WO2006074614A1 - Procede et systeme d'auto-recuperation et procede de transfert d'information dans un environnement de protection partagee de canaux optiques - Google Patents

Procede et systeme d'auto-recuperation et procede de transfert d'information dans un environnement de protection partagee de canaux optiques Download PDF

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Publication number
WO2006074614A1
WO2006074614A1 PCT/CN2006/000060 CN2006000060W WO2006074614A1 WO 2006074614 A1 WO2006074614 A1 WO 2006074614A1 CN 2006000060 W CN2006000060 W CN 2006000060W WO 2006074614 A1 WO2006074614 A1 WO 2006074614A1
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WIPO (PCT)
Prior art keywords
source
sink node
channel
optical
message
Prior art date
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PCT/CN2006/000060
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English (en)
Chinese (zh)
Inventor
Congqi Li
Gang Nong
Da He
Yuzhi Jin
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Huawei Technologies Co., Ltd.
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Publication of WO2006074614A1 publication Critical patent/WO2006074614A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • 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
    • H04J14/0293—Optical channel protection
    • H04J14/0295—Shared protection at the optical channel (1:1, n:m)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Definitions

  • the present invention relates to the field of optical communications, and in particular, to a self-recovering method and system in optical channel sharing protection.
  • WDM Widelength Division Multiplexing
  • Optical communication technology is currently the fastest growing technology field, and WDM (Wavelength Division Multiplexing) technology is the technology of choice for high-speed and large-capacity transmission.
  • WDM technology refers to the technology of multiplexing multiple wavelengths on one fiber for transmission.
  • urban construction such as roads and pipeline construction often leads to sudden failures in the optical cable line, resulting in long-term loss of business, which brings great economic losses and pressure to operators.
  • protection and recovery methods are introduced in the WDM system.
  • OADM optical add/drop multiplexer
  • SDH Synchronous Digital Hierarchy
  • OUPSR unidirectional optical channel switching ring
  • OBPSR bidirectional optical channel switching ring
  • OULSR unidirectional optical line switching ring
  • OBLSR bidirectional optical line switching ring
  • OSNCP photon
  • OUPSR and OBPSR can improve network survival performance, but the wavelength utilization efficiency is relatively low.
  • OBLSR can improve the wavelength utilization efficiency appropriately, but because OBLSR adopts the loopback protection method, the path it takes is long, and the system OSNR (Optical Signal to Noise Ratio) budget needs to leave enough margin, which will be the system performance. Causes direct restrictions.
  • OULSR wavelength utilization is low, and OBLSR also requires sufficient system OSNR budget margin, which is not very suitable for WDM ring network applications.
  • OSNCP is often referred to as dual-shot selective protection or 1 + 10TU (wavelength conversion unit) protection in WDM ring networks.
  • This protection mode takes different paths because of the operating wavelength and backup wavelength, so its wavelength utilization efficiency is also comparable ⁇ ⁇ Hey.
  • Och-SPR that is, the optical channel shared protection ring.
  • the key feature of Och-.SPR is that a bidirectional connection service on the ring has a pair of different wavelengths. The wavelengths are the same route, different fibers and different directions. The same wavelength on the corresponding fiber is used as the working channel. Backup. Because this connection allows different cross-sections on the same ring to use the same pair of wavelengths to accomplish different two-way service connections, and the same pair of wavelengths that complete these different connections can use the same pair of backup wavelength channels as protection channels, so it is called Share protection for optical channels.
  • the optical channel shared protection allows the wavelengths in the same direction on the WDM ring to be reused, so that the wavelength utilization efficiency of the system can be improved, and the switching of the optical channel shared protection occurs directly between the transmitting end and the receiving end, and there is no path loopback. Therefore, the system only needs to follow the long path budget in the OSNR budget, which can avoid the system OSNR budget needs to leave too much margin, and greatly improve the networking capability of the system.
  • Patent Application No. 200410060103.3 "A Method, Apparatus and System for Controlling Optical Channel Sharing Protection” (given the optical channel sharing protection device shown in Figure 1, which does not require support similar to the APS control protocol) , can also achieve optical channel sharing protection.
  • the optical channel sharing protection device shown in Figure 1 has an automatic recovery function, and the corresponding workflow is shown in Figure 2. That is, the source and sink nodes always feed the signal light to the working channel and the backup channel, but the device has two possibilities in two cases to cause the optical channel sharing protection abnormality.
  • One is that the service connection in only one direction is affected by the fault.
  • the receiver can recognize the fault in the direction, but in the case of no protocol support (the part of the ID of the node is not detected in Figure 2), because the other direction If there is always light in the working channel, the peer node will never know its own state, and the optical channel sharing protection execution will be abnormal.
  • the other is that the services in both directions will fail at the same time. Obviously, both sides of the network can recognize the fault.
  • each node can be made to recognize its own state based on the detected service ID.
  • the receiving side in this direction will automatically resume the action because there is no signal in the working channel, but the actual In the other direction, there is no recovery. After the automatic recovery is completed, the fault will be caused because the other direction is still in the fault state, which will cause the protection oscillation.
  • the root cause of the above-mentioned fault protection switching and self-recovery problems is that only transmitting ID information without passing status information will result in failure to perform sufficient APS functions.
  • optical channel sharing protection method is also given in the patent application No. 200410060103.3, "A Method, Apparatus and System for Controlling Optical Channel Sharing Protection", which supports automatic recovery function, but only if there is a communication
  • the mechanism allows each node to determine the role of the node in the current protection switching.
  • the out-of-band mechanism is to transmit the APS message through the out-of-band monitoring channel.
  • the optical signal self-monitoring mechanism needs to report the fault and then transmit the APS message through the monitoring channel. Therefore, the response is slow, and
  • the monitoring channel itself also has the possibility of failure, and it also causes a malfunction when the monitoring channel fails.
  • the out-of-band method often introduces the APS protocol, which is complicated to implement and high in cost.
  • the in-band mode has two modes: in-band signaling and channel-to-path modulation signaling, but in the optical channel sharing protection, since the main optical signal is transparent to the intermediate node, the embedded signal is inserted in the optical signal overhead.
  • the in-band signaling cannot be captured by the intermediate node, so the in-band signaling mode is not applicable.
  • only the associated modulation signaling method remains.
  • the associated information of the optical channel sharing protection can be transmitted by the modulating signaling carried by the modulating method
  • the grading technique causes an OSNR loss on the main optical signal on the one hand, and an increase in cost on the other hand (additional additional modulation is required)
  • Devices and detection devices are also not very appropriate.
  • the optical channel shared protection method cannot achieve automatic recovery.
  • an object of the present invention is to provide a self-recovery method and system for optical channel sharing protection and a message transmission method, which can be implemented without increasing the complexity of the optical channel sharing protection device.
  • Optical channel sharing protection with self-recovery is to provide a self-recovery method and system for optical channel sharing protection and a message transmission method, which can be implemented without increasing the complexity of the optical channel sharing protection device.
  • the present invention provides a self-recovery method in optical channel sharing protection, including:
  • the source and sink nodes of the failed working channel pass different optical signal pulse sequences Interacting information to detect the status of the working channel;
  • the source and sink nodes corresponding to the channel will start the self-recovery process and restore the service from the backup channel to the working channel.
  • the method also includes the source and sink nodes of the failed working channel closing the working channel and periodically opening and closing the failed working channel.
  • the source and sink nodes exchange information through different optical signal pulse sequences during the periodic open period of the faulty working channel to detect the state of the working channel.
  • the sequence of optical signal pulses includes at least:
  • the status of the working channel is detected as follows:
  • the first source sink node sends a "Hello" message to the second source sink node
  • the second source and sink node After receiving the "Hello” message, the second source and sink node feeds back a "Hello Response” message to the first source and sink node.
  • the first source and sink node After receiving the "Hello Response” message, the first source and sink node sends a "WTR" message to the second source sink node, and the first source sink node and the second source sink node simultaneously enter the WTR state.
  • the first source sink node sends a "Hello" message to the second source sink node during the periodic open working channel;
  • the first source sink node enters a "Hello Response Waiting" state of the "Hello Response” message by the fault state entering the waiting for the second source sink node;
  • step B13 If the "Hello Response" message is not received by the second source and sink node within a predetermined time, the working channel of the first source and sink node returns to the fault state. Otherwise, step B3 is performed.
  • the second source sink node enters the "WTR" sent by the first source sink node by the fault state.
  • the WTR wait state of the message
  • the B3K first source sink node After receiving the "Hello Response" fed back by the second source sink node, the B3K first source sink node sends a "WTR" message to the second source sink node;
  • the first source sink node enters the WTR state, and the corresponding timer starts timing; and when the second source sink node receives the "WTR" message, it also enters the WTR state, and the corresponding timer starts timing;
  • the present invention further provides a method for switching an optical signal to transmit a message, including:
  • the transmitting node generates a regular sequence of optical signal pulses by regularly switching control or intensity control of the optical signal, and different optical signal pulse sequences represent messages of different contents; after receiving the different optical signal pulse sequences, the receiving node according to The content of its representation identifies the content of the received message.
  • the sequence of optical signal pulses may be a pulse sequence of a different number or a different time interval or a different pulse width.
  • the sequence of optical signal pulses can be generated by regularly switching the laser, or controlling the optical switch, or controlling the optically adjustable attenuator VOA.
  • the invention also provides an optical channel sharing protection system with self-recovery function, comprising: a channel switching device: configured to control a protection channel between a source and sink node and a working channel between the failed source according to the detection result information of the bidirectional detecting device Switching operation
  • Two-way detection device used to perform optical signal pulse sequence interaction between source and sink nodes, and determine the state of the working channel between the source and sink nodes according to the interaction situation.
  • the two-way detecting device further includes:
  • Detection information sending module used to send a sequence of optical signal pulses to the working channel through the optical fiber,
  • the optical signal transmitting portion and the optical signal switch may be composed of a source signal node, wherein the optical signal switch is used to generate a regular optical signal pulse sequence;
  • a detection information receiving module configured to receive, by using an optical fiber, a sequence of optical signal pulses transmitted from the detection information sending module, which may be an optical signal receiving portion of the source and sink nodes;
  • the detection information identification module is configured to detect the optical signal pulse sequence by detecting the optical power pulse sequence of the optical signal pulse sequence received by the detection information receiving module, and may be an optical power detecting device of the source and sink nodes.
  • the optical signal switch can be a light-on or adjustable attenuator.
  • the detection information receiving module and the detection information identification module may be connected to an optical add/drop multiplexing unit, wherein the optical add/drop multiplexing unit is configured to use the signals of the demultiplexed working channel and the backup channel. According to the network condition, it is transferred to the corresponding wavelength conversion unit, and at the same time, the optical signal sent by the wavelength conversion unit is transmitted to an appropriate direction to complete the service connection.
  • OUPSR, OBPSR, OULSR, OBLSR and other protection methods have shortcomings such as low wavelength utilization and large system optical signal-to-noise ratio budget margin. They also overcome the shortcomings of high complexity and low reliability of the monitoring channel carrying APS protocol. The instability of the existing optical channel sharing protection device is effectively solved, and the optical channel sharing protection without oscillation is self-recovery under the premise that the optical channel sharing protection device does not increase the complexity and does not require the monitoring channel support. Improve the survivability and reliability of WDM networks.
  • 1 is a schematic diagram of an existing optical channel sharing protection device
  • FIG. 3 is a state transition diagram of a working channel of a source and sink node in the method according to the present invention.
  • Figure 4 is a flow chart of the method of the present invention.
  • Figure 5 is a schematic structural view of a protection switching device in the system of the present invention.
  • Figure 6 is a schematic structural view of the system according to the present invention.
  • FIG. 7 is another schematic structural diagram of a protection switching device in the system of the present invention.
  • FIG. 8 is a schematic structural diagram of a source/sink node in the system of the present invention.
  • FIG. 9 is a schematic diagram of a system with an optical channel sharing protection self-recovery function according to the present invention.
  • the present invention provides a self-healing method and system in optical channel sharing protection.
  • the core of the invention is: when the working channel is in a fault state, the fault working channel is periodically opened between the source and sink nodes and the information is exchanged to detect the state of the working channel, and only after the working channel is completely restored, The fault recovery is performed on both ends of the fault source and sink.
  • the service is switched from the backup channel to the working channel to complete the self-recovery process.
  • the process of detecting whether the working channel is normal does not affect the normal protection switching of the working channel.
  • FIG. 3 is a state transition diagram of a source and sink node working channel in the method according to the present invention, which includes five states: a normal state, a fault state, a Hello response wait, a WTR wait state, and a WTR state.
  • the corresponding state migration process is as follows:
  • the source and sink nodes on both sides detect the fault immediately, perform protection switching immediately, switch the service from the working channel to the backup channel, enter the fault state at the same time, and start timing independently.
  • the source and sink nodes (named as the first source sink node) on the side immediately resume their working channel senders, and simultaneously pass through the working channel to the source and sink nodes on the opposite side (named as the second source).
  • the sink node sends a Hello message, and then immediately turns off the working channel sender again, and the first source sink node enters a Hello response waiting state.
  • the second source and sink node will receive a Hello message.
  • the WTR wait state is entered.
  • the second source sink node will also open its working channel transmitting side and send a Hello response message through the working channel.
  • the self-recovery operation can be performed. However, before the self-recovery operation is performed, in order to avoid unstable operation of the working channel, it is necessary to wait for the working channel to stabilize for a period of time before performing the recovery action. It is self-recovery waiting.
  • the first source and sink nodes immediately open the working channel (the working channel is no longer closed in the WTR state), and send a WTR message to the second source and sink node again, informing the opposite side to enter the WTR, and the first source and sink nodes enter the self-recovery, etc. Waiting for time. After receiving the WTR message, the second source and sink node also enters the WTR state according to FIG. 3.
  • the self-recovery action is performed when the time is full, the source and sink nodes return to the normal working state again, and the service is restored to the working channel again from the backup channel. If the working channel abnormality occurs again after the timing is not full, the first and second source and sink nodes will immediately return to the fault state and restart the new test.
  • the wait message is not received after the timer expires, it means that the working channel has not returned to normal, the status of the source and sink nodes will return to the fault state again, and wait or directly proceed. A round of testing.
  • FIG. 4 is a schematic flow chart of a method for implementing the optical channel sharing protection self-recovery of the present invention.
  • the transmission of the optical signal pulse sequence needs to be performed interactively between the first source sink node and the second source sink node; it should be noted that The side source sink node needs to execute the processing flow shown in FIG. 4 at the same time.
  • the processing provided in FIG. 4 will be described in detail below with reference to the meanings of the first source sink node and the second source sink node defined above. .
  • Step 41 When the source and sink nodes detect that the network is faulty, immediately shut down the working channel to notify the peer source and sink nodes that a network fault has occurred, thereby ensuring that the two source and sink nodes can perform protection switching work at the same time, and the service is from work.
  • the channel is switched to the backup channel, and the intermediate node detects the optical signal on the backup channel, and determines whether the current service is local through or local termination by ID detection or whether the working channel is normal, thereby completing the entire protection switching process. At this point, the working channel switches from the normal state to the fault state and starts timing.
  • Step 42 After the protection switching is completed, the source and sink nodes periodically open the working channel, and send a detection message to the opposite source and sink node to check whether the working channel is normal. That is, after the source and sink nodes meet the predetermined time period, the source and sink nodes (named as the first source sink node) open the optical port of the working channel to the opposite source and sink node (named the second source sink node). Send "Hello"
  • Step 43 After the first source sink node sends a "Hello” message to the second source sink node, it enters a state of waiting for the "Hello Response” message fed back by the second source sink node, if a "Hello response" is received within a predetermined time. " message, go to step 44; otherwise, after the predetermined time The channel returns to the working channel fault state of step 41;
  • Step 47 The second source and sink node receives the "Hello" message sent by the first source and sink node, and performs step 48;
  • Step 48 The second source and sink node feeds back a "Hello Response” message, that is, a "Hello Response” message, to the first source sink node through its sending side;
  • Step 49 After the second source sink node sends a feedback message to the first source sink node, it enters a state of waiting for the first source sink node to send a "WTR" message thereto.
  • Step 44 After receiving the "Hello Response" message fed back by the second source sink node, the first source sink node determines that the working channel has returned to normal, and then the first source sink node sends a "WTR" message to the second source sink node. At the same time, it enters the WTR state and starts self-recovery timing. The second source and sink nodes will also enter the WTR state after receiving the "WTR" message. By default, the first source sink node and the second source sink node simultaneously enter the WTR (self-recovery wait In the state of the state (assuming that the messaging delay is not considered);
  • the second source sink node receives the "WTR" message within a predetermined time, and then performs the step.
  • Step 410 After the second source and sink node receives the "WTR" message, the timer starts and the second source and sink node enters the WTR state.
  • Step 411 If the second source and sink node does not reoccur in the working channel during the self-recovery waiting time, after the timer expires, step 46 is performed; otherwise, the timer expires, and the optical channel returns to the working channel of step 41. Fault status.
  • Step 45 Similarly, the first and second source and sink nodes have no abnormality in the working channel during the self-recovery waiting time, and after the timer expires, step 46 is performed; otherwise, the timer expires, and the optical channel is back. Go to step 41 for the working channel fault condition.
  • Step 46 The self-recovery process is started immediately after any one of the first and second source and sink nodes is full, and the backup channel is closed, and the service is restored from the backup channel to the working channel. At this time, even another source and sink node The counter is not full, but the recovery process of switching the service from the backup channel to the working channel is performed because there is no signal on the backup channel.
  • the present invention Take the following method:
  • An optical switch or VOA light adjustable attenuator
  • VOA light adjustable attenuator
  • the optical power detection is performed on the opposite source and sink node, and the corresponding message signal is extracted by the detected change of the light intensity, so that the “state detection” message is transmitted to the opposite source and sink node. Since the service is transmitted through the backup channel at this time, and the working channel does not carry the service, the message transmission process does not affect the normal transmission of the service signal.
  • the actual transmitted optical power will be reduced (the transmission power will be reduced below the specified power threshold according to different security levels), The rate at which such an optical signal is turned on and off is not so high, so reducing the transmission power does not affect the transmission of the actual message.
  • the present invention provides a system for optical channel sharing protection self-recovery, and a schematic diagram of a source-sink node in the system is shown in FIG. 5.
  • the structure of the system is shown in Figure 6, which mainly includes:
  • Channel switching device configured to control a switching operation between a protection channel and a working channel between the source and sink nodes that have failed according to the detection result information of the bidirectional detecting device;
  • the two-way detecting device performs the interaction of the optical signal pulse sequence between the source and sink nodes, and determines the state of the working channel between the source and sink nodes according to the interaction condition as the detection result information.
  • the two-way detecting device further includes:
  • the detecting information sending module is configured to: send an optical signal pulse sequence to the working channel through the optical fiber, and the optical signal transmitting portion of the source and sink nodes and the optical switch 4, wherein the optical switch 4 is configured to generate a regular optical signal pulse sequence;
  • a detection information receiving module configured to receive, by using an optical fiber, a sequence of optical signal pulses transmitted from the detection information transmitting module, and is composed of an optical signal receiving portion of the source and sink nodes;
  • the detection information identification module is configured to detect the optical power pulse sequence of the optical signal pulse sequence received by the detection information receiving module, and identify the optical signal pulse sequence, and is composed of an optical power detecting device of the source and sink nodes.
  • the specific work process of the system includes:
  • the first source and sink node After receiving the fault on the east receiving side, the first source and sink node turns off the switch 4, The action is performed on whether the east-facing transmitting side is affected, so that the source-sink node sends and receives the fault in the east direction, so as to notify the west source and the neighboring node that a network fault occurs in the west direction.
  • the source-sink node (second source sink node) on the opposite side of the first source-sink node also recognizes the fiber fault through its receiving side, and the first source-sink node and the second source-sink node simultaneously perform optical channel sharing protection. Switchover, switching the service from the working channel to the backup channel.
  • the system enters the periodic detection state of the working channel.
  • the first source and sink nodes perform a series of regular switches on the switch 4, from the east W fiber to the second.
  • the source and sink nodes emit a sequence of light pulses (representing a "Hello" message).
  • the sequence of the switch 4 has a regular switch, which can be set to: 1 second off for 1 second, 3 times for "Hello” message; 1 second for 2 seconds, 3 times for "Hello Response” ; and open 2 seconds off 1 second, repeat 3 times to represent the "WTR" message.
  • the optical power detecting device of the West W fiber of the second source and sink node After detecting the pulse, the optical power detecting device of the West W fiber of the second source and sink node immediately sends a set of response pulse sequences (representing "Hello Response” message) through its west W fiber.
  • the first source and sink node will receive the "received state detection” message, and then immediately send a "WTR” message to the second source sink node, and start the timer at the same time. Start timing, enter to wait for the recovery timing state.
  • the second source and sink node After receiving the "WTR" message, the second source and sink node starts the timer immediately and starts to wait for the recovery timing state.
  • the first and second source and sink nodes always open their working channels while waiting for the recovery timing state. If one of the nodes suddenly fails again during the waiting for recovery, the system enters the working channel periodic detection state again. Obviously, because the working channel is closed, the opposite source and sink nodes will also detect that the working state is abnormal, so it will also end the waiting for recovery state.
  • the source and sink nodes that have reached the timeout start the self-recovery process to close the backup channel and select the service from the working channel. Even if the counter does not time out, the opposite source does not time out. No signal from the backup channel also performs a recovery process from the backup channel to the working channel.
  • the implementation given by the present invention is not limited to being implemented by an optical switch, but can also be implemented by an adjustable attenuator.
  • the present invention also provides another optical channel shared protection self-recovery system, and the structure diagram of the source and sink nodes in the system is as shown in FIG. Replaced with VOA (adjustable attenuator) compared to Figure 5.
  • the optical switch 4 can simulate the same effect as the optical switch 4 by periodically setting the attenuation amount of the VOA, and can also map the above three kinds of messages into optical power variations on the working channel.
  • the message implementation manner of the present invention is not limited to the two modes of the optical switch and the adjustable attenuator, and can also be implemented by a faster pulse sequence, but the specific implementation is limited by the switching frequency of the optical switch and the response frequency of the PIN tube. Of course, there is a sampling circuit after the PIN tube, and the sampling frequency of the sampling circuit also limits the frequency of the pulse sequence.
  • the present invention also provides a system with optical channel sharing protection self-recovery function, the structure of the source and sink nodes in the system is shown in Figure 8, specifically the above system and OADM (light division)
  • the plug-in multiplexing unit is connected together to realize automatic recovery of the system.
  • the structure of the system is shown in Figure 9, which mainly includes:
  • Channel switching device configured to control a switching operation between a protection channel and a working channel between the source and sink nodes that have failed according to the detection result information of the Han direction detecting device;
  • the two-way detecting device performs the interaction of the optical signal pulse sequence between the source and sink nodes, and determines the state of the working channel between the source and sink nodes according to the interaction condition as the detection result information.
  • the two-way detecting device further includes:
  • a detection information sending module connected to the optical add/drop multiplexing unit: configured to send an optical signal pulse sequence to the working channel through the optical fiber, and is composed of an optical signal transmitting portion of the source and sink nodes and an optical switch, wherein the optical signal switch is used to generate regular light Signal pulse sequence;
  • a detection information receiving module connected to the optical add/drop multiplexing unit: configured to receive, by the optical fiber, an optical signal pulse sequence transmitted from the detection information sending module, and is composed of an optical signal receiving portion of the source and sink nodes;
  • the detection information identification module is configured to detect the optical power pulse sequence of the optical signal pulse sequence received by the detection information receiving module, and identify the optical signal pulse sequence, and is composed of an optical power detecting device of the source and sink nodes.
  • the optical add/drop multiplexing unit may transfer the demultiplexed working channel and the backup channel signal to the corresponding wavelength conversion unit according to the network condition, and simultaneously transmit the optical signal sent by the wavelength conversion unit to an appropriate direction. Complete the business connection.

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Abstract

L'invention concerne un procédé et un système d'auto-récupération dans un environnement de protection partagée de canaux optiques. Ce procédé comprend les étapes suivantes: le service est commuté sur le canal auxiliaire par le canal de travail défaillant; le noeud source du canal de travail défaillant élargit la périodicité du canal de travail et échange un message pour détecter l'état dudit canal de travail; après détection de l'état normal du canal de travail, le noeud source du canal débute le traitement d'auto-récupération, récupère le service dans le canal auxiliaire et le transfère vers le canal de travail. Selon l'invention, il est possible de réaliser une auto-récupération dans un environnement de protection partagée de canaux optiques et d'améliorer la viabilité et la sécurité d'un réseau à multiplexage par répartition en longueur d'onde.
PCT/CN2006/000060 2005-01-14 2006-01-13 Procede et systeme d'auto-recuperation et procede de transfert d'information dans un environnement de protection partagee de canaux optiques WO2006074614A1 (fr)

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CNB2005100021511A CN100454879C (zh) 2005-01-14 2005-01-14 光通道共享保护中的自恢复方法及系统
CN200510002151.1 2005-01-14

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