CN103427900A - Method, device and system for asymmetrical compensation of optical fiber - Google Patents
Method, device and system for asymmetrical compensation of optical fiber Download PDFInfo
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- CN103427900A CN103427900A CN2012101563368A CN201210156336A CN103427900A CN 103427900 A CN103427900 A CN 103427900A CN 2012101563368 A CN2012101563368 A CN 2012101563368A CN 201210156336 A CN201210156336 A CN 201210156336A CN 103427900 A CN103427900 A CN 103427900A
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Abstract
The invention discloses a method, device and system for asymmetrical compensation of an optical fiber. According to the method, device and system for asymmetrical compensation of the optical fiber, an optical fiber distance measuring device is arranged beside a device which is in bidirectional optical fiber connection, the optical fiber distance measuring device carries out measurement on the length of an uplink optical fiber and the length of a downlink optical fiber, and reports measurement results to a network management system, compensation of the difference between the length of the uplink optical fiber and the length of the downlink optical fiber is carried out through the network management system, dependence on a time synchronization instrument is eliminated, and technology implementation is simplified.
Description
Technical field
The present invention relates to the communications field, relate in particular to the compensation method of a kind of optical fiber asymmetry, equipment and system.
Background technology
TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) system is the system of a strict time synchronized, the TD-SCDMA system relies on GPS (Global Positioning System at present, global positioning system) provide time synchronized accurately, but the factors such as the national security of considering, project installation and reduction construction cost, minimizing fault, need to provide time synchronized from ground network.In the existing fiber transmission system, realized at present the solution that passing time is synchronous, comprise (the Multi-Service Transfer Platform based on MSTP, based on SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) multi-service transport platform), PTN (Packet Transport Network, Packet Transport Network), the transmission bearing system delivery time synchronizing informations such as OTN (Optical Transport Network, optical transfer network) or router.Because the realization of time synchronized is based upon on the basis that the upper and lower transmission delay of optical fiber is identical, must adopt at present the asymmetry value of instrumentation system optical fiber up-downgoing, then by the network management system setting of equipment, the asymmetry of compensation up-downgoing optical fiber.
Existing network infrastructure is followed successively by Access Layer, convergence-level and core layer from low to high, adopt the master-slave synchronisation pattern, time source is positioned at convergence-level or core layer, and based on the 1588V2 agreement, fiber optic transmission system provides time synchronized for the miscellaneous equipments such as base station that are positioned at Access Layer.Upstream device from clock by communicating news with the upstream equipment master clock, calculate the time deviation with master clock, revise local zone time, reach the purpose of time synchronized.
From the transmission delay of calculating based between master-salve clock of the time deviation of the relative master clock of clock, equate, but at present two-way two fine system can cause the up-downgoing transmission delay differences, be that master clock is issued from the path of clock message and to return to the path of master clock message from clock not isometric, especially between master-salve clock, distance is longer, message transmission delay differs may be very large, namely introduced the asymmetry error, this has just affected the accuracy of the time deviation amount of calculating, the non-symmetric error of need to taking measures to compensate.
The method of carrying out at present the non-symmetric error compensation is: before engineering opening, by the difference size of instrument point-to-point measurement up-downgoing transmission delay, the mode by the webmaster setting makes the delay of both direction consistent.
The Meter Test mode is had relatively high expectations to the instrument self performance, requires instrument to possess tracking satellite time service function, and possesses the split-second precision source; Method of testing is loaded down with trivial details, needs the first locking satellite of instrument, then compares with the equipment output time; Test period is long, and the instrument locking satellite needed more than several hours, and the testing equipment time precision also needs more than several hours.
Under the environment of existing network large scale deployment terrestrial transmission equipment passing time information, the up-downgoing asymmetry cost by the Meter Test compensated fiber is higher, the cycle is long, it is loaded down with trivial details to implement.
Summary of the invention
The embodiment of the present invention provides the compensation method of a kind of optical fiber asymmetry, equipment and system, and the technology of carrying out the compensation of optical fiber asymmetry in order to simplification realizes.
In the optical fiber asymmetry compensation method that the embodiment of the present invention provides, at the equipment side that exists bidirectional optical fiber to connect, the optical fiber distance measuring device is installed, wherein, the first optical fiber distance measuring device is arranged on the first equipment side to detect the first equipment to the fiber lengths on the second device transmission direction, the second optical fiber distance measuring device is arranged on the second equipment side to detect the second equipment to the fiber lengths on the first device transmission direction, and the method comprises:
The first optical fiber distance measuring device sends the range finding light pulse signal to the second device orientation, the light scattering signal dorsad that reception is returned, according to determining the fiber lengths of the first equipment to the second device orientation the time of reception of sending the moment and described light scattering signal dorsad of described range finding light pulse signal, and the fiber lengths of determining is reported to network management system;
The second optical fiber distance measuring device sends the range finding light pulse signal to the first device orientation, the light scattering signal dorsad that reception is returned, according to determining the fiber lengths of the second equipment to the first device orientation the time of reception of sending the moment and described light scattering signal dorsad of described range finding light pulse signal, and the fiber lengths of determining is reported to network management system;
The fiber lengths that the fiber lengths that network management system reports according to the first optical fiber distance measuring device and the second optical fiber distance measuring device report, carry out the compensation of optical fiber asymmetry.
The optical fiber distance measuring device that the embodiment of the present invention provides comprises:
Range finding light pulse signal generation module, for the generating ranging light pulse signal;
Optical directional coupler, the range finding light pulse signal generated for launching described range finding light pulse signal generation module, and receive the light scattering signal dorsad returned;
Signal processor, for determining fiber lengths the time of reception of the x time according to described range finding light pulse signal and described light scattering signal dorsad, and send to network management system by the fiber lengths of determining.
The optical fiber asymmetry bucking-out system that the embodiment of the present invention provides, comprise network management system and above-mentioned optical fiber distance measuring device, wherein, the first optical fiber distance measuring device is arranged on respectively with the second optical fiber distance measuring device the equipment side that exists bidirectional optical fiber to be connected, the first optical fiber distance measuring device is arranged on the first equipment side to detect the first equipment to the fiber lengths on the second device transmission direction, and the second optical fiber distance measuring device is arranged on the second equipment side to detect the second equipment to the fiber lengths on the first device transmission direction;
The first equipment that described network management system reports according to the first optical fiber distance measuring device is to the fiber lengths of the second device orientation, and the second equipment of reporting of the second optical fiber distance measuring device carries out the compensation of optical fiber asymmetry to the fiber lengths of the first device orientation.
The above embodiment of the present invention, by the equipment side installing optical fibres range unit optical fiber distance measuring device existing bidirectional optical fiber to connect to carry out the measurement of up-downgoing fiber lengths, and report network management system, carry out the compensation of up-downgoing fiber lengths difference by network management system, break away from the dependence for the time synchronized instrument, simplified the technology realization.
The accompanying drawing explanation
The schematic diagram of the optical fiber asymmetry compensation scheme that Fig. 1 provides for the embodiment of the present invention;
The optical fiber asymmetry compensation schematic flow sheet that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the optical fiber asymmetry compensation arrangement that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Fiber optic transmission system is comprised of node device and optical fiber, adopts two fine bi-directional configuration.At transmitting terminal, service signal, after node device is processed, by laser feed-in optical fiber, through Optical Fiber Transmission, arrives the laser of receiving terminal node equipment, then is processed by node device, and service signal is restored out.The other optical fiber of reciprocal business feed-in, through same processing procedure.These two optical fiber are independently, may be at same optical cables, and also may be at different optical cables; May pass through same path, the node device through equal number, also likely pass through different paths, through the node device of varying number.So just likely cause the asymmetry of fiber lengths between two stage node devices.The asymmetry reason comprises: with optical cable fibre core error, and the optical cable construction error that continues, the Cable's Fault error that continues, different route optical cable and tail optical fiber error etc.
Isometric for the length that guarantees up-downgoing optical fiber, the difference of needs compensation up-downgoing fiber lengths, carry out the compensation of optical fiber asymmetry.
In the optical fiber asymmetry compensation scheme that the embodiment of the present invention provides, by dispose the optical fiber distance measuring device in transmission and bearing system, to measure the length of uplink and downlink optical fiber, and the result of finding range reports network management system automatically, by network management system, carries out the compensation of optical fiber asymmetry.
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Referring to Fig. 1, the schematic diagram of the optical fiber asymmetry compensation scheme provided for the embodiment of the present invention.As shown in the figure, on two adjacent transmission bearer equipment that exist bidirectional optical fiber to connect, the optical fiber distance measuring device that the embodiment of the present invention provides is installed.As shown in Figure 1, node A exists bidirectional optical fiber to be connected with Node B, and the concrete installation site of optical fiber distance measuring device 1, in node A transmitting terminal laser one side, is used for measuring the fiber lengths of A → B direction; The concrete installation site of optical fiber distance measuring device 2 is in transmitting terminal laser one side of Node B, is used for the fiber lengths of test b → A direction.Wherein, node A can be base station equipment, and Node B can be other transmission bearer equipment, and vice versa.
In the situation that node A and Node B be not at same machine room, there is larger distance in optical fiber connection between node A and Node B, in this case, the optical fiber distance measuring device also can be arranged in node device, is used for the length of the bidirectional optical fiber between test node A and Node B.
The optical fiber distance measuring device can be an independently device, also can be built in node A with the form of module or/and Node B inside, or be independent of outside node device.
The principle of optical fiber distance measuring measurement device distance is: the optical fiber distance measuring device is launched special light pulse signal, and this light pulse is multiplexed in optical fiber by coupler and service signal, then on the optical fiber distance measuring device port, receives the signal returned, and realizes that distance detects.This light pulse signal is used different wavelength from service signal, therefore can not affect the normal transmission of service signal.When the range finding light pulse signal transmits in optical fiber, can produce scattering, reflection due to character, connector, junction point, bending or other similar event of optical fiber itself, wherein a part of back-scattering light can turn back to the optical fiber distance measuring device.Owing in fiber optic transmission system, may having a plurality of optical connectors, junction point, so the optical fiber distance measuring device can successively receive a plurality of back-scattering lights, each back-scattering light time of reception difference, and distance is nearer, and the time is shorter, and distance is far away, and the time is longer.
Optical fiber distance measuring device Yong Fei Nieer reflects the length of measuring optical fiber.Fei Nieer reflection is discrete reflection, and its optical fiber connector in whole piece optical fiber and junction point etc. cause, these nodes (as the optical fiber connector or junction point) are comprised of the factor that causes reverse parameter to change, for example the gap of glass and air.On these nodes, have very strong back-scattering light and be reflected back.The optical fiber distance measuring device utilizes the Fei Nieer reflected signal to locate these points (as the optical fiber connector or junction point) exactly.Its operation principle just is similar to an echo process, and it first sends a signal to optical fiber, and what signal then observes and a bit returns to what come from certain is, thereby is found range according to the signal sent and the signal that returns.
The time span used of light scattering signal dorsad that the optical fiber distance measuring device returns to reception according to emission range finding light pulse signal, and the propagation velocity of light in glass substance, can calculate optical fiber distance measuring device and the distance between the light scattering signal pip dorsad, its computing formula is as follows:
d＝(c×t)/2(IOR)..........................................[1]
In above-mentioned formula, c is light propagation velocity in a vacuum, and t is that the emission of range finding light pulse signal is rear to the total time length that receives the light scattering signal dorsad returned, and IOR is optical fibre refractivity.Because t is two-way time length, therefore need to obtain one way distance d divided by 2.Because light is slower than propagation velocity in a vacuum in optical fiber, institute thinks accurately measuring distance, need optical fiber will input refractive index (IOR), this optical fiber IOR is bright by the optical fiber production trade mark, can obtain this parameter by the indication of optical fiber relevant parameter.Because its refractive index after fiber manufacturing is substantially constant, therefore the propagation velocity of light in optical fiber is just constant, like this, measuring distance and time span t are directly proportional, be multiplied by the propagation time apart from equaling the propagation velocity of light in optical fiber, to the choosing the test sample initial sum termination time exactly of choosing of measuring distance.
Because the optical fiber distance measuring device is arranged on the transmission bearer equipment side that bidirectional optical fiber connects, and transmission bearer equipment need to be used the equipment such as the optical fiber connector while being connected with optical fiber, it by the detected distance of optical fiber distance measuring device, is also therefore the fiber lengths of adjacent two transmission bearer equipment rooms.
In Practical Project, distance between two transmission bearer equipment is generally more than tens kilometers or tens kilometers, therefore the embodiment of the present invention is preferred, in the processing of measurement result, can get rid of measurement result irrational measurement result of several meters, tens meters, tens meters etc.Can set in advance length threshold during concrete enforcement, if measurement result is less than this length threshold, this measurement result is unreasonable, needs to get rid of this measurement result.Also can set in advance time threshold, if be less than this time threshold from emission range finding light pulse signal to the time span received inverse signal, this time span parameter is unreasonable, needs to get rid of this time span parameter.
Preferably, ranging process can repeatedly carry out, and for example according to setting cycle, carries out, and then these results is averaged and shows with the form of track, and this track has just been described the distribution at whole section optical fiber inner fiber section.
The installation and deployment of the optical fiber distance measuring device shown in Fig. 1 of below take are example, and the flow process of optical fiber Asymmetry compensation is described in conjunction with Fig. 2.As shown in Figure 3, this flow process can comprise:
During concrete enforcement, fiber lengths detects operation can, according to the setting cycle execution that is triggered, also can trigger execution after receiving operational order.
According to the Fei Nieer principle of reflection, the range finding light pulse is in the process of the transmission along optical fiber to the Node B direction, the optical fiber connector of installing at the Node B place or junction point etc. are located scattering or reflection can occur, and scattering or reflected signal (being the backscattering light signal) can turn back to optical fiber distance measuring device 1 along optical fiber.
In like manner, optical fiber distance measuring device 2 is also found range in the manner described above, and the result of finding range exports to network management system, and the Node B that the measured distance of optical fiber distance measuring device 2 is optical fiber distance measuring device 2 places is to the fiber lengths on the direction of node A.
During concrete enforcement, network management system, by the range finding result of optical fiber distance measuring device 1 and optical fiber distance measuring device 2, obtain the fiber lengths of node A to Node B, and Node B is to the fiber lengths of node A.Network management system is the difference of these two length relatively, by the compensation process of up-downgoing fiber lengths between adjacent node has been set.For example, A → B optical fiber is 39.8 kilometers, B → A optical fiber is 41.5 kilometers, differ 1.7 kilometers, according to formula t (delay)=d/ (c*IOR), can calculate propagation delay time t (delay)=1700/200000000=8.5 μ s, webmaster can be the time delay that signal increases by 8.5 μ s in A → B direction.
Consider on the optical fiber transmission path between node A and Node B, may produce small signal dispersion or reflection because of some reason (as the optical fiber bending), in order further to improve Range finding reliability, the embodiment of the present invention is preferred, adopts one of following measures to filter these interference signals:
Mode one: set in advance the duration threshold value, if the optical fiber distance measuring device after sending the range finding light pulse signal when receiving the signal that it returns, its time length is less than this duration threshold value, ignores the signal that this returns, not using it as the foundation of finding range.This duration threshold value can be determined according to the order of magnitude of the actual fiber length between adjacent node.
Mode two: set in advance length threshold, if the distance that the optical fiber distance measuring device records is less than this length threshold, ignore this range finding result, do not report this range finding result to network management system.This length threshold can be determined according to the order of magnitude of the actual fiber length between adjacent node.
Mode three: the preset signals intensity threshold, if the light signal strength returned that the optical fiber distance measuring device receives is ignored this signal lower than the setting signal intensity threshold, not using it as the range finding foundation.
Mode four: set in advance length threshold, after network management system receives the range finding result that the optical fiber distance measuring device reports, if judge, measured distance is less than this length threshold, ignores this range finding result, not using it as the asymmetry compensation basis.
In order further to improve the accuracy of asymmetry compensation, the embodiment of the present invention is preferred, and the range finding result that network management system can repeatedly report the optical fiber distance measuring device averages, and according to the mean value of the result of repeatedly finding range, carries out the asymmetry compensation.
Above-mentioned asymmetry compensation process can be manually to initiate by the attendant, also can be set to regular initiation.For example, after the operations such as optical cable cleft grafting, machine room resettlement complete, can manually start this process, carry out the compensation of optical fiber up-downgoing difference in length; Also can regularly complete automatic range and report, understand the running status of optical fiber.
By above description, can find out, because range finding pulse and the service signal of optical fiber distance measuring device are isolated mutually, ranging process can the traffic affecting normal transmission, and therefore range finding and compensation process can be realized carrying out online fully.
Referring to Fig. 3, the structural representation of the optical fiber distance measuring device provided for the embodiment of the present invention.As shown in the figure, this device can comprise: range finding light pulse signal generation module 31, optical directional coupler 32, signal processor 33, also can further comprise photoelectric detector 34, and the necessary devices such as signal amplifier 35, wherein:
Range finding light pulse signal generation module 31, for the generating ranging light pulse signal, the wavelength of this signal is specific wavelength, is different from the wavelength of service signal.Concrete, this module can comprise master clock 311, pulse generator 312 and laser 313, and wherein, pulse generator 312 is according to master clock 311 generating ranging pulse signals, and exports to optical directional coupler 32 by laser 313.
Optical directional coupler 32, for launching the range finding light pulse signal, receive light scattering signal dorsad.
Further, signal processor 33 also for: if the x time of judgement range finding pulse signal and dorsad the time span between time of reception of light scattering signal be less than setting threshold, ignore this light scattering signal dorsad; Perhaps, after calculating fiber lengths, if judge, this fiber lengths is lower than setting threshold, and refusal reports network management system by this fiber lengths.
The embodiment of the present invention also provides optical fiber asymmetry bucking-out system, and this system comprises above-mentioned optical fiber distance measuring device and network management system, and wherein, the installation and deployment of optical fiber distance measuring device as previously mentioned, do not repeat them here.
In sum, the embodiment of the present invention completes the measurement of up-downgoing fiber lengths by the optical fiber distance measuring device, and reports the compensation that network management system completes up-downgoing fiber lengths difference, thus for comprise all kinds of business platforms in TD base station stable Perfect Time is provided.Whole process completes automatically.This device can be completely free of the dependence for the time synchronized instrument, and whole process can complete in 5～10 minutes, at a high speed effectively.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential general hardware platform by software and realize, can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Understanding based on such, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a station terminal equipment (can be mobile phone, personal computer, server, or the network equipment etc.) the described method of execution each embodiment of the present invention.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
Claims (14)
1. optical fiber asymmetry compensation method, it is characterized in that, on the equipment that exists bidirectional optical fiber to connect, the optical fiber distance measuring device is installed, wherein, the first optical fiber distance measuring device is arranged on the first equipment side to detect the first equipment to the fiber lengths on the second device transmission direction, the second optical fiber distance measuring device be arranged on the second equipment side for detection of the second equipment to the fiber lengths on the first device transmission direction, the method comprises:
The first optical fiber distance measuring device sends the range finding light pulse signal to the second device orientation, the light scattering signal dorsad that reception is returned, according to determining the fiber lengths of the first equipment to the second device orientation the time of reception of sending the moment and described light scattering signal dorsad of described range finding light pulse signal, and the fiber lengths of determining is reported to network management system;
The second optical fiber distance measuring device sends the range finding light pulse signal to the first device orientation, the light scattering signal dorsad that reception is returned, according to determining the fiber lengths of the second equipment to the first device orientation the time of reception of sending the moment and described light scattering signal dorsad of described range finding light pulse signal, and the fiber lengths of determining is reported to network management system;
The fiber lengths that the fiber lengths that network management system reports according to the first optical fiber distance measuring device and the second optical fiber distance measuring device report, carry out the compensation of optical fiber asymmetry.
2. the method for claim 1, is characterized in that, the method also comprises:
After the optical fiber distance measuring device receives the light scattering signal dorsad returned, if judge described range finding light pulse signal send constantly and the time span between time of reception of described light scattering signal dorsad is less than setting threshold, ignore described light scattering signal dorsad;
Perhaps, after the optical fiber distance measuring device receives the light scattering signal dorsad returned, if the intensity that judges described light scattering signal dorsad lower than setting threshold, is ignored described light scattering signal dorsad;
Perhaps, the optical fiber distance measuring device is after calculating fiber lengths, if judge, described fiber lengths is lower than setting threshold, refuses described fiber lengths is reported to network management system.
3. the method for claim 1, is characterized in that, the method also comprises:
After network management system receives the fiber lengths that the optical fiber distance measuring device reports, if judge, described fiber lengths is less than setting threshold, refuses to carry out the compensation of optical fiber asymmetry according to described fiber lengths.
4. the method for claim 1, is characterized in that, the fiber lengths that the fiber lengths that network management system reports according to the first optical fiber distance measuring device and the second optical fiber distance measuring device report, carry out the compensation of optical fiber asymmetry, is specially:
The fiber lengths that network management system repeatedly reports according to the first optical fiber distance measuring device averages calculating, and the fiber lengths repeatedly reported according to the second optical fiber distance measuring device averages calculating;
The mean value of the fiber lengths that the fiber lengths mean value that network management system repeatedly reports according to the first optical fiber distance measuring device and the second optical fiber distance measuring device repeatedly report, carry out the compensation of optical fiber asymmetry.
5. method as described as one of claim 1-4, is characterized in that, the optical fiber distance measuring device calculates fiber lengths according to following formula:
d＝(c×t)/2(IOR)
Wherein, c is light propagation velocity in a vacuum, t be the range finding light pulse signal send after to the total time length that receives the light scattering signal dorsad returned, IOR is optical fibre refractivity.
6. method as described as one of claim 1-4, is characterized in that, the wavelength of described range finding light pulse signal is different from the wavelength of service signal.
7. an optical fiber distance measuring device, is characterized in that, comprising:
Range finding light pulse signal generation module, for the generating ranging light pulse signal;
Optical directional coupler, the range finding light pulse signal generated for launching described range finding light pulse signal generation module, and receive the light scattering signal dorsad returned;
Signal processor, for determining fiber lengths the time of reception of the x time according to described range finding light pulse signal and described light scattering signal dorsad, and send to network management system by the fiber lengths of determining.
8. optical fiber distance measuring device as claimed in claim 7, it is characterized in that, described signal processor also for, if judge described range finding light pulse signal send constantly and the time span between time of reception of described light scattering signal dorsad is less than setting threshold, ignore described light scattering signal dorsad; Perhaps, after calculating fiber lengths, if judge, described fiber lengths is lower than setting threshold, refuses described fiber lengths is reported to network management system.
9. optical fiber distance measuring device as claimed in claim 7, is characterized in that, also comprises:
Photoelectric detector, for receiving the light scattering signal dorsad of described optical directional coupler output, judge this dorsad light scattering signal intensity whether be greater than setting threshold, if export to described signal processor; Otherwise, ignore this light scattering signal dorsad.
10. optical fiber distance measuring device as described as one of claim 7-9, is characterized in that, described signal processor specifically for, calculate fiber lengths according to following formula:
d＝(c×t)/2(IOR)
Wherein, c is light propagation velocity in a vacuum, t be the range finding light pulse signal send after to the total time length that receives the light scattering signal dorsad returned, IOR is optical fibre refractivity.
11. optical fiber distance measuring device as described as one of claim 7-9, is characterized in that, the wavelength of the range finding light pulse signal that described range finding light pulse signal generation module generates is different from the wavelength of service signal.
A 12. optical fiber asymmetry bucking-out system, it is characterized in that, comprise network management system and optical fiber distance measuring device as described as one of claim 7-9, wherein, the first optical fiber distance measuring device is arranged on respectively with the second optical fiber distance measuring device the equipment side that exists bidirectional optical fiber to be connected, the first optical fiber distance measuring device is arranged on the first equipment side to detect the first equipment to the fiber lengths on the second device transmission direction, and the second optical fiber distance measuring device is arranged on the second equipment side to detect the second equipment to the fiber lengths on the first device transmission direction;
The first equipment that described network management system reports according to the first optical fiber distance measuring device is to the fiber lengths of the second device orientation, and the second equipment of reporting of the second optical fiber distance measuring device carries out the compensation of optical fiber asymmetry to the fiber lengths of the first device orientation.
13. system as claimed in claim 12, it is characterized in that, described network management system also for, after receiving the fiber lengths that the optical fiber distance measuring device reports, if judge, this fiber lengths is less than setting threshold, refuses to carry out the compensation of optical fiber asymmetry according to this fiber lengths.
14. system as claimed in claim 12, it is characterized in that, described network management system specifically for, the fiber lengths repeatedly reported according to the first optical fiber distance measuring device averages calculating, the fiber lengths repeatedly reported according to the second optical fiber distance measuring device averages calculating; The mean value of the fiber lengths that the fiber lengths mean value repeatedly reported according to the first optical fiber distance measuring device and the second optical fiber distance measuring device repeatedly report, carry out the compensation of optical fiber asymmetry.
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| CN105187275B (en) * | 2015-08-28 | 2018-05-29 | 四川泰富地面北斗科技股份有限公司 | A kind of method and device for measuring the asymmetric time delay of fiber transmission link |
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