WO2006035481A1 - 光波長分岐挿入装置および障害回復方法 - Google Patents
光波長分岐挿入装置および障害回復方法 Download PDFInfo
- Publication number
- WO2006035481A1 WO2006035481A1 PCT/JP2004/014077 JP2004014077W WO2006035481A1 WO 2006035481 A1 WO2006035481 A1 WO 2006035481A1 JP 2004014077 W JP2004014077 W JP 2004014077W WO 2006035481 A1 WO2006035481 A1 WO 2006035481A1
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- Prior art keywords
- ring transmission
- optical
- reception
- threshold
- transmission line
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Classifications
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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
Definitions
- the present invention relates to an optical wavelength add / drop device and a failure recovery method arranged at a node position of an optical ring network.
- An optical wavelength add / drop device is used as a node device that branches, inserts, and passes an optical signal of one wavelength or more according to the wavelength at a node position in various optical communication networks.
- a ring network using such an optical wavelength add / drop device when performing transmission line redundancy, a ring transmission path for the active system and a standby system whose transmission directions are opposite to each other is formed, and each node ( In the optical wavelength add / drop device), the output of the optical transmitter is transmitted to both the active system and the standby system using the optical branching means, and for the optical receiver, it is branched from each of the active system and the standby system.
- the optical signal is connected via a switch or selector, and the switch of the transmission path is switched according to the switching of the working Z spare, so that the path of the received optical signal is selected! Four).
- Patent Document 4 discloses a technique for absorbing the level fluctuation of the received optical signal that occurs when the active system Z standby system is switched. The outline will be described below with reference to FIG.
- FIG. 6 is a block diagram showing a configuration example of an optical transceiver in a conventional optical wavelength add / drop multiplexer.
- the optical signal output from the optical transmitter (Tx) 60 is branched into two by the optical branching means 61.
- One branch optical signal is sent to the active ring transmission line after the send level is adjusted by the variable level adjusting unit 62a.
- the other split optical signal is sent to the standby ring transmission line after the send level is adjusted by the variable level adjuster 62b.
- optical signals are respectively input to the path switching unit (SW) 63 from the active ring transmission path and the standby ring transmission path.
- the path switching unit (SW) 63 selects an optical signal from one of the ring transmission paths according to a path switching signal input from the outside.
- the reception level of the optical signal selected by the path switching unit (SW) 63 is adjusted by the variable level adjustment unit 64 and input to the optical receiver (Rx) 65.
- the transmitting side adjusts the level of the optical signal sent to the active and standby ring transmission lines
- the receiving side adjusts the level of the received optical signal selected by the path switching unit. Since it is adjusted and input to the optical receiver, it is possible to absorb the fluctuations in the level of the received optical signal that occurs when the active Z spare system is switched.
- Patent Document 1 Japanese Patent Laid-Open No. 5-336139
- Patent Document 2 JP-A-10-126350
- Patent Document 3 Japanese Patent Laid-Open No. 11 55700
- Patent Document 4 Japanese Patent Laid-Open No. 2002-271268
- the present invention has been made in view of the above, and in a ring network having an active system and a standby system redundant transmission path, high-speed switching of a transmission path due to a transmission path failure or the like can be realized, and the transmission path It is an object of the present invention to obtain an optical wavelength add / drop device and a failure recovery method that can always obtain the best reception characteristics without being affected by switching of the optical wavelength.
- the present invention is arranged at each node position in a ring network composed of first and second ring transmission lines in which the transmission directions of optical signals are opposite to each other.
- the optical receiver for receiving the optical signal from the ring transmission path selected according to the path switching signal among the first and second ring transmission paths is connected to the selected ring transmission path. It is characterized by having threshold setting means for setting an optimal reception threshold.
- the optical receiver when switching between the first and second ring transmission lines occurs due to a transmission line failure or the like, the optical receiver is set with an optimal reception threshold value in the transmission path of the switching destination. Therefore, the best reception characteristic can be obtained with the force immediately after switching. Therefore, the transmission line can be switched at a high speed due to a transmission line failure or the like.
- FIG. 1 is a block diagram showing a configuration of an optical wavelength add / drop multiplexer according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart showing an example of an operation for setting and saving threshold data for giving an optimum reception threshold to the threshold switching function unit shown in FIG.
- FIG. 3 is a block diagram showing a configuration of an optical wavelength add / drop multiplexer according to Embodiment 2 of the present invention.
- FIG. 4 is a system diagram for explaining a ring network in a normal state as Embodiment 3 of the present invention.
- FIG. 5 is a system diagram for explaining a ring network at the time of a transmission line failure, as Embodiment 3 of the present invention.
- FIG. 6 is a block diagram showing a configuration example of an optical transceiver in a conventional optical wavelength add / drop multiplexer.
- FIG. 1 is a block diagram showing the configuration of an optical wavelength add / drop multiplexer according to Embodiment 1 of the present invention.
- the optical wavelength add / drop device 1 shown in FIG. 1 includes a supervisory control unit 2 that controls the entire device, and an optical transceiver 3 that operates under the control of the supervisory control unit 2, and the transmission directions are opposite to each other. It is placed at each node position in a ring network with a redundant transmission line for both active and standby systems.
- the optical transceiver 3 is an optical transmitter (Tx) 10 and an optical branching means (CPL) for sending the output of the optical transmitter ( ⁇ ⁇ ⁇ ) 10 to each ring transmission path of the active system and the standby system as the transmitting side.
- Tx optical transmitter
- CPL optical branching means
- the optical transceiver 3 is selected as a receiving side by the path switching unit (SW) 12 and the path switching unit (SW) 12 for inputting optical signals from the ring transmission paths of the active system and the standby system, respectively.
- An optical receiver (Rx) 13 that receives the optical signal of the ring transmission path force, and a threshold value switching function unit 14 that forms part of the data identification circuit in the optical receiver (Rx) 13. Yes.
- the optical transceiver 3 is provided with an interface unit (IZ F) 15 that exchanges signals with the monitoring control unit 2.
- the interface unit (IZF) 15 is assumed to be interposed between the above-described elements on the receiving side of the optical transceiver 3 and the monitoring control unit 2.
- FIG. 1 shows a 2-input 1-output optical switch assuming a simple configuration for capturing an optical signal of one wavelength.
- any optical component having a selector function that has a large number of input / output ports and can be connected to any one output port for a plurality of input ports can be used. In this case, there are as many optical receivers as the number of output ports.
- the received signal quality information that the optical receiver (Rx) 13 provides to the supervisory control unit 2 via the interface unit (IZF) 15 includes, for example, optical reception such as input power of the optical signal and errors after identification. Various information on the quality of the received optical signal obtained by the device (Rx) 13 and the presence or absence of input are included.
- the supervisory control unit 2 issues a path switching signal using this received signal quality information.
- the threshold value switching function unit 14 is a threshold data holding unit (hereinafter referred to as "memorandum"). 16) and a threshold value switching unit 17.
- the memory 16 has a working storage area 16a for storing threshold data Vth-0 for the working transmission line that gives the optimum receiving threshold in the working transmission line, and a spare that gives the optimum receiving threshold in the standby transmission line.
- a standby storage area 16b for storing threshold data Vth-1 for the transmission line is provided.
- the threshold data is set in the active storage area 16a and the standby storage area 16b by the monitoring controller 2 as an initial setting during system operation, for example, according to the procedure shown in FIG.
- the threshold switching unit 17 includes, for example, a switch with two inputs and one output, and one of the two inputs is threshold data Vth-0 stored in the active storage area 16a, and the other is the standby storage area 16b. Threshold data Vth—1 stored in, and one of the two inputs is selected according to the path switching signal input from the supervisory control unit 2 via the interface unit (IZF) 15, and the optical receiver ( Rx) 13 to give.
- IZF interface unit
- Rx optical receiver
- the monitoring control unit 2 of each optical wavelength add / drop multiplexer on the ring network uses the working transmission line for the receiving side of the optical transceiver 3 of the optical wavelength branching adder.
- a path switching signal is issued to indicate Therefore, on the receiving side of the optical transmitter / receiver 3 of the optical wavelength add / drop device, the path switching unit 12 selects the optical signal from the working transmission line and provides it to the optical receiver (Rx) 13.
- the threshold value switching unit 17 gives and sets the working system threshold data Vth-0 to the optical receiver (Rx) 13.
- the supervisory control unit 2 of each optical wavelength add / drop device transmits and receives optical signals using the active ring transmission line, and the optical receiver (Rx) 13 receives the optimum reception threshold in the active transmission line.
- the soundness of the upstream active transmission line is monitored based on the received signal quality information input from the optical receiver (Rx) 13.
- the supervisory control unit 2 of a certain optical wavelength add / drop device when an upstream transmission line failure is detected due to the extremely weak power of the optical signal taken from the active transmission line, When a failure of the upstream optical wavelength add / drop device is detected due to a rapid increase in the error rate of the captured optical signal, the supervisory control unit 2 is able to transmit normal data over the active transmission line.
- Receiving side of optical transceiver 3 The content of the path switch signal issued to the switch is switched from the use instruction for the working transmission line to the use instruction for the standby transmission line.
- the path switching unit 12 selects the optical signal of the backup transmission path power and sends it to the optical receiver (Rx) 13. give.
- the threshold value switching unit 17 sets the standby system threshold data Vth-1 to the optical receiver (Rx) 13.
- the optical receiver (Rx) 13 starts the reception operation with threshold data Vth-1 that gives the optimum reception threshold V to the standby transmission line.
- the path switching and the threshold setting of the optical receiver are performed. Since the time required is largely dependent only on the switching speeds of the route switching unit 12 and the threshold switching unit 17, high-speed route switching can be achieved. In addition, the best reception characteristics can be obtained immediately after switching.
- FIG. 2 As an example of the threshold setting procedure, when a ring network using a predetermined number of optical wavelength add / drop multiplexers is started, or after that, an optical wavelength add / drop multiplexer is newly installed or an optical transceiver is connected to the optical wavelength add / drop multiplexer.
- An example of an operation for setting and saving threshold data that gives an optimum reception threshold value to the threshold switching function unit 14 when they are first started is shown in a flowchart form.
- the supervisory control unit 2 gives an instruction to select the working path at the start of operation or operation to the reception side of the optical transceiver 3 (step ST1).
- the supervisory control unit 2 performs an optimum threshold value search on the working transmission line based on the received signal quality information of the optical receiver (Rx) power, and when finished, switches the threshold data Vth-0 for the working system that has been found to the threshold value.
- the supervisory control unit 2 gives an instruction to select a backup path to the reception side of the optical transceiver 3 (step ST3).
- the supervisory control unit 2 performs the optimum threshold search in the standby transmission line in the same manner as the active system, and stores the threshold data Vth-1 for the standby system that has been searched for by the threshold setting signal that is supplied to the threshold switching function unit 14.
- Step ST4 o
- the supervisory control unit 2 gives an instruction to select the working system to the receiving side of the optical transceiver 3 when the search for the optimum threshold is completed for the transmission paths of the working system and the standby system as described above. .
- the threshold value switching function unit 14 since the threshold value switching function unit 14 has finished setting the threshold data, the threshold data Vth-0 for the active system is set in the optical receiver (Rx) 13 in response to the instruction to select the active system. (Step ST5). As a result, the normal operation state is obtained (step ST6).
- automatic threshold adjustment may be performed with the optimum threshold set at the start of operation of the optical transceiver as an initial value.
- threshold value automatic adjustment for example, threshold adjustment that minimizes the error rate used at the start of operation may be performed.
- control is performed such that the threshold value is finely adjusted in the direction in which the error rate decreases while slightly changing the threshold value.
- automatic threshold adjustment can be started with a threshold value that has been roughly optimized in advance as an initial value, even if the threshold value is changed, reception characteristics do not deteriorate excessively, and near the optimal point. Since search and control are performed, adjustment time can be shortened.
- the optimal reception threshold value corresponding to the change in the optical waveform before and after the switching can be set in conjunction with the path switching.
- the optimal reception threshold is set for both the primary and standby systems, and the optimal threshold for each transmission path is set in the optical receiver when switching between the active system and the standby system. Reception characteristics can be obtained, and reception characteristics can be improved. As a result, the transmission distance can be increased and a multi-node optical wavelength add / drop device connected to a ring network, which is an optical communication transmission network, can be realized.
- FIG. 3 is a block diagram showing a configuration of an optical wavelength add / drop multiplexer according to Embodiment 2 of the present invention.
- components that are the same as or similar to the components shown in FIG. 1 (Embodiment 1) are assigned the same reference numerals.
- the description will focus on the part related to the second embodiment.
- the optical wavelength add / drop device 20 includes a supervisory control unit 21 and an optical transceiver 22.
- a path switching unit (SW) 23 is provided instead of the path switching unit (SW) 12, and an optical signal monitor (Mon) 24 is added!
- the path switching unit (SW) 23 is, for example, a 2-input 2-output optical switch.
- SW When the first input port is connected to the first output port, the second input port is connected to the second output port. .
- the second input port When the first input port is connected to the second output port, the second input port operates to be connected to the first output port.
- the output port to which the input port to which the optical signal from the working transmission line is applied is connected is connected to the input terminal of the optical receiver (Rx) 13, and the standby transmission line power is reduced.
- the output port to which the input port to which the optical signal is applied is connected is connected to the input terminal of the optical monitor (Mon) 24.
- the optical monitor (Mon) 24 receives an optical signal having a transmission path force not selected.
- the optical monitor (Mon) 24 has one or both of a function of detecting an optical signal input interruption and a function of detecting signal quality degradation, and monitors the optical signal from the transmission line when selected.
- the monitor information which is the monitor result, is output to the monitor control unit 21.
- the active transmission line is selected and the standby transmission line is not selected.
- the optical monitor (Mon) 24 monitors the optical signal having the standby transmission line power and outputs the standby system signal monitor information to the monitoring control unit 21.
- the supervisory control unit 21 is currently selected based on the monitor information from the optical monitor (Mon) 24.
- the optical signal status of the standby system (for example, when the data transmission is performed in the active system) is constantly monitored and selected. If an abnormality occurs in the path, the current path that is the reverse path is selected.
- the function to transfer the abnormal alarm to the opposite station using the route, the function to correct the currently selected V, and the optimum threshold for the route are added! RU
- the optical signal state of the route that is currently selected is constantly monitored, when an abnormality occurs in the unselected route, the reverse route is obtained. It is possible to take measures to forward an abnormal alarm to the opposite station using the currently selected route, and to improve the reliability of the ring network.
- FIG. 4 and FIG. 5 are system diagrams for explaining the ring network at the normal time and at the time of transmission line failure as the third embodiment of the present invention.
- a failure recovery method in a ring network will be described.
- the ring network to which the present invention is applied is composed of an active transmission line 40a and a standby transmission line 40b that transmit optical signals in opposite directions.
- the transmission direction in the active transmission line 40a is clockwise
- the transmission direction in the standby transmission line 40b is counterclockwise.
- the optical add / drop device constituting the node of the ring network is the optical add / drop device 1 shown in FIG. 1 (Embodiment 1) or the optical add / drop device shown in FIG. 3 (Embodiment 2).
- the device 20 is shown in FIG. 4 and FIG. 5 as representative examples of the optical add / drop device 30a of node-i and the optical add / drop device 30b of node-j.
- the optical transceiver 3 shown in FIG. 1 (Embodiment 1) is shown as the optical transceiver of the optical add / drop device 30a.
- FIG. 1 Embodiment 1
- the output optical signal of the optical transmitter (Tx) 10 is transmitted to the active transmission line 40a and the standby transmission line 40b by the optical branching means (CPL) 11. To be sent.
- This transmitted optical signal is transmitted in the clockwise direction on the working transmission line 40a. If the path is healthy, it is received by the optical add / drop device 30b of node-j and the optical add / drop device 3 Oa of node-i. The Further, this transmission optical signal is transmitted in the counterclockwise direction in the standby transmission line 40b. If the path is healthy, the optical add / drop device 30b of node-j and the optical add / drop device 30a of node-i Received.
- the path switching unit 12 on the receiving side of the optical transceiver receives the optical signals in both transmission path forces in this way, but selects the active transmission path 40a. Therefore, the optical signal from the working transmission line 40a is input to the optical receiver (Rx) 13.
- each of the active transmission line 40a and the standby transmission line 40b is optimized. Since an appropriate reception threshold is set, the optical receiver (Rx) 13 sets the optimum reception threshold for the active system by the threshold switching function unit 14, and performs reception processing with the best reception characteristics.
- the transmission path is switched by monitoring the input light level. It may be switched by an instruction from the monitoring control apparatus for the entire system.
- the optical add / drop device according to the present invention is useful for constructing a ring network having a redundant configuration, and in particular, a ring network that requires high-speed switching of transmission lines.
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JP2006537575A JP4545756B2 (ja) | 2004-09-27 | 2004-09-27 | 光波長分岐挿入装置および障害回復方法 |
PCT/JP2004/014077 WO2006035481A1 (ja) | 2004-09-27 | 2004-09-27 | 光波長分岐挿入装置および障害回復方法 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009253391A (ja) * | 2008-04-01 | 2009-10-29 | Mitsubishi Electric Corp | 光パス切替え装置 |
JP2012222555A (ja) * | 2011-04-07 | 2012-11-12 | Mitsubishi Electric Corp | 光伝送装置 |
US9287970B2 (en) | 2012-05-01 | 2016-03-15 | Fujitsu Limited | Optical transmission device and optical transmission method |
CN110581731A (zh) * | 2018-06-11 | 2019-12-17 | 台达电子工业股份有限公司 | 智能定义光隧道网络***与网络***控制方法 |
US10911843B2 (en) | 2018-06-11 | 2021-02-02 | Delta Electronics, Inc. | Intelligence-defined optical tunnel network system and network system control method |
US10931393B2 (en) | 2018-06-11 | 2021-02-23 | Delta Electronics, Inc. | Intelligence-defined optical tunnel network system and network system control method |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55123248A (en) * | 1979-03-15 | 1980-09-22 | Nec Corp | Light loop data transmission system |
JPS57121354A (en) * | 1981-01-20 | 1982-07-28 | Toshiba Corp | Optical receiving circuit |
JPS6266733A (ja) * | 1985-09-18 | 1987-03-26 | Fujitsu Ltd | 光端局二重化システム |
JPH0677977A (ja) * | 1992-08-25 | 1994-03-18 | Fujitsu Ltd | リング型光伝送システム |
JP2000341344A (ja) * | 1999-05-25 | 2000-12-08 | Kdd Kaitei Cable System Kk | 光受信装置及び方法並びに光伝送システム |
JP2000358015A (ja) * | 1999-06-14 | 2000-12-26 | Toshiba Corp | デジタル信号品質モニタ方法とこの方法を用いた通信装置 |
JP2001021929A (ja) * | 1999-07-12 | 2001-01-26 | Furukawa Electric Co Ltd:The | 光線路切り替えシステム |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03112235A (ja) * | 1989-09-26 | 1991-05-13 | Nec Corp | 光ループ式伝送路のループバック方式 |
JP3976771B2 (ja) * | 2003-07-18 | 2007-09-19 | 富士通株式会社 | 伝送ルート切替制御方法および光伝送装置 |
-
2004
- 2004-09-27 WO PCT/JP2004/014077 patent/WO2006035481A1/ja active Application Filing
- 2004-09-27 JP JP2006537575A patent/JP4545756B2/ja not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55123248A (en) * | 1979-03-15 | 1980-09-22 | Nec Corp | Light loop data transmission system |
JPS57121354A (en) * | 1981-01-20 | 1982-07-28 | Toshiba Corp | Optical receiving circuit |
JPS6266733A (ja) * | 1985-09-18 | 1987-03-26 | Fujitsu Ltd | 光端局二重化システム |
JPH0677977A (ja) * | 1992-08-25 | 1994-03-18 | Fujitsu Ltd | リング型光伝送システム |
JP2000341344A (ja) * | 1999-05-25 | 2000-12-08 | Kdd Kaitei Cable System Kk | 光受信装置及び方法並びに光伝送システム |
JP2000358015A (ja) * | 1999-06-14 | 2000-12-26 | Toshiba Corp | デジタル信号品質モニタ方法とこの方法を用いた通信装置 |
JP2001021929A (ja) * | 1999-07-12 | 2001-01-26 | Furukawa Electric Co Ltd:The | 光線路切り替えシステム |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009253391A (ja) * | 2008-04-01 | 2009-10-29 | Mitsubishi Electric Corp | 光パス切替え装置 |
JP2012222555A (ja) * | 2011-04-07 | 2012-11-12 | Mitsubishi Electric Corp | 光伝送装置 |
US9287970B2 (en) | 2012-05-01 | 2016-03-15 | Fujitsu Limited | Optical transmission device and optical transmission method |
CN110581731A (zh) * | 2018-06-11 | 2019-12-17 | 台达电子工业股份有限公司 | 智能定义光隧道网络***与网络***控制方法 |
EP3582508A1 (en) * | 2018-06-11 | 2019-12-18 | Delta Electronics, Inc. | Intelligence-defined optical tunnel network system and network system control method |
JP2019216419A (ja) * | 2018-06-11 | 2019-12-19 | 台達電子工業股▲ふん▼有限公司Delta Electronics,Inc. | 知恵定義光トンネルネットワークシステムとネットワークシステム制御方法 |
US10911843B2 (en) | 2018-06-11 | 2021-02-02 | Delta Electronics, Inc. | Intelligence-defined optical tunnel network system and network system control method |
US10931393B2 (en) | 2018-06-11 | 2021-02-23 | Delta Electronics, Inc. | Intelligence-defined optical tunnel network system and network system control method |
CN110581731B (zh) * | 2018-06-11 | 2022-03-11 | 台达电子工业股份有限公司 | 智能定义光隧道网络***与网络***控制方法 |
JP7099667B2 (ja) | 2018-06-11 | 2022-07-12 | 台達電子工業股▲ふん▼有限公司 | 知恵定義光トンネルネットワークシステムとネットワークシステム制御方法 |
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JP4545756B2 (ja) | 2010-09-15 |
JPWO2006035481A1 (ja) | 2008-05-15 |
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