CN101145879A - A device and method for realizing section protection in single fiber bidirectional WDM system - Google Patents
A device and method for realizing section protection in single fiber bidirectional WDM system Download PDFInfo
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- CN101145879A CN101145879A CNA2007101265141A CN200710126514A CN101145879A CN 101145879 A CN101145879 A CN 101145879A CN A2007101265141 A CNA2007101265141 A CN A2007101265141A CN 200710126514 A CN200710126514 A CN 200710126514A CN 101145879 A CN101145879 A CN 101145879A
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Abstract
The invention relates to a device for realizing the multiplex section protection of a single fiber bi-directional WDM system, which comprises a management control unit composed of a monitor and a controller, wherein the monitor is located at the receiving end of A-directional wavelength in a channel layer. The method that uses the device to realize the multiplex section protection includes that the monitor detects the signal quality of multiple wavelengths and submits the results to a controller; the controller analyzes the data submitted by the monitor and sends down the protection switch command to a selector. The device and the method can overcome the technical problem that when the fiber in the working channel breaks, the monitor at the optical switch can still detect the reflection of the back light (a light splitter in the direction of the optical switch) so that the optical switch can not be successfully switched; the invention realizes the multiplex section protection switch of the single fiber bi-directional WDM system and ensures the reliable transmission of the WDM system.
Description
Technical field:
The present invention relates to single fiber bidirectional WDM (the Wavelength DivisionMultiplexing of optical communication field; wavelength-division multiplex technique) system transmissions equipment and method; particularly a kind of single fiber bidirectional WDM system realizes the apparatus and method of multiplex section protection, helps realizing the reliable transmission of single fiber bidirectional WDM system.
Background technology:
Wdm system mainly contains two fine transmitted in both directions and two kinds of structures of single fiber bi-directional transmission and method at present.Wherein, the wavelength of both direction is different in the single fiber bidirectional WDM system, during the system design wavelength, can select a direction to use red tape light, and another direction is used blue zone light; Also can select a direction to use the C bandgap wavelength, another direction is used the C+ bandgap wavelength, forms the wavelength form that interweaves.The present invention arrange a direction be designated as A to, another direction be designated as B to; A to wavelength be a1, and a2 ... }, B to wavelength be b1, b2 ... .}.
The protection of protection subchannel and the multiplex section protection of wdm system.Multiplex section 1+1 protected principle can be advised G.808.1 (12/2003) " Generic protection switching-Linear trail andsubnetwork protection " with reference to ITU-T; normally at transmitting terminal (source end; source end) adopts permanent bridge joint device (Permanent bridge); utilize selectivity selector (Selectiveselector) to select according to qualifications at receiving terminal (Su Duan, sink end) according to signal quality.Fig. 1 is the theory diagram that existing two fine two-way (being that single fiber is unidirectional) system realizes multiplex section protection.As shown in the figure: this system adopts concurrent excellent debit's formula, adopts 50: 50 optical splitters as permanent bridge joint device at transmitting terminal, utilizes optical switch to select according to qualifications with the quality according to system's optical fiber link as selector at receiving terminal.Monitor is the optical power monitor that is connected in multiplex section optical switch branch road place, and controller is a management control unit, and controller can be according to the quality testing situation of monitor to system's optical fiber link, and the control selector carries out the protection of multiplex section and switches.
But the single fiber bi-directional system can't adopt said structure and method to realize multiplex section protection exchanging.Reason is in the single fiber bi-directional system to have in the optical fiber light signal of both direction, when the optical fiber of service aisle disconnects, the monitor at optical switch place still may detect the reverberation of backlight (optical switch is to optical splitter), causes optical switch successfully to switch.
Summary of the invention:
The object of the present invention is to provide a kind of single fiber bidirectional WDM system to realize the apparatus and method of multiplex section protection; the monitor that mainly solves existing apparatus is connected in multiplex section optical switch branch road place; when the optical fiber of service aisle disconnects; the monitor at optical switch place still may detect the reverberation of backlight (optical switch is to optical splitter); and the technical problem that causes optical switch successfully to switch has guaranteed the reliable transmission of wdm system.
For solving the problems of the technologies described above, the present invention is achieved in that
A kind of single fiber bidirectional WDM system realizes the device of multiplex section protection, is arranged in the single fiber bidirectional WDM system that is made of channel layer and multiplex section; This multiplex section comprises optical splitter, selector and the service aisle between the two and protection passage, it is characterized in that described channel layer comprises to be arranged at optical splitter, selector and A, B OMD/OA (deciliter ripple/amplification) assembled unit between OTU (optical convering unit) respectively; One management control unit comprises monitor and controller, and wherein: this monitor is in the receiving terminal of channel layer A to wavelength, is used to monitor the signal quality of multichannel wavelength, and the result is reported controller; This controller is used for the data that monitor reports to be analyzed, and issues protection and switch order and give selector.
Described monitor, selector, controller are in same network element.
Described selector is 1 * 2 optical switch.
A kind of single fiber bidirectional WDM system realizes the method for multiplex section protection, it is characterized in that using aforesaid device, and this method comprises the steps:
A controller configuration protection group, and the transmission channel of wdm system is set to service aisle;
The B monitor is in the receiving terminal monitor signal quality of A to wavelength, if produce alarm, and execution in step C then, otherwise continue monitoring;
The C controller is analyzed according to the data that monitor reports, and judges whether multiplex section has fault; If fault, then execution in step D are arranged; If fault-free then enters the abnormality processing mode;
The D selector switches to the protection passage according to the instruction that controller sends with the system transmissions passage;
The E controller judges whether to have the order that the system transmissions passage is switched to service aisle, if having, then switches to service aisle, and execution in step B; If do not have, then keep repeated execution of steps E after the transmission channel mode.
The described monitor Alarm Unit that to be A provide to the optical convering unit internal interface receiving portions of wavelength receiving terminal.
Described Alarm Unit is provided by clock and data recovery or multiplex/demultiplex chip.
Described Alarm Unit has more than three the tunnel.
By technique scheme, apparatus of the present invention and method have following beneficial effect:
Adopt apparatus and method of the present invention; can overcome when the optical fiber of service aisle disconnects; the monitor at optical switch place still may detect the reverberation of backlight (optical switch is to optical splitter); and the technical problem that causes optical switch successfully to switch; realize the multiplex section protection exchanging of single fiber bidirectional WDM system, guaranteed the reliable transmission of wdm system.
Description of drawings:
Fig. 1 is the principle of device block diagram that traditional single fiber one-way system realizes multiplex section protection;
Fig. 2 is the device block diagram that single fiber bidirectional WDM of the present invention system realizes multiplex section protection;
Fig. 3 is the method flow diagram that single fiber bidirectional WDM of the present invention system realizes multiplex section protection.
Embodiment:
See also Fig. 2, it is the device block diagram that single fiber bidirectional WDM of the present invention system realizes multiplex section protection.As shown in the figure: its similar traditional concurrent excellent receipts principle, but monitor is not on the multiplex section, but be on the channel layer.This device is arranged in the single fiber bidirectional WDM system that is made of channel layer and multiplex section; This multiplex section comprises optical splitter, selector and the service aisle between the two and protection passage; This channel layer comprises and is arranged at optical splitter, selector and A, the B OMD/OA assembled unit between OTU respectively; One management control unit comprises monitor and controller, and wherein: this monitor is in the receiving terminal of channel layer A to wavelength, is used to monitor the signal quality of multichannel wavelength, and the result is reported controller; This controller is used for the data that monitor reports to be analyzed, and issues protection and switch order and give selector.
In concrete enforcement:
This selector is 1 * 2 optical switch, still protects passage according to the command selection service aisle of management control unit.
LOS (Loss ofSignal) Alarm Unit (clock and data recovery or multiplex/demultiplex chip provide) that this monitor provides to the OTU of wavelength receiving terminal internal interface receiving portions for A, monitoring multichannel wavelength; For taking into account protection switch time and probability of miscarriage of justice, recommend to be at least three the tunnel.
This controller is the management control unit core component, can be integrated in the master control borad alarm of inquiry monitor.According to the LOS alarm situation of a plurality of wavelength, whether analysis and judgement multiplex section light path interrupts.Iff having only a passage to report LOS, and other passage is normal, then shows not to be that fault has taken place multiplex section.If multiplex section breaks down, then issue and switch order to selector.
This optical splitter (permanent bridger) is 50: 50 power optical splitters.
As a kind of optimal way: this monitor, selector, controller can be in same network element, and the protection realization of switching need not the transmission network management monitor message like this.
In addition, other part of this single fiber bidirectional WDM system comprises: the wavelength combinations function of single fiber bi-directional is finished in the OMD/OA combination, and OTUal_T represents that the transmitting terminal wavelength is the optical convering unit of al, and OTUal_R represents the optical convering unit of receiving terminal correspondence.
And when often working, service aisle is a single fiber bi-directional, have A to wavelength and B to wavelength; On the protection passage, have only A, do not have B to wavelength to wavelength.When the generation protection is switched, A is only arranged to wavelength on the service aisle, there is not B to wavelength; The existing A of protection passage has B again to wavelength to wavelength.When needs return to service aisle, can issue the Forced Switch order by the extranets interface tube and finish.
Use apparatus of the present invention to realize the concrete steps of multiplex section protection method, see also Fig. 3.As shown in the figure: this method step is:
Steps A: controller configuration protection group the veneer of monitor in the protection group, selector, controller correspondence is set, and the transmission channel of wdm system is set to service aisle; Monitor is that A is to the line side of 3 OTU of receiving terminal LOS warning circuit, as OTUal_R, OTUa2_R, OTUa3_R among Fig. 2.
Step B: monitor is in the receiving terminal monitor signal quality of A to wavelength, if produce alarm, and as SF (inefficacys) or SD (deterioration), execution in step C then, otherwise continue to monitor.
Step C: controller is analyzed according to the data that monitor reports, and judges whether multiplex section has fault; If fault, then execution in step D are arranged; If fault-free then enters the abnormality processing mode.In the system shown in Figure 2, when image intensifer on fiber break or the circuit lost efficacy, all receiving terminal OTU of channel layer can produce the LOS alarm.Iff being that indivedual OTU break down, other OTU can't produce the LOS alarm.Therefore, the OTU report and alarm in the monitor is given controller, after controller is analyzed alarm data, after drawing multiplex section alarm that transmission interrupts taking place, switches order to selecting it to issue protection at once.
Step D: selector switches to the protection passage according to the instruction that controller sends with the system transmissions passage.
Step e: controller judges whether to have the order that the system transmissions passage is switched to service aisle, if having, then switches to service aisle, and execution in step B; If do not have, then keep repeated execution of steps E after the transmission channel mode.
Use said apparatus and step, realized the multiplex section protection exchanging of single fiber bidirectional WDM system, guaranteed the reliable transmission of wdm system.
Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (7)
1. the device of a single fiber bidirectional WDM system realization multiplex section protection is arranged in the single fiber bidirectional WDM system that is made of channel layer and multiplex section; This multiplex section comprises optical splitter, selector and the service aisle between the two and protection passage, it is characterized in that described channel layer comprises that being arranged at optical splitter, selector and A, the B deciliter ripple between optical convering unit respectively amplifies assembled unit; One management control unit comprises monitor and controller, and wherein: this monitor is in the receiving terminal of channel layer A to wavelength, is used to monitor the signal quality of multichannel wavelength, and the result is reported controller; This controller is used for the data that monitor reports to be analyzed, and issues protection and switch order and give selector.
2. single fiber bidirectional WDM according to claim 1 system realizes the device of multiplex section protection, it is characterized in that described monitor, selector, controller are in same network element.
3. single fiber bidirectional WDM according to claim 1 and 2 system realizes the device of multiplex section protection, it is characterized in that described selector is 1 * 2 optical switch.
4. the method for a single fiber bidirectional WDM system realization multiplex section protection is characterized in that using as claim 1 or 2 or 3 described devices, and this method comprises the steps:
A controller configuration protection group, and the transmission channel of wdm system is set to service aisle;
The B monitor is in the receiving terminal monitor signal quality of A to wavelength, if produce alarm, and execution in step C then, otherwise continue monitoring;
The C controller is analyzed according to the data that monitor reports, and judges whether multiplex section has fault; If fault, then execution in step D are arranged; If fault-free then enters the abnormality processing mode;
The D selector switches to the protection passage according to the instruction that controller sends with the system transmissions passage;
The E controller judges whether to have the order that the system transmissions passage is switched to service aisle, if having, then switches to service aisle, and execution in step B; If do not have, then keep repeated execution of steps E after the transmission channel mode.
5. single fiber bidirectional WDM according to claim 4 system realizes the method for multiplex section protection, it is characterized in that the Alarm Unit that described monitor is A to be provided to the optical convering unit internal interface receiving portions of wavelength receiving terminal.
6. single fiber bidirectional WDM according to claim 5 system realizes the method for multiplex section protection, it is characterized in that described Alarm Unit is provided by clock and data recovery or multiplex/demultiplex chip.
7. realize the method for multiplex section protection according to claim 5 or 6 described single fiber bidirectional WDM systems, it is characterized in that described Alarm Unit has more than three the tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101265141A CN101145879A (en) | 2007-03-15 | 2007-06-19 | A device and method for realizing section protection in single fiber bidirectional WDM system |
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| CN200710038113.0 | 2007-03-15 | ||
| CN200710038113 | 2007-03-15 | ||
| CNA2007101265141A CN101145879A (en) | 2007-03-15 | 2007-06-19 | A device and method for realizing section protection in single fiber bidirectional WDM system |
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| CN101145879A true CN101145879A (en) | 2008-03-19 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915279A (en) * | 2016-05-18 | 2016-08-31 | 烽火通信科技股份有限公司 | Method for triggering protection switching based on OTU alarm in WSON |
| CN110380809A (en) * | 2019-07-31 | 2019-10-25 | 瑞斯康达科技发展股份有限公司 | A kind of wave division multiplexing transmission system and its transmission method |
| CN110870231A (en) * | 2017-07-19 | 2020-03-06 | 华为技术有限公司 | Method, device and system for selecting wavelength |
| CN112153496A (en) * | 2019-06-29 | 2020-12-29 | 华为技术有限公司 | Protection switching device and method |
| CN112187344A (en) * | 2019-07-02 | 2021-01-05 | 北京见合八方科技发展有限公司 | Wavelength division passive optical access network system and equipment |
-
2007
- 2007-06-19 CN CNA2007101265141A patent/CN101145879A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915279A (en) * | 2016-05-18 | 2016-08-31 | 烽火通信科技股份有限公司 | Method for triggering protection switching based on OTU alarm in WSON |
| CN105915279B (en) * | 2016-05-18 | 2018-05-29 | 烽火通信科技股份有限公司 | A kind of method based on OTU alarm triggered pretection switch in WSON |
| CN110870231A (en) * | 2017-07-19 | 2020-03-06 | 华为技术有限公司 | Method, device and system for selecting wavelength |
| CN112153496A (en) * | 2019-06-29 | 2020-12-29 | 华为技术有限公司 | Protection switching device and method |
| CN112153496B (en) * | 2019-06-29 | 2022-05-13 | 华为技术有限公司 | Protection switching device and method |
| CN112187344A (en) * | 2019-07-02 | 2021-01-05 | 北京见合八方科技发展有限公司 | Wavelength division passive optical access network system and equipment |
| CN110380809A (en) * | 2019-07-31 | 2019-10-25 | 瑞斯康达科技发展股份有限公司 | A kind of wave division multiplexing transmission system and its transmission method |
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Application publication date: 20080319 |