information indicating whether the path A is the active system from the wavelength division multiplex transmission apparatus 3, and changes the path flag set in each optical wavelength conversion unit 23 based on the information. To do.
- the optical monitoring control unit 27 generates an optical monitoring signal indicating a failure and a wavelength notified from each of the optical wavelength conversion units 23, the wavelength monitoring unit 25, and the monitoring control unit 26, and the optical monitoring signal is transmitted to the optical wavelength multiplexing unit.
- the signal is combined with the WDM signal output from 12A and output.
- the wavelength multiplexing transmission device 4 is a relay transmission device that relays WDM signals.
- the wavelength multiplexing transmission device 4 includes a wavelength monitoring unit 41, an optical wavelength separation unit 42, a plurality of optical wavelength conversion units 43, an optical wavelength multiplexing unit 44, a wavelength monitoring unit 45, a monitoring control unit 46, and an optical monitoring control. Part 47.
- Each part of the wavelength division multiplexing transmission device 4 has the same function as that of the configuration of the same name of the wavelength division multiplexing transmission device 2, and performs the same processing as the configuration of the same name on the WDM signal transmitted through the path B. Do.
- the wavelength division multiplexing transmission device 3 is a transmission device serving as a receiving end of the WDM signal.
- the wavelength multiplexing transmission apparatus 3 includes optical monitoring control units 31A and 31B, optical wavelength separation units 32A and 32B, a plurality of optical wavelength conversion units 33, and a monitoring control unit 34.
- the optical monitoring control unit 31A and the optical wavelength separation unit 32A have a configuration corresponding to the path A, and the optical monitoring control unit 31B and the optical wavelength separation unit 32B have a configuration corresponding to the path B.
- the control unit 34 has a configuration common to the routes A and B.
- the optical supervisory control unit 31A is an acquisition unit that acquires an optical supervisory signal from the WDM signal output from the wavelength division multiplex transmission device 2.
- the optical monitoring control unit 31A notifies the optical wavelength conversion unit 33 of the failure and wavelength indicated by the acquired optical monitoring signal via the monitoring control unit 34.
- the optical wavelength demultiplexing unit 32A demultiplexes the WDM signal output from the wavelength division multiplex transmission device 2 into an optical wavelength signal and an optical monitoring signal included in the WDM signal, and each of the demultiplexed optical wavelength signals. Output to the optical wavelength converter 33.
- the optical supervisory control unit 31B and the optical wavelength demultiplexing unit 32B have the same functions as the optical supervisory control unit 31A and the optical wavelength demultiplexing unit 32B, and for the WDM signal that transmits the path B output from the wavelength division multiplexing transmission device 2 Then, the same processing as that of the optical monitoring control unit 31B and the optical wavelength separation unit 32B is performed.
- Each optical wavelength converter 33 corresponds to each of the wavelengths of the optical wavelength signal, and receives the optical wavelength signal having the corresponding wavelength from both of the optical wavelength separators 32A and 32B.
- Each optical wavelength converter 33 selects one of paths A and B, and an optical wavelength signal demultiplexed from the WDM signal transmitted through the selected path, that is, optical wavelength separation corresponding to the selected path.
- the optical wavelength signal received from the unit 32A or 32B is output as a client signal to a client device (not shown).
- Each of the optical wavelength converters 33 specifically includes optical monitoring units 331A and 331B, a switching unit 332, and a signal processing unit 333.
- the optical monitoring unit 331A has a configuration corresponding to the path A
- the optical monitoring unit 331B has a configuration corresponding to the path B.
- the optical monitoring unit 331A detects the optical level of the optical wavelength signal received from the optical wavelength demultiplexing unit 32A, and outputs the optical level to each signal processing unit 333 via the monitoring control unit 34.
- the light monitoring unit 331B detects the light level of the light wavelength signal received from the light wavelength separation unit 32B, and outputs the light level to each signal processing unit 333 via the monitoring control unit 34.
- the switching unit 332 selects one of the paths A and B, and outputs an optical wavelength signal demultiplexed from the wavelength multiplexed signal transmitted through the selected path.
- the signal processing unit 333 converts the wavelength of the optical wavelength signal output from the switching unit 332 into a wavelength for the client device, and outputs the converted optical wavelength signal to the client device. Since the optical wavelength signal in the wavelength multiplexed signal transmitted through the path selected by the switching unit 332 is output to the client device, the path selected by the switching unit 332 is the active system path. Become.
- the signal processing unit 333 is based on the failure and wavelength notified from the optical monitoring control units 31A and 31B, the optical level notified from the optical monitoring units 331A and 331B, and the optical wavelength signal output from the switching unit 332.
- the failure occurring in each of the routes A and B is detected, and the route selected by the switching unit 332 is switched based on the detection result.
- the signal processing unit 333 sets the route selected by the switching unit 332 as an active route, sets the route not selected by the switching unit 332 as a standby route, and indicates the setting.
- the setting information is notified to the monitoring control unit 34.
- the signal processing unit 333 detects a failure that has occurred in the operating system path based on the optical wavelength signal output from the switching unit 332. At this time, the signal processing unit 333 determines whether or not the optical wavelength signal is an alarm signal. If the optical wavelength signal is an alarm signal, the signal processing unit 333 determines that a failure has occurred in the operation path. If the optical wavelength signal is not an alarm signal, the optical wavelength signal is analyzed to detect whether the optical wavelength signal has an error (for example, at least one of a frame error and a bit error). It is determined that a failure has occurred on the active route. Note that the signal processing unit 333 may use not only the optical wavelength signal but also the information notified from the optical monitoring control unit and the optical monitoring unit corresponding to the path of the active system for detection of the failure.
- the standby path is not connected to the standby path to each signal processing unit 333, and therefore is different from the failure detection by the active path A.
- the signal processing unit 333 determines the light level notified from the optical monitoring unit corresponding to the standby path and the failure and wavelength notified from the optical monitoring control unit 31A corresponding to the standby path. Based on this, a failure in the backup path is detected. For example, when the light level falls below a predetermined threshold, when a failure is notified from the light monitoring control unit 31A, or when the wavelength notified from the light monitoring control unit 31A no longer exists, the path of the standby system Detect failure.
- the monitoring control unit 34 notifies the setting information from each signal processing unit 333 to the monitoring control units 26 and 46 of the wavelength division multiplexing transmission apparatuses 2 and 4.
- the coupler unit 112 and the switching unit 332 are described as being provided inside the optical wavelength conversion units 11 and 33, but may be provided outside them. Further, in the present embodiment, the coupler unit that combines the WDM signal and the optical monitoring signal is described as being provided in the optical monitoring control units 15A, 15B, 27, and 47. However, the coupler unit may be provided outside them. Good.
- optical wavelength conversion unit 23 and 43 may not be provided or may be provided in multiple stages.
- Each of the wavelength division multiplexing transmission apparatuses 2 and 4 may be provided in multiple stages.
- the optical wavelength demultiplexing units 22, 42, 32A and 32B output the WDM signal after separating it into the optical wavelength signal
- the WDM signal may be output as it is.
- the switching unit 332 outputs the wavelength multiplexed signal transmitted through the selected path as it is. Therefore, the switching unit 332 selects any one of a plurality of paths, and outputs the wavelength multiplexed signal transmitted through the selected path or the optical wavelength signal included in the wavelength multiplexed signal as an optical signal.
- the WDM signal is transmitted in one direction from the wavelength division multiplexing transmission apparatus 1 to the wavelength division multiplexing transmission apparatus 3 in order to simplify the description. It is desirable that the WDM signal be configured to be bidirectional so that the WDM signal is transmitted from the wavelength division multiplexing transmission apparatus 3 to the wavelength division multiplexing transmission apparatus 1 as well.
- 2 to 5 are diagrams for explaining the operation of the wavelength division multiplexing transmission system.
- the route A is used as an active route and the route B is used as a standby route.
- each optical wavelength conversion unit 23 of the wavelength division multiplexing transmission apparatus 2 when the path A is disconnected between the wavelength division multiplexing transmission apparatuses 1 and 2 as shown in FIG. 2, each optical wavelength conversion unit 23 of the wavelength division multiplexing transmission apparatus 2 generates an alarm signal to generate an optical signal. It outputs to the optical wavelength multiplexing part 24 as a wavelength signal.
- each signal processing unit 333 of the wavelength division multiplexing apparatus 3 detects that a failure has occurred in the path A because the optical wavelength signal is an alarm signal.
- each signal processing unit 333 since no failure has occurred in the route B, each signal processing unit 333 switches the route selected by each switching unit 332 from the route A to the route B. As a result, it is possible to avoid a failure that has occurred in the route A.
- each signal processing unit 333 recognizes that a failure has occurred in the path B based on the notified detection result.
- each signal processing unit 333 detects that a failure has occurred in the route A, as in the example of FIG. In this case, since a failure has occurred in the route B, each signal processing unit 333 does not switch the route selected by the switching unit 332.
- the wavelength monitoring unit 45 in the wavelength division multiplexing transmission device 4 causes the optical wavelength conversion unit 43 in which the failure occurs in the output unit.
- the corresponding wavelength is not detected, and this is reflected in the optical monitoring signal output from the optical monitoring control unit 47.
- the failure in the output unit of the optical wavelength conversion unit 43 is notified to the signal processing unit 333 of the optical wavelength conversion unit 33 via the optical monitoring control unit 31B and the monitoring control unit 34 in the wavelength multiplexing transmission device 3. It is recognized that a failure has occurred in path B.
- the optical monitoring unit 331B of the optical wavelength conversion unit 33 corresponding to the wavelength corresponding to the optical wavelength conversion unit 43 in which the failure has occurred in the output unit also detects that the optical level of the optical wavelength signal having the wavelength has decreased. Therefore, the signal processing unit 333 also detects a failure by using the light level notified from the light monitoring unit 331B.
- each signal processing unit 333 detects that a failure has occurred in the route A in the same manner as in the example of FIG. In this case, since a failure has occurred in the route B, each signal processing unit 333 does not switch the route selected by the switching unit 332.
- the optical wavelength demultiplexing units 32A and 32B When the optical wavelength demultiplexing units 32A and 32B output the WDM signal as it is, it may be difficult for the optical monitoring units 331A and 331B to detect a decrease in the optical level. For this reason, since the failure cannot be accurately detected only by the light monitoring units 331A and 331B, in this embodiment, not only the light monitoring units 331A and 331B but also the light monitoring control units 31A and 31B are used for detecting the failure. Yes.
- the optical wavelength conversion unit 43 in the wavelength division multiplexing transmission apparatus 4 detects a failure, and an optical monitoring signal indicating the failure is an optical signal.
- the monitoring control unit 47 transmits the signal to the optical monitoring control unit 31B in the downstream wavelength division multiplex transmission apparatus 3, and the failure is notified to each signal processing unit 333 via the monitoring control unit 34, and the failure occurs in the path B. It is recognized.
- each signal processing unit 333 detects that a failure has occurred in the route A in the same manner as in the example of FIG. In this case, since a failure has occurred in the route B, each signal processing unit 333 does not switch the route selected by the switching unit 332.
- the wavelength multiplexed signal transmitted through the selected path or the optical wavelength signal included in the wavelength multiplexed signal, and the wavelength multiplexed signal transmitted through each path or the wavelength multiplexed signal are transmitted. Since the failure is detected based on the optical wavelength signal included in the signal, it is not necessary to provide a signal processing unit for analyzing the wavelength multiplexed signal or the optical wavelength signal for each path, thereby increasing the scale and cost of the communication device. It becomes possible to suppress. It is also possible to detect a frame error, a bit error, etc. of the wavelength multiplexed signal transmitted through the operational transmission line.
- the optical monitoring signal indicating the failure is combined with the WDM signal and notified from the upstream to the downstream, the configuration in which the WDM signal is output to the optical wavelength conversion unit as it is is based on the optical monitoring signal. It becomes possible to detect the failure.
- an alarm signal indicating the failure is output as a wavelength optical signal. Since the wavelength optical signal does not need to be blocked, it is possible to suppress the optical level of the WDM signal from changing suddenly and affecting the WDM signal transmitted through another path.
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Abstract
Description
11、23、33、43 光波長変換部
12A、12B、24、44 光波長多重部
13A、13B、21、41 波長監視部
14、26、34、46 監視制御部
15A、15B、25、45、47、31A、31B 光監視制御部
22、42、32A、32B 光波長分離部
111、333 信号処理部
112 カプラ部
331A、331B 光監視部
332 切替部
Claims (9)
- 波長が異なる複数の光波長信号が合波された波長多重信号を伝送する複数の経路のそれぞれに対応して複数設けられ、当該対応する経路を伝送してきた波長多重信号または当該波長多重信号に含まれる光波長信号の光レベルを検知する光監視部と、
前記複数の経路のいずれかを選択し、当該選択した経路を伝送してきた波長多重信号または当該波長多重信号に含まれる光波長信号を光信号として出力する切替部と、
前記光監視部にて検知された光レベルと、前記切替部から出力された光信号に基づいて、各経路で発生した障害を検知し、当該検知結果に応じて、前記切替部にて選択される経路を切り換える信号処理部と、を有する伝送装置。 - 前記信号処理部は、前記光信号を解析して、当該光信号にビットエラーおよびフレームエラーの少なくとも一方があると、前記切替部にて選択された経路の障害を検知する、請求項1に記載の伝送装置。
- 前記波長多重信号には、当該波長多重信号に含まれる複数の光波長信号の波長のそれぞれを示す光監視信号が合波され、
前記複数の経路のそれぞれに対応して複数設けられ、当該対応する経路を伝送してきた波長多重信号から前記光監視信号を取得する取得部をさらに有し、
前記信号処理部は、前記取得部が取得した光監視信号にさらに基づいて、前記障害を検知する、請求項1または2に記載の伝送装置。 - 前記信号処理部は、前記光監視信号が示す波長が存在しなくなった場合、当該光監視信号を含む波長多重信号を伝送してきた経路の障害を検知する、請求項3に記載の伝送装置。
- 前記切替部にて選択された経路を伝送してきた波長多重信号には、当該経路で生じた障害を示す信号が前記光波長信号として含まれ、
前記切替部にて選択された経路以外に経路を伝送してきた波長多重信号には、当該経路で生じた障害をさらに示す前記光監視信号が合波されている、請求項3または4に記載の伝送装置。 - 波長が異なる複数の光波長信号が合波された波長多重信号を伝送する複数の経路のそれぞれに対応して複数設けられ、当該対応する経路を伝送してきた波長多重信号または当該波長多重信号に含まれる光波長信号の光レベルを検知する光監視部と、
前記複数の経路のいずれかを選択し、当該選択した経路を伝送してきた波長多重信号または当該波長多重信号に含まれる光波長信号を光信号として出力する切替部と、
前記光監視部による前記光レベルの監視結果と、前記切替部から出力された光信号に基づいて、各経路で発生した障害を検知し、当該検知結果に応じて、前記切替部にて選択される経路を切り換える信号処理部と、を有する伝送装置と、
前記複数の経路のそれぞれに所属する複数の中継用伝送装置と、を有する伝送システム。 - 各中継用伝送装置は、
前記波長多重信号に含まれる複数の光波長信号の波長のそれぞれを検知する波長監視部と、
前記波長監視部にて検知された波長のそれぞれを示す光監視信号を前記波長多重信号に合波して出力する光監視制御部と、を有し、
前記伝送装置は、
前記複数の経路のそれぞれに対応して複数設けられ、当該対応する経路を伝送してきた波長多重信号から前記光監視信号を取得する取得部をさらに有し、
前記信号処理部は、前記取得部が取得した光監視信号にさらに基づいて、前記障害を検知する、請求項6に記載の伝送システム。 - 各中継用伝送装置は、
前記波長多重信号を前記波長多重信号に含まれる光波長信号のそれぞれに分波して出力する分離部と、
前記分離部から出力された各光波長信号に対して再生中継処理と、各光波長信号に基づいて当該中継用伝送装置が所属する経路で生じた障害を検知する検知処理とを行い、前記再生中継処理を行った光波長信号を出力する再生中継部と、
各再生中継部にて再生中継処理が行われた光波長信号を合波して出力する多重部と、を有し、
前記切替部にて選択されている経路に所属する中継用伝送装置の再生中継部は、前記障害を検知した場合、当該障害を示す警報信号を前記光波長信号として出力し、
前記光監視制御部は、前記切替部にて選択されている経路以外に所属する中継用伝送装置の再生中継部が前記障害を検知した場合、当該障害をさらに示す光監視信号を前記波長多重信号に合波して出力する、請求項7に記載の伝送システム。 - 複数の経路のそれぞれを伝送する、波長が異なる複数の光波長信号が合波された波長多重信号または当該波長多重信号に含まれる光波長信号の光レベルを検知し、
前記複数の経路のいずれかを選択し、当該選択した経路を伝送してきた波長多重信号または当該波長多重信号に含まれる光波長信号を光信号として出力し、
前記検知された光レベルと、前記出力された光信号に基づいて、各経路で発生した障害を検知し、当該検知結果に応じて、前記選択される経路を切り換える、経路切替方法。
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WO2005008924A1 (ja) * | 2003-07-18 | 2005-01-27 | Fujitsu Limited | 伝送ルート切替制御方法および光伝送装置 |
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