CN102104421B - 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 PDFInfo
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- CN102104421B CN102104421B CN200910258051.3A CN200910258051A CN102104421B CN 102104421 B CN102104421 B CN 102104421B CN 200910258051 A CN200910258051 A CN 200910258051A CN 102104421 B CN102104421 B CN 102104421B
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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
Technical field
The embodiment of the present invention relates to technical field of optical fiber communication, particularly relates 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 referred to as: TDM) EPON (Passive Optical Network, hereinafter referred to as: PON) by local side apparatus optical line terminal (Optical Line Termination, hereinafter referred to as: OLT), remote equipment optical network unit (OpticalNetwork Unit, hereinafter referred to as: ONU) and Optical Distribution Network (Optical DistributionNetwork, hereinafter referred to as: ODN) form, the wherein ODN mainly device such as optical fiber and optical splitter splitter, 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 referred to as: OTDR), the general principle of OTDR controls laser by pulse generator, utilizing emitted light test pulse is in optical fiber, and the information then returned at OTDR port accepts is carried out.When light pulse is transmitted 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 the scattering of a part will turn back in OTDR with reflection.The useful information returned is measured by the detector of OTDR, from transmitting signals to the inverse signal time used, then determines light speed in a fiber, just can carry out distance and calculate, specifically can see following formula:
d＝(c*t)/2(I
OR)
Wherein c is light speed in a vacuum, I
oRoptical fibre refractivity, c/I
oRbe exactly the speed that light transmits in a fiber, and t after to be signal launch to the total time (two values are multiplied divided by the distance after 2 being exactly one way) receiving signal (round trip).
OTDR uses Rayleigh scattering and Fresnel reflection to characterize the characteristic of optical fiber.Wherein Rayleigh scattering is formed because light signal produces irregular scattering along optical fiber, and a part of scattered light of OTDR port is got back in OTDR measurement.These backscatter signals just indicate decay (loss/distance) degree caused by optical fiber.Owing to launching and the signal loss all to some extent of backscattering after the transmission of a segment distance, the curve that what therefore measurement obtained an is track is downward, the power that there is illustrated backscattering constantly reduces.
Fresnel reflection is caused by the indivedual points in whole piece optical fiber in addition, and these points are made up of the factor causing reverse parameter to change, the gap of such as optical fiber and air.On these aspects, have very strong back-scattering light and be reflected back, Fresnel reflection is much bigger compared to Rayleigh reflection, general large about 50db, namely 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 is just similar to a radar.It first sends a signal to optical fiber, and what information is then observed and a bit returns what come from certain is.This process can repeatedly be carried out, and then these results is averaged and shows with the form of track, and this track just depicts the power (or state of optical fiber) of signal in whole section of optical fiber.
General definition two class events in OTDR system: reflection event and decay events, so-called reflection event, exactly due to the reflex that the reasons such as fibercuts, optical fiber terminal or connector cause, OTDR test curve embodies reflective cusps; So-called decay events, be exactly the reasons such as fibre-optical bending cause only have decay, there is no the phenomenon of obvious reflective cusps.
OTDR is applied in PON system, divide fault location and on-line testing two class, the former is generally that fault has appearred in network, staff goes to locate concrete fault with OTDR, the latter is generally always in connecting system, and what by Systematical control, periodic or event was triggering removes test monitoring fiber optic network.In theory can at the OTDR of the access Anywhere equipment of fiber optic network, but OTDR apparatus expensive, above-mentionedly enter an OTDR at OLT side joint, namely can coordinate with network management system, also easily realize multichannel OLT by optical switch mode and share an OTDR.But, mainly there is following problem in above-mentioned testing scheme, and one is that the decay of Splitter is very large, the test pulse of OTDR is after splitter, and light intensity is very weak, and the light reflected is natively very little, the energy returning OTDR through splitter is less, very difficult detection.The now best OTDR of industry is also difficult to detect branch optical fiber decay events after 1: 16 optical splitter, because now signal is submerged in noise completely.Due to 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, more smooth, reflects larger, more easily detects.Two is OTDR is the sizes of testing reverberation, and test pulse, after splitter, enters each branch optical fiber, and light pulse all can be reflected in any optical fiber, so the reflection that OTDR measures is actually the superposition of each branch optical fiber reflection.That is, even if OTDR has found reflectance anomaly point, being also difficult to judgement has been which root branch optical fiber is out of order.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems: for the fiber optic network being connected with multiple branch optical fiber, accurately cannot judge the branch optical fiber broken down in prior art.
Summary of the invention
The embodiment of the present invention provides branch optical fiber fault detection method, device and fiber optic network in a kind of fiber optic network, accurately to the defect that the fault of branch optical fiber in fiber optic network detects, branch optical fiber fault in fiber optic network can not be realized and accurately detects in order to solve in prior art.
Branch optical fiber fault detection method in a kind of fiber optic network, comprise: send fault test pulse signal with the branch optical fiber that the time cycle of presetting is to be tested in fiber optic network, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, and spacing on different branch optical fiber between reflecting surface is unequal; Detect and whether receive the reflection peak that the cycle is 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, then confirm that branch optical fiber to be tested breaks down.
Branch optical fiber failure detector in a kind of fiber optic network, comprise: transmitter module, for sending fault test pulse signal with the time cycle of presetting to fiber optic network to be tested, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, and spacing on different branch optical fiber between reflecting surface is unequal; Whether detection module, receive for detecting the reflection peak that the cycle 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, the plural branch optical fiber comprising fiber optic network node and be connected with this fiber optic network node, wherein each branch optical fiber includes plural reflecting surface, and spacing on different branch optical fiber between reflecting surface is unequal.
Branch optical fiber fault detection method, device and fiber optic network in the fiber optic network that the embodiment of the present invention provides, by above-mentioned mode, reflecting surface is set in branch optical fiber, fault test pulse signal can be sent with the time cycle of presetting, the accurate detection to branch optical fiber fault in fiber optic network can be realized.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained 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 fiber optic network of the present invention specific embodiment;
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 fiber optic network of the present invention;
Fig. 5 is that in the present invention's specific embodiment, FDD reflects superimposed curves schematic diagram;
Fig. 6 is that in another specific embodiment of the present invention, FDD reflects superimposed curves schematic diagram;
Fig. 7 is the structural representation of branch optical fiber failure detector embodiment in fiber optic network of the present invention;
Fig. 8 is the schematic flow sheet of the present invention's specific embodiment.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For problems of the prior art, a kind of feasible solution is on each branch optical fiber, arrange light boundary device (Fiber demarcation Device respectively, hereinafter referred to as: FDD), and require that the position of each FDD distance OLT is unequal, to avoid the reflection peak overlap measured on OTDR, in the measuring process of reality, if the FDD on each branch optical fiber is owing to having very large reflection to OTDR wavelength, just there is an obvious reflection peak position of their correspondences on OTDR curve, as long as certain reflection peak also exists, then show that the branch optical fiber that this FDD is corresponding is no problem, this solution easily can change the impact of the fiber lengths change brought by ambient temperature etc.Embodiments provide 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, the plural branch optical fiber 2 that this fiber optic network comprises fiber optic network node 1 and is connected with this fiber optic network node 1, if when the number that each branch optical fiber 2 comprises plural reflecting surface 3 reflecting surface is respectively more than three, spacing between reflecting surface is equal, and spacing on different branch optical fiber between reflecting surface is unequal.Two or more on above-mentioned each branch optical fiber, equally spaced reflecting surface form an optical fiber boundary device FDD.
The above embodiment of the present invention arranges reflecting surface on each branch optical fiber, and spacing between reflecting surface on different branch optical fiber is unequal, for ease of describing, uses L respectively below
n(n=1,2,3...) represents the spacing between neighboring reflection face on different branch optical fiber.When being L to spacing of reflecting plane
1branch optical fiber with 2L
1/ V is that when the time cycle sending fault test pulse signal, the signal of the reflection on branch optical fiber between former and later two reflectings surface can produce superposition, and is formed with L
1for 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 superposed by reflected signal as mentioned above.
Although should be appreciated that above-described embodiment is with 2L
1/ V sends fault test pulse signal the time cycle, but in practical application, this fault test signal can also be send with the integral multiple of this time cycle, is now by the generation reflection peak that transmits of the reflecting surface with certain intervals.In the case, can further consider and the spacing of reflecting plane on different branch optical fiber is set to non-integer multiple, on different branch optical fibers, all produce reflection peak to avoid same fault test pulse signal.When general, only the spacing on different branch optical fiber between reflecting surface need being made unequal, different branch optical fibers can be distinguished 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 fault test pulse signal with the suitable cycle, can realize accurately detecting branch optical fiber fault in fiber optic network.
FDD in the above embodiment of the present invention on each branch optical fiber identifies branch optical fiber by the feature 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 fractional transmission reflecting surface of signal of communication, and the fault test pulse signal with signal of communication with phase co-wavelength now can be used to carry out the fault measuring of branch optical fiber.The reflecting surface of the distance optical network node far-end in addition on each branch optical fiber can also be the fully reflecting surface of fault test pulse signal, and the fault test pulse signal being different from signal of communication wavelength now can be used to carry out the fault measuring of branch optical fiber.
In above-described embodiment, fiber optic network node is OLT in addition, described fiber optic network can also comprise OTDR, OTDR can be arranged respectively with OLT, also can be in the olt built-in by OTDR, respectively can be as shown in Figures 2 and 3, Fig. 2 gives the system configuration schematic diagram of external OTDR in conjunction with the online fault detect of the FDD on each branch optical fiber, the initial trunk optical fiber of OLT connects multiple branch optical fiber by optical splitter splitter, be connected with ONU at each branch optical fiber end, each branch optical fiber be provided with the FDD be made up of the equidistant reflecting surface of two or more; OTDR in Fig. 3 is in the olt built-in.
State on the invention in embodiment, the spacing L between upper two reflectings surface of FDD of each branch optical fiber
1, L
2, L
3... L
nunequal, and it can be further set for non-integer multiple, can be such as 3m, 5m, 7m respectively, also can be 0.3m, 0.5m, 0.7m.Minimum spacing between reflecting surface depends on the resolution of OTDR.
Corresponding to above-mentioned fiber optic network embodiment, present invention also offers a kind of fault detection method, Fig. 4 is the schematic flow sheet of branch optical fiber fault detection method embodiment in fiber optic network of the present invention, as shown in Figure 4, comprises the steps:
Step 101, be time cycle branch optical fiber to be tested transmission fault test pulse signal in fiber optic network with what preset;
Wherein, described fiber optic network can comprise plural branch optical fiber, if when the number that each branch optical fiber comprises plural reflecting surface reflecting surface is more than three, the spacing between reflecting surface is equal, and spacing on different branch optical fiber between reflecting surface is unequal.
Step 102, detect and whether receive as the cycle is the reflection peak of 1/2 preset time period; Wherein said reflection peak is that the transmit superposition of periodic fault test pulse signal on the different reflectings surface of branch optical fiber generates.
If step 103 receives 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 the present embodiment provides, it is the detection method for the fiber optic network with plural branch optical fiber, and each branch optical fiber comprises plural reflecting surface, spacing on different branch optical fiber between reflecting surface is unequal, send fault test pulse signal with the time cycle of presetting to branch optical fiber to be tested, the above-mentioned default time cycle can be 2N × L
n/ V wherein N is positive integer and can gets N=1 in a particular embodiment, and V is the light velocity in described branch optical fiber of fault test pulse signal, L
nfor the spacing between two reflectings surface adjacent on fiber optic tap to be measured.After send above-mentioned fault test pulse signal to fiber optic network, be L for being provided with spacing in 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 for other branch optical fiber, then can not form described reflection peak.Therefore the present embodiment by sending the mode of test pulse with the different cycles, can be measured different branch optical fibers, realizes carrying out fault detect exactly to the branch optical fiber in fiber optic network respectively.
In addition, when the reflecting surface that branch optical fiber is arranged is the fractional transmission face of signal of communication wavelength, the fault test pulse signal with signal of communication with identical wavelength can be used.
Fig. 5 or Fig. 6 gives FDD in the specific embodiment of the invention and reflects superimposed curves schematic diagram, when concrete identification branch optical fiber fault, can by the OTDR be built in OLT, or the OTDR to be provided separately with OLT is by sending multiple pulses in certain hour cycle, the above-mentioned time cycle can with the spacing proportion relation of reflecting surface on each branch optical fiber, to make when the emission ratio of FDD first reflecting surface is less, do not need to consider the interreflection between each reflecting surface, OTDR can see the reflection peak of some cycles.
Such as, when Figure 5 shows that the fault of detection branches optical fiber 1, on this branch optical fiber FDD1 reflecting surface between spacing be 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, the part of its transmission reaches launches through the 2nd reflecting surface, when reflected signal arrives with first reflecting surface, 2nd pulse of OTDR also reaches the 1st reflecting surface and reflects, and above-mentioned two reflected signals superposition, has just become first reflection peak, by that analogy, the reflection peak that a string cycle is L1 can just be obtained.Simultaneously because the cycle is 2L
1the test pulse of/V is by the FDD in other cycles (namely spacing of reflecting plane is other values) in other branch optical fibers and by reflex time, because in the FDD of other branch optical fibers described, spacing of reflecting plane is not corresponding with above-mentioned test pulse, therefore can only individual reflection, front and back test pulse reflection peak superposition can not be formed, also just can not form L well
2, L
3... L
nin any one periodic reflection peak.
Equally as shown in Figure 6, in order to 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 sent the time cycle, and just can obtain a string cycle is L
2reflection peak.
Whether to break down the embodiment of testing as can be seen from above-mentioned to two branch optical fibers, OTDR can with 2L
n/ V sends a string test pulse the time cycle, can on detection branches optical fiber the FDD cycle be L
nbranch optical fiber whether have fault.OTDR sends the test pulse of different cycles at different time, and whether just can travel through the different branch optical fiber of the whole network of detection has fault.
Due to each FDD corresponding be a string periodic reflection peak, and the cycle is each unequal, and can be set it further and also do not become multiple proportion, even if so the distance of some FDD to OLT is the same, its the 1st reflection peak overlap, but reflection peak can not be overlapping thereafter.Certain one-level reflection peak in addition for certain FDD is just overlapping with certain one-level reflection peak of other certain FDD, and before and after overlapping, other reflection peak also can not be overlapping, namely cannot form periodic reflection peak.
In addition, the size of reflection peak at different levels is relevant with the reflection coefficient of two reflectings surface, do not consider two-stage reflection between decay and two-stage reflecting surface between interreflection (reflection coefficient is smaller), suppose that first reflection coefficient is 0.1, transmission coefficient is 0.9, second reflective surface coefficient is 0.1 is example, then the 1st grade is reflected into 0.1 (getting relative size), 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 the multiple reflections between two reflectings surface, then what reflection peak can be higher below, certain reflection and transmission coefficients also can be designed as other values.When testing the test wavelength used and being the same with communication wavelengths, reflection coefficient can design less, allows most of luminous power transmission, thus the impact of minimizing on proper communication Line Attenuation.
The embodiment of the present invention additionally provides branch optical fiber failure detector in a kind of fiber optic network, this device can perform the process step of above-mentioned detection method embodiment, Fig. 7 is the structural representation of branch optical fiber failure detector embodiment in 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 for sending fault test pulse signal with the time cycle of presetting 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 when the number of reflecting surface is more than three, spacing between reflecting surface is equal, and spacing on different branch optical fiber between reflecting surface is unequal, whether detection module 12 receives for detecting the reflection peak that the cycle 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 the present embodiment provides, it is the detection method for the fiber optic network with plural branch optical fiber, and each branch optical fiber comprises plural reflecting surface, spacing on different branch optical fiber between reflecting surface is unequal, send fault test pulse signal with the time cycle of presetting to branch optical fiber to be tested, the above-mentioned default time cycle can be 2N × L
n/ V wherein N is positive integer and can gets N=1 in a particular embodiment, and V is the light velocity in described branch optical fiber of fault test pulse signal, L
nfor the spacing between two reflectings surface adjacent on fiber optic tap to be measured.After send above-mentioned fault test pulse signal to fiber optic network, be L for being provided with spacing in 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 for other branch optical fiber, then can not form described reflection peak.Therefore the present embodiment by sending the mode of test pulse with the different cycles, can be measured different branch optical fibers, realizes carrying out fault detect exactly to the branch optical fiber in fiber optic network respectively.
When fault test being carried out to whole fiber optic network in specific implementation process, steps flow chart as described in Figure 8 can be comprised:
Step 201, FDD lay, and need the point of boundary carries out laying of FDD at different branch optical fibers.This separation can be the separation of indoor section in Optical Fiber Subscriber Access Network and outdoor section, and the optical fiber of above-mentioned indoor section is responsible for by user, and the optical fiber of outdoor section is responsible for by provider customer, therefore needs to demarcate to it.When reflection peak can be received, illustrate by the branch optical fiber fault-free between OLT to FDD.This step is the FDD laying different cycles at different branch optical fiber, and the cycle that such as lays on branch optical fiber 1 is L
1(spacing namely between reflecting surface is L
1) FDD, the cycle that branch optical fiber 2 lays is L
2(spacing namely between reflecting surface is L
2) FDD;
Step 202, FDD and branch optical fiber or ONU to be bound, namely in management system, the FDD of different cycles and corresponding branch optical fiber or ONU are bound, to make its one_to_one corresponding, and sets up corresponding mapping table further.
Step 203, OTDR send test massage and to test the n-th branch optical fiber, i.e. whether the part between OLT and the FDDn of test branch optical fiber has fault.Wherein the initial value of n can be set to 1, adds up successively, such as, be L 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 reflected, and gather reflection peak information;
Step 205, on the basis of above-mentioned steps 204, analyze whether receive corresponding reflection peak, to judge whether branch optical fiber has fault.If it is L that such as OTDR receives the cycle
1reflection peak, then illustrate on branch optical fiber 1 by fault-free between OLT to FDDn, if OTDR does not receive reflection peak, can confirm there is fault by between OLT to FDDn on branch optical fiber 1, above-mentioned reflection peak is that the transmit superposition of test pulse on the neighboring reflection face 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 between each branch optical fiber of whole system FDD and OLT, whether fault judges.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 the fiber optic network that the above embodiment of the present invention provides and fiber optic network, optical fiber is arranged and comprises at least two, the FDD of the reflecting surface of equidistant distribution, spacing between the reflecting surface of wherein each FDD is unequal or be non-integer multiple, and in fiber optic network, use each branch optical fiber of above-mentioned FDD to send fault test pulse signal with cycle predetermined time, the branch optical fiber only with corresponding spacing of reflecting plane can reflect to form reflection peak, then reflection peak can not be formed for the branch optical fiber with other spacing of reflecting plane.Thus, the embodiment of the present invention can realize carrying out fault detect accurately to branch optical fiber in fiber optic network.
Such scheme is utilized to carry out branch optical fiber breakdown judge in addition, when FDD lays, without the distance between each FDD and OLT of DCO, do not need to stagger their distance yet, only needing to record what which root branch optical fiber laid is the FDD in which kind of cycle, the FDD of different cycles is associated with branch optical fiber, even if make the network between OTL and FDD occur adjustment, does not also affect the incidence relation of FDD and branch optical fiber.Therefore, adopt the scheme of the embodiment of the present invention not only can improve branch optical fiber fault in fiber optic network and accurately detect, and can improve in network operation maintenance process and demarcations efficiency is carried out for fault, reduction operator maintenance cost.
The fiber optic network that the above embodiment of the present invention provides, with branch optical fiber fault detection method in fiber optic network, also can be applied in TDM PON or WDM PON system, can be used for identifying different branch optical fibers, also can be used for demarcating to fiber failure.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a branch optical fiber fault detection method in fiber optic network, is characterized in that, comprising:
Fault test pulse signal is sent with the branch optical fiber that the time cycle of presetting is to be tested in fiber optic network, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, and the spacing on different branch optical fiber between reflecting surface is non-integer multiple; Wherein, each branch optical fiber comprises multiple reflecting surface, and spacing between described multiple reflecting surface is equal; The described default time cycle is 2L
nthe integral multiple of/V, wherein L
nfor the spacing between two reflectings surface adjacent on fiber optic tap to be tested, V is the light velocity in described branch optical fiber of fault test pulse signal;
Detecting and whether receiving the cycle is L
nreflection peak;
If receive described reflection peak, then confirm branch optical fiber fault-free to be tested, if do not receive described reflection peak, then confirm that branch optical fiber to be tested breaks down.
2. branch optical fiber fault detection method in fiber optic network according to claim 1, is characterized in that, described reflection peak is the signal that the reflected signal superposition of periodic fault test pulse signal on the different reflectings surface of branch optical fiber generates.
3. branch optical fiber fault detection method in fiber optic network according to claim 1, is characterized in that, described fault test pulse signal has identical wavelength with signal of communication.
4. a branch optical fiber failure detector in fiber optic network, is characterized in that, comprising:
Transmitter module, for sending fault test pulse signal with the time cycle of presetting to fiber optic network to be tested, described fiber optic network comprises plural branch optical fiber, each branch optical fiber comprises plural reflecting surface, and the spacing on different branch optical fiber between reflecting surface is non-integer multiple; Wherein, each branch optical fiber comprises multiple reflecting surface, and spacing between described multiple reflecting surface is equal; The described default time cycle is 2L
nthe integral multiple of/V, wherein L
nfor the spacing between two reflectings surface adjacent on fiber optic tap to be tested, V is the light velocity in described branch optical fiber of fault test pulse signal;
Detection module, whether receiving the cycle for detection is L
nreflection peak, 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.
5. in the fiber optic network according to any one of claim 4, branch optical fiber failure detector, is characterized in that, described reflection peak is the signal that the reflected signal superposition of periodic fault test pulse signal on the different reflectings surface of branch optical fiber generates.
6. a fiber optic network, the plural branch optical fiber comprising fiber optic network node and be connected with this fiber optic network node, it is characterized in that, each branch optical fiber includes plural reflecting surface, and the spacing on different branch optical fiber between reflecting surface is non-integer multiple; Described fiber optic network also comprises optical time domain reflectometer, and described optical time domain reflectometer is used for sending fault test pulse signal with the branch optical fiber that the time cycle of presetting is to be tested in described fiber optic network, and the described default time cycle is 2L
nthe integral multiple of/V, wherein L
nfor the spacing between two reflectings surface adjacent on fiber optic tap to be tested, V is the light velocity in described branch optical fiber of fault test pulse signal; Detecting and whether receiving the cycle is L
nreflection peak; If receive described reflection peak, then confirm branch optical fiber fault-free to be tested, if do not receive described reflection peak, then confirm that branch optical fiber to be tested breaks down.
7. fiber optic network according to claim 6, is characterized in that, the reflecting surface that each branch optical fiber comprises is at least three, and spacing between neighboring reflection face is equal.
8. fiber optic network according to claim 6, is characterized in that, described reflecting surface is the reflecting surface of Fiber Bragg Grating FBG or filter.
9. the fiber optic network according to any one of claim 6-8, is characterized in that, described fiber optic network node is optical line terminal, and described optical time domain reflectometer and optical line terminal are arranged respectively, or described optical time domain reflectometer is built in optical line terminal.
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| CN102111686B (en) * | 2009-12-25 | 2014-01-01 | 华为技术有限公司 | Method, device and system for detecting faults of branch optical fibers |
| CN102118658B (en) * | 2009-12-31 | 2014-02-19 | 华为技术有限公司 | Method and device for port identification of light splitter |
| CN103427898B (en) * | 2012-05-25 | 2017-02-08 | 中兴通讯股份有限公司 | Method and system for determining branch fault point of passive optical network |
| CN104426603A (en) | 2013-08-30 | 2015-03-18 | 华为技术有限公司 | Optical network detection method, optical network detection device, optical network detection equipment, optical network detection system and optical splitter |
| CN104202084B (en) * | 2014-09-30 | 2016-06-29 | 太原理工大学 | A kind of device and method monitoring TDM optical network link failure |
| CN104579460A (en) * | 2014-12-15 | 2015-04-29 | 国家电网公司 | Centralized measurement method of FTTx passive optical network |
| CN107852236A (en) * | 2015-06-16 | 2018-03-27 | 昇宰股份公司 | Optical link monitoring system |
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| CN1866790A (en) * | 2005-11-16 | 2006-11-22 | 华为技术有限公司 | PON network design method using OTDR detection light path |
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