CN101232328B - Method for locating case point of branch optical fiber, optical network and network appliance - Google Patents

Method for locating case point of branch optical fiber, optical network and network appliance Download PDF

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Publication number
CN101232328B
CN101232328B CN2008100069923A CN200810006992A CN101232328B CN 101232328 B CN101232328 B CN 101232328B CN 2008100069923 A CN2008100069923 A CN 2008100069923A CN 200810006992 A CN200810006992 A CN 200810006992A CN 101232328 B CN101232328 B CN 101232328B
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optical fiber
optical
loss
olt
tested
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CN101232328A (en
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杨素林
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2008100069923A priority patent/CN101232328B/en
Publication of CN101232328A publication Critical patent/CN101232328A/en
Priority claimed from PCT/CN2009/070310 external-priority patent/WO2009094952A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0791Fault location on the transmission path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time-domain reflectometers [OTDRs]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0771Fault location on the transmission path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • H04B10/272Star-type networks or tree-type networks

Abstract

The invention relates to the communication field, and the embodiment of the invention discloses a method for positioning an optical fiber event point with the following steps that: the distance from the event point to an optical line terminal OLT is determined; the optical loss of an optical path between the OLT and an optical network unit ONU or an optical network terminal ONT which is arranged at the opposite end of an optical fiber link to be measured; whether the event point is positioned on the optical filter link to be measured is determined according to the optical loss of the optical path which is obtained by the measurement, if yes, the position of the event point on the optical fiber link to be measured is determined according to the distance from the event point to the OLT. Theembodiment of the invention further discloses an optical network and a network device; The method realizes the function of positioning the event point on the optical fiber on the OLT side.

Description

A kind of method, optical-fiber network and network equipment of locating the case point of branch optical fiber
Technical field
The present invention relates to the communications field, relate to a kind of method, optical-fiber network and network equipment of locating the case point of branch optical fiber especially.
Background technology
The Access Network field is after digital subscriber line (Digital Subscriber Line or abbreviation DSL) fully develops at present, light inserts and also is surging forward, especially put the light access technology of multiple spot feature--EPON (Passive Optical Network is called for short PON) is attracted attention once more.Insert with point-to-point and to compare, the PON local side with an optical fiber can be divided into tens of in addition more multi-channel optical fibre connect the user, can reduce the networking cost greatly.At present, representative PON technology is Gigabit Passive Optical Network (Gigabit Passive Optical Network, be called for short GPON) and ethernet passive optical network (Ethernet Passive Optical Network, be called for short EPON), wherein the GPON technology has characteristics such as higher line speed, maintenance function be more perfect, so be employed wider.
Figure 1 shows that the structural representation of PON system, as shown, this system comprises following three parts: connect light distributed network (Optical Distribution Network, be called for short ODN) 12 with optical line terminal (the Optical Line Termination of other networks (such as PSTN14, internet 15, cable television network 16), be called for short OLT) 11, light distributed network 12 and optical network unit (Optical Network Unit, be called for short ONTU)/Optical Network Terminal (Optical Network Termination is called for short ONT) 13.In the PON system, transmission from OLT11 to the ONU/ONT13 direction is called descending, otherwise be called up, downlink data is because the characteristic of light is broadcast to each ONU/ONT13 by OLT11, the downlink time division multiplex mode, the upstream data of each ONU/ONT13 sends by OLT11 and distributes transmission space, up time-division multiplexing multiple access.Wherein OLT11 connects the function of one or more ODN12 for the PON system provides the network side interface; ODN12 is the passive optical splitters part, and the transfer of data that OLT11 is descending is to each ONU/ONT13, the upstream data of a plurality of ONU/ONT13 is gathered to be transferred to OLT11 simultaneously; ONU provides user side interface for the PON system, uply links to each other with ODN, if ONU directly provides User Port Function, the ethernet user's port such as PC online usefulness then is called ONT.ODN12 generally is divided into three parts: passive optical splitter (Splitter) 121, trunk optical fiber 122 and branch optical fiber 123.
In the running of PON system; the measurement of optical fiber transmission property is the important content of PON system maintenance; by fibre circuit monitoring can be automatically, lasting fibre circuit is carried out online remote monitoring; the fibre circuit of periodic maintenance PON system; the remote identification fault; can realize fast reaction,, realize that the quick protection of bottom is switched so that before upper layer network is influenced to fault.
Optical time domain reflectometer (Optical Time Domain Reflectometer is called for short OTDR), optical frequency domain reflectometer (Optical Frequency-Domain Reflectometry is called for short OFDR) etc. are the measuring equipments of measuring optical fiber transmission characteristic.Wherein OTDR provides the decay details that distributes along fiber lengths, comprises the incident of any position on detection, location and the measuring optical fiber cable link.Incident is meant in the optical fiber link because the defective that welding, connector, adapter, wire jumper, bending or fracture etc. form.The variation of the light-transfer characteristic that this defective causes can be measured by OTDR, and OTDR can position incident according to the variation of the light-transfer characteristic that records.The mode of the similar radar scanning of operation principle of OTDR, OTDR sends test massage, the intensity and the time delay of the signal that monitoring test signal arrival event point back is reflected by case point, and according to the type of definite incident and the position of case point.OFDR and OTDR institute difference are, are not to measure as OTDR parameter service time, but frequency of utilization.
But, in the network topology of the point-to-multipoint of PON, the test signal that fiber-optic probe equipment such as OLT side OTDR or OFDR send is superimposed through the signal that each branch reflects, and fiber-optic probe equipment such as OTDR or OFDR can not be distinguished the branch optical fiber at case point place.In view of this, the scheme for the fibre circuit monitoring mainly contains following two kinds in the prior art:
First kind is by Y.Enomoto, H.Imita is on " optical fiber communication " periodical in 2003, exercise question is " the fibre circuit monitoring system with 31.5dB dynamic range with fiber failure monitoring function with PON system setting of 32 branch optical fibers " (Y.Enomoto, H.I mita, " Over 31.5dBDynamic Range Optical Fiber Line Testing System with Optical Fiber Fault Isolation Function for 32-Branched PON " OFC2003) in the document, a kind of monitoring method has been proposed, this method specifically is that the end at every branch optical fiber adds a speculum, the reflection measurement signal, in order to make the waveform of every branch optical fiber end reflection light be unlikely to overlapping, when the PON networking, need make that the length of every branch optical fiber is different, and in test, can monitor branch optical fiber by the waveform of monitoring every branch optical fiber.Yet because the precondition of this monitoring technology is to guarantee that every fiber lengths in the PON system is different, this has increased difficulty for actual networking wiring, and actual applicability is relatively poor.
Because the actual applicability of first kind of scheme a little less than, and because the difficulty that the OLT side of PON network fiber is measured is that branch optical fiber can be superimposed to the test signal back reflection signal that OTDR sends, thereby cause to distinguish the incident of concrete certain bar branch optical fiber, people have proposed second kind of scheme, specifically:
As shown in Figure 2, from ONU/ONT201 side monitoring PON network fiber, an integrated fiber-optic probe equipment 220 (OTDR or OFDR etc.) on each ONU/ONT201, the branch optical fiber and the trunk optical fiber at this ONU/ONT201 place monitored in fiber-optic probe equipment 220 timesharing on each ONU/ONT201, and test data or result are uploaded to OLT210 by data feedback channel.Use this method and can solve that to use fiber-optic probe monitoring of equipments such as OTDR or OFDR not locate in the OLT side specifically be the problem of the case point on which branch optical fiber, use this technical scheme and can orient incident on branch optical fiber or the trunk optical fiber easily.But because fiber-optic probe equipment such as OTDR or OFDR or function are very expensive, if fiber-optic probe equipment such as an OTDR or OFDR all are set on each ONU/ONT of the PON network terminal will cause network monitor with high costs being positioned at.
In addition, because that test result must be delivered to the OLT side of local side is just valuable, when line broken circuit or decay when excessive, if OLT can not normally receive test data or test result, it is still invalid to test.
Summary of the invention
The embodiment of the invention provides a kind of method, light networking and network equipment of case point of positioning optical waveguides, even realize that case point occurs on the branch optical fiber, also can position in the OLT side.
The embodiment of the invention discloses a kind of method of case point of positioning optical waveguides, comprising: determine the distance of case point from optical line terminal OLT; Measure the optical loss of light path between the optical network unit ONU of described OLT and tested optical fiber link opposite end or the Optical Network Terminal ONT; Determine that according to the optical loss of the described light path that measures described case point is whether on described tested optical fiber link, if then according to the distance of described case point from described OLT, determine the position of described case point on described tested optical fiber link.
The embodiment of the invention also discloses a kind of optical-fiber network, comprising: the optical loss measuring unit is used to measure the optical loss of light path between the optical network unit ONU of optical line terminal OLT and tested optical fiber link opposite end or the Optical Network Terminal ONT; Judging unit, the optical loss that is used for the described light path that measures according to described optical loss measuring unit determines that whether case point is at described tested optical fiber link; The case point position determination unit, be used for determining the distance of described case point from described OLT, and when described judging unit determines that described case point is on described tested optical fiber link, determine the position of described case point on described tested optical fiber link from the distance of described OLT according to described case point.
The embodiment of the invention also discloses a kind of network equipment, the described network equipment is an optical line terminal OLT, it is characterized in that, comprising: the optical loss measuring unit is used to measure the optical loss of light path between the optical network unit ONU of optical line terminal OLT and tested optical fiber link opposite end or the Optical Network Terminal ONT; Judging unit is used for determining that according to the described light path optical loss that described optical loss measuring unit measures whether case point is at described tested optical fiber link; The case point position determination unit, be used for determining the distance of described case point and described OLT, and when described judging unit determines that described case point is on described tested optical fiber link, determine the position of described case point on described tested optical fiber link from the distance of described OLT according to described case point.
The embodiment of the invention also discloses a kind of network equipment, the described network equipment is optical network unit ONU or Optical Network Terminal ONT, described ONU or ONT comprise: reflection unit, be used for when being in open mode the sending direction of received test signal against described test signal, the transmitting terminal of the described test signal of reflected back; And when being in closed condition, not with the transmitting terminal of the received described test signal of test signal reflected back.
The embodiment of the invention also discloses a kind of network equipment, the described network equipment is optical network unit ONU or Optical Network Terminal ONT, described ONU or ONT comprise: the energy measurement unit, be used to measure the energy of test signal, the energy of wherein said test signal comprises: the energy of the test signal that local terminal sends or from the energy of the received test signal of opposite end OLT; Transmitting element is used for the measurement result of described energy measurement unit is sent to the OLT that links to each other with this ONU or ONT.
The embodiment of the invention also discloses a kind of optical-fiber network, comprising: aforesaid OLT and ONU or ONT.
The embodiment of the invention also discloses a kind of method of case point of positioning optical waveguides, comprising: determine the distance of case point from optical line terminal OLT; Measure the actual reception energy of described ONU or the up test signal of ONT; Relation between the normal received energy of the actual reception energy of more described up test signal and the up test signal of preserving in advance; Determine that according to described comparative result described case point is whether on described tested optical fiber link, if then according to the distance of described case point from described OLT, determine the position of described case point on described tested optical fiber link.
The embodiment of the invention also discloses a kind of network equipment, the described network equipment is an optical line terminal OLT, comprising: measuring unit is used to measure the actual reception energy of described ONU or the up test signal of ONT; Judging unit, be used for the actual reception energy of more described up test signal and the normal received energy of the up test signal of preserving in advance between relation, and determine that according to described comparative result described case point is whether on described tested optical fiber link; The case point position determination unit, be used for determining the distance of described case point and described OLT, and when described judging unit determines that described case point is on described tested optical fiber link, determine the position of described case point on described tested optical fiber link from the distance of described OLT according to described case point.
Above technical scheme as can be seen, because the technical scheme of the embodiment of the invention is by the optical loss of the light path between OLT and the ONU/ONT on the measurement tested optical fiber link, determine that according to the optical loss of this light path of measuring described case point is whether on described tested optical fiber link again, if determine that this case point is at described tested optical fiber link, then, determine the particular location of case point on this tested optical fiber link according to the distance of case point from OLT.Make and can only need use fiber-optic probe equipment, determine the distance of case point, utilize the optical path loss measurement data again from optical line terminal OLT in the OLT side, just can be at the case point on (even case point is at branch optical fiber) on the tested optical fiber link of OLT side location.Avoided in the high problem of ONU/ONT side monitoring cost, greatly reduced cost with respect to second kind of technical scheme of prior art.In addition, embodiment of the invention technical scheme does not require for the wirings such as length of each branch optical fiber of PON network, has more application feasibility with respect to first kind of technical scheme of prior art.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is existing PON system configuration schematic diagram;
Fig. 2 is provided with the system configuration schematic diagram that fiber-optic probe equipment is monitored in second kind of scheme of prior art in each ONU/UNT side;
The method flow schematic diagram of the case point of the location branch optical fiber that provides in the embodiment of the invention 1 is provided Fig. 3;
A kind of energy measurement unit by OLT side optical fibers detecting devices, OLT and ONU/ONT side of Fig. 4 for providing in the embodiment of the invention 1, the schematic diagram of realization location branch optical fiber case point method;
A kind of reflection unit by OLT side optical fibers detecting devices and energy measurement unit, ONU/ONT side of Fig. 5 for providing in the embodiment of the invention 1 realized the schematic diagram of location branch optical fiber case point method;
A kind of OLT structural representation of Fig. 6 for providing in the embodiment of the invention 2;
The another kind of OLT structural representation of Fig. 7 for providing in the embodiment of the invention 2;
The first kind optical network structure schematic diagram of Fig. 8 for providing in the embodiment of the invention 3;
The second kind optical network structure schematic diagram of Fig. 9 for providing in the embodiment of the invention 3;
Figure 10 the third optical network structure schematic diagram for providing in the embodiment of the invention 3;
The structural representation of the OU/ONT that provides in the embodiment of the invention 4 is provided Figure 11.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
Embodiment 1:
The schematic flow sheet of the method for a kind of case point of locating branch optical fiber that Fig. 3 provides for present embodiment, show that as Fig. 3 the present embodiment method may further comprise the steps:
Step 301: determine the type of case point and determine the distance of case point from OLT.
Can OTDR, an OFDR or other fiber-optic probe equipment or function be set the OLT side in PON, determine case point by OTDR, OFDR or other fiber-optic probe device measuring, and this case point be from the distance of this OTDR place OLT.Realize determining the function of case point from the distance of OLT, promptly can adopt separate equipment such as OTDR, OFDR or other fiber-optic probe equipment to finish, also can finish from the module (as OTDR, OFDR or other fiber-optic probe function) of the function of the distance of OLT by having definite case point at OLT inside integrated.
With OTDR is example: specifically as shown in Figure 4, the OLT401 side is provided with an OTDR4011, behind the test signal 402 arrival event points 403 that OTDR4011 sends, be reflected back toward OTDR4011, OTDR4011 is according to the characteristic and the time delays such as power of the test signal of reflected back, determine the type and the position of case point, the distance of this case point from this OLT specifically can be determined according to the transmission speed and the time delay of test signal in this position.If this fiber-optic probe equipment is OFDR or other fiber-optic probe equipment, specifically can measure with reference to the method for measurement of prior art, do not give unnecessary details at this.
Step 302: judge that this case point is whether on trunk optical fiber, if then execution in step 303; Otherwise, execution in step 304.
If this case point is no more than the distance of trunk optical fiber from the distance of this OLT, can determine that then this case point exists on the trunk optical fiber, because trunk optical fiber has only one, execution in step 303 just can be determined the particular location of this case point on this trunk optical fiber with reference to prior art.
If this case point surpasses the distance of trunk optical fiber from the distance of this OLT, can determine that then this case point is present in this OLT to the branch optical fiber of certain ONU/ONT, execution in step 304 is located the branch optical fiber at this case point place.
Step 303: determine the particular location of this case point on trunk optical fiber.
What deserves to be explained is, because the purpose of the embodiment of the invention is the case point on definite branch optical fiber, if do not need to determine that case point whether when the particular location on the trunk optical fiber and on trunk optical fiber, can omit the process of step 302, step 303.
Step 304: the optical loss of the light path between test OLT and the ONU/ONT.
The realization of this step specifically can be with reference to shown in Figure 4, the testing equipment or the function of a test signal energy (can power represent) are set respectively on OLT and each ONU/ONT, at this this equipment or function are called the energy measurement unit, as shown, the power or the energy of the test signal that these OLT send to certain ONU/ONT405 place branch optical fiber (this test signal can for: current data signals transmitted can also be to be this test specific test signal of emission separately specially) measured in the energy measurement unit 404 of OLT401 side.The ONU/ONT405 side joint is received (descending test signal can be downlink data signal or other signals that are different from downlink data signal) after the descending test signal that OLT sends, use is arranged on the energy (corresponding can also power represent) of the signal that energy measurement unit 406 test of this ONU/ONT405 side receives, and with the energy test result by passing OLT401 on the data feedback channel back; The energy test result of the energy measurement unit 404 of OLT401 by being arranged on this side and the energy test result who uploads by ONU/ONT405 who receives, calculate the optical loss of OLT401 to light path between the ONU/ONT405, this optical loss can be described as the optical loss of down direction.Above-mentioned energy test result can be a single light signal energy measurements, also can be the result who obtains after the process data processing (as average computation etc.) of repeatedly light signal energy measurements.
Determine and ONU/ONT405 between the optical loss of light path, can also get to the optical loss of light path between the OLT401 by calculating ONU/ONT405, this optical loss can be described as the optical loss of up direction, should specifically test, computational methods can be with reference to the method for measurement of down direction optical loss, different is, measured by this ONU/ONT405 by energy from data feedback channel to the test signal of OLT401 transmission by the energy measurement unit 406 that is arranged on the ONU/ONT405 side this moment, and the energy test result is uploaded to OLT401 by data feedback channel, after receiving the test signal of sending by ONU/ONT405 at the OLT401 side joint, measure the energy of the up test signal of receiving at the OLT401 side joint by energy measurement unit 404, then according to the test result of energy measurement unit 404, and the test signal that records of the ONU/ONT405 that receives is in the energy measurements of transmitting terminal, calculate the optical loss of ONU/ONT405 to light path between the OLT401, this optical loss can be described as the optical loss of up direction.Up test signal can be upstream data. signals or other signals that are different from upstream data. signals.At this, the optical loss that calculates light path both can carry out in the OLT401 side; Also can carry out, get final product passing OLT401 on the result of calculation back again in the ONU/ONT405 side.Calculating optical path loss by ONU/ONT405 is similarly with the principle of calculating optical path losses by OLT 401, and just the energy demand of the test signal that records of OLT side passes to ONU/ONT405 by down going channel, calculates optical path loss by ONU/ONT405.
General, when determining the optical loss of light path between OLT and the ONU/ONT, only need the optical loss of this light path direction of test (up direction or down direction) to get final product, but on light path between same OLT and the ONU/ONT, the optical loss of the light path of two directions has small difference, if measuring accuracy requires high, can be by the optical loss of difference optical system for testing two directions, remove unidirectional lack of uniformity through corresponding algorithm process (as the weighted average scheduling algorithm), make that the optical loss measurement result of light path is more accurate.
The specific implementation method of this step can also be with reference to shown in Figure 5, in the OLT501 side test energy measurement unit 502 is set, front end at each ONU/ONT503 side Transmit-Receive Unit 506 is provided with a reflector element 504 respectively, will be when each reflector element 504 is opened with the signal that arrives this node against this signalling to the reflected back signal sending end, and will not possess any reflection function when closing.Again because the connector of operate as normal and welding point can be up to more than the 40dB to the return loss of signal, so the reverberation of the branch optical fiber branch road do not opened of reflector element 504 can be ignored the influence of the reflected signal on the tested branch optical fiber branch road.
As shown in Figure 5, OLT501 sends control information to each ONU/ONT503, opens the reflector element 504 of the ONU/ONT503 side at current branch optical fiber place to be tested, and closes the reflector element 504 of other all ONU/ONT503 sides.In addition, by the tested branch optical fiber of OLT501 side direction send test massage 505, and the energy measurement unit 502 of OLT501 side measures the energy of the test signal that these OLT send to this branch optical fiber, establishing its value is Ps.After test signal 505 arrives each ONU/ONT503, owing to have only the reflector element 504 of branch optical fiber to be measured to open, therefore have only ONU/ONT503 lateral reflection unit 504 on the branch optical fiber to be measured with test signal 505 against the former sending direction of test signal, be reflected back into transmitting terminal OLT501.And 504 pairs of test signals of the reflector element of other ONU/ONT503 side do not reflect.After the OLT501 side joint is received the test signal 505 that reflects, measure the energy of the test signal 505 that is reflected back toward, establish its value and be Pr.OLT501 can be with reference to computational methods of the prior art, energy Pr according to the energy Ps of the test signal 505 that is sent and the test signal 505 that is reflected back toward, calculate the OLT501 on this test branch optical fiber and the optical loss of the light path between the ONU/ONT503, comprise round trip optical loss and one way optical loss, wherein the one way optical loss is 1/2nd of a round trip optical loss, by measuring the method measuring light loss of round trip optical loss, can eliminate the lack of uniformity of unidirectional measurement, make that the optical loss measurement result of light path is more accurate.
What deserves to be explained is, extension by optical loss method of measurement shown in Figure 5, energy measurement unit 502 can also be arranged on the ONU/UNT side of PON terminal, and reflector element 504 is arranged on the OLT side, get final product by being back to the OLT side, but this kind method of measurement generally needs higher cost with respect to above-mentioned method of measurement at the optical loss that the ONU/UNT side is measured.
Step 305: judge that case point is whether on current branch optical fiber, if then execution in step 306; Otherwise execution in step 307.
As shown in Figure 4, obtain after the optical loss of OLT401 light path (corresponding certain branch optical fiber) between certain ONU/ONT405, the relation of the normal loss corresponding with this light path according to the optical loss of this light path (normal loss of one way or round trip during the optical fiber fault-free) judges that case point is whether on current branch optical fiber: if this optical loss is greater than normal loss, then judge case point on current branch optical fiber, then further execution in step 306; If this optical loss equals normal loss, then judge case point not on current branch optical fiber, execution in step 307.
Step 306:, determine the position of this case point on described optical fiber according to the distance of this case point from OLT.
Obviously, determined which branch optical fiber case point specifically exists after, this case point of determining according to step 301 can be determined the position of this case point on described branch optical fiber from the distance of OLT.
Step 307: continue monitoring and definite case point and whether exist on other branch optical fibers, and the particular location on this branch optical fiber.
This step specific implementation can be carried out to the flow process of step 306 with reference to step 304, does not give unnecessary details at this.
What deserves to be explained is, principle from present embodiment, during the position of the case point on determining branch optical fiber, also can determine the optical loss of light path earlier, determine whether there is case point on this light path according to the optical loss of light path, if exist, determine the distance of case point again from OLT, determine the particular location of case point on branch optical fiber in this way.
What deserves to be explained is,, use embodiment of the invention method,, also can locate the case point of this branch optical fiber by the mode of getting rid of even the excessive or disconnected fibre of certain bar fibre loss causes the data of the ONU/ONT side on this branch optical fiber not upload.
Therefore, utilize the present embodiment method, only need OTDR, an OFDR or other fiber-optic probe equipment or function be set in the OLT side that is positioned at optical network local side, and the OLT side of a reflection unit with measuring-signal reflected back local side is set in the ONU/ONT side that is positioned at Optical Network Terminal, perhaps an energy measurement unit is set and measures the position that the energy of test signal can realize locating the case point on the branch optical fiber at this end in the ONU/ONT side.And need the high OTDR of price, OFDR or other fiber-optic probe equipment or function be set in the ONU/ONT side, so the present embodiment method greatly reduces the network monitor cost with respect to the second method of prior art.Simultaneously, the present embodiment method does not need the optical fiber in the network is imposed any restrictions, and has improved the practical application feasibility of scheme greatly with respect to first kind of scheme of prior art.
Embodiment 2:
A kind of OLT structural representation (corresponding to method shown in Figure 5) that Fig. 6 provides for present embodiment, as shown, this OLT comprises:
Optical loss measuring unit 602 is used to measure the optical loss of light path between the ONU/ONT of described OLT and tested branch optical fiber opposite end.Optical loss determining unit 602 can comprise:
Energy measurement unit 6021 is used to measure the energy of test signal, and the energy of wherein said test signal comprises: by described OLT side send to the energy of the test signal of described ONU/ONT side, the energy of the test signal of returning by described ONU/ONT lateral reflection.
Computing unit 6022 is used for the energy of the test signal that is sent that records according to described energy measurement unit 6021, the energy of the described test signal that reflects, and determines the optical loss of light path between described OLT and the ONU/ONT
This OLT also comprises:
Judging unit 603 is used for the relation of the normal loss of the optical loss of this light path of determining according to optical loss measuring unit 602 and described light path, determines that described case point is whether on described branch optical fiber.If this optical loss, is then judged case point greater than normal loss on current branch optical fiber,, judge that then case point is not on current branch optical fiber if this optical loss equals normal loss.
Case point position determination unit 601, be used for determining the distance of described case point and described OLT, and when described judging unit determines that described case point is on described branch optical fiber,, determine the position of described case point on described optical fiber according to the distance of described case point from described OLT.
Case point position determination unit 601 can adopt OTDR, OFDR or other fiber-optic probe equipment to realize, the type of at first definite case point and this case point are from the distance of this OLT, if case point position determination unit 601 is determined these case points and is less than or equal to the length of trunk optical fiber from the distance of this OLT that then this case point is on trunk optical fiber; Otherwise, this case point with branch optical fiber that this trunk optical fiber is connected on.
For case point with branch optical fiber that this trunk optical fiber is connected on situation, when judging unit 603 determines that case point is on current branch optical fiber, this case point of determining according to case point position determination unit 601 is determined the position of case point on described optical fiber from the distance of described OLT.
The another kind of OLT structural representation that Fig. 7 provides for present embodiment (corresponding shown in Figure 4 method) shows as Fig. 7, and different is to be optical loss measuring unit 702 for this OLT and OLT shown in Figure 6, and at this, optical loss measuring unit 702 comprises:
Energy measurement unit 7021, be used to measure the energy of test signal, the energy of wherein said test signal is: send to by the OLT side tested branch optical fiber opposite end the ONU/ONT side test signal energy and/or arrive the energy of this OLT by the test signal that the ONU/ONT side of tested branch optical fiber opposite end is sent.
The opposite end energy test is acquiring unit 7022 as a result, be used to obtain the energy in the measured test signal in tested branch optical fiber opposite end, wherein the energy of this test signal is: the test signal that the OLT side sends arrives energy that the ONU/ONT side of this tested branch optical fiber opposite end had or the energy that sends to the test signal (in described ONU/ONT side) of this OLT side from the ONU/ONT side of this tested branch optical fiber opposite end.
This function can be provided with an energy measurement unit by the ONU/ONT side in tested branch optical fiber opposite end, arrive with test this end test signal energy value or measure from this end and send to the energy that the test signal (in this ONU/ONT side) of the OLT side of tested optical fiber opposite end is had, and the opposite end energy test that test result is uploaded to OLT end acquiring unit 7022 as a result, opposite end energy test acquiring unit 7022 as a result is informed in the measured energy value of ONU/ONT side of tested branch optical fiber opposite end according to the result who uploads.
What deserves to be explained is, even the excessive or disconnected fibre of certain bar fibre loss causes the measurement data of the ONU/ONT side on this branch optical fiber can not be uploaded to the OLT of transmitting terminal, use the OLT of present embodiment, by the mode of getting rid of, also can locate the case point of this branch optical fiber.
Computing unit 7023 is used for the energy that the energy according to the test signal of described transmission, described test signal arrive described ON/ONT, determines the optical loss of light path between described OLT and the ONU/ONT; The perhaps energy of the test signal that sends according to the energy of the test signal of described reception, described ONU/ONT side is determined the optical loss of light path between described OLT and the ONU/ONT.
Therefore, when case point is not on trunk optical fiber, the OLT that present embodiment provides can utilize optical loss measuring unit 702 to determine the optical loss of this OLT to light path between the ONU/ONT of tested branch optical fiber opposite end, the optical loss result who obtains according to optical loss measuring unit 702 by judging unit 603 again, and compare with normal loss and to determine that case point is whether on current tested branch optical fiber, if, can at first determine the distance of this case point and OLT by case point position determination unit 601, again according to this apart from the position of locating events point on this branch optical fiber.As seen the OLT that provides of present embodiment can support to locate the function of the case point on the branch optical fiber with respect to the OLT of prior art, has realized carrying out in the OLT side function of case point Monitoring and Positioning.
Embodiment 3:
A kind of optical network structure schematic diagram that Fig. 8 provides for present embodiment, as shown, this optical-fiber network mainly comprises: OLT80, ONU/ONT81, passive optical splitter; This optical-fiber network specifically comprises:
Optical loss measuring unit 802 is used to measure the optical loss of light path between the ONU/ONT of described OLT and tested branch optical fiber opposite end.In optical-fiber network, optical loss measuring unit 802 can comprise:
Be arranged on the transmission energy measurement unit 8021 of OLT80 side, be used for sending to the energy of the test signal of light path between the ONU/ONT81 of OLT801 and described tested branch optical fiber opposite end in transmitting terminal OLT80 measurement.
Be arranged on the received energy measuring unit 8022 of the ONU/ONT81 side of tested branch optical fiber opposite end, be used for measuring the energy that described test signal arrives described receiving terminal at receiving terminal, after received energy measuring unit 8022 records data, upload the computing unit 8023 that postbacks the OLT80 side of giving this test signal with measurement result or through the measurement result of respective handling (as average computation) by data feedback channel.
Be arranged on the computing unit 8023 of OLT80 side, be used for according to the energy that sends the optical tests signal that transmitting terminal sent that energy measurement unit 8021 records, the energy of the optical tests signal that records at receiving terminal ONU/ONT81 that received energy measuring unit 8022 returns is determined the optical loss of light path between described OLT80 and the ONU/ONT81.
Be arranged on the judging unit 803 of OLT80 side, be used for the optical loss determined according to optical loss measuring unit 802 and the magnitude relationship of normal loss, determine that described case point is whether on described branch optical fiber: if this optical loss is greater than normal loss, judge that then case point is on current branch optical fiber, if this optical loss equals normal loss, judge that then case point is not on current branch optical fiber.
Be arranged on the case point position determination unit 801 of OLT80 side, be used for determining described case point from the distance of described OLT, and when described judging unit determines that described case point is on described branch optical fiber, according to the distance of described case point, determine the position of described case point on described optical fiber from described OLT.
Case point position determination unit 801 is at first determined the distance of case point from the OLT at present event point position determination unit place.General, based on cost consideration this case point position determination unit 801 is arranged on the OLT80 side, case point position determination unit 801 can adopt OTDR, OFDR or other fiber-optic probe equipment to realize, in order to the type of determining case point and this case point distance from this OLT80, if case point position determination unit 801 is determined these case points and is less than or equal to the length of trunk optical fiber from the distance of this OLT80 that then this case point is on trunk optical fiber; Otherwise, this case point with branch optical fiber that this trunk optical fiber is connected on.
For case point with branch optical fiber that this trunk optical fiber is connected on situation, when judging unit 803 judges that case point is on current tested branch optical fiber, this case point of determining according to case point position determination unit 801 is determined the position of described case point on described optical fiber from the distance of this OLT80.
In addition, as shown in Figure 9, the optical loss measuring unit 902 in the optical-fiber network can also adopt following frame mode, and optical loss measuring unit 902 comprises as shown:
Be arranged on the transmission energy measurement unit 9021 of ONU/ONT91 side, be used for the transmitting terminal ONU/ONT91 of test signal measurement send to and the OLT90 of described tested branch optical fiber opposite end between the energy of test signal of light path, after transmission energy measurement unit 9021 records data, the computing unit 9023 of OLT90 side will be passed back on the measurement result by data feedback channel.
Be arranged on the received energy measuring unit 9022 of the OLT90 side of tested branch optical fiber opposite end, be used for measuring the energy that described test signal arrives described receiving terminal at receiving terminal.
Be arranged on the computing unit 9023 of OLT90 side, be used for according to the energy that sends the optical tests signal that transmitting terminal sent that energy measurement unit 9021 records, the energy of the optical tests signal that received energy measuring unit 9022 records at receiving terminal OLT90 is determined the optical loss on the optical fiber link at described branch optical fiber place.
Other again, the optical loss measuring unit is except passing through Fig. 8, outside structure shown in Figure 9 realizes, can also realize by following structure: will send the energy measurement unit, the received energy measuring unit is separately positioned on tested branch optical fiber both sides (OLT, the ONU/ONT side), computing unit is arranged on the ONU/ONT side, at computing unit according to sending the energy measurement unit, the measurement result of received energy measuring unit, calculating gets access to after the optical loss of light path between OLT and the ONU/ONT, the computing unit of ONU/ONT side by passing the OLT side on the data feedback channel back, carries out corresponding judgment and location by the judging unit 803 and the case point position determination unit 804 of OLT side according to this optical path loss with result of calculation.
What deserves to be explained is, the above-mentioned optical-fiber network that provides is provided, even the excessive or disconnected fibre of certain bar fibre loss, cause the measurement result or the result of calculation of an end on this branch optical fiber can not be uploaded to the opposite end, use the optical-fiber network of present embodiment, by the mode of getting rid of, still can locate the case point of this branch optical fiber.
The another kind of optical network structure schematic diagram that Figure 10 provides for present embodiment, as shown, this optical network structure is that with optical network structure institute difference shown in Figure 8 the internal structure of optical loss measuring unit is different, and as shown in figure 10, optical loss measuring unit 1002 comprises:
Be arranged on the reflector element 1021 of the ONU/ONT101 side of tested branch optical fiber opposite end, be used for side, with arriving the test signal of described ONU/ONT101 side, the described transmitting terminal OLT100 of described test signal reflected back side at receiving terminal ONU/ONT101.
Be arranged on the energy measurement unit 1022 of OLT100 side, be used for measuring the energy of described test signal in the OLT100 side.The energy of described test signal comprises: the energy that sends to the test signal of the energy of the test signal of the light path between described OLT100 and the described ONU/ONT101, the described OLT100 side of unit 1021 reflected backs that is reflected.This energy measurement unit 1022 can be realized by general energy test unit, can also directly be realized by light return loss testing apparatus (OLTS).
Be arranged on the computing unit 1023 of OLT100 side, the energy of the test signal that the energy of the test signal of the described transmission that records according to energy measurement unit 1022 and being reflected is returned is determined the optical loss of light path between described OLT100 and the optical network unit ONU/ONT101.
Unit among other unit and Fig. 8 is basic identical, does not give unnecessary details at this.
Therefore the optical-fiber network that present embodiment provides has been realized the function of the case point on the branch optical fiber of OLT side location in terms of existing technologies.And, has strong application feasibility because the optical-fiber network of present embodiment does not need the length of each branch optical fiber in the network is done special restriction.Simultaneously in present networks, only the case point position determination unit (can be realized by OTDR, OFDR or other fiber-optic probe equipment) of cost costliness need be arranged on the OLT side, lowered network cost greatly.
Embodiment 4:
Figure 11 shows that the structural representation of the ONU/ONT that present embodiment provides, as shown, the ONU/ONT in the present embodiment also comprises compared to existing technology:
Energy measurement unit 1101, be used to measure the energy of test signal, wherein the energy of test signal comprises: ONU/ONT send to tested branch optical fiber opposite end the OLT side test signal energy or arrive the energy of described ONU or ONT by the test signal that the OLT side of this tested branch optical fiber opposite end is sent.
Transmitting element 1102 is used for the measurement result of energy measurement unit 1101 is sent to the OLT of optical fiber opposite end, makes this OLT to calculate the optical loss of this light path according to the measurement result of ONU/ONT side energy measurement unit 1101.Be implemented in the OLT side and position case point on the branch optical fiber, reduce the network monitor cost.
Embodiment 5:
Specifically shown in the ONU/ONT101 among Figure 10, this ONU/ONT compared with prior art also comprises the structure of ONU/ONT in the present embodiment:
Reflection unit 1021, be used for original optical path direction reflected back this test signal transmitting terminal OLT side of test signal against this test signal, it is the OLT side of tested branch optical fiber opposite end, make that this OLT can be by measuring the energy that this reflection back arrives the test signal of OLT side, in conjunction with the energy that this test signal has, calculate the optical loss of this light path when sending.Be implemented in the OLT side and position case point on the branch optical fiber, reduce the network monitor cost.
Embodiment 6:
Obtain the decay L0 of trunk optical fiber by the OTDR test of OLT side.The integrated measuring light power function of OLT and ONU side can obtain the Line Attenuation Li of link between OLT and i ONU.(Li-L0) be the Line Attenuation of the branch optical fiber at i ONU place.By the Line Attenuation and the attenuation change situation of monitoring every branch optical fiber, judge whether performance changes (whether having case point) on the corresponding branch optical fiber.Can obtain the position of the case point on the respective branches optical fiber again in conjunction with the test result of OLT end OTDR.
Embodiment 7:
General laser transmitting set is under normal operation, and the optical power change of the light signal of transmission is very little.Therefore, can also judge on the link at corresponding ONU place whether have case point by the method for OLT single end testing ONU upward signal luminous power.Concrete grammar is: OLT preserves ONU up test signal, and (this test signal can be the upstream data. signals of current transmission, also can be to be this test specific test signal of emission separately specially) received optical power normal value (being normal received energy), the received optical power normal value can be the value of the up luminous power of ONU that receives under the result of calculation (as mean value) of historical received optical power or the ODN link normal condition.OLT measures the luminous power (being the actual reception energy of up test signal) of ONU ascending time slot by integrated power measurement unit, and with the ONU received optical power normal value of preserving relatively, if the optical power value of the ONU ascending time slot that measures is less than the ONU received optical power normal value of preserving, illustrate that decay increases on the optical fiber link at corresponding ONU place, case point occurs on the promptly corresponding optical fiber link.The case point that obtains in conjunction with OLT side OTDR test is apart from the OLT side position, particular location that can decision event point place branch optical fiber.
It will be appreciated by those skilled in the art that, measure and generally can have certain error, therefore can set in advance a allowed band less than degree, if the degree that the actual reception energy is littler than normal received energy is within the described default allowed band, then can think what factor such as measure error caused, therefore not decision event point on the tested optical fiber link; Otherwise,, judge that then described case point is on tested optical fiber link if the actual reception energy degree littler than normal received energy surpassed described default allowed band.
Based on the technical scheme of the foregoing description 6, the present invention also discloses a kind of method embodiment of positioning optical waveguides case point, comprising: determine the distance of case point from optical line terminal OLT; Measure the actual reception energy of described ONU or the up test signal of ONT; Relation between the normal received energy of the actual reception energy of more described up test signal and the up test signal of preserving in advance; Determine that according to described comparative result described case point is whether on described tested optical fiber link, if then according to the distance of described case point from described OLT, determine the position of described case point on described tested optical fiber link.
In addition, based on the technical scheme of the foregoing description 6, the invention also discloses a kind of network equipment, the described network equipment is an optical line terminal OLT, comprising: measuring unit is used to measure the actual reception energy of described ONU or the up test signal of ONT; Judging unit, be used for the actual reception energy of more described up test signal and the normal received energy of the up test signal of preserving in advance between relation, and determine that according to described comparative result described case point is whether on described tested optical fiber link; The case point position determination unit, be used for determining described case point from the distance of described OLT, and when described judging unit determines that described case point is on described tested optical fiber link, determine the position of described case point on described tested optical fiber link from the distance of described OLT according to described case point.Below each embodiment of the invention described above is carried out some supplementary notes.At first, the normal loss of in aforementioned each embodiment, mentioning, difference according to actual conditions can be represented different implications, for example, can be a theoretic normal loss numerical value, also can be the normal loss interval of considering after the factor such as measure error, can also be once at a loss numerical value that optical fiber just often records or the loss interval after considering factor such as measure error or the like.
In addition, when above, downlink data signal during as test signal, when promptly calculating the optical loss of uplink and downlink direction light path by transmission, the received energy of OLT, ONU/ONT measurement uplink and downlink data-signal, because the wavelength of the data-signal of uplink and downlink direction is different in the PON system of single fiber bi-directional, and some incident is different to the influence of different wave length on the optical fiber, during as the serious bending of optical fiber, little to the decay of the short light signal of the attenuation ratio wavelength of the long light signal of ripple.Therefore can also be in conjunction with uplink and downlink direction optical attenuation situation of change (being the relation between the optical loss variable quantity of the optical loss variable quantity of up light path and descending light path), determine certain incident (as bending) whether at OLT on the light path of certain ONU/ONT.In sum, use the technical scheme of the embodiment of the invention, can be implemented in OLT side position monitor network event point, the function of the case point on the branch optical fiber of location greatly reduces cost; Be fit to more and practical application.Simultaneously, use embodiment of the invention technical scheme, even the excessive or disconnected fibre of certain bar fibre loss causes the data of the ONU/ONT side on this branch optical fiber not upload,, also can locate the case point of this branch optical fiber by the mode of getting rid of.
More than a kind of method, optical-fiber network and network equipment of locating the case point of branch optical fiber that the embodiment of the invention provided is described in detail, used specific case herein the principle and the execution mode of the embodiment of the invention are set forth, the explanation of above embodiment just is used for helping to understand the embodiment of the invention; For one of ordinary skill in the art, according to the principle of the embodiment of the invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (20)

1. the method for the case point of a positioning optical waveguides is characterized in that, comprising:
Determine the distance of case point from optical line terminal OLT;
Measure the optical loss of light path between the optical network unit ONU of described OLT and tested optical fiber link opposite end or the Optical Network Terminal ONT;
Determine that according to the optical loss of light path between the ONU of described OLT that measures and tested optical fiber link opposite end or the ONT described case point is whether on described tested optical fiber link, if, then, determine the position of described case point on described tested optical fiber link according to the distance of described case point from described OLT.
2. method according to claim 1 is characterized in that:
The optical loss of light path determines whether described case point is comprising on the described tested optical fiber link between the ONU of described OLT that described basis measures and tested optical fiber link opposite end or the ONT: according to the relation between the normal loss of the optical loss of light path between the ONU of described OLT that measures and tested optical fiber link opposite end or the ONT and described light path, determine that described case point is whether on described tested optical fiber link;
Perhaps,
The optical loss of light path comprises between the ONU of described measurement OLT and tested optical fiber link opposite end or the ONT: measure the optical loss of up light path between the ONU of described OLT and tested optical fiber link opposite end or the ONT and the optical loss of descending light path;
The light loss of light path determines whether described case point comprises at described tested optical fiber link between the ONU of the described OLT that described basis measures and tested optical fiber link opposite end or the ONT: determine the variable quantity of described up light path light loss according to the normal loss of the light loss of up light path between the described OLT that measures and tested optical fiber link opposite end ONU or the ONT and described up light path, and the variable quantity of determining described descending light path light loss according to the normal light loss of the light loss of descending light path between the described OLT that measures and tested optical fiber link opposite end ONU or the ONT and described descending light path; According to the relation between the variable quantity of the variable quantity of the up light path optical loss between described OLT and tested optical fiber link opposite end ONU or the ONT and described descending light path optical loss, determine that described case point is whether on described tested optical fiber link.
3. method according to claim 1, it is characterized in that, the optical loss of light path determines that described case point is whether on described tested optical fiber link between the OLT that described basis measures and tested optical fiber link opposite end ONU or the ONT, if then determine that from the distance of described OLT the position of described case point on described tested optical fiber link comprises according to described case point:
Determine that according to the optical loss of light path between the OLT that measures and tested optical fiber link opposite end ONU or the ONT described case point is whether on the branch optical fiber in described tested optical fiber link, if then determine described case point position on the branch optical fiber in described tested optical fiber link from the distance of described OLT according to described case point.
4. method according to claim 3 is characterized in that, also comprises: the optical loss of measuring trunk optical fiber in the described tested optical fiber link;
The optical loss of light path determines that whether described case point comprises on the branch optical fiber in described tested optical fiber link between the OLT that described basis measures and tested optical fiber link opposite end ONU or the ONT:
According to the optical loss of trunk optical fiber in the optical loss of light path between the described described OLT that measures and tested optical fiber link opposite end ONU or the ONT and the described tested optical fiber link, determine the optical loss of branch optical fiber in the described tested optical fiber link;
According to the relation between the normal loss of the optical loss of branch optical fiber in the described tested optical fiber link that measures and described branch optical fiber, determine that described case point is whether on the branch optical fiber in described tested optical fiber link.
5. method according to claim 3 is characterized in that, also comprises: up optical loss and the descending optical loss of measuring trunk optical fiber in the described tested optical fiber link;
The optical loss of light path comprises between described measurement OLT and tested optical fiber link opposite end ONU or the ONT: measure the optical loss of up light path between described OLT and tested optical fiber link opposite end ONU or the ONT and the optical loss of descending light path;
The optical loss of light path determines that whether described case point comprises on the branch optical fiber in described tested optical fiber link between the OLT that described basis measures and tested optical fiber link opposite end ONU or the ONT:
According to the up optical loss of trunk optical fiber in the optical loss of up light path between the described OLT that measures and tested optical fiber link opposite end ONU or the light ONT and the described tested optical fiber link, determine the up optical loss of branch optical fiber in the described tested optical fiber link;
According to the descending optical loss of trunk optical fiber in the optical loss of descending light path between the described OLT that measures and tested optical fiber link opposite end ONU or the ONT and the described tested optical fiber link, determine the descending optical loss of branch optical fiber in the described tested optical fiber link;
According to the up optical loss of branch optical fiber in the described tested optical fiber link and the normal up optical loss of described branch optical fiber, determine the variable quantity of the up optical loss of branch optical fiber in the described tested optical fiber link; And, according to the descending optical loss of branch optical fiber in the described tested optical fiber link and the normal descending optical loss of described branch optical fiber, determine the variable quantity of the descending optical loss of branch optical fiber in the described tested optical fiber link;
According to the relation between the variable quantity of the variable quantity of the up optical loss of branch optical fiber in the described tested optical fiber link and described descending optical loss, determine that described case point is whether on the branch optical fiber in described tested optical fiber link.
6. according to the method for the case point of each described positioning optical waveguides in the claim 1 to 5, it is characterized in that the optical loss of light path comprises between the ONU of described OLT of described measurement and tested optical fiber link opposite end or the ONT:
Send to the energy of the test signal of light path between described OLT and described ONU or the ONT in the measurement of test signal transmitting terminal; Measure the energy of described test signal at the test signal receiving terminal; According to energy, determine the optical loss of light path between described OLT and described ONU or the ONT in the measured test signal of described test signal transmitting terminal and receiving terminal;
Perhaps,
Send to the energy of the test signal of the light path between described OLT and described ONU or the ONT in the measurement of test signal transmitting terminal; At the test signal receiving terminal with the sending direction of described test signal against described test signal, the described transmitting terminal of reflected back; Measure the energy of the described test signal of returning of being reflected at described transmitting terminal; According to the energy of the energy of the test signal of described transmission and the described test signal of returning of being reflected, determine the optical loss of light path between described OLT and described ONU or the ONT.
7. an optical-fiber network is characterized in that, comprising:
The optical loss measuring unit is used to measure the optical loss of light path between the optical network unit ONU of optical line terminal OLT and tested optical fiber link opposite end or the Optical Network Terminal ONT;
Judging unit is used for the optical loss of light path between the described OLT that measures according to described optical loss measuring unit and tested optical fiber link opposite end ONU or the ONT, determines that case point is whether on described tested optical fiber link;
The case point position determination unit, be used for determining the distance of described case point from described OLT, and when described judging unit determines that described case point is on described tested optical fiber link, determine the position of described case point on described tested optical fiber link from the distance of described OLT according to described case point.
8. optical-fiber network according to claim 7 is characterized in that:
Described judging unit, specifically be used for the optical loss of light path between the described OLT that measures according to described optical loss measuring unit and tested optical fiber link opposite end ONU or the ONT and the relation between the described light path normal loss, determine that case point is whether on described tested optical fiber link;
Perhaps,
The light path optical loss that described optical loss measuring unit is measured comprises the optical loss of up light path and the optical loss of descending light path;
Described judging unit, specifically be used for the optical loss of the up light path that measures according to described optical loss measuring unit and the normal loss of described up light path and determine the optical loss variable quantity of described up light path, and the normal loss that is used for the optical loss of the descending light path that measures according to described optical loss measuring unit and described descending light path is determined the optical loss variable quantity of described descending light path; And then, determine that case point is whether on described tested optical fiber link according to the relation between the optical loss variable quantity of the optical loss variable quantity of described up light path and described descending light path.
9. according to claim 7 or 8 described optical-fiber networks, it is characterized in that described optical loss measuring unit comprises:
Send the energy measurement unit, be used for the energy that transmitting terminal measurement in test signal sends to the test signal of light path between the ONU of described OLT and described tested optical fiber link opposite end or the ONT; The received energy measuring unit is used for measuring the energy that described test signal arrives described receiving terminal at the receiving terminal of described test signal; And computing unit, be used for the energy of the test signal that records according to described transmission energy measurement unit, received energy measuring unit, determine the optical loss of light path between described OLT and described ONU or the ONT;
Perhaps,
Reflector element is used for test signal that the receiving terminal in test signal will arrive described receiving terminal against sending direction, the described transmitting terminal of reflected back; The energy measurement unit, be used for measuring at the transmitting terminal of described test signal the energy of described test signal, the energy of described test signal comprises: send to the energy of the test signal between described OLT and described ONU or the ONT, by the energy of the test signal of the described receiving terminal of described reflector element reflected back; And computing unit, be used for energy according to the energy of the test signal of described transmission and the described test signal of returning of being reflected, determine the optical loss of light path between described OLT and described ONU or the ONT.
10. network equipment, the described network equipment is an optical line terminal OLT, it is characterized in that, comprising:
The optical loss measuring unit is used to measure the optical loss of light path between the optical network unit ONU of described optical line terminal OLT and tested optical fiber link opposite end or the Optical Network Terminal ONT;
Judging unit is used for determining that according to the described light path optical loss that described optical loss measuring unit measures whether case point is at described tested optical fiber link;
The case point position determination unit, be used for determining the distance of described case point and described OLT, and when described judging unit determines that described case point is on described tested optical fiber link, determine the position of described case point on described tested optical fiber link from the distance of described OLT according to described case point.
11. the network equipment according to claim 10 is characterized in that:
Described judging unit specifically is used for the relation between the normal loss of the optical loss of the described light path that measures according to described optical loss measuring unit and described light path, determines that case point is whether on described tested optical fiber link;
Perhaps,
The light path optical loss that described optical loss measuring unit is measured comprises the optical loss of up light path and the optical loss of descending light path; Described judging unit, specifically be used for the optical loss of the up light path that measures according to described optical loss measuring unit and the normal loss of described up light path and determine the optical loss variable quantity of described up light path, and the optical loss variable quantity that is used for determining according to the normal loss of the optical loss of the described descending light path that measures and described descending light path described descending light path; And then, determine that case point is whether on described tested optical fiber link according to the relation between the optical loss variable quantity of the optical loss variable quantity of described up light path and described descending light path.
12. the network equipment according to claim 10 is characterized in that:
Described judging unit specifically is used for determining that according to the optical loss of light path between the OLT that measures and tested optical fiber link opposite end ONU or the ONT described case point is whether at the branch optical fiber of described tested optical fiber link;
Described case point position determination unit, specifically be used for determining the distance of described case point and described OLT, and when described judging unit is determined on the branch optical fiber of described case point in described tested optical fiber link, determine described case point position on the branch optical fiber in described tested optical fiber link from the distance of described OLT according to described case point.
13. the network equipment according to claim 12 is characterized in that,
Described optical loss measuring unit also is used for measuring the optical loss of described tested optical fiber link trunk optical fiber;
Described judging unit comprises:
First module is used for determining the optical loss of branch optical fiber in the described tested optical fiber link according to the optical loss of light path between the described OLT that measures and tested optical fiber link opposite end ONU or the ONT and the optical loss of described tested optical fiber link trunk optical fiber;
Unit second is used for according to the relation between the normal loss of the optical loss of described tested optical fiber link branch optical fiber and described branch optical fiber, determines that described case point is whether on the branch optical fiber in described tested optical fiber link.
14. the network equipment according to claim 12 is characterized in that,
Described optical loss measuring unit also is used for measuring the up optical loss and the descending optical loss of described tested optical fiber link trunk optical fiber;
The optical loss of light path comprises between the OLT that described optical loss measuring unit is measured and tested optical fiber link opposite end ONU or the ONT: the optical loss of up light path and the optical loss of descending light path between described OLT and tested optical fiber link opposite end ONU or the ONT;
Described judging unit comprises:
Unit the 3rd, be used for determining the up optical loss of branch optical fiber in the described tested optical fiber link according to the optical loss of up light path between the described OLT that measures and tested optical fiber link opposite end ONU or the ONT and the up optical loss of described tested optical fiber link trunk optical fiber; And, according to the descending optical loss of trunk optical fiber in the optical loss of descending light path between the described OLT that measures and tested optical fiber link opposite end ONU or the ONT and the described tested optical fiber link, determine the descending optical loss of branch optical fiber in the described tested optical fiber link;
Unit the 4th is used for determining the variable quantity of the up optical loss of branch optical fiber in the described tested optical fiber link according to the up optical loss of described tested optical fiber link branch optical fiber and the normal up optical loss of described branch optical fiber; And, according to the descending optical loss of branch optical fiber in the described tested optical fiber link and the normal descending optical loss of described branch optical fiber, determine the variable quantity of the descending optical loss of branch optical fiber in the described tested optical fiber link;
Unit the 5th is used for according to the relation between the variable quantity of the variable quantity of the up optical loss of described tested optical fiber link branch optical fiber and described descending optical loss, determines that described case point is whether on the branch optical fiber in described tested optical fiber link.
15. the network equipment according to claim 10 is characterized in that, described optical loss measuring unit comprises:
The energy measurement unit is used to measure the energy of test signal, and the energy of wherein said test signal comprises: send to the energy of the test signal of described ONU or ONT side by described OLT side, and the energy of the test signal that reflects by described ONU or ONT; And computing unit, be used for the energy of the test signal that is sent that records according to described energy measurement unit and the energy of the test signal that reflected, determine the optical loss of light path between described OLT and ONU or the ONT;
Perhaps,
The energy measurement unit, be used to measure the energy of test signal, the energy of wherein said test signal is: send to the energy of the test signal of the ONU of tested optical fiber link opposite end or ONT side by described OLT side, or arrived the energy of this OLT by the test signal that the ONU or the ONT side of tested optical fiber link opposite end are sent; The opposite end energy test is acquiring unit as a result, be used to determine energy in the measured test signal in described tested optical fiber link opposite end, the energy of wherein said test signal comprises: described test signal arrives the ONU of described tested optical fiber link opposite end or the energy of ONT side, or, ONU from described tested optical fiber link opposite end, or the ONT side sends to the energy of the test signal of this OLT side in described ONU or ONT side; And computing unit, be used for the energy of the described test signal that records according to described energy measurement unit and the described opposite end energy test energy of the measured test signal in the opposite end that obtains of acquiring unit as a result, determine the optical loss of light path between described OLT and ONU or the ONT.
16. a network equipment, the described network equipment are optical network unit ONU or Optical Network Terminal ONT, it is characterized in that, described ONU or ONT comprise:
Reflection unit is used for when being in open mode the sending direction of received test signal against described test signal, the transmitting terminal of the described test signal of reflected back; And when being in closed condition, not with the transmitting terminal of the received described test signal of test signal reflected back.
17. a network equipment, the described network equipment are optical network unit ONU or Optical Network Terminal ONT, it is characterized in that, described ONU or ONT comprise:
The energy measurement unit is used to measure the energy of test signal, and the energy of wherein said test signal comprises: the energy of the test signal that local terminal sends or from the energy of the received test signal of opposite end OLT;
Transmitting element is used for the measurement result of described energy measurement unit is sent to the OLT that links to each other with this ONU or ONT.
18. an optical-fiber network is characterized in that, comprising:
Each described OLT and claim 16 or 17 described ONU or ONT in the claim 10 to 15.
19. the method for the case point of a positioning optical waveguides is characterized in that, comprising:
Determine the distance of case point from optical line terminal OLT;
Measure the actual reception energy of described ONU or the up test signal of ONT;
Relation between the normal received energy of the actual reception energy of more described up test signal and the up test signal of preserving in advance;
Determine that according to described comparative result described case point is whether on described tested optical fiber link, if then according to the distance of described case point from described OLT, determine the position of described case point on described tested optical fiber link.
20. a network equipment, the described network equipment is an optical line terminal OLT, it is characterized in that, comprising:
Measuring unit is used to measure the actual reception energy of described ONU or the up test signal of ONT;
Judging unit, be used for the actual reception energy of more described up test signal and the normal received energy of the up test signal of preserving in advance between relation, and determine that according to described comparative result described case point is whether on described tested optical fiber link;
The case point position determination unit, be used for determining the distance of described case point and described OLT, and when described judging unit determines that described case point is on described tested optical fiber link, determine the position of described case point on described tested optical fiber link from the distance of described OLT according to described case point.
CN2008100069923A 2007-01-26 2008-01-28 Method for locating case point of branch optical fiber, optical network and network appliance Active CN101232328B (en)

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