CN103427900B - A kind of asymmetrical compensation of optical fiber, equipment and system - Google Patents
A kind of asymmetrical compensation of optical fiber, equipment and system Download PDFInfo
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Abstract
The invention discloses a kind of asymmetrical compensation of optical fiber, equipment and system.By there is the equipment side installing optical fibres range unit optical fiber distance measuring device of bidirectional optical fiber connection to carry out the measurement of up-downgoing fiber lengths respectively in the present invention, and report network management system, the compensation of up-downgoing fiber lengths difference is carried out by network management system, broken away from the dependence for time synchronized instrument, the technology that simplifies realizes.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of asymmetrical compensation of optical fiber, equipment and system.
Background technology
TD-SCDMA (TimeDivision-SynchronousCodeDivisionMultipleAccess, TD SDMA) system is a system requiring strict time synchronization, current TD-SCDMA system relies on GPS (GlobalPositioningSystem, global positioning system) time synchronized is accurately provided, 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 existing fiber transmission system, achieve the synchronous solution of passing time at present, comprise based on MSTP (Multi-ServiceTransferPlatform, based on SDH (SynchronousDigitalHierarchy, SDH (Synchronous Digital Hierarchy)) multi-service transport platform), PTN (PacketTransportNetwork, Packet Transport Network), the transmission bearing system delivery time synchronizing information such as OTN (OpticalTransportNetwork, optical transfer network) or router.Realization due to time synchronized is based upon on the identical basis of the upper and lower transmission delay of optical fiber, must adopt the asymmetry value of instrumentation system optical fiber up-downgoing at present, then be arranged by the network management system of equipment, compensate the asymmetry of up-downgoing optical fiber.
Existing network infrastructure is followed successively by Access Layer, convergence-level and core layer from low to high, adopt master-slave synchronisation pattern, time source is positioned at convergence-level or core layer, and based on 1588V2 agreement, fiber optic transmission system provides time synchronized for being positioned at the miscellaneous equipments such as the base station of Access Layer.Upstream device from clock by communicating news with upstream equipment master clock, calculate the time deviation with master clock, amendment local zone time, reach the object of time synchronized.
Equal based on the transmission delay between master-salve clock relative to the calculating of the time deviation of master clock from clock, but it is poor that current two-way two fine system can cause downstream transmission to postpone, namely master clock is issued from the path of clock information and the path Length discrepancy returning master clock message from clock, especially the spacing of master-salve clock is longer, message transmission delay difference may be very large, namely introduce asymmetry error, this just have impact on the accuracy of the time deviation amount calculated, and needs to take measures to compensate non-symmetric error.
The method of carrying out non-symmetric error compensation is at present: before engineering opening, and by the difference size of instrument point-to-point measurement downstream transmission time delay, the mode arranged by webmaster makes the delay of both direction consistent.
Meter Test mode requires higher to instrument self performance, requires that instrument possesses tracking satellite time service function, and possesses split-second precision source; Method of testing is loaded down with trivial details, needs the first locking satellite of instrument, then compares with equipment output time; Test period is long, and instrument locking satellite needs more than several hours, and 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, higher by the up-downgoing asymmetry cost of Meter Test compensated fiber, the cycle is longer, it is loaded down with trivial details to implement.
Summary of the invention
Embodiments provide a kind of asymmetrical compensation of optical fiber, equipment and system, realize in order to simplify the technology of carrying out optical fiber asymmetric compensation.
In the asymmetrical compensation of optical fiber that the embodiment of the present invention provides, at the equipment side that there is bidirectional optical fiber connection, optical fiber distance measuring device is installed, wherein, 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, 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:
First optical fiber distance measuring device sends range finding light pulse signal to the second device orientation, receive the light scattering signal dorsad returned, the time of reception sending moment and described light scattering signal dorsad according to described range finding light pulse signal determines the fiber lengths of the first equipment to the second device orientation, and the fiber lengths determined is reported network management system;
Second optical fiber distance measuring device sends range finding light pulse signal to the first device orientation, receive the light scattering signal dorsad returned, the time of reception sending moment and described light scattering signal dorsad according to described range finding light pulse signal determines the fiber lengths of the second equipment to the first device orientation, and the fiber lengths determined is reported network management system;
The fiber lengths that network management system reports according to the first optical fiber distance measuring device and the fiber lengths that the second optical fiber distance measuring device reports, carry out optical fiber asymmetric compensation.
The optical fiber distance measuring device that the embodiment of the present invention provides, comprising:
Range finding light pulse signal generation module, for generating ranging light pulse signal;
Optical directional coupler, for launching the range finding light pulse signal that described range finding light pulse signal generation module generates, and receives the light scattering signal dorsad returned;
Signal processor, for according to the x time of described range finding light pulse signal with determine fiber lengths the time of reception of described light scattering signal dorsad, and sends to network management system by the fiber lengths determined.
The optical fiber asymmetric bucking-out system that the embodiment of the present invention provides, comprise network management system and above-mentioned optical fiber distance measuring device, wherein, first optical fiber distance measuring device is arranged on the second optical fiber distance measuring device the equipment side that there is bidirectional optical fiber and be connected respectively, 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 that the second optical fiber distance measuring device reports is to the fiber lengths of the first device orientation, carries out optical fiber asymmetric compensation.
The above embodiment of the present invention, by there is the equipment side installing optical fibres range unit optical fiber distance measuring device of bidirectional optical fiber connection to carry out the measurement of up-downgoing fiber lengths, and report network management system, the compensation of up-downgoing fiber lengths difference is carried out by network management system, broken away from the dependence for time synchronized instrument, the technology that simplifies realizes.
Accompanying drawing explanation
The schematic diagram of the optical fiber asymmetric compensation scheme that Fig. 1 provides for the embodiment of the present invention;
The optical fiber asymmetric that Fig. 2 provides for the embodiment of the present invention compensates schematic flow sheet;
The structural representation of the optical fiber asymmetric compensation arrangement that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Fiber optic transmission system is made up of node device and optical fiber, adopts two fine bi-directional configuration.At transmitting terminal, service signal, after node device process, by laser feed-in optical fiber, through Optical Fiber Transmission, arrives the laser of receiving terminal node equipment, then is processed by node device, restore out by service signal.The other optical fiber of reciprocal business feed-in, through same processing procedure.These two optical fiber are independently, may at same optical cable, also may at different optical cables; May through same path, through the node device of equal number, also likely through different paths, through the node device of varying number.So just likely cause the asymmetry of fiber lengths between two stage node devices.Asymmetry reason comprises: with optical cable fibre core error, and optical cable construction continues error, and Cable's Fault continues error, different route optical cable and tail optical fiber error etc.
Isometric in order to ensure the length of up-downgoing optical fiber, need the difference compensating up-downgoing fiber lengths, namely carry out optical fiber asymmetric compensation.
In the optical fiber asymmetric compensation scheme that the embodiment of the present invention provides, by disposing optical fiber distance measuring device in transmission and bearing system, to measure the length of uplink and downlink optical fiber, and range measurement is reported network management system automatically, carry out optical fiber asymmetric compensation by network management system.
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
See Fig. 1, it is the schematic diagram of the optical fiber asymmetric compensation scheme that the embodiment of the present invention provides.As shown in the figure, the transmission bearer equipment that adjacent two exist bidirectional optical fiber connection is installed the optical fiber distance measuring device that the embodiment of the present invention provides.As shown in Figure 1, there is bidirectional optical fiber and be connected in node A and Node B, and the concrete installation site of optical fiber distance measuring device 1, in node A transmitting terminal laser side, is used for measuring the fiber lengths in A → B direction; The concrete installation site of optical fiber distance measuring device 2, in the transmitting terminal laser side of Node B, is used for the fiber lengths in test b → A direction.Wherein, node A can be base station equipment, and Node B can be other transmission bearer equipment, and vice versa.
When node A and Node B not at same machine room, there is larger distance in the Fiber connection between node A and Node B, in this case, 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.
Optical fiber distance measuring device can be an independently device, also can be built in node A in modular form or/and Node B is inner, or independent of outside node device.
The principle of optical fiber distance measuring measurement device distance is: optical fiber distance measuring device launches special light pulse signal, and this light pulse is multiplexed in optical fiber by coupler and service signal, in optical fiber distance measuring device port, then receive the signal returned, and realizes distance and detects.This light pulse signal and service signal use different wavelength, therefore can not affect the normal transmission of service signal.When light pulse signal of finding range transmits in optical fiber, can due to the character of optical fiber itself, connector, junction point, bend or other similar event and produce scattering, reflection, wherein a part of back-scattering light can turn back to optical fiber distance measuring device.Owing to may there is multiple optical connector, junction point in fiber optic transmission system, therefore optical fiber distance measuring device can successively receive multiple back-scattering light, and each back-scattering light time of reception is different, and distance is nearer, and the time is shorter, and distance is far away, and the time is longer.
Optical fiber distance measuring device uses Fei Nieer reflection to carry out the length of measuring optical fiber.Fei Nieer reflection is discrete reflection, it is caused by the optical fiber connector in whole piece optical fiber and junction point etc., these nodes (as the optical fiber connector or junction point) are made up of the factor causing reverse parameter to change, the gap of such as glass and air.On the nodes, have very strong back-scattering light to be reflected back.Optical fiber distance measuring device utilizes Fei Nieer reflected signal to locate these points (as the optical fiber connector or junction point) exactly.Its operation principle is just similar to an echo process, and it first sends a signal to optical fiber, and what signal then observes and a bit returns what come from certain is, thus finds range according to the signal sent and the signal returned.
Optical fiber distance measuring device is according to launching range finding light pulse signal to the light scattering signal dorsad that returns of reception time span used, and the propagation velocity of light in glass substance, namely can calculate optical fiber distance measuring device and the distance dorsad between light scattering signal pip, 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 IOR is optical fibre refractivity to the total time length receiving the light scattering signal dorsad returned after range finding light pulse signal is launched.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 a fiber, institute thinks accurately measuring distance, need optical fiber will input refractive index (IOR), this optical fiber IOR is bright by optical fiber production trade mark, and the instruction by optical fiber relevant parameter obtains this parameter.Because its refractive index after fiber manufacturing is substantially constant, therefore light propagation velocity is in a fiber just constant, like this, measuring distance and time span t are directly proportional, namely distance equals light propagation velocity in a fiber and is multiplied by the propagation time, chooses choosing exactly to the test sample initial sum termination time to measuring distance.
Because optical fiber distance measuring device is arranged on the transmission bearer equipment side of bidirectional optical fiber connection, and when transmission bearer equipment and Fiber connection, needing to use the equipment such as the optical fiber connector, the distance therefore detected by optical fiber distance measuring device is also the fiber lengths of two adjacent 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 process of measurement result, can get rid of measurement result irrational measurement result of several meters, tens meters, tens meters etc.Can pre-set length threshold during concrete enforcement, if measurement result is less than this length threshold, then this measurement result is unreasonable, needs to get rid of this measurement result.Also can pre-set time threshold, if be less than this time threshold from transmitting range finding light pulse signal to the time span received inverse signal, then this time span parameter is unreasonable, needs to get rid of this time span parameter.
Preferably, ranging process can repeatedly carry out, such as, carry out according to setting cycle, and then these results be averaged and show with the form of track, this track just depicts the distribution at whole section of optical fiber inner fiber section.
Below for the installation and deployment of the optical fiber distance measuring device shown in Fig. 1, composition graphs 2 illustrates the flow process of optical fiber Asymmetry compensation.As shown in Figure 3, this flow process can comprise:
Step 201, after fiber lengths detection operation is triggered, optical fiber distance measuring device 1 sends range finding light pulse signal.
During concrete enforcement, fiber lengths detection operation can be triggered execution according to setting cycle, also can trigger execution after receiving operational order.
Step 202, optical fiber distance measuring device 1 receives the backscattering light signal returned.
According to Fei Nieer principle of reflection, range finding light pulse is in the process transmitted along optical fiber to Node B direction, can be there is scattering or reflection in the places such as the optical fiber connector installed at Node B place or junction point, scattering or reflected signal (i.e. backscattering light signal) can turn back to optical fiber distance measuring device 1 along optical fiber.
Step 203, optical fiber distance measuring device 1 sends the time of reception of moment and its backscattering light signal according to range finding light pulse signal, and obtain range measurement, measured distance is the node A at optical fiber distance measuring device 1 place to the fiber lengths on the direction of Node B.Formula (1) specifically can be adopted to calculate.
Step 204, range measurement is outputted to network management system by optical fiber distance measuring device 1.
In like manner, optical fiber distance measuring device 2 is also found range in the manner described above, and range measurement is exported to network management system, and the distance measured by optical fiber distance measuring device 2 is the Node B at optical fiber distance measuring device 2 place to the fiber lengths on the direction of node A.
Step 205, network management system, according to the range measurement of optical fiber distance measuring device 1 and optical fiber distance measuring device 2, is carried out optical fiber asymmetric compensation, is realized the symmetry of transmitted in both directions time delay.
During concrete enforcement, network management system passes through the range measurement 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 compares the difference of these two length, by having arranged the compensation process of up-downgoing fiber lengths between adjacent node.Such as, 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, small signal dispersion or reflection may be produced because of some reason (as fiber kinks), in order to improve Range finding reliability further, the embodiment of the present invention is preferred, adopts one of following measures to filter these interference signals:
Mode one: pre-set duration threshold value, if optical fiber distance measuring device after sending range finding light pulse signal to when receiving signal that it returns, its time span is less than this duration threshold value, then ignore the signal that this returns, and namely not it can be used as range finding foundation.This duration threshold value can be determined according to the order of magnitude of the actual fiber length between adjacent node.
Mode two: pre-set length threshold, if the distance that optical fiber distance measuring device records is less than this length threshold, then ignores this range measurement, does not namely report this range measurement 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: preset signal strength threshold value, if the light signal strength returned that optical fiber distance measuring device receives is lower than setting signal intensity threshold, then ignores this signal, namely not it can be used as range finding foundation.
Mode four: pre-set length threshold, after network management system receives the range measurement that optical fiber distance measuring device reports, if the distance measured by judging is less than this length threshold, then ignores this range measurement, namely not it can be used as asymmetry compensation basis.
In order to improve the accuracy that asymmetry compensates further, the embodiment of the present invention is preferred, and the range measurement that optical fiber distance measuring device repeatedly reports can be averaged by network management system, and the mean value according to repeatedly range measurement carries out asymmetry compensation.
Above-mentioned asymmetry compensation process can be manually initiated by attendant, also can be set to regular initiation.Such as, after optical cable cleft grafting, machine room resettlement etc. have operated, this process can have been manually started, carried out the compensation of optical fiber up-downgoing difference in length; Also can regularly complete automatic range to report, understand the running status of optical fiber.
By describing above and can finding out, because ranging burst and the service signal of optical fiber distance measuring device are mutually isolated, ranging process can not traffic affecting normal transmission, therefore finds range and compensation process can be implemented in line completely and carries out.
See Fig. 3, it is the structural representation of the optical fiber distance measuring device that the embodiment of the present invention provides.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 comprise photoelectric detector 34 further, and the device such as the signal amplifier 35 of necessity, wherein:
Range finding light pulse signal generation module 31, for generating ranging light pulse signal, the wavelength of this signal is specific wavelength, is namely 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 according to master clock 311 generating ranging pulse signal, and exports to optical directional coupler 32 by laser 313.
Optical directional coupler 32, for launching range finding light pulse signal, receives light scattering signal dorsad.
Signal processor 33, for according to determining fiber lengths (specific algorithm can adopt formula 1) time of reception of the x time of ranging burst signal and light scattering signal dorsad, and sends to network management system by the fiber lengths determined.During concrete enforcement, signal processor 33 can receive the output signal of the master clock 311 in range finding light pulse signal generation module 31, receive the light scattering signal dorsad of optical directional coupler 32 or photoelectric detector 34 output, thus obtain find range light pulse signal x time (range finding light pulse signal generation almost identical with x time, its difference can be ignored), and the time of reception of light scattering signal dorsad.
Photoelectric detector 34, for carrying out the process such as filtration to backscattering light signal.Such as, judge that whether light scattering signal intensity is greater than setting threshold dorsad, if so, then exports to signal processor 34; Otherwise, ignore this light scattering signal dorsad, namely not it can be used as range finding foundation.
Further, signal processor 33 also for: if judge, the time span between the x time of ranging burst signal and the time of reception of light scattering signal is dorsad less than setting threshold, then ignore this light scattering signal dorsad; Or after calculating fiber lengths, if judge, this fiber lengths is lower than setting threshold, then refuse this fiber lengths to report network management system.
The embodiment of the present invention additionally provides optical fiber asymmetric 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 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 platform in TD base station stable Perfect Time is provided.Whole process completes automatically.This device can be completely free of the dependence for 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 carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
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 required general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium, comprising some instructions in order to make a station terminal equipment (can be mobile phone, personal computer, server, or the network equipment etc.) perform method described in 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 look protection scope of the present invention.
Claims (14)
1. an asymmetrical compensation of optical fiber, it is characterized in that, the equipment that there is bidirectional optical fiber connection is provided with optical fiber distance measuring device, wherein, 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, second optical fiber distance measuring device is arranged on the second equipment side for detecting the second equipment to the fiber lengths on the first device transmission direction, and the method comprises:
First optical fiber distance measuring device sends range finding light pulse signal to the second device orientation, receive the light scattering signal dorsad returned, the time of reception sending moment and described light scattering signal dorsad according to described range finding light pulse signal determines the fiber lengths of the first equipment to the second device orientation, and the fiber lengths determined is reported network management system;
Second optical fiber distance measuring device sends range finding light pulse signal to the first device orientation, receive the light scattering signal dorsad returned, the time of reception sending moment and described light scattering signal dorsad according to described range finding light pulse signal determines the fiber lengths of the second equipment to the first device orientation, and the fiber lengths determined is reported network management system;
The fiber lengths that network management system reports according to the first optical fiber distance measuring device and the fiber lengths that the second optical fiber distance measuring device reports, carry out optical fiber asymmetric compensation.
2. the method for claim 1, is characterized in that, the method also comprises:
After optical fiber distance measuring device receives the light scattering signal dorsad returned, if the time span between the time of reception sending moment and described light scattering signal dorsad judging described range finding light pulse signal is less than setting threshold, then light scattering signal dorsad described in ignoring;
Or, after optical fiber distance measuring device receives the light scattering signal dorsad returned, if the intensity of light scattering signal is dorsad lower than setting threshold described in judging, then light scattering signal dorsad described in ignoring;
Or optical fiber distance measuring device is after calculating fiber lengths, if judge, described fiber lengths is lower than setting threshold, then refuse described fiber lengths to report 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 optical fiber distance measuring device reports, if judge, described fiber lengths is less than setting threshold, then refuse to carry out optical fiber asymmetric compensation according to described fiber lengths.
4. the method for claim 1, is characterized in that, the fiber lengths that network management system reports according to the first optical fiber distance measuring device and the fiber lengths that the second optical fiber distance measuring device reports, and carries out optical fiber asymmetric compensation, is specially:
Network management system to be averaged calculating according to the fiber lengths that the first optical fiber distance measuring device repeatedly reports, and the fiber lengths repeatedly reported according to the second optical fiber distance measuring device is averaged calculating;
The mean value of the fiber lengths mean value that network management system repeatedly reports according to the first optical fiber distance measuring device and the fiber lengths that the second optical fiber distance measuring device repeatedly reports, carries out optical fiber asymmetric compensation.
5. the method as described in one of claim 1-4, is characterized in that, optical fiber distance measuring device is according to following formulae discovery fiber lengths:
d＝(c×t)/(2×IOR)
Wherein, c is light propagation velocity in a vacuum, and t is that IOR is optical fibre refractivity to the total time length receiving the light scattering signal dorsad returned after range finding light pulse signal sends.
6. the method as described in 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 generating ranging light pulse signal;
Optical directional coupler, for launching the range finding light pulse signal that described range finding light pulse signal generation module generates, and receives the light scattering signal dorsad returned;
Signal processor, for according to the x time of described range finding light pulse signal with determine fiber lengths the time of reception of described light scattering signal dorsad, and the fiber lengths determined is sent to network management system, carry out optical fiber asymmetric compensation to make described network management system according to described fiber lengths; Wherein, described fiber lengths comprises: 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.
8. optical fiber distance measuring device as claimed in claim 7, it is characterized in that, described signal processor also for, if the time span between the time of reception sending moment and described light scattering signal dorsad judging described range finding light pulse signal is less than setting threshold, then light scattering signal dorsad described in ignoring; Or after calculating fiber lengths, if judge, described fiber lengths is lower than setting threshold, then refuse described fiber lengths to report network management system.
9. optical fiber distance measuring device as claimed in claim 7, is characterized in that, also comprise:
Photoelectric detector, for receive described optical directional coupler export light scattering signal dorsad, judge this dorsad light scattering signal intensity whether be greater than setting threshold, if so, then export to described signal processor; Otherwise, ignore this light scattering signal dorsad.
10. the optical fiber distance measuring device as described in one of claim 7-9, is characterized in that, described signal processor specifically for, according to following formulae discovery fiber lengths:
d＝(c×t)/(2×IOR)
Wherein, c is light propagation velocity in a vacuum, and t is that IOR is optical fibre refractivity to the total time length receiving the light scattering signal dorsad returned after range finding light pulse signal sends.
11. optical fiber distance measuring devices as described in one of claim 7-9, it 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.
12. 1 kinds of optical fiber asymmetric bucking-out systems, it is characterized in that, comprise network management system and the optical fiber distance measuring device as described in one of claim 7-9, wherein, first optical fiber distance measuring device is arranged on the second optical fiber distance measuring device the equipment side that there is bidirectional optical fiber and be connected respectively, 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 that the second optical fiber distance measuring device reports is to the fiber lengths of the first device orientation, carries out optical fiber asymmetric compensation.
13. systems as claimed in claim 12, it is characterized in that, described network management system also for, after receiving the fiber lengths that optical fiber distance measuring device reports, if judge, this fiber lengths is less than setting threshold, then refuse to carry out optical fiber asymmetric compensation according to this fiber lengths.
14. systems as claimed in claim 12, it is characterized in that, described network management system to be averaged calculating specifically for, the fiber lengths repeatedly reported according to the first optical fiber distance measuring device, and the fiber lengths repeatedly reported according to the second optical fiber distance measuring device is averaged 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, carries out optical fiber asymmetric compensation.
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| CN105277946A (en) * | 2014-06-09 | 2016-01-27 | 国家电网公司 | Cable laying distance measuring method |
| 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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| CN102368691A (en) * | 2011-09-23 | 2012-03-07 | 烽火通信科技股份有限公司 | Optical link protection switching realizing method in Ethernet passive optical network system |
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