CN103036615B - Optical time domain detector optical module and gigabit passive optical network breakpoint detection system - Google Patents

Optical time domain detector optical module and gigabit passive optical network breakpoint detection system Download PDF

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CN103036615B
CN103036615B CN201210555629.3A CN201210555629A CN103036615B CN 103036615 B CN103036615 B CN 103036615B CN 201210555629 A CN201210555629 A CN 201210555629A CN 103036615 B CN103036615 B CN 103036615B
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optical
interface
signal
laser
optical fiber
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CN103036615A (en
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张洪铭
张强
金成浩
赵其圣
杨思更
何鹏
薛登山
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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Abstract

The invention discloses a kind of OTDR optical module and GPON breakpoint detection system.This system comprises: optical line terminal OLT, optical splitter, optical network unit ONU and optical time domain detector optical module, and OLT is connected with optical time domain detector optical module, and optical time domain detector optical module is connected with optical splitter; Optical time domain detector optical module, for receiving the light signal of the first wave length that OLT exports, is transmitted through optical splitter; Receive the light signal of the second wave length that ONU exports, be transmitted through OLT; Generate the light signal of three-wavelength, export, the light signal of the three-wavelength that reception Rayleigh scattering and Fresnel reflection return, carries out signal transacting, obtains breakpoint information according to signal processing results.Application the present invention, can simplify the normal transmission of breaking point detection flow process, safeguards system network signal.<pb pnum="1" />

Description

Optical time domain detector optical module and gigabit passive optical network breakpoint detection system
Technical field
The present invention relates to Fibre Optical Communication Technology, particularly relate to a kind of optical time domain detector (OTDR, OpticalTime Domain Reflectometer) optical module and gigabit passive optical network (GPON, GigabitPassive Optical Network) breakpoint detection system.
Background technology
Current domestic market and international market, the optical fiber communication direction of merging with multiple business with a large bandwidth and at a high rate has started application; In numerous solutions, the appearance of fiber to the home (FTTH, FiberTo The Home) is considered to the ultimate solution of broadband access, and domestic market is large-area applications.
And in the numerous scheme of FTTH, wherein GPON receives much concern again, become the soft exchange mode of current main flow.In GPON system, the transmission medium of light, as optical fiber/optical cable, often be laid on countryside or seabed, unavoidably because the problem such as link failure or transmission equipment fault appears in transmission link breakpoint, break down or the position of breakpoint to can accurately locate, usually adopt optical time domain reflectometer (OTDR, Optical Time Domain Reflectometer) optical module to carry out breaking point detection.Wherein, OTDR is the backscattering that produces of Rayleigh scattering when utilizing light to transmit in a fiber and Fresnel reflection and the optoelectronic integration instrument made, can be widely used among the maintenance of lightguide cable link, construction, the measurement of fiber lengths, the transmission attenuation of optical fiber, joint decay and fault location etc. can be carried out.
Fig. 1 is existing Gbit passive optical network system structural representation.See Fig. 1, this system comprises: optical line terminal (OLT, Optical Line Terminator), optical splitter (Splitter) and optical network unit (ODU, Optical Net Unit), wherein,
OLT is arranged on the central office of the access net system of optical fiber telecommunications system usually, OLT is responsible for that the electrical signal data in external switch is converted into optical signal data and is sent to optical splitter, and receive the light signal that optical splitter sends, be translated into the signal of telecommunication and flow to outside switch;
OLT is connected by Splitter and ONU, and ONU is arranged on local side usually, i.e. user side or building; Splitter generally has 2N to divide equally interface, if the light intensity of input interface is 1, then the light intensity of each output interface is 1/N.
For a Gbit passive optical network system (multi-plexing light accessing system), be generally that an OLT is placed on telecommunication center office, then by optical splitter, be at least generally 1 point 32, namely an OLT is by optical splitter, and band 32ONU forms Gbit passive optical network system.
In Fig. 1, be three, suppose between OLT to spliter for ONU quantity have the optical fiber that one section of 10km is long, the distance that to be the distance between 1km, spliter to ONU2 be between 2km, spilter to ONU3 of the distance between spliter to ONU1 is 10km.
Suppose that the optical fiber between spilter to ONU3 there occurs fibercuts at 7km place, then will the optical fiber link between OLT to ONU3 be broken down, need to adopt OTDR technology to carry out breaking point detection, to detect the position of guilty culprit in time, safeguard.
Fig. 2 is existing gigabit passive optical network breakpoint detection system structural representation.See Fig. 2, this system comprises: OTDR, optical splitter (Splitter) and optical network unit (ODU, Optical NetUnit), wherein, relative to the Gbit passive optical network system shown in Fig. 1, when carrying out the breaking point detection of optical time domain, need to disconnect the connection between OLT and optical fiber, OTDR is linked in GPON system, namely substitutes OLT with OTDR, and be connected with spliter by optical fiber.OTDR, by the pulse of emission interface utilizing emitted light, is outputted in optical fiber, is transmitted by Splitter to ONU.
When light pulse is transmitted in optical fiber, can due to the character of optical fiber itself and connector, junction point, bend or other similar event and produce scattering, reflection, wherein a part of scattered light and reverberation turn back in OTDR by optical fiber, the useful information returned is measured by the detector in OTDR, and as the time on diverse location in optical fiber or curve segment, by the analysis of time or curve segment, the particular location of breakpoint can be determined.That is, OTDR uses Rayleigh scattering and Fresnel reflection to characterize the characteristic of optical fiber, wherein, Rayleigh scattering is formed because light signal produces irregular scattering along optical fiber, these backscatter signals indicate decay (loss/distance) degree caused by optical fiber, thus, by measuring a part of scattered light turning back to OTDR receiving interface, decay (loss/distance) degree of optical fiber can be obtained; Fresnel reflection is discrete reflection, and it is caused by the indivedual points in whole piece optical fiber, and these points are by the factor causing reverse parameter to change, and on these aspects, have very strong back-scattering light and are reflected back.Therefore, OTDR, by utilizing the information of Rayleigh scattering and Fresnel reflection, can be located by connecting a little, fibre-optic terminus or breakpoint.
From above-mentioned, existing GPON breakpoint detection system of carrying out breakpoints of optical fiber detection based on optical time domain detector, in the process of carrying out breaking point detection, need first to disconnect existing GPON system, then OTDR is accessed breakpoint detection system, enter optical fiber by the pulse of OTDR utilizing emitted light, utilize the Rayleigh scattering of light pulse and the information of Fresnel reflection to detect, breaking point detection flow process is comparatively complicated; Further, between detection period, need to disconnect OLT, thus have influence on the normal transmission that other does not have the network signal at breakpoint place.Such as, in above-mentioned example, the optical fiber between spilter to ONU3 there occurs fibercuts, between detection period, needs OLT to open from network interruption, thus the signal transmitting and receiving causing ONU1, ONU2 interrupts, and affects the normal operation of GPON system; And when GPON system often breaks down, need the operation frequently carrying out disconnecting OLT and grafting OLT, grafting frequently, makes the functional reliability of OLT reduce.
In sum, the GPON breakpoint detection system of prior art, carrying out in breaking point detection process, testing process is comparatively complicated, and can have influence on the normal transmission that other does not have the network signal at breakpoint place.
Summary of the invention
The embodiment provides a kind of OTDR optical module, simplify the normal transmission of breaking point detection flow process, safeguards system network signal.
Embodiments of the invention additionally provide a kind of GPON breakpoint detection system, simplify the normal transmission of breaking point detection flow process, safeguards system network signal.
According to an aspect of the present invention, provide a kind of OTDR optical module, comprising: optical path component, generating laser, laser detector, breaking point detection module and signal of telecommunication sample circuit, wherein,
Optical path component, optical fiber for being connected with exterior light line terminal OLT by built-in uplink optical fibers interface is connected, the optical fiber be connected with outside optical splitter by built-in downlink optical fiber interface is connected, be connected with generating laser by built-in Laser emission interface, be connected with laser detector by built-in laser pick-off interface;
Generating laser, for when carrying out breaking point detection, generating the light signal of the three-wavelength for detecting breakpoint, exporting the Laser emission interface of optical path component to;
Laser detector, for receiving the light signal of the three-wavelength exported from the laser pick-off interface of optical path component, being converted to the corresponding signal of telecommunication by the light signal of the three-wavelength received and exporting;
Signal of telecommunication sample circuit, for being connected with laser detector, sampling to the signal of telecommunication that laser detector exports, obtaining digital signal, and send to breaking point detection module;
Breaking point detection module, for receiving the digital signal that signal of telecommunication sample circuit sends, analyzes, by analysis result with to obtain in advance carry out analyzing the result obtained without sampling during breakpoint and compare, acquisition breakpoint or position of failure point.
Preferably,
The light signal of the first wave length that described optical path component is exported by optical fiber by the outside OLT of uplink optical fibers interface, is transmitted through optical fiber by downlink optical fiber interface and transfers to outside optical splitter; The light signal of the second wave length exported by optical fiber by the outside optical network unit ONU of downlink optical fiber interface, is transmitted through optical fiber by uplink optical fibers interface and transfers to described OLT;
By the light signal of the three-wavelength of Laser emission interface laser transmitter projects, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports laser pick-off interface to, and exports laser detector to by laser pick-off interface.
Preferably, described signal of telecommunication sample circuit is after the signal of telecommunication receiving laser detector output, and the signal of telecommunication be further used for receiving amplifies and filtering process.
Preferably, described optical path component comprises: wavelength division multiplexer and circulator, wherein,
WDM, the light signal of the first wave length exported by optical fiber by built-in uplink optical fibers interface OLT, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU, is transmitted through optical fiber by uplink optical fibers interface and transfers to OLT;
Received the light signal of the three-wavelength that circulator exports by built-in reflective interface, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports reflective interface to, and exports circulator to by reflective interface;
Circulator, for being received the light signal of the three-wavelength of laser transmitter projects by built-in first interface, exports the reflective interface of WDM to by the second built-in interface; The light signal of the three-wavelength of the reflection exported by the reflective interface of the second interface WDM, and export laser detector to by built-in laser pick-off interface.
Preferably, described optical path component comprises the filter be arranged between the laser pick-off interface of circulator and laser detector further, and described filter is used for the light signal of the three-wavelength that the anti-reflection laser pick-off interface from circulator exports.
Preferably, described generating laser comprises: laser emission element and drive circuit unit, wherein,
Drive circuit unit, for when breaking point detection is carried out in startup, driving laser transmitter unit launches the laser of three-wavelength, exports the first interface of circulator to.
Preferably, described generating laser comprises further:
Control unit, for after the breaking point detection instruction receiving external equipment, generate the breaking point detection signal of telecommunication, and export drive circuit unit to, to make drive circuit unit according to the breaking point detection signal of telecommunication received, driving laser transmitter unit launches the laser of three-wavelength.
Preferably, described laser emission element is the distributed feedback laser transmitting illuminant of 1625nm.
Preferably, described laser detector comprises: photodiode and trans-impedance amplifier TIA, wherein,
Photodiode, for receiving after the light signal of laser pick-off interface output, exports corresponding response current to TIA;
TIA, for receiving response current, the response current according to receiving exports corresponding differential electric signal to signal of telecommunication sample circuit.
Preferably, described photodiode is avalanche photodide.
Preferably, described signal of telecommunication sample circuit comprises:
Analog-digital Converter adc circuit, samples for the signal of telecommunication exported laser detector, and sends to breaking point detection module to store the digital signal obtained of sampling.
Preferably, described signal of telecommunication sample circuit comprises amplifying circuit further, and amplifying circuit is placed between laser detector and adc circuit, amplifies the signal of telecommunication that laser detector exports.
Preferably, described breaking point detection module comprises: detection signal memory cell, comparing unit, normal operation signal memory cell and breakpoint location determining unit, wherein,
Detection signal memory cell, for storing the digital signal that adc circuit exports when detected state;
Normal operation signal memory cell, for storing the digital signal that gigabit passive optical network breakpoint detection system obtains when normal operating condition;
Comparing unit, for the digital signal of the digital signal and normal operation signal cell stores that compare detection signal cell stores, exports comparative result;
Breakpoint location determining unit, analyzes for the comparative result exported comparing unit, obtains the position of breakpoint or fault point.
Preferably, described breaking point detection module is field programmable gate array, programmable logic array, single-chip microcomputer, processor or micro controller.
A kind of gigabit passive optical network breakpoint detection system, this system comprises: optical line terminal OLT, optical splitter and optical network unit ONU, and wherein, described OLT launches the light signal of first wave length, and receives the light signal of the second wave length that described ONU launches; Described gigabit passive optical network breakpoint detection system also comprises: optical time domain detector optical module,
OLT is connected with optical time domain detector optical module, and optical time domain detector optical module is connected with optical splitter;
Optical time domain detector optical module, for receiving the light signal of the first wave length that OLT exports, is transmitted through optical splitter; Receive the light signal of the second wave length that ONU exports, be transmitted through OLT; Generate the light signal of three-wavelength, export, the light signal of the three-wavelength that reception Rayleigh scattering and Fresnel reflection return, carries out signal transacting, obtains breakpoint information according to signal processing results.
Preferably, described optical time domain detector optical module comprises: optical path component, generating laser, laser detector, breaking point detection module and signal of telecommunication sample circuit, wherein,
Optical path component, optical fiber for being connected with OLT by built-in uplink optical fibers interface is connected, the optical fiber be connected with optical splitter by built-in downlink optical fiber interface is connected, and is connected with generating laser by built-in Laser emission interface, is connected with laser detector by built-in laser pick-off interface;
Generating laser, for when carrying out breaking point detection, generating the light signal of the three-wavelength for detecting breakpoint, exporting the Laser emission interface of optical path component to;
Laser detector, for receiving the light signal of the three-wavelength exported from the laser pick-off interface of optical path component, being converted to the corresponding signal of telecommunication by the light signal of the three-wavelength received and exporting;
Signal of telecommunication sample circuit, for being connected with laser detector, sampling to the signal of telecommunication that laser detector exports, obtaining digital signal, and send to breaking point detection module;
Breaking point detection module, for receiving the digital signal that signal of telecommunication sample circuit sends, analyzes, by analysis result with to obtain in advance carry out analyzing the result obtained without sampling during breakpoint and compare, acquisition breakpoint or position of failure point.
Preferably,
The light signal of the first wave length that described optical path component is exported by optical fiber by uplink optical fibers interface OLT, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU, is transmitted through optical fiber by uplink optical fibers interface and transfers to described OLT;
By the light signal of the three-wavelength of Laser emission interface laser transmitter projects, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports laser pick-off interface to, and exports laser detector to by laser pick-off interface.
Preferably, described optical path component comprises: wavelength division multiplexer and circulator, wherein,
WDM, the light signal of the first wave length exported by optical fiber by built-in uplink optical fibers interface OLT, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU, is transmitted through optical fiber by uplink optical fibers interface and transfers to OLT;
Received the light signal of the three-wavelength that circulator exports by built-in reflective interface, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports reflective interface to, and exports circulator to by reflective interface;
Circulator, for being received the light signal of the three-wavelength of laser transmitter projects by built-in first interface, exports the reflective interface of WDM to by the second built-in interface; The light signal of the three-wavelength of the reflection exported by the reflective interface of the second interface WDM, and export laser detector to by built-in laser pick-off interface.
Preferably, described optical path component comprises the filter be arranged between the laser pick-off interface of circulator and laser detector further, and described filter is used for the light signal of the three-wavelength that the anti-reflection laser pick-off interface from circulator exports.
Preferably, described generating laser comprises: laser emission element and drive circuit unit, wherein,
Drive circuit unit, for when breaking point detection is carried out in startup, driving laser transmitter unit launches the laser of three-wavelength, exports the first interface of circulator to.
Preferably, described generating laser comprises further:
Control unit, for after the breaking point detection instruction receiving external equipment, generate the breaking point detection signal of telecommunication, and export drive circuit unit to, to make drive circuit unit according to the breaking point detection signal of telecommunication received, driving laser transmitter unit launches the laser of three-wavelength.
Preferably, described laser detector comprises: photodiode and trans-impedance amplifier TIA, wherein,
Photodiode, for receiving after the light signal of laser pick-off interface output, exports corresponding response current to TIA;
TIA, for receiving response current, the response current according to receiving exports corresponding differential electric signal to signal of telecommunication sample circuit.
Preferably, described signal of telecommunication sample circuit comprises:
Analog-digital Converter adc circuit, samples for the signal of telecommunication exported laser detector, and sends to breaking point detection module to store the digital signal obtained of sampling;
Amplifying circuit, amplifying circuit is placed between laser detector and adc circuit, amplifies the signal of telecommunication that laser detector exports.
Preferably, described breaking point detection module comprises: detection signal memory cell, comparing unit, normal operation signal memory cell and breakpoint location determining unit, wherein,
Detection signal memory cell, for storing the digital signal that adc circuit exports when detected state;
Normal operation signal memory cell, for storing the digital signal that gigabit passive optical network breakpoint detection system obtains when normal operating condition;
Comparing unit, for the digital signal of the digital signal and normal operation signal cell stores that compare detection signal cell stores, exports comparative result;
Breakpoint location determining unit, analyzes for the comparative result exported comparing unit, obtains the position of breakpoint or fault point.
From above-mentioned, the OTDR optical module of the embodiment of the present invention and GPON breakpoint detection system, this system comprises: optical line terminal OLT, optical splitter, optical network unit ONU and optical time domain detector optical module, OLT is connected with optical time domain detector optical module, and optical time domain detector optical module is connected with optical splitter; Optical time domain detector optical module, for receiving the light signal of the first wave length that OLT exports, is transmitted through optical splitter; Receive the light signal of the second wave length that ONU exports, be transmitted through OLT; Generate the light signal of three-wavelength, export, the light signal of the three-wavelength that reception Rayleigh scattering and Fresnel reflection return, carries out signal transacting, obtains breakpoint information according to signal processing results.Like this, when carrying out breaking point detection, without the need to disconnecting OLT, thus normal service communication in GPON can not be affected, on the basis of safeguards system network signal normal transmission, simplifying breaking point detection flow process; Further, due to without the need to frequently carrying out the operation disconnecting OLT and grafting OLT, decreasing OLT grafting frequently, improve the functional reliability of OLT.
Accompanying drawing explanation
Fig. 1 is existing Gbit passive optical network system structural representation.
Fig. 2 is existing gigabit passive optical network breakpoint detection system structural representation.
Fig. 3 is embodiment of the present invention gigabit passive optical network breakpoint detection system structural representation.
Fig. 4 is the structural representation of embodiment of the present invention optical time domain detector optical module.
Fig. 5 is the schematic diagram that embodiment of the present invention gigabit passive optical network breakpoint detection system carries out detecting.
Fig. 6 is the digital signal waveform schematic diagram be stored in breaking point detection module.
Fig. 7 is the schematic diagram of digital signal waveform and the distance calculated based on Fig. 6.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in specification are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
The term such as " module " used in this application, " system " is intended to comprise the entity relevant to computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.Such as, module can be, but be not limited in: the thread of the process that processor runs, processor, object, executable program, execution, program and/or computer.For example, application program computing equipment run and this computing equipment can be modules.One or more module can be positioned at an executory process and/or thread, and module also and/or can be distributed on a computer between two or more platform computers.
Existing GPON breakpoint detection system, in the process of carrying out breaking point detection, need first to disconnect OLT, then OTDR is accessed breakpoint detection system and carry out breaking point detection, after detection, then disconnect OTDR, and OLT connecting system is carried out proper communication, make breaking point detection flow process comparatively complicated, and have influence on the normal transmission of network signal.
In the embodiment of the present invention, a kind of online OTDR optical module is proposed, breaking point detection is carried out when not disconnecting OLT, by the series connection of this OTDR optical module is accessed Gbit passive optical network system, the downlink optical signals that OLT is exported and the uplink optical signal being transferred to OLT carry out transparent transmission, by utilizing emitted light signal, and the OTDR that the optical signals receiving the transmitting of OTDR optical module returns in scattering and reflection detects light, carry out breakpoint analysis, by breakpoint analysis result feedback to system, and have cheap, simple to operate, support hot plug, easy replacing, the advantages such as maintenance.
Fig. 3 is embodiment of the present invention gigabit passive optical network breakpoint detection system structural representation.See Fig. 3, this system comprises: optical line terminal (OLT) 301, optical splitter (spliter) 302, optical time domain detector optical module 303 and optical network unit (ONU) 304, wherein, OLT301, optical splitter 302 and optical network unit ONU 304 are identical with ONU with OLT, spliter in the PON system of prior art respectively;
OLT301 is connected with optical time domain detector optical module 303, and optical time domain detector optical module 303 is connected with optical splitter 302, and optical splitter 302 is connected with one or more ONU304, and namely optical time domain detector optical module 303 is connected in series between OLT301 and spliter302.Specifically, OLT301 is connected with optical time domain detector optical module 303 by optical fiber, and optical time domain detector optical module 303 is connected with optical splitter 302 by optical fiber, and optical splitter 302 is connected with one or more ONU304 by optical fiber.
Preferably, the position of optical time domain detector optical module 303 in gigabit passive optical network breakpoint detection system is closer to OLT301 place.
OLT301, for launching the light signal (downlink communication light signal) of first wave length, entering optical time domain detector optical module 303 through optical fiber, being transmitted through optical splitter 302 by optical time domain detector optical module 303; Received the light signal (uplink communication light signal) of the second wave length of optical time domain detector optical module 303 transmission by optical fiber, process;
In the embodiment of the present invention, the light signal of the first wave length of transmitting is transmitted through the fiber to the uplink optical fibers interface of optical time domain detector optical module 303 by OLT301, and enter optical fiber through the downlink optical fiber interface of optical time domain detector optical module 303, in a fiber after transmission, arrive optical splitter 302; Received the light signal of the second wave length of the uplink optical fibers interface transmission of optical time domain detector optical module 303 by optical fiber, process.
In the embodiment of the present invention, OLT301 is for the concrete handling process of light signal, same as the prior art, specifically see relate art literature, can not repeat them here.
Optical time domain detector optical module 303, for receiving the light signal of the first wave length that OLT301 exports, is transmitted through optical splitter 302; Receive the light signal of the second wave length that ONU304 exports, be transmitted through OLT301; Generate the light signal of three-wavelength, export, the light signal of the three-wavelength that reception Rayleigh scattering and Fresnel reflection return, carries out signal transacting, obtains breakpoint information according to signal processing results;
In the embodiment of the present invention, optical time domain detector optical module 303 judges the light signal received, to determine whether, for the light signal of the light signal of first wave length, the light signal of second wave length or three-wavelength, specifically see relate art literature, not repeat them here.
The light signal of the three-wavelength returned by Rayleigh scattering and Fresnel reflection, can be by light signal that Rayleigh scattering and Fresnel reflection return on the communication link between optical time domain detector optical module 303 and optical splitter 302, also can be by light signal that Rayleigh scattering and Fresnel reflection return on optical splitter 302, also can be the light signal that the communication link between optical splitter 302 and ONU304 is returned by Rayleigh scattering and Fresnel reflection, can also be by light signal that Rayleigh scattering and Fresnel reflection return on ONU304.
Optical splitter 302, for receiving the light signal that optical time domain detector optical module 303 exports, carrying out light-splitting processing, exporting the one or more ONU304 be connected with self respectively to; Receive the light signal of the second wave length that ONU304 generates, carry out interflow process, export optical time domain detector optical module 303 to; Receive the light signal of the three-wavelength by Rayleigh scattering and Fresnel reflection, carry out process of confluxing, export optical time domain detector optical module 303 to;
In the embodiment of the present invention, optical splitter 302 for carrying out light-splitting processing to the downlink optical signal being sent to ONU304, and, the uplink optical signal received is confluxed process, exports optical time domain detector optical module 303 to.
ONU304, for being received the light signal of first wave length by optical fiber, after processing, is generated the light signal of second wave length, exports optical splitter 302 to; Receive the light signal of three-wavelength, export the light signal of the three-wavelength by Rayleigh scattering and Fresnel reflection to optical splitter 302 by optical fiber.
In the embodiment of the present invention, ONU304 receives the light signal of first wave length by optical fiber, after processing, generates the detailed process of the light signal of second wave length, belongs to prior art, specifically can see relate art literature.
If ONU304 receives the light signal of three-wavelength by optical fiber, show that the communication link between optical time domain detector optical module 303 and ONU304 is normal; If optical time domain detector optical module 303 exports the light signal of three-wavelength, and ONU304 does not receive the light signal of three-wavelength, show that the communication link between optical time domain detector optical module 303 and ONU304 there occurs exception.
In the embodiment of the present invention, OLT301 launches the light signal (downlink communication light signal) of first wave length, enter the optical fiber between OLT301 and optical time domain detector optical module 303, in a fiber after transmission, arrive the uplink optical fibers interface of optical time domain detector optical module 303, after the transmission of optical time domain detector optical module 303, the optical fiber between optical time domain detector optical module 303 and optical splitter 302 is entered from the downlink optical fiber interface of optical time domain detector optical module 303, in a fiber after transmission, enter optical splitter 302, after the light-splitting processing of optical splitter 302, enter the optical fiber between optical splitter 302 and ONU304, finally arrive ONU304, after the light signal of ONU304 to the first wave length received processes, launch the light signal (uplink communication light signal) of second wave length, by optical splitter 302, optical fiber between optical splitter 302 and optical time domain detector optical module 303, enter the downlink optical fiber interface of optical time domain detector optical module 303, after the transmission of optical time domain detector optical module 303, optical fiber is entered from the uplink optical fibers interface of optical time domain detector optical module 303, in a fiber after transmission, arrive OLT301, the light signal that OLT301 receives second wave length processes, the light signal (downlink communication light signal) of first wave length is launched according to optical signal prosessing result, circulation like this, until flow process terminates,
Optical time domain detector optical module 303 is when carrying out breaking point detection, by the light signal of its downlink optical fiber interface Transmission three-wavelength, and the optical fiber sequentially between optical time domain detector optical module 303 and optical splitter 302, optical splitter 302, optical fiber between optical splitter 302 and ONU304 and the link of ONU304 carry out optical signal transmission, if there occurs breakpoint in above-mentioned link, the light signal of three-wavelength is then reflected from breakpoint, and it is reverse through above-mentioned link, arrive the downlink optical fiber interface of optical time domain detector optical module 303, the light signal of the three-wavelength of the downlink optical fiber interface reflection of optical time domain detector optical module 303, sample after the light signal of the three-wavelength of reflection is converted to the signal of telecommunication, analog-to-digital conversion, obtain digital signal, by sampling, the digital signal obtained stores, analyze, thus judge breakpoint or position of failure point.
In practical application, optical time domain detector optical module 303 starts and carries out breaking point detection, can be that OLT301 is after the light signal launching first wave length, if do not receive the light signal of the second wave length of the light signal in response to first wave length within the time pre-set, by sending trigger message to optical time domain detector optical module 303, trigger startup optical time domain detector optical module 303 and carry out breaking point detection, also can be the light signal that three-wavelength is launched in optical time domain detector optical module 303 timing, the light signal according to the three-wavelength of reflection carries out breakpoint fault detection.Certainly, can also be trigger startup by alternate manner to carry out breaking point detection.
Arrange all kinds of detected parameters about in optical time domain detector optical module 303, such as, optical fibre refractivity n, light pulse wavelength etc., specifically see relate art literature, can not repeat them here.
Preferably, optical time domain detector optical module 303 is formed waveform, and is analyzed by this waveform after analyzing according to the back-scattering light feedack of optical fiber diverse location in LCDs, thus knows the position that optical fiber breaks down.
It should be noted that, the three-wavelength of the light signal that optical time domain detector optical module 303 is launched only otherwise identical with the light signal of first wave length and the light signal (up-downgoing light wave) of second wave length, such as, the conventional descending optical wavelength of 10G is the up optical wavelength of 1577nm, 2.5G is 1270nm; The descending optical wavelength of 2.5G is the up optical wavelength of 1490nm, 1G is 1310nm.In order to not affect regular traffic, the optical wavelength being used for OTDR breaking point detection is selected to be 1625nm.
In the embodiment of the present invention, transmission refers to that optical time domain detector optical module 303 is as transponder, does not do any process, be forwarded to next receiving element to the light signal received.
As can be seen from above-mentioned, be serially connected with the optical time domain detector optical module 303 between OLT301 and optical splitter 302, can signal of communication in transmission GPON system, such as, the light signal of the light signal of the downlink communication of first wave length and the uplink communication of second wave length, thus in the flow process of breaking point detection, realize the transmission of communication data, make the existence of optical time domain detector optical module 303, the communication of existing GPON system can not be affected.
Fig. 4 is the structural representation of embodiment of the present invention optical time domain detector optical module.See Fig. 4, this optical module comprises: optical path component 401, generating laser 402, laser detector 403, breaking point detection module 405, signal of telecommunication sample circuit 404, wherein,
Optical path component 401, optical fiber for being connected with OLT301 by built-in uplink optical fibers interface is connected, the optical fiber be connected with optical splitter 302 by built-in downlink optical fiber interface is connected, be connected with generating laser 402 by built-in Laser emission interface, be connected with laser detector 403 by built-in laser pick-off interface;
Specifically, optical path component 401, the light signal of the first wave length exported by optical fiber by uplink optical fibers interface OLT301, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter 302; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU304, is transmitted through optical fiber by uplink optical fibers interface and transfers to OLT301;
The light signal of the three-wavelength launched by Laser emission interface generating laser 402, is exported to downlink optical fiber interface, and is exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports laser pick-off interface to, and exports laser detector 403 to by laser pick-off interface.
In the embodiment of the present invention, optical path component 401 comprises four interfaces, be respectively: uplink optical fibers interface, downlink optical fiber interface, Laser emission interface and laser pick-off interface, wherein, uplink optical fibers interface is connected with optical fiber respectively with downlink optical fiber interface, namely uplink optical fibers interface is connected with OLT301 by optical fiber, and downlink optical fiber interface is connected with optical splitter 302 by optical fiber; The light signal of the three-wavelength that optical path component 401 is launched by Laser emission interface generating laser 402, the light signal of the three-wavelength launched by generating laser 402 after being coupled outputs to optical fiber from downlink optical fiber interface and transmits.
In the embodiment of the present invention, the light signal of three-wavelength transmits in the optical fiber of GPON system, at the breakaway poing of optical fiber or equipment (such as, optical splitter and ONU) fault place or other fault place reflected, transmitted in a fiber by the light signal of the three-wavelength reflected, after turning back to optical path component 401, the light signal of the three-wavelength that optical path component 401 reflects from downlink optical fiber interface, after light-splitting processing, the light signal of the three-wavelength of reflection is outputted to laser detector 403 by laser pick-off interface.
Generating laser 402, for when carrying out breaking point detection, generating the light signal of the three-wavelength for detecting breakpoint, exporting the Laser emission interface of optical path component 401 to;
In the embodiment of the present invention, generating laser 402, when carrying out breaking point detection, can be that the pulse electrical signal of fixed cycle is carried out electro-optic conversion, generates the light signal of three-wavelength and launch.
Laser detector 403, for receiving the light signal of the three-wavelength exported from the laser pick-off interface of optical path component 401, being converted to the corresponding signal of telecommunication by the light signal of the three-wavelength received and exporting;
In the embodiment of the present invention, the light signal of the three-wavelength that laser detector 403 receives is reflected signal, this reflected signal can reflect the breakpoint location in network fiber, the light signal of reflection is being converted to the signal of telecommunication and after sampling, analysis is being carried out to the digital signal of sampling and can judge breakpoint or position of failure point.
Signal of telecommunication sample circuit 404, for being connected with laser detector 403, sampling to the signal of telecommunication that laser detector 403 exports, obtaining digital signal, and send to breaking point detection module 405;
In the embodiment of the present invention, signal of telecommunication sample circuit 404 can also amplify and filtering process the signal of telecommunication that laser detector 403 exports, and samples to the signal of telecommunication after amplification and filtering process again, exports the digital signal of sampling.
Breaking point detection module 405, for receiving the digital signal that signal of telecommunication sample circuit 404 sends, analyzes, by analysis result with to obtain in advance carry out analyzing the result obtained without sampling during breakpoint and compare, acquisition breakpoint or position of failure point.
In the embodiment of the present invention, the digital signal that breaking point detection module 405 can also be used for the signal of telecommunication sample circuit 404 of reception sends stores.
Breaking point detection module 405 receives and the digital signal stored according to from signal of telecommunication sample circuit 404, generate the first waveform, comparing with the second waveform generated according to the digital signal obtained without sampling during breakpoint prestored, judging breakpoint or position of failure point according to comparison result.Certainly, in practical application, also can compare according to the digital signal received and the digital signal prestored, the digital signal prestored is under normal circumstances, namely when without breakpoint, fault-free point, to the sampled digital signal that the light signal of the three-wavelength of reflection is sampled and obtained after analog-to-digital conversion.
The external pin of optical time domain detector optical module 303 specifically can comprise:
SDA pin, i.e. serial communication line data pin;
SCL pin, i.e. serial communication line clock pins;
GND and VCC pin.
Particularly, SDA pin is connected with breaking point detection module 405 with SCL pin, and control unit 1202 is communicated with external equipment with SCL pin by SDA pin.
The electrical interface of the external pin of optical time domain detector optical module 303 can adopt the 4pin structure of contact pin type.
In the embodiment of the present invention, by analysis result with to obtain in advance carry out analyzing the result obtained without sampling during breakpoint and compare, acquisition breakpoint or position of failure point are prior art, specifically see relate art literature, can not repeat them here.Only simply introduce principle herein.
Fig. 5 is the schematic diagram that embodiment of the present invention gigabit passive optical network breakpoint detection system carries out detecting.See Fig. 5, suppose between optical time domain detector optical module and optical splitter, have the optical fiber of a segment length 10km, distance between optical splitter and ONU1 is 1km, distance between optical splitter and ONU2 is 2km, and the distance between optical splitter and ONU3 is 10km, but there occurs fibercuts at 7km place.
When carrying out breaking point detection (communication service can normally perform), the light signal of 1625nm wavelength launched by the generating laser 402 of optical time domain detector optical module, export the Laser emission interface of optical path component 401 to, Laser emission interface exports the light signal of the 1625nm wavelength of reception to downlink optical fiber interface, and export optical splitter to by downlink optical fiber interface, after carrying out light-splitting processing by optical splitter, export respectively, when optical signal transmission to the spacing of optical splitter and ONU3 of 1625nm wavelength is 7km place, fibercuts, the light signal of breaking part reflection 1625nm wavelength, optical splitter is returned through fiber reflection, optical splitter is after reflow treatment, transfer to optical time domain detector optical module, the downlink optical fiber interface light signal of optical time domain detector optical module, and determine that the light signal received is the light signal of 1625nm wavelength, export laser pick-off interface to, and export laser detector 403 to by laser pick-off interface,
The light signal of reception is converted to the signal of telecommunication by laser detector 403, and is sampled as digital signal through signal of telecommunication sample circuit 404, is stored in breaking point detection module 405.
Fig. 6 is the digital signal waveform schematic diagram be stored in breaking point detection module.See Fig. 6, abscissa is the time, ordinate is received optical power (dbm), suppose after the luminescence of optical time domain detector optical module, receive the reflection peak of each light signal respectively at T1 ~ T4 time point, then the distance of each reverberation place distance light road terminal optical module obtains according to following formulae discovery:
d = c &times; T 2 2 &times; n
In formula,
C=3 × 10 8m/s is the light velocity;
N is the refractive index of fiber core;
D is the numerical value calculated, i.e. the distance of distance light road, reverberation place terminal optical module.
Fig. 7 is the schematic diagram of digital signal waveform and the distance calculated based on Fig. 6.See Fig. 7, abscissa is the distance of distance light road, reverberation place terminal optical module, ordinate is received optical power (dbm), as can be seen from the signal waveform shown in Fig. 7, at distance optical time domain detector optical module 10km place, due to the reflection of optical splitter, detect a Fei Nier reflection peak, at distance optical time domain detector optical module 11km place, detect the reflection peak of ONU1, at distance optical time domain detector optical module 12km place, detect the reflection peak of ONU2, at distance optical time domain detector optical module 17km place, detect the reflection peak at reverberation place (fibercuts place).
Comparison system layout, the i.e. signal waveform of normal condition, what namely obtain in advance carries out analyzing the result obtained without sampling during breakpoint: at distance optical time domain detector optical module 10km place, due to the reflection of optical splitter, detect a reflection peak, at distance optical time domain detector optical module 11km place, due to the reflection of ONU1, detect the reflection peak of ONU1, at distance optical time domain detector optical module 12km place, due to the reflection of ONU2, detect the reflection peak of ONU2, at distance optical time domain detector optical module 20km place, due to the reflection of ONU3, detect the reflection peak of ONU3.
Thus, can judge, due in the signal waveform shown in Fig. 7, not comprise the reflection peak of ONU3, thus, determine that breakpoint has appearred in the link between optical splitter to ONU3, this breakpoint distance optical time domain detector optical module 17km.
Wherein,
Optical path component 401 comprises: wavelength division multiplexer (WDM, Wavelength DivisionMultiplex) 411 and circulator 412, wherein,
WDM411 has three interfaces, is respectively common interface (com interface), transmission interface (Pass interface) and reflective interface (Reflect interface).Wherein, the com interface of WDM411 is as the downlink optical fiber interface incoming fiber optic of optical path component 401, and the Pass interface of WDM411 is as the uplink optical fibers interface incoming fiber optic of optical path component 401, and the Reflect interface of WDM411 is connected with circulator 412;
WDM411, the light signal of the first wave length exported by optical fiber by uplink optical fibers interface OLT301, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter 302; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU304, is transmitted through optical fiber by uplink optical fibers interface and transfers to OLT301;
The light signal of the three-wavelength exported by Reflect interface circulator 412, is exported to downlink optical fiber interface, and is exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports Reflect interface to, and exports circulator 412 to by Reflect interface;
In the embodiment of the present invention, in order to the light wave of the descending light of 1490nm, the up light of 1310nm and 1625nm is carried out light path coupling, introduce WDM and realize this function.The light signal of downlink optical fiber interface second wave length of WDM411 and the light signal of three-wavelength, carry out the detailed process of wavelength division multiplexing, specifically see relate art literature, can not repeat them here.
Circulator 412 has three interfaces, is respectively first interface, the second interface, the 3rd interface;
Second interface of circulator 412 is connected with the Reflect interface of WDM411; Such as, the second interface of circulator 412 can be connected by optical fiber with the Reflect interface of WDM411, or two interfaces are directly connected.
The first interface of circulator 412 and the 3rd interface, respectively as Laser emission interface and the laser pick-off interface of optical path component 401;
Circulator 412, for the light signal of the three-wavelength by the transmitting of Laser emission interface generating laser 402, exports the Reflect interface of WDM411 to by the second interface; The light signal of the three-wavelength of the reflection exported by the Reflect interface of the second interface WDM411, and export laser detector 403 to by laser pick-off interface.
In the embodiment of the present invention, circulator 412 is for being separated utilizing emitted light with reverberation, and the laser of the 1625nm namely sent by generating laser 402, is inputted by first interface, is exported by the second interface; The detection light (reverberation) of the 1625nm inputted by the second interface, is exported by the 3rd interface, flows to laser detector 403.
The light signal of the three-wavelength that generating laser 402 is launched enters the circulator 412 of optical path component 401 through the first interface (first interface) of circulator 412, from the second interface injection of circulator 412; The light signal of the three-wavelength reflected from optical fiber, com interface through WDM411 enters optical path component 401, and output to circulator 412 from the Reflect interface of WDM411, after the light signal of the three-wavelength of the reflection that the second interface of circulator 412 is injected from the Reflect interface of WDM411, the 3rd interface through circulator 412 enters optical fiber, transfers to laser detector 403.
Preferably, because the light intensity of reverberation is very little, in order to avoid system-level spuious wavelength is on the impact of OTDR sensitivity, the filter 413 be arranged between the 3rd interface of circulator 412 and laser detector 403 also can be comprised in optical path component 401, by increasing filter before laser detector 403, the optical wavelength of anti-reflection 1625nm, and barrier effect is risen to the optical wavelength of below 1610nm.
In the embodiment of the present invention, filter 413 is the anti-reflection sheet of three-wavelength light signal, for the light signal of the three-wavelength of anti-reflection the 3rd interface output from circulator 412, and the spuious wavelength in shielding system.
In practical application, in order to realize above-mentioned function, the com interface of WDM411 is the interface that can transmit all band light signal, and its Pass interface is can the interface of first and second wavelength channels of transmission, and its Reflect interface is the interface of reflection three-wavelength light signal.Such as, above-mentioned first wave length is specially 1490nm; Second wave length is 1310nm; Three-wavelength is 1625nm, then Pass Interface design is the interface of the following wavelength channels of transmission 1580nm, and Reflect Interface design is the interface of the wavelength channels of reflection more than 1610nm.The specific targets of WDM411 are as shown in table 1 below:
Table 1
In table 1, Pass->Com represents that light wave enters from PASS mouth, and com port goes out; Two-way can by represent light wave both can enter from PASS mouth, com port goes out, and also can enter from com port, and PASS mouth goes out.
Wherein, insertion loss requires little as far as possible, reduces the loss of system with bottom line; The height that insulated degree requirement is tried one's best, to reduce crosstalk, to improve the sensitivity of system.
Generating laser 402 comprises: laser emission element and drive circuit unit (not shown), wherein,
Drive circuit unit, for when breaking point detection is carried out in startup, driving laser transmitter unit launches the laser of three-wavelength, exports the first interface of circulator to.
In the embodiment of the present invention, laser emission element can be specifically distributed feedback laser (DFB, the Distribute FeedBack Laser) transmitting illuminant of 1625nm, light pulse signal is converted into burst transmissions light signal.
In practical application, generating laser 402 can also comprise:
Control unit, for after the breaking point detection instruction receiving external equipment, generate the breaking point detection signal of telecommunication, and export drive circuit unit to, to make drive circuit unit according to the breaking point detection signal of telecommunication received, driving laser transmitter unit launches the laser of three-wavelength.
Laser detector 403 comprises: photodiode and trans-impedance amplifier (TIA, Tranimpedance Amplifier) (not shown), wherein,
Photodiode, for receiving after the light signal of laser pick-off interface output, exports corresponding response current to TIA;
TIA, for receiving response current, the response current according to receiving exports corresponding differential electric signal to signal of telecommunication sample circuit 404.
In the embodiment of the present invention, photodiode can be specifically the avalanche photodide (APD, Avalanche Photo Diode) in optical module.
Signal of telecommunication sample circuit 404 comprises: Analog-digital Converter (ADC, Analog to DigitalConverter) circuit,
Adc circuit, samples for the signal of telecommunication exported laser detector 403, and sends to breaking point detection module 405 to store the digital signal obtained of sampling.
In the embodiment of the present invention, preferably, signal of telecommunication sample circuit 404 can also comprise amplifying circuit, amplifying circuit is placed between laser detector 403 and adc circuit, the signal of telecommunication that laser detector 403 exports is amplified, to make adc circuit sample to the signal of telecommunication after amplifying circuit amplification, by sampling, the digital signal obtained sends to breaking point detection module 405 to store.
Breaking point detection module 405 comprises: detection signal memory cell, comparing unit, normal operation signal memory cell and breakpoint location determining unit (not shown), wherein,
Detection signal memory cell, for storing the digital signal that adc circuit exports when detected state;
Normal operation signal memory cell, for storing the digital signal that gigabit passive optical network breakpoint detection system obtains when normal operating condition;
Comparing unit, for the digital signal of the digital signal and normal operation signal cell stores that compare detection signal cell stores, exports comparative result;
Breakpoint location determining unit, analyzes for the comparative result exported comparing unit, obtains the position of breakpoint or fault point.
In the embodiment of the present invention, breakpoint location determining unit can also be further used for exporting the positional information of the breakpoint judged or fault point to pre-set external equipment.
In practical application, breaking point detection module 405 can be specifically realized by logic array circuit, such as, and field programmable gate array (FPGA, Field Programmable Gata Array), the circuit realiration such as programmable logic array (PAL, Programmable Array Logic); Or, also can be realized by the such as computing chip such as single-chip microcomputer, processor, micro controller.Namely breaking point detection module 405 can be FPGA, PAL, single-chip microcomputer, processor or micro controller.
When carrying out breaking point detection, FPGA is arranged on the program in flash memory (Flash), transmission is used for the pulse signal (in Fig. 4 shown in dotted line) of breaking point detection to drive circuit unit, drive circuit unit driving laser transmitter unit, the electric impulse signal sent by FPGA is converted into the light pulse signal of 1625nm; The light signal be reflected back in system is through the photoelectric conversion of APD detector, light signal is converted into current signal, and then through transimpedance amplifier (TIA, Transimpedance Amplifier) conversion and the process of amplifier, input to adc circuit, flow to FPGA after analog signal is changed into digital signal, FPGA carries out analysis and calculation to the digital signal received, and determines breakpoint location.
In practical application, the electrical interface of optical time domain detector optical module 303 can adopt the 10pin structure of combined testing action group (JTAG, Joint Test Action Group) interface, and wherein 4pin is respectively for I 2sDA, I of C data 2the SCL of C clock, for the GND of earth connection with for providing the VCC of power supply, 6pin is debug circuit use in addition, and communicated with external system analytical equipment by jtag interface, system passes through I 2c bus communication mode reads the data of FPGA, thus determines breakpoints of optical fiber position.
Specifically:
In GPON system, the Distributed Feedback Laser being arranged in GPON OLT 1490nm uses as the light source of down link, send the signal of continuous 2.488Gbps, the APD detector being arranged in GPON OLT 1310nm receives the uplink burst light bag sent by ONU, carries out data receiver.
When OTDR optical module (optical time domain detector optical module) is sealed in system, the Distributed Feedback Laser of built-in 1625nm sends a series of burst laser, breakpoint in optical fiber link, due to Rayleigh scattering and Fresnel reflection, understand some return loss light and be reflected back optical fiber, and then return the APD detector of 1625nm built-in in optical time domain detector optical module.The APD detector of 1625nm receives the light reflected, and through photoelectric conversion, forms current signal, then through amplifier process and ADC sampling, as digital signal transfers to FPGA.The signal under normal circumstances that the signal received and Flash are deposited by FPGA compares, and find the position that breakpoint occurs, namely relative to the signal peak had more under normal signal, the position that this peak value is corresponding is the position of breakpoint, passes through I 2c bus reads the data of FPGA, learns the position that breakpoint occurs.
From above-mentioned, the gigabit passive optical network breakpoint detection system of the embodiment of the present invention, by optical time domain detector optical module being connected into the OLT in gigabit passive optical network breakpoint detection system and between optical splitter, and optical time domain detector optical module can transmission communicating light signal (light signal of first wave length and the light signal of second wave length), and launch breaking point detection light signal (light signal of three-wavelength), light signal according to the three-wavelength of reflection carries out breaking point detection, determines breakpoint location.Making when carrying out breaking point detection, without the need to disconnecting the OLT in existing GPON system, thus the normal communications signal in EPON can not be affected, simplifying breaking point detection flow process, having ensured the normal transmission of grid signal; Further, optical time domain detector optical module is in breakpoint analysis, the equipment of optical time domain reflectometer can be saved, circuit cost is lower, compared with traditional optical time domain reflectometer, there is the advantages such as cheap, simple to operate, easy care, thus achieve the breaking point detection of passive optical network with low cost; And, due to without the need to frequently carrying out the operation disconnecting OLT and grafting OLT, decreasing OLT grafting frequently, improve the functional reliability of OLT.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (24)

1. an optical time domain detector optical module, is characterized in that, this optical time domain detector optical module comprises: optical path component, generating laser, laser detector, breaking point detection module and signal of telecommunication sample circuit, wherein,
Optical path component, optical fiber for being connected with exterior light line terminal OLT by built-in uplink optical fibers interface is connected, the optical fiber be connected with outside optical splitter by built-in downlink optical fiber interface is connected, be connected with generating laser by built-in Laser emission interface, be connected with laser detector by built-in laser pick-off interface;
Generating laser, for when carrying out breaking point detection, generating the light signal of the three-wavelength for detecting breakpoint, exporting the Laser emission interface of optical path component to;
Laser detector, for receiving the light signal of the three-wavelength exported from the laser pick-off interface of optical path component, being converted to the corresponding signal of telecommunication by the light signal of the three-wavelength received and exporting;
Signal of telecommunication sample circuit, for being connected with laser detector, sampling to the signal of telecommunication that laser detector exports, obtaining digital signal, and send to breaking point detection module;
Breaking point detection module, for receiving the digital signal that signal of telecommunication sample circuit sends, analyzes, by analysis result with to obtain in advance carry out analyzing the result obtained without sampling during breakpoint and compare, acquisition breakpoint or position of failure point.
2. optical time domain detector optical module as claimed in claim 1, is characterized in that,
The light signal of the first wave length that described optical path component is exported by optical fiber by the outside OLT of uplink optical fibers interface, is transmitted through optical fiber by downlink optical fiber interface and transfers to outside optical splitter; The light signal of the second wave length exported by optical fiber by the outside optical network unit ONU of downlink optical fiber interface, is transmitted through optical fiber by uplink optical fibers interface and transfers to described OLT;
By the light signal of the three-wavelength of Laser emission interface laser transmitter projects, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports laser pick-off interface to, and exports laser detector to by laser pick-off interface.
3. optical time domain detector optical module as claimed in claim 2, is characterized in that, described signal of telecommunication sample circuit is after the signal of telecommunication receiving laser detector output, and the signal of telecommunication be further used for receiving amplifies and filtering process.
4. the optical time domain detector optical module as described in any one of claims 1 to 3, is characterized in that, described optical path component comprises: wavelength division multiplexer and circulator, wherein,
WDM, the light signal of the first wave length exported by optical fiber by built-in uplink optical fibers interface OLT, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU, is transmitted through optical fiber by uplink optical fibers interface and transfers to OLT;
Received the light signal of the three-wavelength that circulator exports by built-in reflective interface, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports reflective interface to, and exports circulator to by reflective interface;
Circulator, for being received the light signal of the three-wavelength of laser transmitter projects by built-in first interface, exports the reflective interface of WDM to by the second built-in interface; The light signal of the three-wavelength of the reflection exported by the reflective interface of the second interface WDM, and export laser detector to by built-in laser pick-off interface.
5. optical time domain detector optical module as claimed in claim 4, it is characterized in that, described optical path component comprises the filter be arranged between the laser pick-off interface of circulator and laser detector further, and described filter is used for the light signal of the three-wavelength that the anti-reflection laser pick-off interface from circulator exports.
6. optical time domain detector optical module as claimed in claim 5, it is characterized in that, described generating laser comprises: laser emission element and drive circuit unit, wherein,
Drive circuit unit, for when breaking point detection is carried out in startup, driving laser transmitter unit launches the laser of three-wavelength, exports the first interface of circulator to.
7. optical time domain detector optical module as claimed in claim 6, it is characterized in that, described generating laser comprises further:
Control unit, for after the breaking point detection instruction receiving external equipment, generate the breaking point detection signal of telecommunication, and export drive circuit unit to, to make drive circuit unit according to the breaking point detection signal of telecommunication received, driving laser transmitter unit launches the laser of three-wavelength.
8. optical time domain detector optical module as claimed in claim 6, it is characterized in that, described laser emission element is the distributed feedback laser transmitting illuminant of 1625nm.
9. optical time domain detector optical module as claimed in claim 8, it is characterized in that, described laser detector comprises: photodiode and trans-impedance amplifier TIA, wherein,
Photodiode, for receiving after the light signal of laser pick-off interface output, exports corresponding response current to TIA;
TIA, for receiving response current, the response current according to receiving exports corresponding differential electric signal to signal of telecommunication sample circuit.
10. optical time domain detector optical module as claimed in claim 9, it is characterized in that, described photodiode is avalanche photodide.
11. optical time domain detector optical modules as claimed in claim 9, it is characterized in that, described signal of telecommunication sample circuit comprises:
Analog-digital Converter adc circuit, samples for the signal of telecommunication exported laser detector, and sends to breaking point detection module to store the digital signal obtained of sampling.
12. optical time domain detector optical modules as claimed in claim 11, it is characterized in that, described signal of telecommunication sample circuit comprises amplifying circuit further, and amplifying circuit is placed between laser detector and adc circuit, amplifies the signal of telecommunication that laser detector exports.
13. optical time domain detector optical modules as claimed in claim 4, it is characterized in that, described breaking point detection module comprises: detection signal memory cell, comparing unit, normal operation signal memory cell and breakpoint location determining unit, wherein,
Detection signal memory cell, for storing the digital signal that adc circuit exports when detected state;
Normal operation signal memory cell, for storing the digital signal that gigabit passive optical network breakpoint detection system obtains when normal operating condition;
Comparing unit, for the digital signal of the digital signal and normal operation signal cell stores that compare detection signal cell stores, exports comparative result;
Breakpoint location determining unit, analyzes for the comparative result exported comparing unit, obtains the position of breakpoint or fault point.
14. optical time domain detector optical modules as claimed in claim 13, it is characterized in that, described breaking point detection module is field programmable gate array, programmable logic array, single-chip microcomputer, processor or micro controller.
15. 1 kinds of gigabit passive optical network breakpoint detection system, this system comprises: optical line terminal OLT, optical splitter and optical network unit ONU, and wherein, described OLT launches the light signal of first wave length, and receives the light signal of the second wave length that described ONU launches; It is characterized in that, described gigabit passive optical network breakpoint detection system also comprises: optical time domain detector optical module,
OLT is connected with optical time domain detector optical module, and optical time domain detector optical module is connected with optical splitter;
Optical time domain detector optical module, for receiving the light signal of the first wave length that OLT exports, is transmitted through optical splitter; Receive the light signal of the second wave length that ONU exports, be transmitted through OLT; Generate the light signal of three-wavelength, export, the light signal of the three-wavelength that reception Rayleigh scattering and Fresnel reflection return, carries out signal transacting, obtains breakpoint information according to signal processing results.
16. systems as claimed in claim 15, it is characterized in that, described optical time domain detector optical module comprises: optical path component, generating laser, laser detector, breaking point detection module and signal of telecommunication sample circuit, wherein,
Optical path component, optical fiber for being connected with OLT by built-in uplink optical fibers interface is connected, the optical fiber be connected with optical splitter by built-in downlink optical fiber interface is connected, and is connected with generating laser by built-in Laser emission interface, is connected with laser detector by built-in laser pick-off interface;
Generating laser, for when carrying out breaking point detection, generating the light signal of the three-wavelength for detecting breakpoint, exporting the Laser emission interface of optical path component to;
Laser detector, for receiving the light signal of the three-wavelength exported from the laser pick-off interface of optical path component, being converted to the corresponding signal of telecommunication by the light signal of the three-wavelength received and exporting;
Signal of telecommunication sample circuit, for being connected with laser detector, sampling to the signal of telecommunication that laser detector exports, obtaining digital signal, and send to breaking point detection module;
Breaking point detection module, for receiving the digital signal that signal of telecommunication sample circuit sends, analyzes, by analysis result with to obtain in advance carry out analyzing the result obtained without sampling during breakpoint and compare, acquisition breakpoint or position of failure point.
17. systems as claimed in claim 16, is characterized in that,
The light signal of the first wave length that described optical path component is exported by optical fiber by uplink optical fibers interface OLT, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU, is transmitted through optical fiber by uplink optical fibers interface and transfers to described OLT;
By the light signal of the three-wavelength of Laser emission interface laser transmitter projects, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports laser pick-off interface to, and exports laser detector to by laser pick-off interface.
18. systems as described in any one of claim 16 to 17, it is characterized in that, described optical path component comprises: wavelength division multiplexer and circulator, wherein,
WDM, the light signal of the first wave length exported by optical fiber by built-in uplink optical fibers interface OLT, is transmitted through optical fiber by downlink optical fiber interface and transfers to optical splitter; The light signal of the second wave length exported by optical fiber by downlink optical fiber interface ONU, is transmitted through optical fiber by uplink optical fibers interface and transfers to OLT;
Received the light signal of the three-wavelength that circulator exports by built-in reflective interface, export downlink optical fiber interface to, and exported by downlink optical fiber interface; The light signal of the three-wavelength reflected by downlink optical fiber interface, exports reflective interface to, and exports circulator to by reflective interface;
Circulator, for being received the light signal of the three-wavelength of laser transmitter projects by built-in first interface, exports the reflective interface of WDM to by the second built-in interface; The light signal of the three-wavelength of the reflection exported by the reflective interface of the second interface WDM, and export laser detector to by built-in laser pick-off interface.
19. systems as claimed in claim 18, it is characterized in that, described optical path component comprises the filter be arranged between the laser pick-off interface of circulator and laser detector further, and described filter is used for the light signal of the three-wavelength that the anti-reflection laser pick-off interface from circulator exports.
20. systems as claimed in claim 19, it is characterized in that, described generating laser comprises: laser emission element and drive circuit unit, wherein,
Drive circuit unit, for when breaking point detection is carried out in startup, driving laser transmitter unit launches the laser of three-wavelength, exports the first interface of circulator to.
21. systems as claimed in claim 20, it is characterized in that, described generating laser comprises further:
Control unit, for after the breaking point detection instruction receiving external equipment, generate the breaking point detection signal of telecommunication, and export drive circuit unit to, to make drive circuit unit according to the breaking point detection signal of telecommunication received, driving laser transmitter unit launches the laser of three-wavelength.
22. systems as claimed in claim 21, it is characterized in that, described laser detector comprises: photodiode and trans-impedance amplifier TIA, wherein,
Photodiode, for receiving after the light signal of laser pick-off interface output, exports corresponding response current to TIA;
TIA, for receiving response current, the response current according to receiving exports corresponding differential electric signal to signal of telecommunication sample circuit.
23. the system as claimed in claim 22, is characterized in that, described signal of telecommunication sample circuit comprises:
Analog-digital Converter adc circuit, samples for the signal of telecommunication exported laser detector, and sends to breaking point detection module to store the digital signal obtained of sampling;
Amplifying circuit, amplifying circuit is placed between laser detector and adc circuit, amplifies the signal of telecommunication that laser detector exports.
24. systems as claimed in claim 23, it is characterized in that, described breaking point detection module comprises: detection signal memory cell, comparing unit, normal operation signal memory cell and breakpoint location determining unit, wherein,
Detection signal memory cell, for storing the digital signal that adc circuit exports when detected state;
Normal operation signal memory cell, for storing the digital signal that gigabit passive optical network breakpoint detection system obtains when normal operating condition;
Comparing unit, for the digital signal of the digital signal and normal operation signal cell stores that compare detection signal cell stores, exports comparative result;
Breakpoint location determining unit, analyzes for the comparative result exported comparing unit, obtains the position of breakpoint or fault point.
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