CN102244541A - Detection method, system and device for P2MP (point to multi-point) optical network - Google Patents
Detection method, system and device for P2MP (point to multi-point) optical network Download PDFInfo
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Abstract
The embodiment of the invention provides a detection method, system and device for a P2MP (point to multi-point) optical network. The method comprises the following steps: extracting a test signal transmitted by local side test equipment from a branch optical fiber; generating a feedback signal, which is the same as the test signal in wavelength and is higher than the test signal in strength, according to the extracted test signal; and feeding back the feedback signal to the local side test equipment so that the local side test equipment can detect the channel characteristics of the branch optical fiber according to the feedback signal. In the embodiment of the invention, performance requirement for the local side test equipment is reduced, thereby improving the event identification capability of the branch optical fiber and reducing the operation and maintenance cost of the system.
Description
Technical field
The present invention relates to networking technology area, relate in particular to detection method, system and the equipment of a kind of point to the multiple spot fiber optic network.
Background technology
Generally, PON (Passive Optical Network, EPON) technology is a kind of P2MP (Point To Multi Point, point is to multiple spot) the fiber optic network access technology, it is by CO (CentralOffice, local side) OLT (Optical Line Terminal, optical line terminal), the ONU of user side (Optical Network Unit, optical network unit) or ONT (Optical Network Terminal, Optical Network Terminal) and ODN (Optical Distribution Network, Optical Distribution Network) form.
OLT connects one or more ODN for the PON system provides the network side interface.ODN is the passive optical splitters part, is used to connect OLT equipment and ONU/T equipment, be used to distribute or multiplexing OLT and ONU/T between data-signal.ONU provides user side interface for the PON system, links to each other with ODN.If ONU directly provides User Port Function, the ethernet user's port as PC online usefulness then is called ONT.No specified otherwise, the ONU that hereinafter mentions system refers to ONU and ONT.
In the PON system, from OLT to ONU, be called descendingly, adopt the wavelength of 1490nm, by OLT according to TDM (Time Division Multiplexing, time division multiplexing) mode is broadcast to all ONU with downstream data flow, and each ONU receives only the data that have self identification.Otherwise, be up from ONU to OLT, adopt the wavelength of 1310nm.Because each ONU shares ODN and OLT equipment, for the upstream data that guarantees each ONU does not clash, the PON system adopts TDMA (Time DivisionMultiple Access, time division multiple access) mode, promptly distribute time slot by OLT for each ONU, each ONU must send data in strict accordance with the OLT distributed time slot.
Optical time domain reflectometer (OTDR, Optical Time Domain Reflectometer) be a kind of instrument of measuring optical fiber characteristic, can assess the characteristic of simple optical fiber or complete link by OTDR, the laser of OTDR is launched a test signal in tested optical fiber, test signal can be owing to characteristic (medium is inhomogeneous) the formation backscatter signal of optical fiber itself or because the connector on the optical fiber link when Optical Fiber Transmission, breakaway poing, optical fiber tail ends etc. form reflected signal, the detector of OTDR detects the intensity of backscatter signal or reflected signal and the time of arrival, calculates the line characteristic that obtains along the fiber lengths distribution.Catastrophe point on the OTDR curve is referred to as case point (or incident), and saying of decay incident (also can be referred to as the loss incident), reflection event arranged.Bending on the general fibre circuit, welding point etc. present with the decay incident on the OTDR curve, and the tie point of connector, fibercuts point, optical fiber tail end etc. present with reflection event on the OTDR curve.By accurate event type and the position on the positioning optical waveguides circuit of OTDR.
But when OTDR is applied in the PON system, because the PON system point is to the feature of multiple spot, make and adopt OTDR to have following problem when the CO end is tested the PON circuit: optical splitter (Splitter) is introduced very big loss, in addition, test signal is affected at the reflectivity of each branch optical fiber, described OTDR is the fault on the detection branches optical fiber effectively, and is therefore should existing scheme higher to the performance requirement of office testing device.Adopt the scheme that should have now, if will improve branch optical fiber Identification of events ability, must improve the performance of office testing device, this will cause system's O﹠M cost higher.
Summary of the invention
The embodiment of the invention provides detection method, system and the equipment of a kind of point to the multiple spot fiber optic network, to solve problems of the prior art.
The embodiment of the invention at first provides the detection system of a kind of point to the multiple spot fiber optic network, comprise: trunk optical fiber, optical splitter and a plurality of branch optical fiber, wherein said trunk optical fiber is connected to described a plurality of branch optical fiber by described optical splitter, and described trunk fiber couples has testing equipment, and each branch optical fiber is respectively arranged with the pip of band gain function; The pip of described band gain function is used for test signal that described testing equipment is sent and extracts from the branch optical fiber of correspondence, and according to the described test signal of extracting, generate and signal strength signal intensity identical feedback signal, and described feedback signal is returned to described testing equipment greater than the described test signal of extracting with the described test signal wavelength that extracts; Described testing equipment is used to provide described test signal, and receives described feedback signal, detects the characteristic of channel of described branch optical fiber according to described feedback signal.
The embodiment of the invention also provides the detection method of a kind of point to the multiple spot fiber optic network, comprising: the test signal that office testing device is sent extracts from branch optical fiber; According to the test signal of extracting, generate the feedback signal of wavelength and signal strength signal intensity identical greater than described test signal with described test signal; Described feedback signal is returned to described office testing device, so that described office testing device detects the characteristic of channel of described branch optical fiber according to described feedback signal.
The embodiment of the invention also provides a kind of fiber optic network checkout gear, comprising: extraction module is used for the test signal that office testing device sends is extracted from branch optical fiber; The gain reflecting module is used for according to the test signal extracted, generates the feedback signal of wavelength and signal strength signal intensity identical with described test signal greater than described test signal; Sending module is used for described feedback signal is returned to described office testing device, so that described office testing device detects the characteristic of channel of described branch optical fiber according to described feedback signal.
Technique scheme has following beneficial effect: because the pip of band gain function is set on the branch optical fiber of putting the multiple spot fiber optic network, described pip can provide and feedback signal identical from the test signal wavelength of office testing device and that light signal strengthens, feed back to above-mentioned office testing device so that it detects the characteristic of channel of described branch optical fiber, reduce the performance requirement of office testing device thus, thereby improve branch optical fiber Identification of events ability, reduce system's O﹠M cost.
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 to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only 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 a PON system configuration schematic diagram;
Fig. 2 is that a kind of point of the embodiment of the invention is to multiple spot fiber optic network detection method flow chart;
Fig. 3 is the system configuration schematic diagram of embodiment of the invention band DPRA;
Fig. 4 is the specific implementation structure chart of a kind of DPRA of the embodiment of the invention;
Fig. 5 is the specific implementation structure chart of the another kind of DPRA of the embodiment of the invention;
Fig. 6 is the specific implementation structure chart of another DPRA of the embodiment of the invention;
Fig. 7 is that a kind of point of the embodiment of the invention is to multiple spot fiber optic network checkout gear structural representation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only 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.
In the operation and maintenance process of FTTx (Fiber-To-The-x, optical fiber inserts), ODN, FTTx equipment is responsible for maintenance with resource by different responsible partys, and different faults has different handling processes.As shown in Figure 1, be PON system configuration schematic diagram, for example OLT safeguards by different responsible partys with ODN and is responsible for, and Drop cable has different responsibility of maintenance main bodys with outdoor optical fiber, and the indoor fiber failure of user needs subscriber to repair.If can distinguish to different responsibility interfaces, then can reduce the O﹠M cost of operator, increase customer satisfaction degree.Particularly to branch optical fiber, because two technical problems that aforesaid CO side optical fibers line test exists make that responsibility differentiation and the fault fix duty (defining of responsibility) on the branch optical fiber has higher value to reducing O﹠M cost and increasing customer satisfaction degree.
For head it off, as shown in Figure 2, be the flow chart of a kind of point of the embodiment of the invention to multiple spot fiber optic network detection method, described method comprises:
In one embodiment, described step 202 can comprise: will be separated from the control signal and the described test signal of local side, and described test signal is offered the injection locking light source; Described control signal is converted to the signal of telecommunication, and offers the bias current of described injection locking light source according to described signal of telecommunication control; Utilizing described bias current to control described injection locking light source, to generate wavelength identical with described test signal and have a feedback signal with the corresponding signal strength signal intensity of described bias current.
Wherein, the wavelength of described control signal and described test signal can be for identical, and the step that will be separated from the control signal and the described test signal of local side can comprise: will be divided into two parts from the downlink optical signal that described branch optical fiber extracts, wherein a part is as described control signal, and another part is as described test signal; Perhaps, described control signal can be for different with the wavelength of described test signal, and will comprise with the step that described test signal is separated: will extract downstream signal from described branch optical fiber according to wavelength different and carry out wavelength (de) multiplexing respectively, so that described control signal and described test signal are separated from the control signal of local side.
Alternately, in another kind of embodiment, described step 202 can comprise: described test signal is offered the injection locking light source; Reception is from the control signal of user side communication equipment, and offers the bias current of described injection locking light source according to described control signal control; Utilizing described bias current to control described injection locking light source, to generate wavelength identical with described test signal and have a feedback signal with the corresponding signal strength signal intensity of described bias current.
In another alternate embodiment, described step 202 can comprise: described test signal is reflected to generate the wavelength reflected signal identical with described test signal, and described reflected signal is carried out processing and amplifying, and the reflected signal after the wherein said amplification is as described feedback signal; Perhaps, described test signal is amplified, and the test signal after amplifying is reflected, wherein the signal of reflection back generation is as described feedback signal.
The embodiment of the invention considers it is the pip DPRA (Demarcation Point Reflective Amplifier has the separation of enlarging function) that inserts a band gain function on the different responsible party's separations safeguarded of FTTx fibre circuit.Above-mentioned office testing device comprises optical time domain reflectometer OTDR.As shown in Figure 3, be the system configuration schematic diagram of embodiment of the invention band DPRA.
As shown in Figure 3, the embodiment of the invention also provides the detection system of a kind of point to the multiple spot fiber optic network, comprise: trunk optical fiber, optical splitter and a plurality of branch optical fiber, wherein said trunk optical fiber is connected to described a plurality of branch optical fiber by described optical splitter, and described trunk fiber couples has testing equipment, and each branch optical fiber is respectively arranged with DPRA; Wherein said DPRA is used for test signal that described testing equipment is sent and extracts from the branch optical fiber of correspondence, and according to the described test signal of extracting, generate and signal strength signal intensity identical feedback signal, and described feedback signal is returned to described testing equipment greater than the described test signal of extracting with the described test signal wavelength that extracts; Described testing equipment is used to provide described test signal, and receives described feedback signal, detects the characteristic of channel of described branch optical fiber according to described feedback signal.
See also Fig. 4-Fig. 6, in specific embodiment, described DPRA comprises coupler and reflection amplifier, wherein said reflection amplifier is coupled to described branch optical fiber by described coupler, described coupler is used for described reflection amplifier is separated and offered to test signal from the downstream signal of described branch optical fiber transmission, described reflection amplifier is used to generate and signal strength signal intensity identical with the described test signal wavelength feedback signal greater than described test signal, and described feedback signal is returned to described testing equipment.
In one embodiment, described reflection amplifier can comprise: light separator, photoelectric conversion unit, Optical Amplifier Unit and control unit, described light separator will from the control signal of local side and test signal be separated and offer described photoelectric conversion unit and Optical Amplifier Unit respectively, described photoelectric conversion unit is used for described control signal and is converted to the signal of telecommunication and offers described control unit, described control unit is used for offering according to the described signal of telecommunication control bias current of described Optical Amplifier Unit, described Optical Amplifier Unit is used for the test signal that receives according to it, generates the feedback signal of respective signal intensity under the control of described bias current.
Wherein, described control signal is identical with the test signal wavelength, and described light separator extracts described coupler from described branch optical fiber light signal separated into two parts, wherein a part is as described control signal and offer described photoelectric conversion unit, and another part is as described test signal and offer described Optical Amplifier Unit; Perhaps, described control signal is different with the test signal wavelength, and described light separator carries out demultiplexing with described coupler from the light signal that described branch optical fiber extracts according to the difference of wavelength, and control signal and the test signal that demultiplexing obtains offered described photoelectric conversion unit and described Optical Amplifier Unit respectively.
In another kind of embodiment, described DPRA can be arranged on user side communication equipment inside, and described reflection amplifier comprises Optical Amplifier Unit and control unit, wherein said control unit is used to receive the control signal that described user side communication equipment provides, control offers the bias current of described Optical Amplifier Unit, described Optical Amplifier Unit is used for the test signal that receives according to it, generates the feedback signal of respective signal intensity under the control of described bias current.
Particularly, described Optical Amplifier Unit comprises the injection locking light source, it can receive the wavelength of test signal according to it, its emission wavelength is locked as identical, and sends to described testing equipment and to have described wavelength and luminous intensity feedback signal greater than described test signal with the wavelength of described test signal.
In another kind of alternate embodiment, described Optical Amplifier Unit comprises semiconductor optical amplifier and reflector element, and described semiconductor optical amplifier and reflector element are used for test signal is reflected and reflected signal is amplified to generate described feedback signal; Perhaps, be used for test signal is amplified and the test signal after amplifying is reflected, and reflected signal is as described feedback signal.
By the DPRA on each branch optical fiber of putting the multiple spot fiber optic network test signal reflection from the CO side is amplified, such as, test signal is carried out light-electrical-optical regeneration passback, thereby increase the reflectivity of separation, make the OTDR of CO side can detect the reflected signal at DPRA place easily.When using OTDR that optical fiber is tested, the ability of the reflected signal that OTDR can detect depends on the relative altitude of the relative backscatter signal of reflection event on the OTDR test curve, relative altitude is high more, easy more detection (identification) reflection event, relative altitude is mainly relevant by the intensity of the reflectivity of reflection event and backscatter signal, then the intensity to scattered signal is mainly determined by pulse duration in point-to-point fiber optic network, but in putting the PON network of multiple spot, because the backscatter signal of a plurality of branches can superpose, the intensity of backscatter signal is not only relevant with the test signal pulses width, also is inversely proportional to branches.Relative altitude can be with following formulate:
Wherein, H is the height of reflection peak, and unit is dB;
Bns is the backscattering coefficient of 1nS pulse duration, generally gets-80dB;
R is the reflectivity of reflection event, and unit is dB. (the general unsettled reflectivity of PC connector is about a 14dB);
N be branches (general N=1,2,4,8,16,32,64 ...);
T is pulse duration (ns).
Because the influence of factors such as noise, OTDR can only detect the reflection event (for example reflection event of the height＞0.1dB of the relative back scattering incident of reflection event) above certain relative altitude, promptly require the H＞=0.1dB in the following formula, the minimal reflection incident that can detect just is inversely proportional to pulse width T.During test, generally selected T.Under T one stable condition, can only the detection of reflected rate more than or equal to the reflection event of certain value (x dB), to the reflection event of reflectivity, can not detect less than x dB.If adopt the reflection event of band gain, method promptly provided by the invention promptly can improve the reflectivity at DPRA place, and reflectivity promptly makes OTDR can be easy to detect the reflection event at DPRA place after increasing, and reduces the performance requirement of OTDR.
At FTTH (Fiber-To-The-Home, Fiber to the home) under the scene, be that ONU is deployed in user's family, connect the access terminal box (ATB of the branch optical fiber of optical splitter at user side, Access TerminalBox) is terminated (supply socket that the similar user of the box that accesses terminal is indoor), realizes being connected of terminal box and ONU by jumping fiber.This situation can be placed into DPRA in the box that accesses terminal.When the CO side was tested fibre circuit, if optical splitter is normal to the optical fiber of DPRA, then DPRA can amplify reflection or light-electrical-optical regeneration passback to the test light signal, strengthens the reflectivity of the connector of the box that accesses terminal; If optical splitter breaks down to the optical fiber of DPRA, for example ruptured, then the CO side can not receive the reflected light signal of the connector of the box that accesses terminal.When active maintenance judges that branch optical fiber breaks down or the user reports the barrier back to diagnose branch optical fiber to go wrong, can be by whether from the light signal of the reflection that detects DPRA of CO side, can judge, fault is at (between optical splitter and the DPRA) before the DPRA or after DPRA (box that accesses terminal is to ONU). because DPRA can be in the strong reflection of box-like pairwise testing signal that accesses terminal, can reduce the performance requirement of CO side test equipment, improve test performance.For example, when DPRA to test signal have 10 * lg32～=15dB when gain, then can offset under 1: 32 splitting ratio scene, 32 branch's backscatter signal superpose to the influence of reflected signal, can detect littler reflected signal or can not adopt high performance testing equipment can detect the reflection event with identical reflectivity.
Optionally, above-mentioned before receiving the test signal of office testing device transmission on the branch optical fiber of putting the multiple spot fiber optic network, said method can also comprise: receive control signal above-mentioned to the branch optical fiber of multiple spot fiber optic network; Open optical amplification function according to above-mentioned control signal.Above-mentioned according to behind the above-mentioned control signal unlatching optical amplification function, the test signal that can send the office testing device that receives in test period is carried out light amplification.Above-mentionedly to the branch optical fiber of multiple spot fiber optic network, receive control signal, can comprise: in the above-mentioned control signal of representing with pulse duration that receives that above-mentioned office testing device sends to the branch optical fiber of multiple spot fiber optic network above-mentioned; Perhaps above-mentioned receive that above-mentioned office testing device sends to the branch optical fiber of multiple spot fiber optic network with an independent control signal that wavelength is represented; Perhaps to the branch optical fiber of multiple spot fiber optic network, receive the control signal that network unit/optical network terminal sends above-mentioned.Describe in detail below in conjunction with instantiation:
As shown in Figure 4, be the specific implementation structure chart of a kind of DPRA of the embodiment of the invention, comprise first optical fiber interface 410 and second optical fiber interface 411, coupler 401 and reflection amplifier 402.When DPRA is placed in the box that accesses terminal, connect the port of first optical fiber interface 410 and optical splitter by branch optical fiber; In addition, second optical fiber interface 411 is terminated at the box that accesses terminal, and second optical fiber interface 4 youngsters can be connected with ONU by the optical fiber jumping fiber.Wherein, coupler 401 is used for the test light signal is separated from downstream signal, and the test light signal and the upstream data light signal of passback is coupled in the branch optical fiber, can use wavelength division multiplexer (WDM) to realize.By the centrifugation of coupler 401, in the downstream signal of first optical fiber interface, 410 outputs, the downlink data wavelength is admitted to different passages by demultiplexing respectively with the test wavelength.Wherein, the downlink data wavelength is sent to second optical fiber interface 411, and further by the ONU of user's Optical Fiber Transmission to correspondence.Test wavelength X 1 is separated the back through coupler 401 and is arrived reflection amplifier 402.
Described photoelectric conversion unit 404 can adopt PD (Photodiode, photodetector), and it can detect input optical signal, and this light signal is converted to the corresponding signal of telecommunication and offers described control unit 406.
Described Optical Amplifier Unit 405 can be selected the injection locking light source, such as FP-LD (Fabry-Perot laser
The diode fabry-Perot type laser).After providing bias current for FP-LD, if input optical signal is arranged, then described FP-LD can the output wavelength light signal consistent with input optical signal, can control the intensity of the light signal of described FP-LD output by the bias current of control FP-LD, thereby realize the reflection that the light signal of importing carries out is in various degree amplified.Signal after the amplification is delivered to again in the optical fiber through light separator 403 and coupler 401, and tested Equipment Inspection is arrived, and is used for the state of detection line.Alternative, described Optical Amplifier Unit 405 also can be selected SOA (optical semiconductor is put) or other optical amplifier spares.
Because the fibre circuit test is generally started by Event triggered (user reports barrier) or cycle, the time ratio that test needs is shorter, and most of the time DPRA is in idle condition.Need within a certain period of time could obtain test result through repeatedly testing, for example OTDR test generally obtains test curves through 10000 tests in 30S.When far supplying, need reduce the energy consumption of DPRA as much as possible, can realize by following testing process when DPRA employing powered battery or by light signal.
DPRA is operated in low-power consumption mode generally speaking, and the low-power consumption mode optical amplification function is not worked.In the time will testing circuit, the testing equipment of CO end such as OTDR, sends a control signal to DPRA, and this control signal triggers DPRA and carries out mode of operation from low-power consumption mode.In mode of operation, the control unit 406 in the reflection amplifier 402 begins control powers to Optical Amplifier Unit 405, makes Optical Amplifier Unit 405 begin to enter operating state.In working order, 406 pairs of test light signals of Optical Amplifier Unit reflect amplification.
In specific embodiment, such as, OTDR sends a control signal, and this control signal is coupled device 401 and is separated to this reflection amplifier 402.In this reflection amplifier 402, photoelectric conversion unit 404 converts thereof into the corresponding signal of telecommunication, and control unit 406 is resolved the photoelectric conversion unit 404 output signals of telecommunication, is control signal if judge it, then starts a test period T1.In test period, 406 pairs of Optical Amplifier Units 405 of control unit power on, and enter operating state to start Optical Amplifier Unit 405.With FP-LD is example, in test period FP-LD is powered on, and the bias current of FP-LD is set, and before T1 expires, if control unit 406 is not received control signal again, then closes FP-LD.Wherein should can set in advance in control unit 406 by test period T1.In a test period T1, OTDR can send the test light signal and test.If OTDR can't obtain desirable test result (curve) in a test period T1, then can repeat to transmit control signal, allow control unit 406 restart a test period, obtain test result according to the data in a plurality of cycles at last.After the normal bias, if the injection light signal is arranged, then FP-LD can send and inject the light signal that wavelength of optical signal is consistent and luminous intensity is exaggerated because FP-LD has powered on, and promptly is equivalent to the injection light signal is reflected amplification or light-electrical-optical regeneration passback.Wherein, the intensity of the light signal that FP-LD sends is relevant with the bias current size of the intensity of injecting light signal and FP-LD laser, and in the working range of FP-LD laser, the light signal that injects the strong more then emission of signal strength signal intensity is strong more, bias current is big more, and the light signal of emission is big more.The light signal reverse transfer of exporting after the injection locking, and receive to be detected by OTDR, the signal of output is strong more, is detected by OTDR easily more.By the bias current size of control FP-LD, the i.e. size of the reflectivity at may command DPRA place.
Further, control mode can be controlled by pulse duration, for example: when pulse duration during greater than 100uS, then start a test period.Also can adopt other modes to realize, for example: when only detecting set specific frequency signal, DPRA just starts a test period.Promptly can adopt identical mode to control in each branch, also can control in different ways.For example, if all adopting pulse duration controls, can start DPRA in all branches by a control signal, for example the control signal when all branches all be made as＞during the optical signal pulses of 100uS, then after OTDR sends the light pulse of one＞100uS, DPRA in all branches begins to start Optical Amplifier Unit 405, keeps power supply and control to Optical Amplifier Unit 405 in a test period.Also can each branch control separately, for example: first branch can control with 100～150uS pulse, and second branch can control with the pulse duration of 150～200uS.
As shown in Figure 5, be the specific implementation structure chart of the another kind of DPRA of the embodiment of the invention.Control by the reflection amplifier 402 among 2 couples of DPRA of an independent wavelength X in the present embodiment, for example utilize λ 1=1650nm to carry out line test, utilize λ 2=1625 to control.In this manner, light separator 403 can be wavelength division multiplexer WDM, and coupler 401 and light separator 403 can unite two into one, and the two is integrated a wavelength division multiplexer and realizes.Because adopt independent wavelength to control, control can be more flexible.Such as, in the non-testing time, control DPRA is operated in low-power consumption mode, FP-LD 405 is not powered.Control unit 406 is after receiving control signal, controlled function is opened a test period, FP-LD 405 is powered on, and FP-LD 405 (for example: the bias current that FP-LD is set) carried out control corresponding, after test period finishes, turn-off the power supply of FP-LD 405, reenter low-power consumption mode.
As shown in Figure 6, specific implementation structure chart for another DPRA of the embodiment of the invention, when DPRA is integrated into the ONU device interior, the opening and closing of OAM (operation maintenance management) commands for controlling optical amplification function that can be by data channel, thus realize the reflection of test light signal is amplified.Receive OAM control enabling signal, ONU transmits control signal to control unit 406, by the unlatching of control unit 406 control FP-LD 405, close, the setting of parameter (for example: the setting of FP-LD biasing circuit size.
In this manner, as shown in Figure 6.Reflection amplifier 402 comprises optical amplification function 405 (such as FP-LD) and controlled function 406.Because control signal is directly to be sent by ONU, so present embodiment is compared to above-mentioned other embodiment, and light separator and photoelectric conversion unit can be saved in these reflection amplifier 402 inside.
The embodiment of the invention mainly is the test signal that sends by near reception office testing device on the branch optical fiber of ONU end, realization is amplified the reflection of test signal, equivalence increases the reflectivity of separation, improve the height of reflection event, thereby realize reducing the performance requirement of CO end testing equipment or function (for example OTDR), reduce O﹠M cost and improve branch optical fiber Identification of events ability.
Corresponding to said method embodiment, as shown in Figure 7, for a kind of point of the embodiment of the invention to multiple spot fiber optic network checkout gear structural representation, described device comprises:
Gain reflecting module 702 is used for according to the test signal extracted, generates the feedback signal of wavelength and signal strength signal intensity identical with described test signal greater than described test signal;
Sending module 703 is used for described feedback signal is returned to described office testing device, so that described office testing device detects the characteristic of channel of described branch optical fiber according to described feedback signal.
Particularly, the concrete structure of each unit or module and the course of work can repeat no more with reference to figure 4-6 and in conjunction with the corresponding description of previous embodiment herein in the embodiment of the invention.
Various embodiments of the invention are by being provided with the pip of band gain function on the branch optical fiber of putting the multiple spot fiber optic network, described pip can provide and feedback signal identical from the test signal wavelength of office testing device and that light signal strengthens, feed back to above-mentioned office testing device so that it detects the characteristic of channel of described branch optical fiber, reduce the performance requirement of office testing device thus, thereby improve branch optical fiber Identification of events ability, reduce system's O﹠M cost.One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct related hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise above-mentioned all or part of step, described storage medium, as: ROM/RAM, disk, CD etc.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a point is to the detection system of multiple spot fiber optic network, comprise: trunk optical fiber, optical splitter and a plurality of branch optical fiber, wherein said trunk optical fiber is connected to described a plurality of branch optical fiber by described optical splitter, and described trunk fiber couples has testing equipment, it is characterized in that: each branch optical fiber is respectively arranged with the pip of band gain function;
The pip of described band gain function is used for test signal that described testing equipment is sent and extracts from the branch optical fiber of correspondence, and according to the described test signal of extracting, generate and signal strength signal intensity identical feedback signal, and described feedback signal is returned to described testing equipment greater than the described test signal of extracting with the described test signal wavelength that extracts;
Described testing equipment is used to provide described test signal, and receives described feedback signal, detects the characteristic of channel of described branch optical fiber according to described feedback signal.
2. detection system as claimed in claim 1, it is characterized in that, the pip of described band gain function comprises coupler and reflection amplifier, wherein said reflection amplifier is coupled to described branch optical fiber by described coupler, described coupler is used for described reflection amplifier is separated and offered to test signal from the downstream signal of described branch optical fiber transmission, described reflection amplifier is used to generate and signal strength signal intensity identical with the described test signal wavelength feedback signal greater than described test signal, and described feedback signal is returned to described testing equipment.
3. detection system as claimed in claim 2, it is characterized in that, described reflection amplifier comprises: light separator, photoelectric conversion unit, Optical Amplifier Unit and control unit, described light separator will from the control signal of local side and test signal be separated and offer described photoelectric conversion unit and Optical Amplifier Unit respectively, described photoelectric conversion unit is used for described control signal and is converted to the signal of telecommunication and offers described control unit, described control unit is used for offering according to the described signal of telecommunication control bias current of described Optical Amplifier Unit, described Optical Amplifier Unit is used for the test signal that receives according to it, generates the feedback signal of respective signal intensity under the control of described bias current.
4. detection system as claimed in claim 3, it is characterized in that, described control signal is identical with the test signal wavelength, and described light separator extracts described coupler from described branch optical fiber light signal separated into two parts, wherein a part is as described control signal and offer described photoelectric conversion unit, and another part is as described test signal and offer described Optical Amplifier Unit.
5. detection system as claimed in claim 3, it is characterized in that, described control signal is different with the test signal wavelength, and described light separator carries out demultiplexing with described coupler from the light signal that described branch optical fiber extracts according to the difference of wavelength, and control signal and the test signal that demultiplexing obtains offered described photoelectric conversion unit and described Optical Amplifier Unit respectively.
6. detection system as claimed in claim 2, it is characterized in that, the pip of described band gain function is arranged on user side communication equipment inside, and described reflection amplifier comprises Optical Amplifier Unit and control unit, wherein said control unit is used to receive the control signal that described user side communication equipment provides, control offers the bias current of described Optical Amplifier Unit, described Optical Amplifier Unit is used for the test signal that receives according to it, generates the feedback signal of respective signal intensity under the control of described bias current.
7. as each described fiber optic network detection system in the claim 2 to 6, it is characterized in that, described Optical Amplifier Unit comprises the injection locking light source, it receives the wavelength of test signal according to it, its emission wavelength is locked as identical, and sends to described testing equipment and to have described wavelength and luminous intensity feedback signal greater than described test signal with the wavelength of described test signal.
8. as each described fiber optic network detection system in the claim 2 to 6, it is characterized in that, described Optical Amplifier Unit comprises semiconductor optical amplifier and reflector element, and described semiconductor optical amplifier and reflector element are used for test signal is reflected and reflected signal is amplified to generate described feedback signal; Perhaps, be used for test signal is amplified and the test signal after amplifying is reflected, and reflected signal is as described feedback signal.
9. a point is characterized in that to the detection method of multiple spot fiber optic network, comprising:
The test signal that office testing device is sent extracts from branch optical fiber;
According to the test signal of extracting, generate the feedback signal of wavelength and signal strength signal intensity identical greater than described test signal with described test signal;
Described feedback signal is returned to described office testing device, so that described office testing device detects the characteristic of channel of described branch optical fiber according to described feedback signal.
10. detection method as claimed in claim 9 is characterized in that, the test signal that described basis is extracted generates wavelength and signal strength signal intensity identical with described test signal and comprises greater than the step of the feedback signal of described test signal:
To be separated from the control signal and the described test signal of local side, and described test signal is offered the injection locking light source;
Described control signal is converted to the signal of telecommunication, and offers the bias current of described injection locking light source according to described signal of telecommunication control;
Utilizing described bias current to control described injection locking light source, to generate wavelength identical with described test signal and have a feedback signal with the corresponding signal strength signal intensity of described bias current.
11. detection method as claimed in claim 10, it is characterized in that, described control signal is identical with the wavelength of described test signal, wherein the step that will be separated from the control signal and the described test signal of local side comprises: will be divided into two parts from the downlink optical signal that described branch optical fiber extracts, wherein a part is as described control signal, and another part is as described test signal.
12. detection method as claimed in claim 10, it is characterized in that described control signal is different with the wavelength of described test signal, wherein will comprise with the step that described test signal is separated: will extract downstream signal from described branch optical fiber according to wavelength different and carry out wavelength (de) multiplexing respectively, so that described control signal and described test signal are separated from the control signal of local side.
13. the detection method shown in claim 9 is characterized in that, the test signal that described basis is extracted generates wavelength and signal strength signal intensity identical with described test signal and comprises greater than the step of the feedback signal of described test signal:
Described test signal is offered the injection locking light source;
Reception is from the control signal of user side communication equipment, and offers the bias current of described injection locking light source according to described control signal control;
Utilizing described bias current to control described injection locking light source, to generate wavelength identical with described test signal and have a feedback signal with the corresponding signal strength signal intensity of described bias current.
14. the detection method shown in claim 9 is characterized in that, the test signal that described basis is extracted generates wavelength and signal strength signal intensity identical with described test signal and comprises greater than the step of the feedback signal of described test signal:
Described test signal is reflected with the generation wavelength reflected signal identical with described test signal, and described reflected signal is carried out processing and amplifying, the reflected signal after the wherein said amplification is as described feedback signal; Perhaps,
Described test signal is amplified, and the test signal after amplifying is reflected, wherein the signal of reflection back generation is as described feedback signal.
15. a fiber optic network checkout gear is characterized in that, comprising:
Extraction module is used for the test signal that office testing device sends is extracted from branch optical fiber;
The gain reflecting module is used for according to the test signal extracted, generates the feedback signal of wavelength and signal strength signal intensity identical with described test signal greater than described test signal;
Sending module is used for described feedback signal is returned to described office testing device, so that described office testing device detects the characteristic of channel of described branch optical fiber according to described feedback signal.
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| CN2010101762451A CN102244541A (en) | 2010-05-13 | 2010-05-13 | Detection method, system and device for P2MP (point to multi-point) optical network |
| PCT/CN2011/073726 WO2011140953A1 (en) | 2010-05-13 | 2011-05-06 | Detection method, system and device for point to multi-point fiber network |
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| CN2010101762451A CN102244541A (en) | 2010-05-13 | 2010-05-13 | Detection method, system and device for P2MP (point to multi-point) optical network |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102714545A (en) * | 2012-02-21 | 2012-10-03 | 华为技术有限公司 | Optical transceiver module, passive optical network system, optical fiber detection method and system |
| CN103227677A (en) * | 2013-04-28 | 2013-07-31 | 桂林聚联科技有限公司 | Optical fiber reflector and method of utilizing optical fiber reflector to achieve PON monitoring |
| WO2015058497A1 (en) * | 2013-10-25 | 2015-04-30 | 华为技术有限公司 | Method, device, and system for optical fiber link identification |
| TWI562552B (en) * | 2014-04-21 | 2016-12-11 | Arris Entpr Inc | Systems and methods for optical modulation index calibration in a catv network |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1704832A (en) * | 2004-06-02 | 2005-12-07 | 韩国电子通信研究院 | Optical transmission line monitoring system using a gain clamped optical amplifier |
| CN1726664A (en) * | 2002-12-16 | 2006-01-25 | 阿斯顿光学技术有限公司 | Optical interrogation system and sensor system |
| CN101328803A (en) * | 2007-06-22 | 2008-12-24 | 普拉德研究及开发股份有限公司 | Controlling a dynamic signal range in an optical time domain reflectometry |
| WO2009129647A1 (en) * | 2008-04-21 | 2009-10-29 | Oplink Communications, Inc. | Fiber network monitoring |
| WO2009158382A1 (en) * | 2008-06-26 | 2009-12-30 | Tyco Telecommunications (Us) Inc. | High loss loop back for long repeater span |
| WO2010043056A1 (en) * | 2008-10-17 | 2010-04-22 | Exfo Electro-Optical Engineering Inc. | Method and apparatus for deriving parameters of optical paths in optical networks using a two-wavelength otdr and a wavelength-dependent reflective element |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100526560B1 (en) * | 2002-12-07 | 2005-11-03 | 삼성전자주식회사 | Optical fiber amplifier having automatic power control function and automatic power control method thereof |
| CN100558013C (en) * | 2005-04-29 | 2009-11-04 | 财团法人工业技术研究院 | A kind of monitoring device of fiber optic network and method |
| CN101043272A (en) * | 2006-06-08 | 2007-09-26 | 华为技术有限公司 | System and method for detecting optical fiber wiring troubles |
| DK2274595T3 (en) * | 2008-05-09 | 2018-01-29 | Afl Telecommunications Llc | Optical time domain reflectometer |
-
2010
- 2010-05-13 CN CN2010101762451A patent/CN102244541A/en active Pending
-
2011
- 2011-05-06 WO PCT/CN2011/073726 patent/WO2011140953A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1726664A (en) * | 2002-12-16 | 2006-01-25 | 阿斯顿光学技术有限公司 | Optical interrogation system and sensor system |
| CN1704832A (en) * | 2004-06-02 | 2005-12-07 | 韩国电子通信研究院 | Optical transmission line monitoring system using a gain clamped optical amplifier |
| CN101328803A (en) * | 2007-06-22 | 2008-12-24 | 普拉德研究及开发股份有限公司 | Controlling a dynamic signal range in an optical time domain reflectometry |
| WO2009129647A1 (en) * | 2008-04-21 | 2009-10-29 | Oplink Communications, Inc. | Fiber network monitoring |
| WO2009158382A1 (en) * | 2008-06-26 | 2009-12-30 | Tyco Telecommunications (Us) Inc. | High loss loop back for long repeater span |
| WO2010043056A1 (en) * | 2008-10-17 | 2010-04-22 | Exfo Electro-Optical Engineering Inc. | Method and apparatus for deriving parameters of optical paths in optical networks using a two-wavelength otdr and a wavelength-dependent reflective element |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102714545B (en) * | 2012-02-21 | 2015-04-08 | 华为技术有限公司 | Optical transceiver module, passive optical network system, optical fiber detection method and system |
| CN102714545A (en) * | 2012-02-21 | 2012-10-03 | 华为技术有限公司 | Optical transceiver module, passive optical network system, optical fiber detection method and system |
| CN103227677A (en) * | 2013-04-28 | 2013-07-31 | 桂林聚联科技有限公司 | Optical fiber reflector and method of utilizing optical fiber reflector to achieve PON monitoring |
| US9774390B2 (en) | 2013-10-25 | 2017-09-26 | Huawei Technologies Co., Ltd. | Fiber link recognition method, device, and system |
| WO2015058497A1 (en) * | 2013-10-25 | 2015-04-30 | 华为技术有限公司 | Method, device, and system for optical fiber link identification |
| TWI562552B (en) * | 2014-04-21 | 2016-12-11 | Arris Entpr Inc | Systems and methods for optical modulation index calibration in a catv network |
| CN107925474A (en) * | 2015-09-08 | 2018-04-17 | 华为技术有限公司 | Wavelength alignment methods, device, related device and the system of a kind of tunable laser |
| WO2017041224A1 (en) * | 2015-09-08 | 2017-03-16 | 华为技术有限公司 | Adjustable laser wavelength alignment method and device, and related apparatus and system |
| CN107925474B (en) * | 2015-09-08 | 2020-05-08 | 华为技术有限公司 | Wavelength alignment method and device of tunable laser, related device and system |
| CN106452574A (en) * | 2016-10-20 | 2017-02-22 | 云南电网有限责任公司电力科学研究院 | Optical interface characteristic test platform and method of power distribution network EPON system |
| CN106452574B (en) * | 2016-10-20 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of the optical interface platform for testing characteristics and method of power distribution network EPON system |
| CN112583475A (en) * | 2019-09-27 | 2021-03-30 | 华为技术有限公司 | Test method, optical line terminal and optical network terminal |
| CN112583475B (en) * | 2019-09-27 | 2022-08-19 | 华为技术有限公司 | Test method, optical line terminal and optical network terminal |
| CN113541988A (en) * | 2020-04-17 | 2021-10-22 | 华为技术有限公司 | Network fault processing method and device |
| CN112564785A (en) * | 2020-11-19 | 2021-03-26 | 华为技术有限公司 | ODN device, optical fiber splice closure, network detection device and optical distribution network |
| CN112564785B (en) * | 2020-11-19 | 2022-08-26 | 华为技术有限公司 | ODN device, optical fiber splice closure, network detection device and optical distribution network |
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