CN102761366B - Be applied to the optical line terminal optical module in ten gigabit passive optical networks - Google Patents

Be applied to the optical line terminal optical module in ten gigabit passive optical networks Download PDF

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CN102761366B
CN102761366B CN201210237883.9A CN201210237883A CN102761366B CN 102761366 B CN102761366 B CN 102761366B CN 201210237883 A CN201210237883 A CN 201210237883A CN 102761366 B CN102761366 B CN 102761366B
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optical
signal
telecommunication
light
filter
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CN102761366A (en
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张强
赵其圣
李大伟
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 optical line terminal optical module be applied in ten gigabit passive optical networks, described optical module comprises: the first generating laser, and the signal of telecommunication inputted for receiving equipment also exports after being converted into the light signal of first wave length; First laser detector, for receiving the light signal of second wave length, outputs to described equipment after being converted into the signal of telecommunication; Second generating laser, for launching the light signal of three-wavelength; Second laser detector, for receiving the light signal of the three-wavelength of reflection, and exports after the light signal of reception is converted to the signal of telecommunication; Breaking point detection module, samples for the signal of telecommunication exported the second laser detector, analyzes, determine breakpoints of optical fiber position.Because the first generating laser and the first laser detector are when carrying out optical signal communications, second generating laser and the second laser detector also can carry out breaking point detection work, thus need not optical fiber network system be disconnected, and, other normal transmission not having the signal of the network at breakpoint place can be ensured.

Description

Be applied to the optical line terminal optical module in ten gigabit passive optical networks
Technical field
The present invention relates to Fibre Optical Communication Technology, particularly relate to a kind of optical line terminal optical module be applied in ten gigabit passive optical networks.
Background technology
In fiber optic communication systems, the transmission medium of light, as optical fiber/optical cable, often be laid on countryside or seabed, there is the problem such as link failure or transmission equipment fault unavoidably, break down or the position of breakpoint to can accurately locate, usually adopt optical time domain reflectometer (OTDR) to carry out breaking point detection.
In ten gigabit passive optical networks as shown in Figure 1, OLT(Optical Line Terminator, optical line terminal) be usually arranged on the central office of the access net system of optical fiber telecommunications system, OLT is responsible for that the electrical signal data in switch is converted into optical signal data and sends, and receive the outside light signal sent, be translated into the signal of telecommunication and flow to switch.OLT is by ODN(light feeder network) and ONU(optical net unit, optical network unit) be connected, ONU is arranged on local side usually, i.e. user side or building; Splitter generally has 2N to divide equally port for " optical splitter ", if the light intensity of input port is 1, then the light intensity of each output port is 1/N.For a multi-plexing light accessing system, be generally that 1 OLT is placed on telecommunication center office, then by optical splitter, be at least generally 1 point 32, or 1 point 64 even 1 point 128, namely 1 OLT is with 32 or 64 or 128 ONU.
Wherein, between OLT to spliter, 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, the schematic diagram of the breaking point detection method of prior art is as shown in Figure 2: disconnect the connection between OLT and optical fiber, by OTDR(Optical Time Domain Reflectometer, optical time domain reflectometer) be linked in optical fiber telecommunications system.OTDR is by utilizing emitted light pulse in optical fiber, and the information then returned at OTDR port accepts is analyzed.When light pulse is transmitted in optical fiber, can due to the character of optical fiber itself, connector, junction point, bend or other similar event and produce scattering, reflection, wherein the scattering of a part will turn back in OTDR with reflection, the useful information returned is measured by the detector of OTDR, and they are just as the time on diverse location in optical fiber or curve segment.OTDR uses Rayleigh scattering and Fresnel reflection to characterize the characteristic of optical fiber.Rayleigh scattering is formed because light signal produces irregular scattering along optical fiber.OTDR just measures a part of scattered light getting back to OTDR port.These backscatter signals just indicate decay (loss/distance) degree caused by optical fiber.Fresnel reflection is discrete reflection, and it is caused by the indivedual points in whole piece optical fiber, and these points are made up of the factor causing reverse parameter to change.On these aspects, have very strong back-scattering light and be reflected back.Therefore, OTDR utilizes the information of Fresnel reflection to be located by connecting a little, fibre-optic terminus or breakpoint.
The breakpoints of optical fiber detection method of prior art, first parting system network of having in the process of carrying out breaking point detection, then connects OTDR and detects, and testing process is complicated, makes testing staff's testing loaded down with trivial details.
And, also can have influence on the normal transmission that other does not have the signal of the network at breakpoint place between detection period.Such as, in above-mentioned example, be only that the optical fiber between spilter to ONU3 there occurs fibercuts, but due to OLT is opened from network interruption between detection period, thus also result in the signal interruption of ONU1, ONU2.
Therefore, in sum, the method for carrying out breakpoints of optical fiber detection in ten gigabit passive optical networks of prior art, is carrying out having influence on the normal transmission that other does not have the signal of the network at breakpoint place in breaking point detection process; And testing process is complicated, makes testing staff's testing loaded down with trivial details.
Summary of the invention
The embodiment provides and be a kind ofly applied to optical line terminal optical module in ten gigabit passive optical networks and breakpoints of optical fiber detection method thereof, in order to make breakpoints of optical fiber in ten gigabit passive optical networks detect more convenient, do not have influence on the normal transmission that other does not have the signal of the fiber optic network at breakpoint place.
According to an aspect of the present invention, provide a kind of optical line terminal optical module be applied in ten gigabit passive optical networks, comprising:
Optical path component, it is connected with optical fiber;
Ce circuit, for the signal of telecommunication of desampler input, carries out clock regeneration and data shaping to the signal of telecommunication received, is exported by the signal of telecommunication after shaping;
First generating laser, communicates with described optical path component light path, for receiving the signal of telecommunication of described ce circuit output and exporting after being converted into the light signal of first wave length, after described optical path component coupling, enters described optical fiber;
First laser detector, communicates with described optical path component light path, for receiving the light signal of second wave length, outputs to described switch after being converted into the signal of telecommunication; Wherein, the light signal of second wave length is transferred to the first laser detector from described optical fiber through described optical path component;
Second generating laser, communicates with described optical path component light path, for launching the light signal of three-wavelength; The light signal of three-wavelength enters described optical fiber after described optical path component coupling;
Second laser detector, communicates with described optical path component light path, for receiving the light signal of the three-wavelength of reflection, and exports after the light signal of reception is converted to the signal of telecommunication; The light signal of the three-wavelength of described reflection is transferred to the second laser detector from described optical fiber through described optical path component;
Breaking point detection module, samples for the signal of telecommunication exported the second laser detector, analyzes, determine breakpoints of optical fiber position.
Second generating laser specifically for receive that described switch sends for carry out breaking point detection the signal of telecommunication after, the light signal that the signal of telecommunication of reception is converted to three-wavelength is launched.
Breaking point detection module obtains digital signal after sampling specifically for the signal of telecommunication exported the second laser detector, and the digital signal obtained and the signal under normal circumstances preserved in advance is compared, and determines breakpoint location.
First Laser emission implement body comprises: the EML transmitting illuminant of the 9.95328Gbps of 1577nm and drive circuit thereof; And first wave length is specially 1577nm; The drive circuit of the EML transmitting illuminant of the 9.95328Gbps of described 1577nm receives the signal of telecommunication of described ce circuit output; And,
First laser acquisition implement body comprises: the APD pick-up probe of the 2.488Gbps of 1270nm and amplitude limiting amplifier circuit; And second wave length is specially 1270nm.
Second Laser emission implement body comprises: the OTDR DFB burst transmissions light source of 1625nm and drive circuit thereof; And three-wavelength is specially 1625nm;
Second laser acquisition implement body comprises: the OTDR APD detector of 1625nm.
Described breaking point detection module specifically comprises: gain circuitry, adc circuit, logic array circuit and MCU control circuit;
Described gain circuitry is input to described adc circuit after amplifying for the signal of telecommunication exported the second laser detector;
Described adc circuit is used for sampling to the signal of telecommunication of input, and the digital signal of sampling is stored into described logic array circuit;
Described logic array circuit be used for by described adc circuit stored in digital signal compare with the signal under normal circumstances that prestores, determine breakpoints of optical fiber position; And output optical fibre breakpoint location is preserved in described MCU control circuit.
Described optical path component specifically comprises:
Coaxial type laser diode module TO-CAN1, filter F1, F2 and F3, wherein, the Laser emission chip of the EML transmitting illuminant of the 9.95328Gbps of the first optical lens and described 1577nm is encapsulated in TO-CAN1, the light signal of the light source transmitting chip output of the EML transmitting illuminant of the 9.95328Gbps of described 1577nm is after the first optical lens injection, through the transmission of described filter F1, F2 and F3, coupled into optical fibres;
Coaxial type laser diode module TO-CAN2 and filter F5, wherein, encapsulates the optical signal detection chip of the APD pick-up probe of the 2.488Gbps of the second optical lens and described 1270nm in TO-CAN2; The light signal of the 1270nm inputted from described optical fiber, after the reflection of described filter F3 and the transmission of filter F5 input the second optical lens, enters into the optical signal detection chip of the APD pick-up probe of the 2.488Gbps of described 1270nm through the second optical lens;
Coaxial type laser diode module TO-CAN3, wherein encapsulate the Laser emission chip of the OTDR DFB burst transmissions light source of the 3rd optical lens and described 1625nm, the light signal that the Laser emission chip of the OTDRDFB burst transmissions light source of described 1625nm sends is after the 3rd optical lens injection, through the reflection of described filter F2 and the transmission of filter F3, be coupled into described optical fiber;
Coaxial type laser diode module TO-CAN4 and filter F4, wherein, the optical signal detection chip of the OTDR APD detector of the 4th optical lens and described 1625nm is encapsulated in TO-CAN4, from the light signal of the 1625nm that described optical fiber inputs, through the transmission of described filter F3, F2, with the reflection of described filter F1, after the transmission of described filter F4, enter into the optical signal detection chip of the OTDR APD detector of described 1625nm through the 4th optical lens.
Wherein, described filter F1 plates the anti-reflection film of 1577nm and the anti-film of increasing of 1625nm, and it is arranged between TO-CAN1 and optical fiber interface, and center and first intersection point of F1 coincide, and the optical lens of F1 and TO-CAN1 angle at 45 °, angle at 45 ° with the optical lens of TO-CAN4; First intersection point refers to the intersection point of the extended line of TO-CAN4 and the line of TO-CAN1 and optical fiber interface;
Described filter F2 plates the anti-reflection film of 1577nm, the transmission of 1625nm90% and the reflectance coating of 10%, and it is arranged between TO-CAN1 and optical fiber interface, and center and second intersection point of F2 coincide, and the optical lens of F2 and TO-CAN3 angle at 45 °; Second intersection point refers to the intersection point of the extended line of TO-CAN3 and the line of TO-CAN1 and optical fiber interface;
Described filter F3 plates the anti-reflection film of 1577nm, the anti-film of increasing of 1270nm and the anti-reflection film of 1625nm, and it is arranged between filter F2 and optical fiber interface, and center and the 3rd intersection point of F3 coincide, and the optical lens of F3 and TO-CAN2 angle at 45 °; Second intersection point refers to the intersection point of the extended line of TO-CAN2 and the line of TO-CAN1 and optical fiber interface;
Described filter F4 plates the anti-reflection film of 1625nm, and it is arranged between filter F1 and TO-CAN4, and F4 is centrally located on the extended line of TO-CAN4, and the optical lens of F4 and TO-CAN4 parallels;
Described filter F5 plates the anti-reflection film of 1270nm, and it is arranged between filter F3 and TO-CAN2, and F5 is centrally located on the extended line of TO-CAN2, and the optical lens of F5 and TO-CAN2 parallels.
Described optical module, its output pin is 30; Comprising:
Pin Tx_Dis_OTDR, in order to the enable signal of desampler control OTDR;
Pin Data_OTDR, the signal of telecommunication for carrying out breaking point detection sent in order to desampler;
Pin TD-and TD+, in order to receive the communication signal of telecommunication of described switch input;
Pin RD-and RD+, in order to the described switch output communication signal of telecommunication.
The embodiment of the present invention is owing to being applied in the optical line terminal optical module in ten gigabit passive optical networks the first generating laser and the first laser detector that are not only provided with for carrying out optical signal communications, and, also be provided with the second generating laser and the second laser detector that can be used for breaking point detection simultaneously, and the transmitting-receiving of 4 road light signals can be realized by optical path component, therefore, first generating laser and the first laser detector are when carrying out optical signal communications, and the second generating laser and the second laser detector also can carry out breaking point detection work.So, use the optical line terminal optical module of the embodiment of the present invention need not disconnect optical fiber network system when carrying out breakpoints of optical fiber detection, and, when carrying out breaking point detection, first generating laser and the first laser detector still can work, thus can ensure other normal transmission not having the signal of the network at breakpoint place.
Accompanying drawing explanation
Fig. 1 is the optical fiber telecommunications system schematic diagram of prior art;
Fig. 2 is that the breakpoints of optical fiber of prior art detects schematic diagram;
Fig. 3 is the optical line terminal optical module internal structure circuit block diagram be applied in ten gigabit passive optical networks of the embodiment of the present invention;
Fig. 4 is the ce circuit of the embodiment of the present invention, the EML transmitting illuminant of the 9.95328Gbps of 1577nm and the circuit diagram of drive circuit thereof;
Fig. 5 is the APD pick-up probe of the 2.488Gbps of embodiment of the present invention 1270nm and the circuit diagram of amplitude limiting amplifier circuit;
Fig. 6 is the OTDR DFB burst transmissions light source of the 1625nm of the embodiment of the present invention and the circuit diagram of drive circuit thereof;
Fig. 7 is the OTDR APD detector of the 1625nm of the embodiment of the present invention and the circuit diagram of breaking point detection module;
Fig. 8 is the integrated circuit schematic diagram being applied to the optical line terminal optical module in ten gigabit passive optical networks of the embodiment of the present invention;
Fig. 9 is fibercuts schematic diagram in ten gigabit passive optical networks of the embodiment of the present invention;
Figure 10,11 is the schematic diagram of the signal that the OTDR APD detector of the embodiment of the present invention receives;
Figure 12 is the optical path component internal structure schematic diagram of the embodiment of the present invention.
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.
In the technical scheme of the embodiment of the present invention, by OTDR function i ntegration in the optical module of OLT, and by a kind of optical path component of receiving and dispatching 4 road light signals, the light signal realizing communication transmits with the light signal detecting breakpoint simultaneously in a fiber; Thus when carrying out breaking point detection, OLT need not be disconnected again, make breaking point detection more convenient, do not have influence on the normal transmission that other does not have the signal of the network at breakpoint place.
The technical scheme of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.The optical line terminal optical module internal structure circuit block diagram be applied in ten gigabit passive optical networks of the embodiment of the present invention, as shown in Figure 3, comprising: the first generating laser 301, first laser detector 302, second generating laser 303, second laser detector 304, breaking point detection module 305, optical path component 306, ce circuit 307.
Optical path component 306 is connected with optical fiber; Optical path component 306 communicates with the first generating laser 301 light path, communicate with the first laser detector 302 light path, communicate with the second generating laser 303 light path, communicate with the second laser detector 304 light path.
The signal of telecommunication that the switch being arranged on the central office of the access net system of optical fiber telecommunications system transmits, first after ce circuit 307, is input to the first generating laser 301.The electrical signal rate transmitted due to switch reaches 10Gbps, and signal distortion is serious, so need CDR(Clock Data Recovery, clock and data recovery) circuit carries out shaping to signal.SerDes(serializer/deserializer in ce circuit 307 desampler, or claim switch) after the signal of telecommunication that sends, clock regeneration and data shaping are carried out to the signal of telecommunication received, the signal of telecommunication after shaping is outputted to the first generating laser 301.
The signal of telecommunication of the first generating laser 301 in order to receiving, after electro-optic conversion, the light signal being converted to first wave length is launched.The light signal that first generating laser 301 is launched enters into optical fiber and propagates after optical path component 306 is coupled.
The second wave length light signal of coming from Optical Fiber Transmission is after point light action of optical path component 306, and the light signal of second wave length is sent to the first laser detector 302.First laser detector 302, by the light signal of the second wave length of reception, after opto-electronic conversion, is converted to the signal of telecommunication and sends to switch, the SerDes(switch of switch) carry out data analysis.
Switch achieves signal by the first generating laser 301 and the first laser detector 302 and sends and the communication function received.That is, the signal of telecommunication for communicating that the first generating laser 301 desampler sends, is converted into the light signal for communicating; First laser detector 302 receives the light signal for communicating, and the signal of telecommunication be converted into for communicating sends to switch.
Second generating laser 303 is for launching the light signal of three-wavelength, and the light signal of this three-wavelength is the light signal for detecting breakpoint.The light signal of the three-wavelength that the second laser detector 304 is launched enters into optical fiber and propagates after optical path component 306 is coupled.The light signal of three-wavelength transmits in a fiber, reflected at the breakaway poing of optical fiber or the fault place of equipment or other place, transmitted in a fiber by the light signal of the three-wavelength reflected, after turning back to optical path component 306, through point light action of optical path component 306, the light signal of the three-wavelength be reflected back toward is sent to the second laser detector 304.Particularly, the signal of telecommunication for carrying out breaking point detection that second generating laser 303 desampler sends, and the signal of telecommunication of reception is converted to the light signal of three-wavelength: the MAC(Media Access Control in switch, medium access controller) when carrying out breaking point detection, send the signal of telecommunication for carrying out breaking point detection to the second generating laser 303, the light signal that the signal of telecommunication of reception is converted to three-wavelength is launched by the second generating laser 303.
After second laser detector 304 receives the light signal of the three-wavelength reflected, after opto-electronic conversion, export the signal of telecommunication.
Breaking point detection module 305 is sampled to the signal of telecommunication that the second laser detector 304 exports, is analyzed: the signal of telecommunication of sampling and the signal of telecommunication under normal circumstances preserved in advance are compared, thus determine the position of breakpoint or fault point.
First generating laser 301 of the above-mentioned optical line terminal optical module be applied in ten gigabit passive optical networks specifically comprises: the EML(Electro-absorptionModulated Laser of the 9.95328Gbps of 1577nm, Electroabsorption Modulated Laser) transmitting illuminant and drive circuit thereof.The EML transmitting illuminant of the 9.95328Gbps of 1577nm is specially the descending sequential filming light source of EML of the 9.95328Gbps of 1577nm.The drive circuit of the EML transmitting illuminant of the 9.95328Gbps of this 1577nm receives the signal of telecommunication of ce circuit 307 output, and driving this EML transmitting illuminant to launch first wave length according to the signal of telecommunication received is the light signal of 1577nm.The light signal of the light signal launched of this EML transmitting illuminant to be bit rate the be descending sequential filming of 9.95328Gbps, and data frame structure meets the protocol requirement of G.987.2 agreement.The EML transmitting illuminant of the 9.95328Gbps of ce circuit, 1577nm and the circuit diagram of drive circuit thereof are as shown in Figure 4.Because the downlink data being applied to the optical line terminal optical module in ten gigabit passive optical networks reaches 10G, and wavelength is 1577nm, in order to ensure transmission performance, needing to use externally modulated laser EML and driver, and needing in circuit to add ce circuit.The circuit that the EML transmitting illuminant circuit of the 9.95328Gbps of this light source driving circuit and 1577nm is well known to those skilled in the art, introduces herein no longer in detail.
First laser detector 302 of the above-mentioned optical line terminal optical module be applied in ten gigabit passive optical networks specifically comprises: the APD(Avalanche Photo Diode of the 2.488Gbps of 1270nm, avalanche photodide) pick-up probe and amplitude limiting amplifier circuit.The APD pick-up probe of the 2.488Gbps of 1270nm is specially the APD uplink burst pick-up probe of the 2.488Gbps of 1270nm.The second wave length of reception is that the light signal of 1270nm is converted to the signal of telecommunication by the APD pick-up probe of the 2.488Gbps of 1270nm, by amplitude limiting amplifier circuit, the signal of telecommunication that APD pick-up probe is changed is amplified laggard line output.The bit rate of what the APD pick-up probe of the 2.488Gbps of this 1270nm received is upper behavior 1270nm is the signal of 2.488Gbps, and signal data frame structure meets the protocol requirement of G.987.2 agreement.The APD pick-up probe of the 2.488Gbps of 1270nm and the circuit diagram of amplitude limiting amplifier circuit are as shown in Figure 5.Due to the circuit that APD pick-up probe and the amplitude limiting amplifier circuit of the 2.488Gbps of this 1270nm are well known to those skilled in the art, introduce no longer in detail herein.
The second generating laser 303 being applied to the optical line terminal optical module in ten gigabit passive optical networks specifically can comprise: the OTDR DFB burst transmissions light source of 1625nm and drive circuit thereof; The drive circuit of the OTDR DFB burst transmissions light source of 1625nm, drives this OTDR DFB burst transmissions light source to launch the light signal that three-wavelength is 1625nm.Particularly, the signal of telecommunication for carrying out breaking point detection of the MAC transmission of the drive circuit desampler of the OTDR DFB burst transmissions light source of 1625nm, the signal of telecommunication according to receiving drives this OTDR DFB burst transmissions light source to launch the light signal that three-wavelength is 1625nm.When carrying out breaking point detection, MAC is enable by the drive circuit of the OTDR DFB burst transmissions light source of TX_Dis_OTDR holding wire (or citing approvingly pin) control 1625nm, and by Data_OTDR holding wire to the signal of telecommunication of this drive circuit transmission for carrying out breaking point detection; This drive circuit drives OTDR DFB burst transmissions light source to launch the light signal that three-wavelength is 1625nm according to the signal of telecommunication received.
As shown in Figure 6, the circuit that OTDR DFB burst transmissions light source and drive circuit thereof due to 1625nm are well known to those skilled in the art, introduces herein no longer in detail for the OTDR DFB burst transmissions light source of 1625nm and the circuit diagram of drive circuit thereof.
The second laser detector 304 being applied to the optical line terminal optical module in ten gigabit passive optical networks is specially the OTDRAPD detector of 1625nm.It is after the light signal of 1625nm that the OTDR APD detector of 1625nm receives the three-wavelength reflected, after opto-electronic conversion, export the signal of telecommunication.
The breaking point detection module 305 being applied to the optical line terminal optical module in ten gigabit passive optical networks specifically can comprise: gain circuitry and ADC(analog-to-digital conversion) circuit, and logic array circuit and MCU control circuit.As shown in Figure 7, the circuit that the OTDR APD detector circuit due to 1625nm is well known to those skilled in the art, introduces herein no longer in detail for the OTDRAPD detector of 1625nm and the circuit diagram of breaking point detection module 305.
Obviously, except 1625nm wavelength, second generating laser 303 of optical line terminal optical module also can adopt the OTDR DFB burst transmissions light source of other wavelength, and the second laser detector 304 of optical line terminal optical module also can adopt the OTDR APD detector of other wavelength.For the OTDR DFB burst transmissions light source adopting other wavelength in optical line terminal optical module, or the OTDRAPD detector of other wavelength also should be considered as protection scope of the present invention.
The signal of telecommunication that the OTDR APD detector of 1625nm exports amplifies by the gain circuitry of breaking point detection module 305, be input in adc circuit, adc circuit is sampled to the signal of telecommunication, obtains digital signal, and the digital signal of sampling is stored in logic array circuit.Logic array circuit by adc circuit stored in digital signal be stored in advance in storage medium as FLASH(flash memory) in signal under normal circumstances compare, pass through logical operation, determine the position of breakpoints of optical fiber or fault point, and send to MCU control circuit to preserve the position of breakpoint or fault point by the interface between MCU control circuit.The MAC of switch can obtain the position of breakpoints of optical fiber or fault point by access MCU control circuit.Logic array circuit can be specifically FPGA(Field Programmable Gata Array, field programmable gate array), PAL(programmable logic array) etc. circuit.Obviously, those skilled in the art also can adopt other device, compare, determine the function of breakpoint or position of failure point as the computing chips such as single-chip microcomputer, processor, micro controller realize signal.
The position that MCU control circuit obtains breakpoint or fault point from logic array circuit stores.MCU control circuit can be specifically the single-chip microcomputer, controller, processor etc. of various model.
In addition, MCU control circuit can also communicate with the MAC of switch, and the status signal of optical line terminal optical module is reported MAC, receives the instruction that MAC sends simultaneously, the work of the first generating laser 301 is controlled according to instruction, or the work of the second generating laser 303.
Be applied to the integrated circuit schematic diagram of the optical line terminal optical module in ten gigabit passive optical networks, as shown in Figure 8, comprise above-mentioned ce circuit, the EML transmitting illuminant of 9.95328Gbps of 1577nm and drive circuit thereof, and APD pick-up probe, the amplitude limiting amplifier circuit of the 2.488Gbps of 1270nm, and the OTDR DFB burst transmissions light source of 1625nm and drive circuit thereof, and the OTDR APD detector of 1625nm and gain circuitry, adc circuit, logic array circuit and MCU control circuit.MCU control circuit wherein also can be used for mode of operation or the operating state of the drive circuit of the EML transmitting illuminant of the 9.953Gbps of control 1577nm.
The operation principle being applied to the optical line terminal optical module in ten gigabit passive optical networks is as follows:
The optical line terminal optical module be applied in ten gigabit passive optical networks can be carried out communication work and breaking point detection work simultaneously, or only be carried out communication work.
The communication work principle being applied to the optical line terminal optical module in ten gigabit passive optical networks is:
The signal of telecommunication that ce circuit desampler transmits, carries out clock regeneration and data shaping to the signal of telecommunication received, the signal of telecommunication after shaping is input to the drive circuit of the EML transmitting illuminant of the 9.95328Gbps of 1577nm again.The signal of telecommunication that the drive circuit of the EML transmitting illuminant of the 9.95328Gbps of 1577nm exports according to ce circuit, driving this EML transmitting illuminant to launch first wave length is the light signal of 1577nm.The EML laser of 1577nm uses as the light source of down link, sends the light signal of continuous print 9.95328Gbps, realizes the transmission of communication data.
The APD pick-up probe of the 2.488Gbps of 1270nm receives and sends uplink burst light bag by ONU, light signal is converted to the signal of telecommunication, the signal of telecommunication changed by APD pick-up probe by amplitude limiting amplifier circuit outputs to switch after amplifying, and realizes the reception of communication data.
Be applied to the breaking point detection operation principle of the optical line terminal optical module in ten gigabit passive optical networks:
When optical fiber link generation breakpoint, the OTDR DFB burst transmissions light source of 1625nm sends a series of burst laser under the effect of its drive circuit; The breakpoint of laser in optical fiber link, due to Rayleigh scattering and Fresnel reflection, understands some return loss light and is reflected back optical fiber, the laser of reflection and then turn back to the OTDR APD detector of 1625nm.The OTDR APD detector of 1625nm receives the light reflected, and through photoelectric conversion, forms the signal of telecommunication, then amplifies and the sampling of adc circuit through gain circuitry, obtain digital signal transfers to logic array circuit FPGA.The signal under normal circumstances deposited in the signal received and Flash compares by FPGA, and find the position that breakpoint occurs, breakpoint location is passed to MCU control circuit by SPI interface by FPGA.The MAC of switch, by access MCU control circuit, learns the position that breakpoint occurs.
Fig. 9 illustrates fibercuts situation in ten gigabit passive optical networks: be applied between optical line terminal optical module in ten gigabit passive optical networks to spliter, there is the optical fiber that one section of 10km is long, distance between spliter to ONU1 is 1km, distance between spliter to ONU2 is 2km, distance between spilter to ONU3 is 10km, but there occurs fibercuts at 7km place.When we use the OTDR function of this optical module, the Distributed Feedback Laser Emission Lasers signal of 1625nm, OTDR APD detector receives signal as shown in Figure 10.As can be seen from the signal shown in Figure 10, at optical line terminal optical module distance 10km place, due to the reflection of spliter, detect a Fei Nier reflection peak, at 11km place, detect the reflection peak of ONU1, at 12km place, detect the reflection peak of ONU2, at 17km place, detect the reflection peak that fibercuts causes.
Comparison system layout, the signal of normal condition should be: at optical line terminal optical module distance 10km place, due to the reflection of spliter, detect a reflection peak, at 11km place, we detect the reflection peak of ONU1, at 12km place, we detect the reflection peak of ONU2, at 20km place, detect the reflection peak of ONU3.
Thus, can judge that breakpoint has appearred in the circuit between spliter to ONU3, this breakpoint distance light road terminal optical module 17km.
Suppose after OTDR luminescence, receive the reflection peak (as shown in figure 11) of breakpoint at T2 time point, so the distance of distance light road, breakpoint place terminal optical module calculates according to following formula 1:
d = c × T 2 2 × n (formula 1)
In formula 1, c=3 × 10 8m/s is the light velocity, and n is the refractive index of fiber core, and the numerical value that d calculates is exactly the distance of breakpoint distance light road terminal optical module.
After the optical line terminal optical module be applied in ten gigabit passive optical networks encapsulates, itself and external equipment, MAC or SerDes of such as switch, the pin be connected (pin) is defined as follows shown in table 1:
Table 1
As can be seen from Table 1, the output pin after optical line terminal optical module encapsulation is 30.Wherein, relevant to the OTDR function of optical line terminal optical module pin comprises:
Pin two 5, Tx_Dis_OTDR: in order to the enable signal of desampler control OTDR, namely switch passes through the enable of the drive circuit of the OTDR DFB burst transmissions light source of this pin control 1625nm;
Pin two 6, Data_OTDR: in order to receive the signal of telecommunication for carrying out breaking point detection, namely switch is by the drive circuit transmission signal of telecommunication for carry out breaking point detection of this pin to the OTDR DFB burst transmissions light source of 1625nm.
The pin relevant to the communication function of optical line terminal optical module comprises:
Pin two 8 and 29, i.e. TD-with TD+ pin: in order to the signal of telecommunication that communicates of desampler input, namely switch sends the signal of telecommunication by pin two 8 and 29 to ce circuit;
Pin one 7 and 18, i.e. RD-and RD+ pin: the signal of telecommunication that switch receives the APD pick-up probe of the 2.488Gbps of 1270nm amplitude limiting amplifier circuit by pin one 7 and 18 exports.
The relevant pins controlling optical line terminal optical module comprises:
Pin one 1 and pin one 0, i.e. SDA with SCL pin: switch is realized and the communicating of MCU control circuit by pin one 1 and pin one 0.Particularly, switch sends instruction by pin one 1 and pin one 0 to MCU control circuit, and receives by pin one 1 and pin one 0 data that MCU control circuit returns, the breakpoint location that such as MCU control circuit returns.
The internal structure of optical path component 306, as shown in figure 12, comprising 4 TO-CAN(TransistorOutline CAN, coaxial type laser diode module) and 5 filters.4 TO-CAN are respectively: TO-CAN1, TO-CAN2, TO-CAN3, TO-CAN4.5 filters are respectively: F1, F2, F3, F4, F5.
Wherein, the EML transmitting illuminant light path of the 9.95328Gbps of coaxial type laser diode module TO-CAN1 and 1577nm communicates, and is positioned at the high order end of optical path component, relative with the optical fiber interface of optical path component 306.Particularly, the light source transmitting chip of the EML transmitting illuminant of the 9.95328Gbps of 1577nm and the first optical lens are packaged in TO-CAN1.The light signal that the EML transmitting illuminant of the 9.95328Gbps of 1577nm sends penetrates after first optical lens of TO-CAN1, the transmission of mating plate F1, F2 and F3 after filtration, and coupled into optical fibres, carries out the transmission of signal.
The APD pick-up probe light path of the 2.488Gbps of coaxial type laser diode module TO-CAN2 and 1270nm communicates, and is positioned at the right-hand member above optical path component, perpendicular with the line of TO-CAN1 and optical fiber interface.Particularly, the optical signal detection chip of the APD pick-up probe of the 2.488Gbps of 1270nm and the second optical lens are packaged in TO-CAN2.The light signal being input to the 1270nm of optical path component 306 from optical fiber, after the reflection of F3 and the transmission of F5 input the second optical lens, enters into the optical signal detection chip of the APD pick-up probe of the 2.488Gbps of 1270nm through the second optical lens.
The OTDR DFB burst transmissions light source optical path of coaxial type laser diode module TO-CAN3 and 1625nm communicates, and is positioned at the below of optical path component, perpendicular with the line of TO-CAN1 and optical fiber interface.Particularly, the light source transmitting chip of the OTDR DFB burst transmissions light source of 1625nm and the 3rd optical lens are packaged in TO-CAN3.The light signal that the light source transmitting chip of the OTDR DFB burst transmissions light source of 1625nm sends after the 3rd optical lens injection, through the reflection of F2 and the transmission of F3, coupled into optical fibres.
The OTDR APD detector light path of coaxial type laser diode module TO-CAN4 and 1625nm communicates, and is positioned at the left side above optical path component, perpendicular with the line of TO-CAN1 and optical fiber interface.Particularly, the optical signal detection chip of the OTDR APD detector of 1625nm and the 4th optical lens are packaged in TO-CAN4.The light signal of the 1625nm of optical path component 306 is input to from optical fiber, through the transmission of F3, F2, and the reflection of F1, after the 4th optical lens, enter into the optical signal detection chip of the OTDRAPD detector of described 1625nm after the transmission of F4.
Filter F1 plates the anti-reflection film of 1577nm and the anti-film of increasing of 1625nm, and it is arranged between TO-CAN1 and optical fiber interface, and center and first intersection point of F1 coincide, and the optical lens of F1 and TO-CAN1 angle at 45 °, angle at 45 ° with the optical lens of TO-CAN4; First intersection point refers to the intersection point of the extended line of TO-CAN4 and the line of TO-CAN1 and optical fiber interface.On F1, how to plate the anti-reflection film of 1577nm and the anti-film of increasing of 1625nm, to make F1 can through the light of 1577nm wavelength, and the technology that the light reflecting 1625nm wavelength is well known to those skilled in the art, repeat no more herein.
Filter F2 plates the anti-reflection film of 1577nm, the transmission of 1625nm90% and the reflectance coating of 10%, and it is arranged between TO-CAN1 and optical fiber interface, and center and second intersection point of F2 coincide, and the optical lens of F2 and TO-CAN3 angle at 45 °; Second intersection point refers to the intersection point of the extended line of TO-CAN3 and the line of TO-CAN1 and optical fiber interface.On F2, how to plate the anti-reflection film of 1577nm, the transmission of 1625nm90% and the reflectance coating of 10%, through the light of 1577nm wavelength, can project the light of the 1625nm wavelength of 90% to make F2, the technology that the light reflecting the 1625nm wavelength of 10% is well known to those skilled in the art, repeats no more herein.
Filter F3 plates the anti-reflection film of 1577nm, the anti-film of increasing of 1270nm and the anti-reflection film of 1625nm, and it is arranged between filter F2 and optical fiber interface, and center and the 3rd intersection point of F3 coincide, and the optical lens of F3 and TO-CAN2 angle at 45 °; 3rd intersection point refers to the intersection point of the extended line of TO-CAN2 and the line of TO-CAN1 and optical fiber interface.On F3, how to plate the anti-reflection film of 1577nm, the anti-film of increasing of 1270nm and the anti-reflection film of 1625nm, to make F3 can through the light of 1577nm wavelength, the light of reflection 1270nm wavelength, the technology that the light through 1625nm wavelength is well known to those skilled in the art, repeats no more herein.
Filter F4 plates the anti-reflection film of 1625nm, and it is arranged between filter F1 and TO-CAN4, and F4 is centrally located on the extended line of TO-CAN4, and the optical lens of F4 and TO-CAN4 parallels.On F4, how to plate the anti-reflection film of 1625nm, with the technology making F4 can be well known to those skilled in the art through the light of 1625nm wavelength, repeat no more herein.
Filter F5 plates the anti-reflection film of 1270nm, and it is arranged between filter F3 and TO-CAN2, and F5 is centrally located on the extended line of TO-CAN2, and the optical lens of F5 and TO-CAN2 parallels.On F5, how to plate the anti-film of increasing of 1270nm, with the technology making F5 can be well known to those skilled in the art through the light of 1270nm wavelength, repeat no more herein.
The embodiment of the present invention is owing to being applied in the optical line terminal optical module in ten gigabit passive optical networks the first generating laser and the first laser detector that are not only provided with for carrying out optical signal communications, and, also be provided with the second generating laser and the second laser detector that can be used for breaking point detection simultaneously, and the transmitting-receiving of 4 road light signals can be realized by optical path component, therefore, first generating laser and the first laser detector are when carrying out optical signal communications, and the second generating laser and the second laser detector also can carry out breaking point detection work.So, use the optical line terminal optical module of the embodiment of the present invention need not disconnect optical fiber network system when carrying out breakpoints of optical fiber detection, and, when carrying out breaking point detection, first generating laser and the first laser detector still can work, thus can ensure other normal transmission not having the signal of the network at breakpoint place.
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 (6)

1. be applied to the optical line terminal optical module in ten gigabit passive optical networks, comprise:
Optical path component, it is connected with optical fiber;
Ce circuit, for the signal of telecommunication of desampler input, carries out clock regeneration and data shaping to the signal of telecommunication received, is exported by the signal of telecommunication after shaping;
First generating laser, communicates with described optical path component light path, for receiving the signal of telecommunication of described ce circuit output and exporting after being converted into the light signal of first wave length, after described optical path component coupling, enters described optical fiber; First Laser emission implement body comprises: the EML transmitting illuminant of the 9.95328Gbps of 1577nm and drive circuit thereof; First wave length is specially 1577nm; The drive circuit of the EML transmitting illuminant of the 9.95328Gbps of described 1577nm receives the signal of telecommunication of described ce circuit output;
First laser detector, communicates with described optical path component light path, for receiving the light signal of second wave length, outputs to described switch after being converted into the signal of telecommunication; Wherein, the light signal of second wave length is transferred to the first laser detector from described optical fiber through described optical path component; First laser acquisition implement body comprises: the APD pick-up probe of the 2.488Gbps of 1270nm and amplitude limiting amplifier circuit; Second wave length is specially 1270nm;
Second generating laser, communicates with described optical path component light path, for launching the light signal of three-wavelength; The light signal of three-wavelength enters described optical fiber after described optical path component coupling; Second Laser emission implement body comprises: the OTDR DFB burst transmissions light source of 1625nm and drive circuit thereof; Three-wavelength is specially 1625nm;
Second laser detector, communicates with described optical path component light path, for receiving the light signal of the three-wavelength of reflection, and exports after the light signal of reception is converted to the signal of telecommunication; The light signal of the three-wavelength of described reflection is transferred to the second laser detector from described optical fiber through described optical path component; Second laser acquisition implement body comprises: the OTDR APD detector of 1625nm;
Breaking point detection module, samples for the signal of telecommunication exported the second laser detector, analyzes, determine breakpoints of optical fiber position;
Described optical path component specifically comprises:
Coaxial type laser diode module TO-CAN1, filter F1, F2 and F3, wherein, the Laser emission chip of the EML transmitting illuminant of the 9.95328Gbps of the first optical lens and described 1577nm is encapsulated in TO-CAN1, the light signal of the light source transmitting chip output of the EML transmitting illuminant of the 9.95328Gbps of described 1577nm is after the first optical lens injection, through the transmission of described filter F1, F2 and F3, coupled into optical fibres;
Coaxial type laser diode module TO-CAN2 and filter F5, wherein, encapsulates the optical signal detection chip of the APD pick-up probe of the 2.488Gbps of the second optical lens and described 1270nm in TO-CAN2; The light signal of the 1270nm inputted from described optical fiber, after the reflection of described filter F3 and the transmission of filter F5 input the second optical lens, enters into the optical signal detection chip of the APD pick-up probe of the 2.488Gbps of described 1270nm through the second optical lens;
Coaxial type laser diode module TO-CAN3, wherein encapsulate the Laser emission chip of the OTDR DFB burst transmissions light source of the 3rd optical lens and described 1625nm, the light signal that the Laser emission chip of the OTDRDFB burst transmissions light source of described 1625nm sends is after the 3rd optical lens injection, through the reflection of described filter F2 and the transmission of filter F3, be coupled into described optical fiber;
Coaxial type laser diode module TO-CAN4 and filter F4, wherein, the optical signal detection chip of the OTDR APD detector of the 4th optical lens and described 1625nm is encapsulated in TO-CAN4, from the light signal of the 1625nm that described optical fiber inputs, through the transmission of described filter F3, F2, with the reflection of described filter F1, after the transmission of described filter F4, enter into the optical signal detection chip of the OTDR APD detector of described 1625nm through the 4th optical lens.
2. optical module as claimed in claim 1, is characterized in that,
Second generating laser specifically for receive that described switch sends for carry out breaking point detection the signal of telecommunication after, the light signal that the signal of telecommunication of reception is converted to three-wavelength is launched.
3. optical module as claimed in claim 2, is characterized in that,
Breaking point detection module obtains digital signal after sampling specifically for the signal of telecommunication exported the second laser detector, and the digital signal obtained and the signal under normal circumstances preserved in advance is compared, and determines breakpoint location.
4. the optical module as described in as arbitrary in claim 1-3, it is characterized in that, described breaking point detection module specifically comprises: gain circuitry, adc circuit, logic array circuit and MCU control circuit;
Described gain circuitry is input to described adc circuit after amplifying for the signal of telecommunication exported the second laser detector;
Described adc circuit is used for sampling to the signal of telecommunication of input, and the digital signal of sampling is stored into described logic array circuit;
Described logic array circuit be used for by described adc circuit stored in digital signal compare with the signal under normal circumstances that prestores, determine breakpoints of optical fiber position; And output optical fibre breakpoint location is preserved in described MCU control circuit.
5. optical module as claimed in claim 4, is characterized in that,
Described filter F1 plates the anti-reflection film of 1577nm and the anti-film of increasing of 1625nm, it is arranged between TO-CAN1 and optical fiber interface, center and first intersection point of F1 coincide, and the optical lens of F1 and TO-CAN1 angle at 45 °, angle at 45 ° with the optical lens of TO-CAN4; First intersection point refers to the intersection point of the extended line of TO-CAN4 and the line of TO-CAN1 and optical fiber interface;
Described filter F2 plates the anti-reflection film of 1577nm, the transmission of 1625nm 90% and the reflectance coating of 10%, and it is arranged between TO-CAN1 and optical fiber interface, and center and second intersection point of F2 coincide, and the optical lens of F2 and TO-CAN3 angle at 45 °; Second intersection point refers to the intersection point of the extended line of TO-CAN3 and the line of TO-CAN1 and optical fiber interface;
Described filter F3 plates the anti-reflection film of 1577nm, the anti-film of increasing of 1270nm and the anti-reflection film of 1625nm, and it is arranged between filter F2 and optical fiber interface, and center and the 3rd intersection point of F3 coincide, and the optical lens of F3 and TO-CAN2 angle at 45 °; Second intersection point refers to the intersection point of the extended line of TO-CAN2 and the line of TO-CAN1 and optical fiber interface;
Described filter F4 plates the anti-reflection film of 1625nm, and it is arranged between filter F1 and TO-CAN4, and F4 is centrally located on the extended line of TO-CAN4, and the optical lens of F4 and TO-CAN4 parallels;
Described filter F5 plates the anti-reflection film of 1270nm, and it is arranged between filter F3 and TO-CAN2, and F5 is centrally located on the extended line of TO-CAN2, and the optical lens of F5 and TO-CAN2 parallels.
6. optical module as claimed in claim 5, it is characterized in that, its output pin is 30; Comprising:
Pin Tx_Dis_OTDR, in order to the enable signal of desampler control OTDR;
Pin Data_OTDR, the signal of telecommunication for carrying out breaking point detection sent in order to desampler;
Pin TD-and TD+, in order to receive the communication signal of telecommunication of described switch input;
Pin RD-and RD+, in order to the described switch output communication signal of telecommunication.
CN201210237883.9A 2012-07-10 2012-07-10 Be applied to the optical line terminal optical module in ten gigabit passive optical networks Active CN102761366B (en)

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WO2014094255A1 (en) * 2012-12-19 2014-06-26 青岛海信宽带多媒体技术有限公司 Optical module of optical time domain reflectometer and breakpoint detection system of gigabit passive optical network
CN103701532B (en) * 2013-12-27 2017-07-18 武汉电信器件有限公司 A kind of 10G PON OLT optical assembly structures
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