CN102388549B - Method, system and device for detecting optical fiber link in passive optical network - Google Patents

Method, system and device for detecting optical fiber link in passive optical network Download PDF

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CN102388549B
CN102388549B CN201180002223.6A CN201180002223A CN102388549B CN 102388549 B CN102388549 B CN 102388549B CN 201180002223 A CN201180002223 A CN 201180002223A CN 102388549 B CN102388549 B CN 102388549B
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onu
optical fiber
olt
fiber link
reflection
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CN102388549A (en
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王运时
万民
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2011/080201 priority Critical patent/WO2012149773A1/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
    • H04B10/27Arrangements for networking
    • H04B10/272Star-type networks or tree-type networks

Abstract

The embodiments of the invention discloses a method for detecting optical fiber link in a passive optical network. The method includes the steps of allocating uplink bandwidth to ONU and allocating idle bandwidth after the uplink bandwidth, wherein the uplink bandwidth receives the uplink optical signal sent from ONU; detecting whether an optical signal matching with the uplink optical signal is received in the idle bandwidth; and determing the occurance of secondary reflection of an optical fiber link between the ONU and OLT according to the detection result. The embodiments of the invention further disclose a system and device for detecting optical fiber link in passive optical network.

Description

The detection method of optical fiber link, system and device in EPON
Technical field
The present invention relates to PON (Passive Optical Network, EPON) technology, relate to especially detection method, system and the device of optical fiber link in EPON.
Background technology
PON generally includes OLT (Optical Line Terminal, optical line terminal), ODN (Optical Distribution Network, light allocation units) and a plurality of ONU (Optical Network Unit, optical network unit).
PON adopts point-to-multipoint mode to connect, and up a plurality of ONU adopt TDMA (Time Division Multiple Access, time division multiple access) working method to share optical transmission medium.Under TDMA pattern, OLT carries out bandwidth authorizing to ONU, concerning ONU, this bandwidth authorizing is its luminous time slot, each ONU has own specific luminous time slot, and under normal circumstances, each ONU only just can send uplink optical signal in distributing to the specific luminous time slot of self.
If it is abnormal that ODN exists optical fiber damage or optical fiber junction to occur, optical fiber link between OLT and ONU may produce reflection end face, if described optical fiber link exists two reflection end faces, the uplink optical signal that certain ONU occurs may form end face secondary reflection and generate secondary reflection light at up direction between described two reflection end faces.As shown in Figure 1, in the luminous time slot that ONU distributes at OLT, send uplink optical signal, when this uplink optical signal runs into end face 0, some can be reflected by end face 0 and generate primary event light at down direction, and when this, primary event light is descending while running into end face 1, can be reflected by end face 1 again and form secondary reflection light, i.e. end face secondary reflection light at up direction.Due under TDMA pattern, the luminous time slot of each ONU is different, when described end face secondary reflection light is just positioned at the luminous time slot of another ONU, end face secondary reflection light may produce and disturb the uplink optical signal of this ONU, thereby cause uplink frame to lose (Loss of Frame, LOF).
OTDR (Optical Time Domain Reflectometer, optical time domain reflectometer) be a kind of conventional optical fiber transmission property checkout equipment, can there is to reflect the transmission characteristic of the reflected signal acquisition optical fiber link returning by detecting test pulse in it, thereby the network failure existing in PON is positioned and analyzed at the case point (such as fusion point, connector, adapter, fibre-optical bending or fracture) of optical fiber link.
But, because OTDR only can locate concrete light case point by reflected signal, and for the secondary reflection problem of the uplink service that whether can exert an influence between two or more case points, rely on OTDR not detect and obtain.Therefore, after adopting OTDR location light case point, generally also need the mode of on-the-spot manual analysis to judge whether the optical fiber link of PON end face secondary reflection occurs, but this detection method need to drop into a large amount of manpower and materials, thus, promote cost, also reduced the efficiency of malfunction elimination.
Summary of the invention
The invention provides detection method, system and the device of optical fiber link in a kind of EPON to reduce cost of labor, promote fault detect efficiency.
In a kind of EPON that the embodiment of the present invention provides, the detection method of optical fiber link, comprises, distributes upstream bandwidth, and configure idle bandwidth to ONU after described upstream bandwidth; At described upstream bandwidth, receive the uplink optical signal that described ONU sends; Whether detection receives the light signal matching with described uplink optical signal in described idle bandwidth, and judges according to testing result whether the optical fiber link between described ONU and OLT occurs end face secondary reflection.
The detection system of optical fiber link in a kind of EPON that the embodiment of the present invention provides, comprises OLT and ONU: described OLT is used for distributing upstream bandwidth to ONU, and configures idle bandwidth after described upstream bandwidth; At described upstream bandwidth, receive the uplink optical signal that described ONU sends, and detect in described idle bandwidth, whether to receive the light signal matching with described uplink optical signal, and judge according to testing result whether the optical fiber link between described ONU and OLT occurs end face secondary reflection;
The upstream bandwidth of described ONU for distributing according to described OLT, sends described uplink optical signal to described OLT.
In a kind of EPON that the embodiment of the present invention provides, the checkout gear of optical fiber link, comprises bandwidth allocation module, for distributing upstream bandwidth to ONU, and configures idle bandwidth after described upstream bandwidth; Receiver module, for receiving at described upstream bandwidth the uplink optical signal that described ONU sends; Detection module, for detection of whether receive the light signal matching with described uplink optical signal in described idle bandwidth, and judges according to testing result whether the optical fiber link between described ONU and OLT occurs end face secondary reflection; Locating module, for according to the testing result of the optical fiber link between each ONU and OLT, to causing the reflection end face of end face secondary reflection to position.
In above-mentioned EPON in the detection method of optical fiber link, system and device, described OLT configures idle bandwidth after distributing to the upstream bandwidth of ONU, and according to the light signal that whether receives the uplink optical signal that sends at described upstream bandwidth with described ONU in described idle bandwidth and match, whether the optical fiber link automatically detecting between ONU and OLT there is end face secondary reflection.Therefore, the detection method that adopts the embodiment of the present invention to provide does not need to carry out field operation, thereby only need carry out simple analysis judgement, has realized when saving human cost, has improved the efficiency of investigation end face secondary reflection.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to be briefly described needed accompanying drawing in embodiment or description of the Prior Art below, clearly, accompanying drawing in the following describes is only explanation and the some embodiments of the present invention of prior art, for the person of ordinary skill of the art, do not paying under the prerequisite of creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the principle schematic that end face secondary reflection produces;
Fig. 2 is the flow chart of the detection method of optical fiber link in the EPON that provides of an embodiment of the present invention;
Fig. 3 is the network architecture schematic diagram of passive optical network;
Fig. 4 is the flow chart of the detection method of optical fiber link in the EPON that provides of the another kind of embodiment of the present invention;
Fig. 5 judges in detection method shown in Fig. 4 whether optical fiber link between ONU and OLT exists the flow chart of end face secondary reflection;
Fig. 6 is the structural representation of the checkout gear of optical fiber link in the EPON that provides of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention; technical solution of the present invention is known intactly and described; obviously; described embodiment is only a part of embodiment of the present invention rather than whole embodiment. based on embodiments of the invention; those of ordinary skill in the art, at other embodiment that do not have to obtain under the prerequisite of creative work, all belongs to protection scope of the present invention.
The embodiment of the present invention provides the detection method of optical fiber link in a kind of EPON, refer to Fig. 2, wherein, optical line terminal (OLT) distributes upstream bandwidth can first to optical network unit (ONU), and configures idle bandwidth after described upstream bandwidth; Described OLT receives at described upstream bandwidth the uplink optical signal that described ONU sends; And described OLT can further detect whether receive the light signal matching with described uplink optical signal in described idle bandwidth, and judge according to testing result whether the optical fiber link between described ONU and OLT occurs end face secondary reflection.
In the EPON that the embodiment of the present invention provides, the detection method of optical fiber link goes for PON as shown in Figure 3.Described passive optical network (PON) 100 can comprise 110, Optical Distribution Networks 120 of at least one optical line terminal (OLT) (ODN) and a plurality of optical network unit (ONU) 130.
Wherein, the direction from described OLT to described ONU is defined as down direction, and direction from described ONU to described OLT is defined as up direction.At down direction, described OLT adopts time division multiplexing (Time Division Multiplexing, TDM) mode that downlink data is broadcast to described a plurality of ONU, and each ONU receives only the data of carrying self identification; And at up direction, described a plurality of ONU adopt mode and the described OLT of time division multiple access TDMA to communicate, the time slot that each ONU distributes in strict accordance with described OLT sends upstream data.Adopt above-mentioned mechanism, the downlink optical signal that described OLT sends is continuous light signal; And the uplink optical signal that described ONU sends is burst luminous signal.
Described passive optical network can be without any need for active device, to realize the communications network system of the Data dissemination between described OLT and described ONU, such as, in specific embodiment, the Data dissemination between described OLT and described ONU can be realized by the Passive Optical Components in described ODN (such as optical splitter).And, described passive optical network 100 can be ITU-T G.984 Ethernet passive optical network (EPON) or the next-generation passive optical network (NGA PON, such as XGPON or 10GEPON etc.) of the gigabit passive optical network of standard definition (GPON) system, IEEE 802.3ah standard definition of the asynchronous transfer mode EPON of standard definition (ATM PON) system or broadband passive optical network (BPON) system, ITU-T G.983.The full content of the various passive optical networks of above-mentioned standard definition is combined in present specification by reference.
Described OLT is usually located at central office (Central Office, CO), its can unified management described in a plurality of ONU, and transmit data between described ONU and upper layer network.Specifically, this OLT can serve as described ONU and described upper layer network (such as internet, PSTN (Public Switched Telephone Network, PSTN) medium between, by the data retransmission receiving from described upper layer network to described ONU, and by the data retransmission receiving from described ONU to described upper layer network.The concrete structure configuration of described OLT may be different because of the particular type of described EPON 100, such as, in one embodiment, described OLT can comprise transmitter and receiver, described transmitter is for sending descending continuous light signal to described ONU, described receiver is for receiving the uplink burst light signal from described ONU, and wherein said downlink optical signal and uplink optical signal can transmit by described Optical Distribution Network.
Described ONU can be arranged on user's side position (such as user resident) by distributed earth.Described ONU can be the network equipment for communicating with described OLT and user, particularly, described ONU can serve as the medium between described OLT and described user, for example, described ONU can be by the data retransmission receiving from described OLT to described user, and by the data retransmission receiving from described user to described OLT.The structure that should be appreciated that described ONU is close with optical-fiber network whole (Optical Network Terminal, ONT), in the scheme therefore providing in present specification, between optical network unit and Optical Network Terminal, can exchange.
Described ODN can be a data distribution systems, and it can comprise optical fiber, optical coupler, optical splitter and/or other equipment.In one embodiment, described optical fiber, optical coupler, optical splitter and/or other equipment can be Passive Optical Components, specifically, described optical fiber, optical coupler, optical splitter and/or other equipment can be that distribute data signals is the device that does not need power supply to support between described OLT and described ONU.Particularly, the optical branching device (Splitter) of take is example, described optical branching device can be connected to described OLT by trunk optical fiber, and by a plurality of branch optical fibers, is connected to described a plurality of ONU respectively, thereby realizes the Point-to-multipoint connection between described OLT and described ONU.In addition, in other embodiments, this ODN can also comprise one or more treatment facilities, for example, and image intensifer or trunking (Relay device).In addition, described ODN specifically can extend to described a plurality of ONU from described optical line terminal 110, but also can be configured to other any point-to-multipoint structures.
In the EPON that an embodiment of the present invention provides, the detection method of optical fiber link can be as shown in Figure 4, and it goes for the PON system shown in Fig. 3, and described method comprises:
Step S300, whether the uplink optical signal that OLT detects from ONU there is uplink frame loss.
When occurring that end face secondary reflection appears in rogue ONU or certain optical fiber link, will there is improper up light in PON system, and described improper up light may cause to disturb and cause occurring uplink frame to the up light of certain or some ONU to be lost.When OLT detects certain ONU, do not have uplink frame to lose, show that the uplink optical fibers chain communication of this ONU is normal; If OLT detects certain ONU, there is uplink frame loss, carry out step S301, start rogue ONU and detect, or directly carry out step S302, start end face secondary reflection and detect.
Step S301, OLT starts rogue ONU and detects, and judges whether PON system exists rogue ONU.
While working under the mode of PON at TDMA, the appearance of rogue ONU also can cause the situation that other ONU uplink frame are lost to occur, so when there is the situation of uplink frame loss in optical fiber link, can first to optical fiber link, carry out rogue ONU detection, if there is rogue ONU in optical fiber link, carry out step S307, further determine rogue ONU.If there is no rogue ONU, carries out step S302.Certainly, step S301 is optional step, also can directly carry out step S302 without this step.
Step S302, OLT starts end face secondary reflection and detects, and one by one to ONU, distributes a upstream bandwidth A, and configure idle bandwidth B after the upstream bandwidth A of described ONU.
For ease of describing, suppose that described PON system comprises N ONU, below the upstream bandwidth A distributing to i ONU (1≤i≤N) is designated as to upstream bandwidth Ai, by being attached to described upstream bandwidth Ai idle bandwidth B afterwards, be designated as Bi.Wherein, described upstream bandwidth Ai meets requirement for the shortest uplink frame of described i ONU, and its length is not less than the length of short uplink frame of described i ONU; The dedicated bandwidth that described idle bandwidth Bi carries out the detection of end face secondary reflection as the optical fiber link between described i ONU and OLT, does not license to any one ONU and carries out up transmission, is not have ONU operable.
In one embodiment, the width of described idle bandwidth Bi can guarantee the uplink optical signal that OLT carries out can not receiving when end face secondary reflection detects other ONU transmissions at the optical fiber link between described i ONU and OLT, the twice time that can be greater than the Optical Fiber Transmission distance of described i ONU such as the length of described idle bandwidth Bi adds the length of the above upstream bandwidth Ai, the twice time of wherein said fiber distance is that the optical fiber link of light signal between described i ONU and OLT transmits the time of twice, such as light comes and goes the time of twice at described optical fiber link.
Step S303, the upstream bandwidth A that ONU distributes according to OLT by the optical fiber link between itself and OLT sends uplink optical signal to OLT.
Step S304, OLT receives at described upstream bandwidth A the uplink optical signal that ONU sends, and by detecting whether receive from the optical fiber link between described ONU and OLT the light signal matching with described uplink optical signal at described idle bandwidth B, judge whether the optical fiber link between described ONU and OLT exists end face secondary reflection.
Particularly, if there is end face secondary reflection in the optical fiber link between described ONU and OLT, such as, there is internal injury or bending in the trunk optical fiber of the ODN between described ONU and OLT or branch optical fiber, or the junction of the public port of trunk optical fiber and OLT or optical splitter is not tight, or the branch port junction of branch optical fiber and ONU or optical splitter is not tight etc., will form at the correspondence position of described optical fiber link reflection end face, if there is plural reflection end face in described optical fiber link, the upward signal that ONU sends will form end face secondary reflection at described reflection end face, reflected signal and described uplink optical signal that wherein said end face secondary reflection forms match, and described reflected light signal will be received by OLT at described idle bandwidth B.
See also Fig. 5, step S304 can specifically comprise:
S304-1, OLT receives from the optical fiber link between described ONU and OLT the uplink optical signal that ONU sends at described upstream bandwidth A.
S304-2, OLT detects whether receive the light signal from the optical fiber link between described ONU and OLT at described up idle bandwidth B, if detect, goes to step S304-3; Otherwise, go to step S304-6.
S304-3, whether the uplink optical signal that OLT judgement receives in described upstream bandwidth A mates with the light signal receiving in described idle bandwidth B, if the two coupling goes to step S304-4; Otherwise, go to step S304-6.
Wherein, OLT is analyzed the uplink optical signal receiving at described upstream bandwidth A and the light signal that receives at described idle bandwidth B, when the two data are identical or the degree of approximation surpasses preset value (such as 95%), thinks that the two matches.
S304-4, judges that light signal that described idle bandwidth B receives is the reflected signal that uplink optical signal that described ONU sends produces at optical fiber link generation end face secondary reflection, and the optical fiber link between described ONU and described OLT exists end face secondary reflection.
S304-5, OLT records the end face secondary reflection testing result of the optical fiber link between described ONU and OLT.
In one embodiment, described end face secondary reflection testing result can comprise whether the optical fiber link between described ONU and OLT the time difference of time of reception and the time that issues of described upstream bandwidth A of the luminous power of the uplink optical signal of end face secondary reflection, described ONU, the uplink optical signal of described ONU and described reflected signal occur.
S304-6, OLT judges that the optical fiber link between described ONU and described OLT does not exist end face secondary reflection.
Step S305, OLT adopts identical detection method, and whether the optical fiber link that one by one detects other ONU and OLT there is end face secondary reflection.
Step S306, after the optical fiber link between all ONU and OLT all carries out the detection of end face secondary reflection one by one, OLT positions the reflection end face of end face secondary reflection according to the end face secondary reflection testing result of the optical fiber link between each ONU and OLT.
Wherein, OLT, after the optical fiber link between all ONU and OLT all carries out the detection of end face secondary reflection one by one, can analyze judgement to the testing result of the optical fiber link between each ONU and OLT.If there is the optical fiber link generation end face secondary reflection between a plurality of ONU or all ONU and OLT, owing to occurring on a plurality of branch optical fibers that in actual PON system the probability of end face secondary reflection is lower simultaneously, so OLT can judge and causes two of end face secondary reflection reflection end faces all on trunk optical fiber.
In addition, each ONU is when sending uplink optical signal, this light signal all has certain luminous power, and while there is end face secondary reflection in the uplink optical fibers link of described ONU, because a part in the uplink optical signal of described ONU reflects at reflection end face, so the luminous power of the uplink optical signal of the described ONU that detects at upstream bandwidth A of OLT can reduce.Therefore, if OLT judges the optical fiber link only having between an ONU and OLT and has end face secondary reflection, analyze the luminous power of the uplink optical signal of this ONU, and the luminous power of the uplink optical signal of the luminous power of described ONU uplink optical signal and other ONU is contrasted, if the luminous power of the uplink optical signal of this ONU is less than other ONU, can judges so in the end face that causes end face secondary reflection and have an end face at least on the branch optical fiber of described ONU.
Should be appreciated that above-mentionedly about end face secondary reflection, to occur in the just preliminary judgement of trunk optical fiber or branch optical fiber, in specific implementation, may need to carry out detection validation in conjunction with other technologies means.In addition, in specific embodiment, OLT can also be according to the distances that time reckoning goes out two reflection end faces of optical fiber link generation end face secondary reflection between described ONU and OLT that issue of the time difference of the time of reception of the uplink optical signal of described ONU and described reflected signal and described upstream bandwidth A, thereby determine the particular location of described reflection end face.
For better understanding above-described embodiment, below in conjunction with at GPON (Gigabit-Capable Passive Optical Network, gigabit passive optical network) application example in, further sets forth the detection method of optical fiber link in the EPON that the embodiment of the present invention provides.
In GPON system, when the optical fiber link between certain ONU and OLT carries out the detection of end face secondary reflection, OLT is used pop-up PLOAM (Physical Layer Operations, Administration and Maintenance, physical layer operations administers and maintains) thus instruction is driven into O4 distance measuring states by ONU provides range finding bandwidth to described ONU, and open the up transmission that sky window suspends all ONU.Thereby use pop-up PLOAM instruction that ONU is driven into O4 distance measuring states one by one, to described ONU, provide this process of range finding bandwidth to be equivalent to ONU, authorize upstream bandwidth A in above-described embodiment, ONU sends ranging response signal according to this range finding bandwidth to OLT; The described sky window of opening is equivalent to after upstream bandwidth A, add an idle bandwidth B in above-described embodiment, does not have ONU can send upward signal during empty window.ONU is after entering O4 distance measuring states, in the described range finding bandwidth of response, to OLT, send ranging response signal, OLT can be in range finding bandwidth detection to described ranging response signal, and judges whether the uplink optical fibers link between this ONU and OLT end face secondary reflection has occurred by detecting whether can receiving another ranging response signal (being that OLT judges whether to receive two ranging response messages) during empty window.
Equally, in above-mentioned GPON, the step of detection fiber link goes for EPON (Ethernet Passive Optical Network, Ethernet passive optical network) and 10GEPON (10 Gigabit-Capable Passive Optical Network, 10 gigabit Ethernet EPONs).
In addition in the EPON that, the embodiment of the present invention provides, the detection method of optical fiber link also can realize in XGPON.In XGPON system, OLT can be by the leading long preambles that is revised as of ONU, only open a bandwidth that PLOAM is up to ONU simultaneously, issue request REGISTRATION_ID (registration ID) acknowledgement messaging to ONU after, whether whether OLT can carry out the uplink that twice REGISTRATION_ID acknowledgement messaging detect between described ONU and OLT according to ONU there is end face secondary reflection.
Visible, in the EPON that the embodiment of the present invention provides, in the detection method of optical fiber link, described OLT distributes a upstream bandwidth to one by one each ONU, and after this bandwidth, configures an idle bandwidth; At described upstream bandwidth, receive the uplink optical signal that ONU sends, whether basis is received to the light signal matching with described uplink optical signal in described idle bandwidth, whether the optical fiber link automatically detecting between ONU and OLT there is end face secondary reflection.Therefore, the detection method that adopts the embodiment of the present invention to provide does not need to carry out field operation, thereby only need carry out simple analysis judgement, has realized when saving human cost, has improved the efficiency of investigation end face secondary reflection.
The detection method of optical fiber link in the EPON providing based on above embodiment, the embodiment of the present invention also further provides the detection system of optical fiber link in a kind of EPON, and described system can adopt the network architecture as shown in Figure 3.
Particularly, in a kind of EPON that the embodiment of the present invention provides, the detection system of optical fiber link can comprise OLT and ONU, and wherein said OLT is connected to described ONU by ODN in point-to-multipoint mode.
Described OLT is used for distributing upstream bandwidth to ONU, and configures idle bandwidth after described upstream bandwidth; At described upstream bandwidth, receive the uplink optical signal that described ONU sends, and detect in described idle bandwidth, whether to receive the light signal matching with described uplink optical signal, and judge according to testing result whether the optical fiber link between described ONU and OLT occurs end face secondary reflection;
The upstream bandwidth of described ONU for distributing according to described OLT, sends described uplink optical signal to described OLT.
In described detection system, particularly, described idle bandwidth can be the dedicated bandwidth for detection of the end face secondary reflection of the optical fiber link between described ONU and OLT, the length of described idle bandwidth can be so that carry out can not receiving when end face secondary reflection detects the uplink optical signal of other ONU transmissions to the optical fiber link between described ONU and OLT, the twice time that is greater than Optical Fiber Transmission distance such as, the length of described idle bandwidth adds the length of the above upstream bandwidth.
In one embodiment, described OLT is detecting in described idle bandwidth, whether to receive the light signal matching with described uplink optical signal, and judge according to testing result whether the optical fiber link between described ONU and OLT occurs in end face secondary reflection process, can detect at described idle bandwidth and whether receive the light signal from the optical fiber link between described ONU and OLT, if receive the light signal from the optical fiber link between described ONU and OLT, whether the light signal that judgement receives in described idle bandwidth matches with described uplink optical signal, wherein said coupling refers to that the identical or data similarity of the data of the two surpasses preset value, if the light signal receiving in described idle bandwidth and described uplink optical signal match, determine that end face secondary reflection appears in the optical fiber link between described ONU and OLT.
In one embodiment, described OLT can also position end face secondary reflection according to the end face secondary reflection testing result of the optical fiber link between each ONU and OLT, and wherein said testing result comprises whether the optical fiber link between described ONU and OLT the luminous power etc. of the uplink optical signal of end face secondary reflection and described ONU occurs.
Such as, described OLT according to the testing result of the optical fiber link between each ONU and OLT to the process that causes the reflection end face of end face secondary reflection and position in, can analyze judgement to the testing result of the optical fiber link between each ONU and OLT, if the optical fiber link between a plurality of ONU and OLT exists end face secondary reflection, judge and cause two end faces of end face secondary reflection all on trunk optical fiber; Or, if described OLT judges the optical fiber link only having between an ONU and OLT and has end face secondary reflection, the luminous power of the uplink optical signal of the luminous power of the uplink optical signal of described ONU and other all ONU is contrasted, if the luminous power of the uplink optical signal of this ONU is not maximum, judges and cause at least one reflection end face of end face secondary reflection at the branch optical fiber of described ONU.
As can be seen from the above description, in a kind of EPON that the embodiment of the present invention provides, the detection system of optical fiber link also can realize and reducing costs, and improves the efficiency of investigation end face secondary reflection.
The detection system of optical fiber link in the passive optical network providing based on above embodiment, the embodiment of the present invention also provides the checkout gear of optical fiber link in a kind of EPON, described checkout gear can be optical line terminal OLT in passive optical network PON or be integrated in OLT inside as the inner function module of OLT, as shown in Figure 6, this checkout gear can comprise bandwidth allocation module 501, receiver module 502 and detection module 503 and locating module 504.
Wherein, bandwidth allocation module 501 for distributing upstream bandwidth to ONU, and configures idle bandwidth after described upstream bandwidth;
Receiver module 502, for receiving at described upstream bandwidth the uplink optical signal that described ONU sends;
Detection module 503, for detection of whether receive the light signal matching with described uplink optical signal in described idle bandwidth, and judges according to testing result whether the optical fiber link between described ONU and OLT occurs end face secondary reflection.
Alternatively, in one embodiment, described OLT can also comprise:
Locating module 504, for according to the testing result of the optical fiber link between each ONU and OLT, to causing the reflection end face of end face secondary reflection to position.
In the checkout gear shown in Fig. 6, particularly, described idle bandwidth can be the dedicated bandwidth for detection of the end face secondary reflection of the optical fiber link between described ONU and OLT, the length of described idle bandwidth can be so that carry out can not receiving when end face secondary reflection detects the uplink optical signal of other ONU transmissions to the optical fiber link between described ONU and OLT, the twice time that is greater than Optical Fiber Transmission distance such as, the length of described idle bandwidth adds the length of the above upstream bandwidth;
In one embodiment, detection module 503 can comprise:
Detecting unit 601, for detection of whether receiving the light signal from the optical fiber link between described ONU and OLT at described upstream bandwidth;
Judging unit 602, for detecting at described detecting unit when described free cells receives the light signal from the optical fiber link between described ONU and OLT, whether the light signal that judgement receives in described idle bandwidth matches with described uplink optical signal, and wherein said coupling refers to that the identical or data similarity of the data of the two surpasses preset value;
Determining unit 603, while matching for judge the light signal that receives at described idle bandwidth and described uplink optical signal at described judging unit, determines whether the optical fiber link between described ONU and OLT occurs end face secondary reflection.
In one embodiment, described testing result can comprise whether optical fiber link between described ONU and OLT the luminous power etc. of the uplink optical signal of end face secondary reflection and described ONU occurs; Wherein, described locating module 504 according to the testing result of the optical fiber link between each ONU and OLT to the process that causes the reflection end face of end face secondary reflection and position in, can analyze judgement specifically for the testing result of the optical fiber link between each ONU and OLT, if the optical fiber link of judging between a plurality of ONU and OLT exists end face secondary reflection, judge and cause two end faces of end face secondary reflection all on trunk optical fiber; If or described locating module 504 is judged the optical fiber link only having between an ONU and OLT and is had end face secondary reflection, the luminous power of the uplink optical signal of the luminous power of the uplink optical signal of described ONU and other all ONU is contrasted, if the luminous power of the uplink optical signal of this ONU is not maximum, judges and cause at least one reflection end face of end face secondary reflection at the branch optical fiber of described ONU.
Should be appreciated that above-mentioned detection device is in the process of optical fiber link detection of carrying out PON, the specific implementation of each functional module and functional unit can be with reference to the description of said method embodiment.By above explanation and embodiment, can find out that the checkout gear of optical fiber link in a kind of EPON that the embodiment of the present invention provides can realize reduction cost of labor, improve the object of detection efficiency.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential hardware platform by software and realize, and can certainly all by hardware, implement.Understanding based on such, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the present invention or embodiment.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (21)

1. a detection method for optical fiber link in EPON, is characterized in that, comprising:
To ONU, distribute upstream bandwidth, and configure idle bandwidth after described upstream bandwidth;
At described upstream bandwidth, receive the uplink optical signal that described ONU sends;
Whether detection receives the light signal from the optical fiber link between described ONU and OLT at described idle bandwidth;
If receive the light signal from the optical fiber link between described ONU and OLT, whether the light signal that judgement receives in described idle bandwidth matches with described uplink optical signal, and wherein said coupling refers to that the identical or data similarity of the data of the two surpasses preset value;
If the light signal receiving and described uplink optical signal match, determine that end face secondary reflection appears in the optical fiber link between described ONU and OLT in described idle bandwidth.
2. the detection method of optical fiber link in EPON as claimed in claim 1, it is characterized in that, described idle bandwidth is the dedicated bandwidth for detection of the end face secondary reflection of the optical fiber link between described ONU and OLT, and the length of described idle bandwidth makes the uplink optical signal that the optical fiber link between described ONU and OLT is carried out can not receiving when end face secondary reflection detects other ONU transmissions.
3. the detection method of optical fiber link in EPON as claimed in claim 2, is characterized in that, the twice time that the length of described idle bandwidth is greater than Optical Fiber Transmission distance adds the length of the above upstream bandwidth.
4. the detection method of optical fiber link in EPON as claimed in claim 1, characterized by further comprising: according to the testing result of the optical fiber link between each ONU and OLT, to causing the reflection end face of end face secondary reflection to position, wherein said testing result comprises whether the optical fiber link between described ONU and OLT the luminous power of the uplink optical signal of end face secondary reflection and described ONU occurs.
5. the detection method of optical fiber link in EPON as claimed in claim 4, is characterized in that, described according to the testing result of the optical fiber link between each ONU and OLT, to causing the reflection end face of end face secondary reflection to position, comprises:
The testing result of the optical fiber link between each ONU and OLT is analyzed to judgement;
If the optical fiber link between a plurality of ONU and OLT exists end face secondary reflection, judge and cause two reflection end faces of end face secondary reflection all on trunk optical fiber.
6. the detection method of optical fiber link in EPON as claimed in claim 4, is characterized in that, described according to the testing result of the optical fiber link between each ONU and OLT, to causing the reflection end face of end face secondary reflection to position, comprises:
The testing result of the optical fiber link between each ONU and OLT is analyzed to judgement;
If only have the optical fiber link between an ONU and OLT to have end face secondary reflection, the luminous power of the uplink optical signal of the luminous power of the uplink optical signal of described ONU and other all ONU is contrasted, if the luminous power of the uplink optical signal of this ONU is not maximum, judges and cause the end face of end face secondary reflection to have a reflection end face at least at the branch optical fiber of described ONU.
7. the detection method of optical fiber link in the EPON as described in any one in claim 1 to 6, is characterized in that:
Described upstream bandwidth is for being urged to described ONU the range finding bandwidth that distance measuring states offers described ONU, described idle bandwidth is for suspending the empty window of the up transmission of all ONU, and described uplink optical signal is the ranging response signal that described ONU sends to described OLT after being driven to distance measuring states;
Wherein, whether described detection receives the light signal matching with described uplink optical signal in described idle bandwidth, and judges according to testing result whether the optical fiber link between described ONU and OLT occurs that end face secondary reflection comprises:
After receiving the ranging response signal of described ONU, detect during described empty window, whether to receive another ranging response signal of described ONU, if received, there is end face secondary reflection in the optical fiber link of judging between described ONU and OLT.
8. a detection system for optical fiber link in EPON, is characterized in that, comprises OLT and a plurality of ONU:
Described OLT is used for distributing upstream bandwidth to ONU, and configures idle bandwidth after described upstream bandwidth; At described upstream bandwidth, receive the uplink optical signal that described ONU sends, and detect whether receive the light signal from the optical fiber link between described ONU and OLT at described idle bandwidth;
If receive the light signal from the optical fiber link between described ONU and OLT, whether the light signal that judgement receives in described idle bandwidth matches with described uplink optical signal, and wherein said coupling refers to that the identical or data similarity of the data of the two surpasses preset value;
If the light signal receiving and described uplink optical signal match, determine that end face secondary reflection appears in the optical fiber link between described ONU and OLT in described idle bandwidth;
The upstream bandwidth of described ONU for distributing according to described OLT, sends described uplink optical signal to described OLT.
9. the detection system of optical fiber link in EPON as claimed in claim 8, it is characterized in that, described idle bandwidth is the dedicated bandwidth for detection of the end face secondary reflection of the optical fiber link between described ONU and OLT, and the length of described idle bandwidth makes the uplink optical signal that the optical fiber link between described ONU and OLT is carried out can not receiving when end face secondary reflection detects other ONU transmissions.
10. the detection system of optical fiber link in EPON as claimed in claim 9, is characterized in that, the twice time that the length of described idle bandwidth is greater than Optical Fiber Transmission distance adds the length of the above upstream bandwidth.
The detection system of optical fiber link in 11. EPONs as claimed in claim 8, it is characterized in that, described OLT is also for according to the testing result of the optical fiber link between each ONU and OLT, to causing the reflection end face of end face secondary reflection to position, wherein said testing result comprises whether the optical fiber link between described ONU and OLT the luminous power of the uplink optical signal of end face secondary reflection and described ONU occurs.
In 12. EPONs as claimed in claim 11, the detection system of optical fiber link, is characterized in that, described OLT analyzes judgement to the testing result of the optical fiber link between each ONU and OLT;
If the optical fiber link between a plurality of ONU and OLT exists end face secondary reflection, judge and cause two end faces of end face secondary reflection all on trunk optical fiber.
In 13. EPONs as claimed in claim 11, the detection system of optical fiber link, is characterized in that, described OLT analyzes judgement to the testing result of the optical fiber link between each ONU and OLT;
If only have the optical fiber link between an ONU and OLT to have end face secondary reflection, the luminous power of the uplink optical signal of the luminous power of the uplink optical signal of described ONU and other all ONU is contrasted, if the luminous power of the uplink optical signal of this ONU is not maximum, judges and cause at least one reflection end face of end face secondary reflection at the branch optical fiber of described ONU.
The detection system of optical fiber link in 14. EPONs as described in any one in claim 8 to 13, is characterized in that:
Described upstream bandwidth is for being urged to described ONU the range finding bandwidth that distance measuring states offers described ONU, described idle bandwidth is for suspending the empty window of the up transmission of all ONU, and described uplink optical signal is the ranging response signal that described ONU sends to described OLT after being driven to distance measuring states;
Wherein, described OLT is after receiving the ranging response signal of described ONU, whether detection receives another ranging response signal of described ONU during described empty window, if received, end face secondary reflection appears in the optical fiber link of judging between described ONU and OLT.
In 15. 1 kinds of EPONs, the checkout gear of optical fiber link, is characterized in that, comprising:
Bandwidth allocation module for distributing upstream bandwidth to ONU, and configures idle bandwidth after described upstream bandwidth;
Receiver module, for receiving at described upstream bandwidth the uplink optical signal that described ONU sends;
Detecting unit, for detection of whether receiving the light signal from the optical fiber link between described ONU and OLT at described upstream bandwidth;
Judging unit, for detecting at described detecting unit when described free cells receives the light signal from the optical fiber link between described ONU and OLT, whether the light signal that judgement receives in described idle bandwidth matches with described uplink optical signal, and wherein said coupling refers to that the identical or data similarity of the two data surpasses preset value;
Determining unit, while matching for judge the light signal that receives at described idle bandwidth and above-mentioned uplink optical signal at described judging unit, determines whether the optical fiber link between described ONU and OLT occurs end face secondary reflection.
The checkout gear of optical fiber link in 16. EPONs as claimed in claim 15, it is characterized in that, described idle bandwidth is the dedicated bandwidth for detection of the end face secondary reflection of the optical fiber link between described ONU and OLT, and the length of described idle bandwidth makes the uplink optical signal that the optical fiber link between described ONU and OLT is carried out can not receiving when end face secondary reflection detects other ONU transmissions.
In 17. EPONs as claimed in claim 16, the checkout gear of optical fiber link, is characterized in that, the twice time that the length of described idle bandwidth is greater than Optical Fiber Transmission distance adds the length of the above upstream bandwidth.
The checkout gear of optical fiber link in 18. EPONs as claimed in claim 15, it is characterized in that, also comprise locating module, be used for according to the testing result of the optical fiber link between each ONU and OLT, to causing the reflection end face of end face secondary reflection to position, wherein said testing result comprises whether the optical fiber link between described ONU and OLT the luminous power of the uplink optical signal of end face secondary reflection and described ONU occurs.
In 19. EPONs as claimed in claim 18, the checkout gear of optical fiber link, is characterized in that, described locating module is analyzed judgement to the testing result of the optical fiber link between each ONU and OLT;
If the optical fiber link between a plurality of ONU and OLT exists end face secondary reflection, judge and cause two reflection end faces of end face secondary reflection all on trunk optical fiber.
In 20. EPONs as claimed in claim 18, the checkout gear of optical fiber link, is characterized in that, described locating module is analyzed judgement to the testing result of the optical fiber link between each ONU and OLT;
If only have the optical fiber link between an ONU and OLT to have end face secondary reflection, the luminous power of the uplink optical signal of the luminous power of the uplink optical signal of described ONU and other all ONU is contrasted, if the luminous power of the light signal that this ONU is up is not maximum, judges and cause the end face of end face secondary reflection to have a reflection end face at least on the branch optical fiber of described ONU.
The checkout gear of optical fiber link in 21. EPONs as claimed in claim 15, is characterized in that:
Described upstream bandwidth is for being urged to described ONU the range finding bandwidth that distance measuring states offers described ONU, described idle bandwidth is for suspending the empty window of the up transmission of all ONU, and described uplink optical signal is the ranging response signal that described ONU sends to described OLT after being driven to distance measuring states;
Wherein, described detection module is after receiving the ranging response signal of described ONU, whether detection receives another ranging response signal of described ONU during described empty window, if received, end face secondary reflection appears in the optical fiber link of judging between described ONU and OLT.
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