CN102104421A - Branched optical fiber failure detection method and device for optical network, and optical network - Google Patents

Branched optical fiber failure detection method and device for optical network, and optical network Download PDF

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Publication number
CN102104421A
CN102104421A CN2009102580513A CN200910258051A CN102104421A CN 102104421 A CN102104421 A CN 102104421A CN 2009102580513 A CN2009102580513 A CN 2009102580513A CN 200910258051 A CN200910258051 A CN 200910258051A CN 102104421 A CN102104421 A CN 102104421A
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optical fiber
branch optical
optic network
fiber optic
reflecting
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CN102104421B (en
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曾小飞
杨中文
李进
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The embodiment of the invention provides a branched optical fiber failure detection method and a branched optical fiber failure detection device for an optical network, and the optical network. The branched optical fiber failure detection method comprises the following steps of: transmitting a failure testing pulse signal to a branched optical fiber to be tested in the optical network at a preset time period, wherein the optical network comprises more than two branched optical fibers, each branched optical fiber comprises more than two reflecting surfaces and intervals among the reflecting surfaces on different branched optical fibers are unequal; detecting whether reflection peaks with a period which is 1/2 of the preset time period are received or not; if the reflection peaks are received, determining that the branched optical fiber to be tested does not fail; and if the reflection peaks are not received, determining that the branched optical fiber fails. In the method, the device and the optical network provided by the embodiment of the invention, the reflecting surfaces are formed in the branched optical fibers, the failure testing pulse signal can be transmitted at the preset time period, and a branched optical fiber failure in the optical network can be accurately detected.

Description

Branch optical fiber fault detection method, device and fiber optic network in the fiber optic network
Technical field
The embodiment of the invention relates to technical field of optical fiber communication, relates in particular to branch optical fiber fault detection method, device and fiber optic network in a kind of fiber optic network.
Background technology
Time division multiplexing (Time Division Multiplexing, hereinafter to be referred as: TDM) EPON (Passive Optical Network, hereinafter to be referred as: PON) by local side apparatus optical line terminal (Optical Line Termination, hereinafter to be referred as: OLT), remote equipment optical network unit (OpticalNetwork Unit, hereinafter to be referred as: ONU) and Optical Distribution Network (Optical DistributionNetwork, hereinafter to be referred as: ODN) form, wherein ODN mainly is devices such as optical fiber and optical splitter splitter, and concrete can comprise one-level optical splitter or more multistage optical splitter.
The general instrument of detection fiber network failure is optical time domain reflectometer (Optical Time DomainReflectometer, hereinafter to be referred as: OTDR), the basic principle of OTDR is by pulse generator control laser, the pulse of emission optical tests receives the information of returning at the OTDR port then and carries out in optical fiber.When light pulse is transmitted, can produce scattering, reflection owing to character, connector, junction point, bending or other similar incident of optical fiber itself in optical fiber.Wherein Yi Bufen scattering and reflection will turn back among the OTDR.The useful information that returns is measured by the detector of OTDR, from transmitting signals to the used time of inverse signal, determines the speed of light in optical fiber again, just can carry out distance calculation, specifically can see following formula:
d=(c*t)/2(I OR)
Wherein c is a light speed in a vacuum, I ORBe optical fibre refractivity, c/I ORBe exactly the speed that light transmits in optical fiber, and t is that signal emission back is to the total time that receives signal (round trip) (it is exactly the distance of one way that two values multiply each other after 2).
OTDR uses Rayleigh scattering and Fresnel reflection to characterize the characteristic of optical fiber.Wherein Rayleigh scattering is to form owing to light signal produces irregular scattering along optical fiber, and a part of scattered light of OTDR port is got back in the OTDR measurement.These backscatter signals have just shown decay (loss/distance) degree that is caused by optical fiber.Because through all losses to some extent of signal of emission and backscattering after the transmission of a segment distance, what therefore measure is a curve that track is downward, it has illustrated that the power of backscattering constantly reduces.
Fresnel reflection is caused by the indivedual points in the whole piece optical fiber in addition, and these points are made up of the factor that causes reverse parameter to change, for example the gap of optical fiber and air.On these aspects, have very strong back-scattering light and be reflected, Fresnel reflection is much bigger than the Rayleigh reflection, about general big 50db, just 100000 times.Therefore, OTDR utilizes the information of Fresnel reflection to be located by connecting a little usually, fibre-optic terminus or breakpoint.
In other words, the operation principle of OTDR just is similar to a radar.It earlier sends a signal to optical fiber, and what information is observed then and a bit returns what come from certain is.This process can repeatedly be carried out, and then these results is averaged and shows that with the form of track this track has just been described the power (or state of optical fiber) of signal in whole section optical fiber.
General Definition two class incidents in the OTDR system: reflection event and decay incident, so-called reflection event, the reflex that causes owing to reasons such as fibercuts, optical fiber terminal point or connectors embodies the reflection spike on the OTDR test curve exactly; So-called decay incident, be exactly reason such as fibre-optical bending cause have only decay, do not have the phenomenon that obviously reflects spike.
OTDR is applied in the PON system, divide fault location and on-line testing two classes, the former generally is that fault has appearred in network, the staff goes to locate concrete fault with OTDR, the latter generally is always in the connecting system, by system's control cycle or Event triggered remove the test monitoring fiber optic network.In theory can be at the OTDR of access Anywhere of fiber optic network equipment, but the OTDR apparatus expensive is above-mentionedly gone into an OTDR at the OLT side joint, promptly can cooperate with network management system, also realizes that by the optical switch mode multichannel OLT shares an OTDR easily.But, mainly there is following problem in above-mentioned testing scheme, and the one, the decay of Splitter is very big, the test pulse of OTDR is through after the splitter, light intensity very a little less than, the trimmed book that reflects comes just very little, the energy that returns OTDR through splitter is littler, very difficult the detection.Industry best OTDR now also is difficult to detect 1: 16 optical splitter back branch optical fiber decay incident, because this moment, signal was submerged in the noise fully.Because reflection events such as disconnected fibres, the reflection of reeflectance ratio Rayleigh is much bigger, and reflection coefficient is relevant with the evenness of profile of optic fibre, and is more smooth, reflect big more, with regard to easy more detection.The 2nd, OTDR is the catoptrical size of test, and test pulse enters each branch optical fiber through after the splitter, and light pulse all can be reflected in any optical fiber, so the reflection that OTDR measures is actually the stack of each branch optical fiber reflection.That is to say that even OTDR has found the reflectance anomaly point, also being difficult to judge is which root branch optical fiber is out of order.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: for the fiber optic network that is connected with a plurality of branch optical fibers, can't accurately judge the branch optical fiber that breaks down in the prior art.
Summary of the invention
The embodiment of the invention provides branch optical fiber fault detection method, device and fiber optic network in a kind of fiber optic network, in order to solve in the prior art defective that can not be accurately the fault of branch optical fiber in the fiber optic network be detected, the branch optical fiber fault accurately detects in the realization fiber optic network.
Branch optical fiber fault detection method in a kind of fiber optic network, comprise: send the fault test pulse signal with branch optical fiber to be tested in fiber optic network of default time cycle, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, and the spacing between the reflecting surface is unequal on the different branch optical fiber; Detect whether the cycle of receiving is the reflection peak of 1/2 preset time period,, then confirm branch optical fiber fault-free to be tested if receive described reflection peak; If do not receive described reflection peak, confirm that then branch optical fiber to be tested breaks down.
Branch optical fiber failure detector in a kind of fiber optic network, comprise: transmitter module, be used for sending the fault test pulse signal to fiber optic network to be tested with the default time cycle, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, and the spacing between the reflecting surface is unequal on the different branch optical fiber; Detection module is used to detect the reflection peak whether cycle of receiving is 1/2 preset time period, if receive described reflection peak, then confirms branch optical fiber fault-free to be tested; If do not receive described reflection peak, then confirm branch optical fiber fault to be tested.
A kind of fiber optic network comprises fiber optic network node and the plural branch optical fiber that is connected with this fiber optic network node, and wherein each branch optical fiber includes plural reflecting surface, and the spacing between the reflecting surface is unequal on the different branch optical fiber.
Branch optical fiber fault detection method, device and fiber optic network in the fiber optic network that the embodiment of the invention provides, by above-mentioned mode reflecting surface is set in branch optical fiber, can send the fault test pulse signal with the default time cycle, can realize accurate detection branch optical fiber fault in the fiber optic network.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of fiber optic network embodiment of the present invention;
Fig. 2 is the structural representation of a specific embodiment of fiber optic network of the present invention;
Fig. 3 is the structural representation of another specific embodiment of fiber optic network of the present invention;
Fig. 4 is the schematic flow sheet of branch optical fiber fault detection method embodiment in the fiber optic network of the present invention;
Fig. 5 is FDD reflection superimposed curves schematic diagram in specific embodiment of the present invention;
Fig. 6 is FDD reflection superimposed curves schematic diagram in another specific embodiment of the present invention;
Fig. 7 is the structural representation of branch optical fiber failure detector embodiment in the fiber optic network of the present invention;
Fig. 8 is the schematic flow sheet of a specific embodiment of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
At problems of the prior art, a kind of feasible solution is that light boundary device (Fiber demarcation Device is set respectively on each branch optical fiber, hereinafter to be referred as: FDD), and require each FDD unequal apart from the position of OLT, overlapping with the reflection peak of avoiding on OTDR, measuring, in the measuring process of reality, if the FDD on each branch optical fiber is owing to have very big reflection to the OTDR wavelength, just there is a tangible reflection peak position of their correspondences on the OTDR curve, as long as certain reflection peak also exists, the branch optical fiber that then shows this FDD correspondence is no problem, the influence that the fiber lengths that this solution can be brought by variation such as ambient temperature easily changes.The embodiment of the invention provides a kind of fiber optic network, Fig. 1 is the structural representation of fiber optic network embodiment of the present invention, as shown in Figure 1, this fiber optic network comprises fiber optic network node 1 and the plural branch optical fiber 2 that is connected with this fiber optic network node 1, comprise plural reflecting surface 3 respectively at each branch optical fiber 2, if the number of reflecting surface is three when above, spacing between the reflecting surface equates, and the spacing between the reflecting surface is unequal on the different branch optical fiber.On above-mentioned each branch optical fiber more than two, equally spaced reflecting surface constitutes an optical fiber boundary device FDD.
The above embodiment of the present invention is provided with reflecting surface on each branch optical fiber, and the spacing between the reflecting surface on the different branch optical fiber is unequal, for ease of describing, below uses L respectively n(n=1,2, the 3...) spacing between the adjacent reflecting surface on the different branch optical fibers of expression.When being L to spacing of reflecting plane 1Branch optical fiber with 2L 1/ V is that the signal of the reflection on the branch optical fiber between former and later two reflectings surface can produce stack, and forms with L when the time cycle sending the fault test pulse signal 1Be the reflection peak in cycle, wherein, V is the light velocity of fault test pulse signal in described branch optical fiber.And for other branch optical fiber, because the spacing between its reflecting surface is not equal to L 1, therefore can not produce the reflection peak that superposes by reflected signal as mentioned above.
Though should be appreciated that the foregoing description is with 2L 1/ V sends the fault test pulse signal time cycle, but this fault test signal can also be that integral multiple with this time cycle sends in the practical application, is the generation reflection peak that transmits by the reflecting surface with certain intervals at this moment.In the case, can further consider that the spacing of reflecting plane on the different branch optical fibers is set to non-integral multiple relation, on different branch optical fibers, all produce reflection peak to avoid same fault test pulse signal.Under general situation, only need make unequal the getting final product of spacing between the reflecting surface on the different branch optical fibers, can distinguish different branch optical fibers by selecting the suitable fault test pulse signal transmission cycle.
In sum, the fiber optic network that the above embodiment of the present invention provides by sending the fault test pulse signal with the suitable cycle, can be realized branch optical fiber fault in the fiber optic network is accurately detected.
FDD in the above embodiment of the present invention on each branch optical fiber identifies branch optical fiber by the characteristics of itself, and above-mentioned FDD can comprise two or more reflectings surface, FBG or filter composition.Whole reflectings surface on each above-mentioned branch optical fiber can be the part Transflective face of signal of communication, and the fault test pulse signal that can use this moment with signal of communication has an identical wavelength carries out the fault measuring of branch optical fiber.The reflecting surface apart from the optical network node far-end on each branch optical fiber can also be the fully reflecting surface of fault test pulse signal in addition, and can use the fault test pulse signal that is different from the signal of communication wavelength to carry out the fault measuring of branch optical fiber this moment.
The fiber optic network node is OLT in the foregoing description in addition, described fiber optic network can also comprise OTDR, OTDR can be provided with respectively with OLT, also OTDR can be built among the OLT, respectively can be as shown in Figures 2 and 3, Fig. 2 has provided the system configuration schematic diagram of external OTDR in conjunction with the online fault detect of FDD on each branch optical fiber, the initial trunk optical fiber of OLT connects a plurality of branch optical fibers by optical splitter splitter, be connected with ONU at each branch optical fiber end, each branch optical fiber is provided with the FDD that constitutes with the equal intervals reflecting surface by two; OTDR among Fig. 3 is built among the OLT.
In the above embodiment of the present invention, the spacing L between last two reflectings surface of the FDD of each branch optical fiber 1, L 2, L 3... L nUnequal, and it can further be set for non-integral multiple relation, for example can be respectively 3m, 5m, 7m, also can be 0.3m, 0.5m, 0.7m.Minimum spacing between the reflecting surface depends on the resolution of OTDR.
Corresponding with above-mentioned fiber optic network embodiment, the present invention also provides a kind of fault detection method, and Fig. 4 as shown in Figure 4, comprises the steps: for the schematic flow sheet of branch optical fiber fault detection method embodiment in the fiber optic network of the present invention
Step 101, with default be time cycle branch optical fiber transmission fault test pulse signal to be tested in fiber optic network;
Wherein, described fiber optic network can comprise plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, if the number of reflecting surface is three when above, the spacing between the reflecting surface equates, and the spacing between the reflecting surface is unequal on the different branch optical fiber.
Step 102, detect whether to receive to the cycle be the reflection peak of 1/2 preset time period; Wherein said reflection peak is that the transmit stack of periodic fault test pulse signal on the different reflectings surface of branch optical fiber generates.
Step 103, if receive described reflection peak, then confirm branch optical fiber fault-free to be tested, if do not receive described reflection peak, then confirm branch optical fiber fault to be tested.
Branch optical fiber fault detection method in the fiber optic network that present embodiment provides, it is detection method at fiber optic network with plural branch optical fiber, and each branch optical fiber comprises plural reflecting surface, spacing on the different branch optical fibers between the reflecting surface is unequal, send the fault test pulse signal to branch optical fiber to be tested with the default time cycle, the above-mentioned default time cycle can be 2N * L n/ V wherein N is positive integer and can gets N=1 that in specific embodiment V is the light velocity in described branch optical fiber of fault test pulse signal, L nBe the spacing between adjacent two reflectings surface on the fiber optic tap to be measured.After sending above-mentioned fault test pulse signal, be L for being provided with spacing in the fiber optic network to fiber optic network nThe branch optical fiber of reflecting surface, wherein spacing distance is N * L nThe reflected signal of reflecting surface can superpose, form reflection peak; And, then can not form described reflection peak for other branch optical fiber.Therefore present embodiment can be measured different branch optical fibers respectively by send the mode of test pulse with the different cycles, realizes the branch optical fiber in the fiber optic network is carried out fault detect exactly.
In addition, when the reflecting surface that is provided with on the branch optical fiber is the part transmission plane of signal of communication wavelength, can use the fault test pulse signal that has identical wavelength with signal of communication.
Fig. 5 or Fig. 6 have provided FDD reflection superimposed curves schematic diagram in the specific embodiment of the invention, when concrete identification branch optical fiber fault, can be by the OTDR that is built among the OLT, or divide the OTDR be arranged by sending a plurality of pulses in certain hour cycle with OLT, the above-mentioned time cycle can with the spacing proportion relation of reflecting surface on each branch optical fiber, so that under the less situation of the emission ratio of first reflecting surface of FDD, do not need to consider the interreflection between each reflecting surface, on OTDR, can see the reflection peak of some cycles.
When for example Figure 5 shows that the fault of detection branches optical fiber 1, the spacing on this branch optical fiber between the reflecting surface of FDD1 is L 1, OTDR is with time cycle 2L 1/ V sends a string fault test pulse signal, and (spacing of each test pulse on branch optical fiber of this signal is 2L 1When the 1st pulse arrives first reflecting surface, some reflection, a part of transmission is launched when the part of its transmission reaches through the 2nd reflecting surface, when reflected signal arrives with first reflecting surface, the 2nd pulse of OTDR also arrived the 1st reflecting surface and reflected, and above-mentioned two reflected signals stack has just become first reflection peak, by that analogy, just can obtain the reflection peak that a string cycle is L1.Be 2L owing to the cycle simultaneously 1The test pulse of/V by other cycles in other branch optical fibers (being that spacing of reflecting plane is other values) FDD and when being reflected, because spacing of reflecting plane is not corresponding with above-mentioned test pulse among the FDD of described other branch optical fibers, therefore can only individual reflection, the stack of test pulse reflection peak also just can not form L well before and after can not forming 2, L 3... L nIn any one periodic reflection peak.
Equally as shown in Figure 6, for detect the 2nd branch optical fiber whether fault (cycle of its FDD2 is L 2), OTDR is with 2L 2/ V is the fault test pulse signal that sends the time cycle, and just can obtain a string cycle is L 2Reflection peak.
From above-mentioned whether two branch optical fibers are broken down the embodiment that tests as can be seen, OTDR can be with 2L n/ V sends a string test pulse the time cycle, can detection branches optical fiber on the FDD cycle be L nBranch optical fiber whether fault is arranged.OTDR sends the test pulse of different cycles at different time, just can travel through to detect the different branch optical fibers of whole network whether fault is arranged.
Because each FDD correspondence is a string periodic reflection peak, and each is unequal the cycle, and can further set it and also do not become the multiple relation, even some FDD is the same to the distance of OLT so, its the 1st reflection peak is overlapping, but reflection peak is can be not overlapping thereafter.Just overlapping with certain one-level reflection peak of other certain FDD for certain one-level reflection peak of certain FDD in addition, other reflection peak of overlapping front and back can be not overlapping yet, promptly can't form periodic reflection peak.
In addition, the size of reflection peaks at different levels is relevant with the reflection coefficient of two reflectings surface, do not consider decay between the two-stage reflection and the interreflection (reflection coefficient is smaller) between the two-stage reflecting surface, suppose that first reflection coefficient is 0.1, transmission coefficient is 0.9, second reflecting surface reflection coefficient is 0.1 to be example, then the 1st grade is reflected into 0.1 (getting relative size), the 2nd grade of reflection peak is 0.1*0.9+0.1, third level reflection peak is 0.1*0.9*0.9+0.1, by that analogy, if consider repeatedly reflection between two reflectings surface, then what reflection peak of back can be higher, and reflection and transmission coefficient also can be designed as other values certainly.When the test wavelength that uses when test was the same with communication wavelengths, reflection coefficient can design forr a short time, allowed most of luminous power transmission, thereby minimizing is to the influence of proper communication Line Attenuation.
The embodiment of the invention also provides branch optical fiber failure detector in a kind of fiber optic network, this device can be carried out the process step of above-mentioned detection method embodiment, Fig. 7 is the structural representation of branch optical fiber failure detector embodiment in the fiber optic network of the present invention, as shown in Figure 7, this device comprises transmitter module 11 and detection module 12, wherein transmitter module 11 is used for sending the fault test pulse signal with the default time cycle to fiber optic network to be tested, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, if the number of reflecting surface is three when above, spacing between the reflecting surface equates, and the spacing between the reflecting surface is unequal on the different branch optical fiber; Detection module 12 is used to detect the reflection peak whether cycle of receiving is 1/2 preset time period, if receive described reflection peak, then confirms branch optical fiber fault-free to be tested, if do not receive described reflection peak, then confirms branch optical fiber fault to be tested.
Branch optical fiber fault detection method in the fiber optic network that present embodiment provides, it is detection method at fiber optic network with plural branch optical fiber, and each branch optical fiber comprises plural reflecting surface, spacing on the different branch optical fibers between the reflecting surface is unequal, send the fault test pulse signal to branch optical fiber to be tested with the default time cycle, the above-mentioned default time cycle can be 2N * L n/ V wherein N is positive integer and can gets N=1 that in specific embodiment V is the light velocity in described branch optical fiber of fault test pulse signal, L nBe the spacing between adjacent two reflectings surface on the fiber optic tap to be measured.After sending above-mentioned fault test pulse signal, be L for being provided with spacing in the fiber optic network to fiber optic network nThe branch optical fiber of reflecting surface, wherein spacing distance is N * L nThe reflected signal of reflecting surface can superpose, form reflection peak; And, then can not form described reflection peak for other branch optical fiber.Therefore present embodiment can be measured different branch optical fibers respectively by send the mode of test pulse with the different cycles, realizes the branch optical fiber in the fiber optic network is carried out fault detect exactly.
When in specific implementation process, whole fiber optic network being carried out fault test, can comprise steps flow chart as described in Figure 8:
Step 201, FDD lay, and carry out laying of FDD on the point that different branch optical fibers need be demarcated.This separation can be the indoor section in the optical user Access Network and the separation of outdoor section, and the optical fiber of above-mentioned indoor section is responsible for by the user, and the optical fiber of outdoor section is responsible for by the provider customer, therefore need demarcate to it.In the time can receiving reflection peak, illustrate by OLT to the branch optical fiber fault-free the FDD.This step is the FDD that lays different cycles at different branch optical fibers, and for example the cycle of laying is L on branch optical fiber 1 1(be that spacing between the reflecting surface is L 1) FDD, the cycle of laying is L on branch optical fiber 2 2(be that spacing between the reflecting surface is L 2) FDD;
Step 202, with FDD and branch optical fiber or ONU binding, promptly on management system,, so that one one correspondence, and further set up corresponding mapping table the FDD of different cycles and corresponding branch optical fiber or ONU binding.
Step 203, OTDR send test massage n branch optical fiber are tested, and promptly whether the OLT of test branch optical fiber and the part between the FDDn have fault.Wherein the initial value of n can be made as 1, add up successively, and be L for example to the cycle 1Branch optical fiber 1 when testing, OTDR is with time cycle 2L 1/ V sends test pulse;
Step 204, OTDR receive the signal that reflects, and gather reflection peak information;
Step 205, on the basis of above-mentioned steps 204, analyze whether to receive corresponding reflection peak, to judge branch optical fiber whether fault is arranged.For example if the OTDR cycle of receiving is L 1Reflection peak, then illustrate on the branch optical fiber 1 by OLT to fault-free the FDDn, if OTDR does not receive reflection peak, can confirm is having fault by OLT to the FDDn on the branch optical fiber 1, and above-mentioned reflection peak is that the transmit stack of test pulse on the adjacent reflecting surface of branch optical fiber 1 generates.
After above-mentioned steps 205, can continue to return step 203 and continue to send test massage to other branch optical fibers, realize whether fault is judged between whole system each branch optical fiber FDD and the OLT.Such as, OTDR is with time cycle 2L 2/ V sends test pulse, when testing with branch optical fiber 2, by that analogy.
Branch optical fiber fault detection method in fiber optic network that the above embodiment of the present invention provides and the fiber optic network, on optical fiber, be provided with and comprise at least two, the FDD of the equidistant reflecting surface that distributes, wherein the spacing between the reflecting surface of each FDD is unequal or be non-integral multiple relation, and in fiber optic network, use each branch optical fiber transmission fault test pulse signal of above-mentioned FDD with the preset time cycle, the branch optical fiber that only has the respective reflective surfaces spacing can reflect to form reflection peak, then can not form reflection peak for the branch optical fiber with other spacing of reflecting plane.Thus, the embodiment of the invention can realize branch optical fiber in the fiber optic network is carried out fault detect accurately.
Utilize such scheme carrying out the branch optical fiber fault judgement in addition, when FDD lays, without the distance between each FDD of DCO and the OLT, do not need their distance that staggers yet, that only lay on which root branch optical fiber of needs record is the FDD in which kind of cycle, the FDD of different cycles and branch optical fiber are associated,, also do not influence the incidence relation of FDD and branch optical fiber even make the network between OTL and the FDD occur adjusting.Therefore, adopt the scheme of the embodiment of the invention can improve not only that the branch optical fiber fault accurately detects in the fiber optic network, and can improve in the network operation maintenance process and delimit efficient, reduce operator's operation maintenance cost for fault.
The fiber optic network that the above embodiment of the present invention provides also can be applied to can be used for identifying different branch optical fibers in TDM PON or the WDM PON system with branch optical fiber fault detection method in the fiber optic network, also can be used for fiber failure is demarcated.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (15)

1. branch optical fiber fault detection method in the fiber optic network is characterized in that, comprising:
Send the fault test pulse signal with branch optical fiber to be tested in fiber optic network of default time cycle, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, and the spacing between the reflecting surface is unequal on the different branch optical fiber;
Detect whether the cycle of receiving is the reflection peak of 1/2 preset time period;
If receive described reflection peak, then confirm branch optical fiber fault-free to be tested, if do not receive described reflection peak, confirm that then branch optical fiber to be tested breaks down.
2. branch optical fiber fault detection method in the fiber optic network according to claim 1 is characterized in that each branch optical fiber comprises a plurality of reflectings surface, and the spacing between described a plurality of reflecting surface equates.
3. branch optical fiber fault detection method in the fiber optic network according to claim 2 is characterized in that, the spacing on the described different branch optical fibers between the reflecting surface is non-integral multiple relation.
4. branch optical fiber fault detection method in the fiber optic network according to claim 1 is characterized in that, the described default time cycle is 2L nThe integral multiple of/V, wherein L nBe the spacing between adjacent two reflectings surface on the fiber optic tap to be tested, V is the light velocity in described branch optical fiber of fault test pulse signal.
5. according to branch optical fiber fault detection method in each described fiber optic network in the claim 1 to 4, it is characterized in that described reflection peak is the signal that the reflected signal stack of periodic fault test pulse signal on the different reflectings surface of branch optical fiber generates.
6. branch optical fiber fault detection method in the fiber optic network according to claim 1 is characterized in that, described fault test pulse signal has identical wavelength with signal of communication.
7. branch optical fiber failure detector in the fiber optic network is characterized in that, comprising:
Transmitter module, be used for sending the fault test pulse signal to fiber optic network to be tested with the default time cycle, described fiber optic network comprises plural branch optical fiber, and each branch optical fiber comprises plural reflecting surface, and the spacing between the reflecting surface is unequal on the different branch optical fiber;
Detection module is used to detect the reflection peak whether cycle of receiving is 1/2 preset time period, if receive described reflection peak, then confirms branch optical fiber fault-free to be tested; If do not receive described reflection peak, then confirm branch optical fiber fault to be tested.
8. branch optical fiber failure detector in the fiber optic network according to claim 7, it is characterized in that, each branch optical fiber of the fiber optic network that described fault test pulse signal sends to comprises a plurality of reflectings surface, and the spacing between described a plurality of reflecting surface equates.
9. branch optical fiber failure detector in the fiber optic network according to claim 8 is characterized in that, the described default time cycle is 2L nThe integral multiple of/V, wherein L nBe the spacing between adjacent two reflectings surface on the fiber optic tap to be tested, V is the light velocity in described branch optical fiber of fault test pulse signal.
10. according to branch optical fiber failure detector in each described fiber optic network among the claim 7-9, it is characterized in that described reflection peak is the signal that the reflected signal stack of periodic fault test pulse signal on the different reflectings surface of branch optical fiber generates.
11. fiber optic network, comprise fiber optic network node and the plural branch optical fiber that is connected with this fiber optic network node, it is characterized in that each branch optical fiber includes plural reflecting surface, and the spacing between the reflecting surface is unequal on the different branch optical fiber.
12. fiber optic network according to claim 11 is characterized in that, the reflecting surface that each branch optical fiber comprises is at least three, and the spacing between the adjacent reflecting surface equates.
13. fiber optic network according to claim 11 is characterized in that, described reflecting surface is the reflecting surface of Fiber Bragg Grating FBG or filter.
14. according to each described fiber optic network of claim 11-13, it is characterized in that, described fiber optic network node is an optical line terminal, described fiber optic network also comprises optical time domain reflectometer, described optical time domain reflectometer and optical line terminal are provided with respectively, and perhaps described optical time domain reflectometer is built in the optical line terminal.
15. fiber optic network according to claim 11 is characterized in that, the spacing on the described different branch optical fibers between the reflecting surface is non-integral multiple relation.
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