CN102761367B - Optical line terminal optical module - Google Patents
Optical line terminal optical module Download PDFInfo
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- CN102761367B CN102761367B CN201210237884.3A CN201210237884A CN102761367B CN 102761367 B CN102761367 B CN 102761367B CN 201210237884 A CN201210237884 A CN 201210237884A CN 102761367 B CN102761367 B CN 102761367B
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Abstract
The invention discloses a kind of optical line terminal optical module, described optical module includes: the first generating laser, for output after receiving the signal of telecommunication of equipment input and being converted into the optical signal of first wave length；First laser detector, for receiving the optical signal of second wave length, after being converted into the signal of telecommunication, described equipment is arrived in output；Second generating laser, for launching the optical signal of the 3rd wavelength；Second laser detector, for receiving the optical signal of the 3rd wavelength of reflection, and is converted to output after the signal of telecommunication by the optical signal of reception；Breaking point detection module, for sampling to the signal of telecommunication of the second laser detector output, analyze, it is determined that go out breakpoints of optical fiber position.Owing to 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, from without disconnecting optical fiber network system, furthermore, it is possible to ensure that other does not have the normal transmission of the signal of the network at breakpoint place.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology, particularly relate to a kind of optical line terminal optical module.
Background technology
In fiber optic communication systems, the transmission medium of light, such as optical fiber/optical cable, often it is laid on countryside or seabed, the problem such as link failure or transmission equipment fault occurs unavoidably, break down or the position of breakpoint in order to be accurately positioned, generally adopt optical time domain reflectometer (OTDR) to carry out breaking point detection.
In optical fiber telecommunications system as shown in Figure 1, OLT(OpticalLineTerminator, optical line terminal) it is generally arranged at 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 optical signal that outside transmission comes, be translated into the signal of telecommunication and flow to switch.OLT passes through ODN(light feeder network) and ONU(opticalnetunit, optical network unit) be connected, ONU is generally arranged at local side, i.e. user side or building；Splitter generally has 2N to divide equally port for " beam 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, it is usually 1 OLT and is placed on telecommunication center office, then pass through beam splitter, be typically at least 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, having the optical fiber of one section of 10km length, the distance between spliter to ONU1 is the distance between 1km, spliter to ONU2 be the distance between 2km, spilter to ONU3 is 10km.
The optical fiber assumed 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(OpticalTimeDomainReflectometer, optical time domain reflectometer) it is linked in optical fiber telecommunications system.OTDR, by launching light pulse in optical fiber, then receives, at OTDR port, the information returned and is analyzed.When light pulse is transmitted in optical fiber, scattering, reflection can be produced due to the character of optical fiber itself, adapter, abutment, bending or other similar event, the scattering of a portion and reflection return in OTDR, 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 to be formed owing to optical signal produces irregular scattering along optical fiber.OTDR just measures a part of scattering light returning to OTDR port.These backscatter signals have indicated that decay (loss/distance) degree caused by optical fiber.Fresnel reflection is discrete reflection, and it is to be 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 be exactly the information utilizing Fresnel reflection to be located by connecting a little, fibre-optic terminus or breakpoint.
The breakpoints of optical fiber detection method of prior art, has to first disconnect grid in the process carrying out breaking point detection, then connects OTDR and detect, and detection process is complicated so that testing staff detects intricate operation.
And, also affect the normal transmission of the signal of other network not having breakpoint place during detection.Such as, in above-mentioned example, it is only that the optical fiber between spilter to ONU3 there occurs fibercuts, but owing to OLT is broken from network during detecting, thus also result in the signal interruption of ONU1, ONU2.
Therefore, in sum, the breaking point detection method of prior art, in carrying out breaking point detection process, influence whether that other does not have the normal transmission of the signal of the network at breakpoint place；And, detection process is complicated so that testing staff detects intricate operation.
Summary of the invention
The embodiment provides a kind of optical line terminal optical module and breakpoints of optical fiber detection method thereof, with so that breakpoints of optical fiber detection is more convenient, have no effect on the normal transmission of the signal of other fiber optic network not having breakpoint place.
According to an aspect of the invention, it is provided a kind of optical line terminal optical module, including:
Optical path component, it is connected with optical fiber；
First generating laser, communicates with described optical path component light path, output after the signal of telecommunication inputted for desampler the optical signal being converted into first wave length, enters described optical fiber after described optical path component couples；
First laser detector, communicates with described optical path component light path, and for receiving the optical signal of second wave length, after being converted into the signal of telecommunication, described switch is arrived in output；Wherein, the optical 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 optical signal of the 3rd wavelength；The optical signal of the 3rd wavelength enters described optical fiber after described optical path component couples；
Second laser detector, communicates with described optical path component light path, for receiving the optical signal of the 3rd wavelength of reflection, and the optical signal of reception is converted to output after the signal of telecommunication；The optical signal of the 3rd wavelength of described reflection is transferred to the second laser detector from described optical fiber through described optical path component；
Breaking point detection module, for sampling to the signal of telecommunication of the second laser detector output, analyze, it is determined that go out breakpoints of optical fiber position.
Wherein, the second generating laser specifically for receive that described switch sends for, after carrying out the signal of telecommunication of breaking point detection, the optical signal that the signal of telecommunication of reception is converted to the 3rd wavelength being launched.
Breaking point detection module is specifically for obtaining digital signal after the signal of telecommunication of the second laser detector output is sampled, and is compared with the signal under normal circumstances pre-saved by the digital signal obtained, it is determined that go out breakpoint location.
First generating laser specifically includes: the DFB transmitting illuminant of the 1.25Gbps of 1490nm and drive circuit thereof；And first wave length is specially 1490nm；And,
First laser detector specifically includes: the APD pick-up probe of the 1.25Gbps of 1310nm and amplitude limiting amplifier circuit；And second wave length is specially 1310nm.
Second generating laser specifically includes: the OTDRDFB burst transmissions light source of 1625nm and drive circuit thereof；And the 3rd wavelength be specially 1625nm；
Second laser detector specifically includes: the OTDRAPD detector of 1625nm.
Described breaking point detection module specifically includes: gain circuitry, adc circuit, logic array circuit and MCU control circuit；
Described gain circuitry is for, after the signal of telecommunication of the second laser detector output is amplified, being input to described adc circuit；
Described adc circuit is for sampling to the signal of telecommunication of input, and the digital signal of sampling is stored described logic array circuit；
Described logic array circuit compares with the signal under normal circumstances prestored for the digital signal being stored in by described adc circuit, it is determined that breakpoints of optical fiber position；And output optical fibre breakpoint location preserves in described MCU control circuit.
Described optical path component specifically includes:
Coaxial type laser diode module TO-CAN1, optical filter F1, F2 and F3, wherein, TO-CAN1 encapsulates the Laser emission chip of the DFB transmitting illuminant of the 1.25Gbps of the first optical lens and described 1490nm, the optical signal of the light source transmitting chip output of the DFB transmitting illuminant of the 1.25Gbps of described 1490nm is after the first optical lens injection, through the transmission of described optical filter F1, F2 and F3, coupled into optical fibres；
Coaxial type laser diode module TO-CAN2 and optical filter F5, wherein, encapsulates the optical signal detection chip of the APD pick-up probe of the 1.25Gbps of the second optical lens and described 1310nm in TO-CAN2；The optical signal of the 1310nm inputted from described optical fiber, after the reflection of described optical filter F3 and the transmission of optical filter F5 input the second optical lens, enters into the optical signal detection chip of the APD pick-up probe of the 1.25Gbps of described 1310nm；
Coaxial type laser diode module TO-CAN3, wherein encapsulate the Laser emission chip of the OTDRDFB burst transmissions light source of the 3rd optical lens and described 1625nm, the optical 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 transmission of the reflection of described optical filter F2 and optical filter F3, it is coupled into described optical fiber；
Coaxial type laser diode module TO-CAN4 and optical filter F4, wherein, TO-CAN4 encapsulates the optical signal detection chip of the OTDRAPD detector of the 4th optical lens and described 1625nm, from the optical signal of the 1625nm that described optical fiber inputs, transmission through described optical filter F3, F2, with the reflection of described optical filter F1, enter into the optical signal detection chip of the OTDRAPD detector of described 1625nm after the transmission of described optical filter F4 through the 4th optical lens；
Wherein, described optical filter F1 plates the anti-reflection film of 1490nm and the anti-film of increasing of 1625nm, and it is arranged between TO-CAN1 and optical fiber interface, and the center of F1 and the first intersection point coincide, and the optical lens angle at 45 ° of F1 and TO-CAN1, angle at 45 ° with the optical lens of TO-CAN4；First intersection point refers to the extended line of TO-CAN4 and the intersection point of TO-CAN1 and the line of optical fiber interface；
Described optical filter F2 plates the anti-reflection film of 1490nm, the transmission of 1625nm90% and the reflectance coating of 10%, and it is arranged between TO-CAN1 and optical fiber interface, and the center of F2 and the second intersection point coincide, and the optical lens angle at 45 ° of F2 and TO-CAN3；Second intersection point refers to the extended line of TO-CAN3 and the intersection point of TO-CAN1 and the line of optical fiber interface；
Described optical filter F3 plates the anti-reflection film of 1490nm, the anti-reflection film increasing anti-film and 1625nm of 1310nm, and it is arranged between optical filter F2 and optical fiber interface, and the center of F3 and the 3rd intersection point coincide, and the optical lens angle at 45 ° of F3 and TO-CAN2；3rd intersection point refers to the extended line of TO-CAN2 and the intersection point of TO-CAN1 and the line of optical fiber interface；
Described optical filter F4 plates the anti-reflection film of 1625nm, and it is arranged between optical 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 is parallel；
Described optical filter F5 plates the anti-reflection film of 1310nm, and it is arranged between optical 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 is parallel.
It is preferred that the package dimension that described optical module is in the container holding optical line terminal optical module meets the constraint to optical module size of the SFF8432 specification.
It is preferred that the output pin of described optical module is 20；Including:
Pin Tx_Dis_OTDR, controls the enable signal of OTDR in order to desampler；
Pin Data_OTDR, in order to the signal of telecommunication for carrying out breaking point detection that desampler sends；
Pin TX+ and TX-, in order to receive the communication signal of telecommunication of described switch input；
Pin RX+ and RX-, in order to export the communication signal of telecommunication to described switch.
According to another aspect of the present invention, additionally provide a kind of breakpoints of optical fiber detection method, including:
First generating laser of optical line terminal optical module receive the signal of telecommunication of equipment input and be converted into the optical signal of first wave length after output, after described optical path component couples, enter described optical fiber；
After the optical signal of the first laser detector reception second wave length of described optical line terminal optical module is converted into the signal of telecommunication, described equipment is arrived in output；Wherein, the optical signal of second wave length is from described fiber-optic transfer to described optical path component, through the coupled transfer of described optical path component to the first laser detector；
When carrying out breakpoints of optical fiber detection, the optical signal of the second laser transmitter projects the 3rd wavelength of described optical line terminal optical module enters described optical fiber after described optical path component couples；Second laser detector is converted into the signal of telecommunication after receiving the optical signal of the 3rd wavelength of reflection and exports the breaking point detection module of described optical line terminal optical module；
The signal of telecommunication that second laser detector is exported by described breaking point detection module is sampled, is analyzed, it is determined that go out breakpoint location.
The embodiment of the present invention owing to being not only provided with the first generating laser for carrying out optical signal communications and the first laser detector in optical line terminal optical module, and, also it is 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 optical 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, the optical line terminal optical module using 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, and thereby may be ensured that other does not have the normal transmission of 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 the breakpoints of optical fiber detection schematic diagram of prior art；
Fig. 3 is the optical line terminal optical module internal structure circuit block diagram of the embodiment of the present invention；
Fig. 4 is the circuit diagram of the DFB transmitting illuminant of the 1.25Gbps of the 1490nm of the embodiment of the present invention and drive circuit thereof；
Fig. 5 is the circuit diagram of the APD pick-up probe of the 1.25Gbps of the 1310nm of the embodiment of the present invention and amplitude limiting amplifier circuit；
Fig. 6 is the circuit diagram of the OTDRDFB burst transmissions light source of the 1625nm of the embodiment of the present invention and drive circuit thereof；
Fig. 7 is the circuit diagram of the OTDRAPD detector of the 1625nm of the embodiment of the present invention and breaking point detection module；
Fig. 8 is the integrated circuit schematic diagram of the optical line terminal optical module of the ethernet passive optical network being applied to optical access network of the embodiment of the present invention；
Fig. 9 be the optical access network of the embodiment of the present invention ethernet passive optical network in fibercuts schematic diagram；
Figure 10,11 it is the schematic diagram of signal that the OTDRAPD 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.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearly understand, referring to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.However, it is necessary to illustrate, the many details listed in description are only used to make reader that one or more aspects of the present invention are had a thorough explanation, can also realize the aspects of the invention even without these specific details.
The term such as " module " used in this application, " system " is intended to include the entity relevant to computer, for instance but it is not limited to hardware, firmware, combination thereof, software or executory software.Such as, module it may be that it is not limited to: the process run on processor, processor, object, executable program, the thread of execution, program and/or computer.For example, application program and this computing equipment of computing equipment running can be modules.One or more modules may be located in an executory process and/or thread, and module can also on a computer and/or be distributed in two or more between multiple stage computer.
In the technical scheme of the embodiment of the present invention, OTDR function is integrated in the optical module of OLT, and by a kind of optical path component receiving and dispatching 4 road optical signals, it is achieved the optical signal of communication and the optical signal detecting breakpoint transmit simultaneously in a fiber；Thus when carrying out breaking point detection, it is not necessary to disconnect OLT again so that breaking point detection is more convenient, have no effect on the normal transmission of the signal of other network not having 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 of the embodiment of the present invention, as it is shown on figure 3, include: first generating laser the 301, first laser detector the 302, second generating laser the 303, second laser detector 304, breaking point detection module 305, optical path component 306.
Optical path component 306 is connected with optical fiber；Optical path component 306 communicates with the first generating laser 301 light path to communicate to communicate with the second generating laser 303 light path with the first laser detector 302 light path and communicates with the second laser detector 304 light path.
The signal of telecommunication that first generating laser 301 transmits in order to the switch receiving the central office of the access net system being arranged on optical fiber telecommunications system, after electro-optic conversion, launches the optical signal that the signal of telecommunication of reception is converted to first wave length.The optical signal that first generating laser 301 is launched enters into optical fiber after optical path component 306 couples and propagates.Specifically, the SerDes(serializer/deserializer in the first generating laser 301 desampler, or claim switch) signal of telecommunication that sends, the optical signal that the signal of telecommunication of reception is converted to first wave length is launched.
The second wave length optical signal come from fiber-optic transfer is after the light splitting effect of optical path component 306, and the optical signal of second wave length is sent to the first laser detector 302.First laser detector 302, by the optical signal of the second wave length of reception, after opto-electronic conversion, is converted to the signal of telecommunication and is sent to switch, the SerDes(switch of switch) carry out data analysis.
Switch achieves, by the first generating laser 301 and the first laser detector 302, the communication function that signal sends and receives.It is to say, the signal of telecommunication for communicating that the first generating laser 301 desampler sends, it is converted into the optical signal for communicating；First laser detector 302 receives the optical signal for communicating, and is converted into and is sent to switch for the signal of telecommunication communicated.
Second generating laser 303 is for launching the optical signal of the 3rd wavelength, and the optical signal of the 3rd wavelength is the optical signal for detecting breakpoint.The optical signal of the 3rd wavelength that the second laser detector 304 is launched enters into optical fiber after optical path component 306 couples and propagates.The optical signal of the 3rd wavelength transmits in a fiber, reflected at the breakaway poing of optical fiber or the fault place of equipment or other place, the optical signal of the 3rd wavelength reflected transmits in a fiber, after returning to optical path component 306, through the light splitting effect of optical path component 306, the optical signal of the 3rd wavelength being reflected back toward is sent to the second laser detector 304.Specifically, 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 optical signal of the 3rd wavelength: the MAC(MediaAccessControl in switch, medium access controller) when carrying out breaking point detection, sending the signal of telecommunication for carrying out breaking point detection to the second generating laser 303, the optical signal that the signal of telecommunication of reception is converted to the 3rd wavelength is launched by the second generating laser 303.
After second laser detector 304 receives the optical signal of the 3rd wavelength reflected, after opto-electronic conversion, export the signal of telecommunication.
The signal of telecommunication that second laser detector 304 is exported by breaking point detection module 305 is sampled, is analyzed: compared with the signal of telecommunication under normal circumstances pre-saved by the signal of telecommunication of sampling, so that it is determined that the position of breakpoint or trouble point.
Above-mentioned optical line terminal optical module specifically can be applied in the ethernet passive optical network of optical access network.First generating laser 301 of the optical line terminal optical module being applied in the ethernet passive optical network of optical access network specifically includes: the DFB(DistributeFeedBackLaser of the 1.25Gbps of 1490nm, distributed feedback laser) transmitting illuminant and drive circuit thereof.The signal of telecommunication that the SerDes of the drive circuit desampler of the DFB transmitting illuminant of the 1.25Gbps of this 1490nm sends, driving this DFB transmitting illuminant to launch first wave length according to the signal of telecommunication received is the optical signal of 1490nm.The optical signal of the descending continuous transmitting of the optical signal that this DFB transmitting illuminant is launched to be bit rate be 1.25Gbps, and data frame structure meets the protocol requirement of IEEE802.3ah.The DFB transmitting illuminant of the 1.25Gbps of 1490nm and the circuit diagram of drive circuit thereof are as shown in Figure 4, due to the circuit that the DFB transmitting illuminant circuit of this light source driving circuit and the 1.25Gbps of 1490nm is well known to those skilled in the art, no longer it is discussed in detail herein.
First laser detector 302 of the optical line terminal optical module being applied in the ethernet passive optical network of optical access network specifically includes: the APD(AvalanchePhotoDiode of the 1.25Gbps of 1310nm, avalanche photodide) pick-up probe and amplitude limiting amplifier circuit.The optical signal that the second wave length of reception is 1310nm is converted to the signal of telecommunication by APD pick-up probe, amplitude limiting amplifier circuit the signal of telecommunication changed by APD pick-up probe exports after amplifying.What the APD pick-up probe of the 1.25Gbps of this 1310nm received is the signal that bit rate is 1.25Gbps of upper behavior 1310nm, and signal data frame structure meets the protocol requirement of IEEE802.3av.The APD pick-up probe of the 1.25Gbps of 1310nm and the circuit diagram of amplitude limiting amplifier circuit are as shown in Figure 5, due to the circuit that the APD pick-up probe of 1.25Gbps and the amplitude limiting amplifier circuit of this 1310nm are well known to those skilled in the art, no longer it is discussed in detail herein.
Second generating laser 303 of the optical line terminal optical module being applied in the ethernet passive optical network of optical access network specifically may include that OTDRDFB burst transmissions light source and the drive circuit thereof of 1625nm；The drive circuit of the OTDRDFB burst transmissions light source of 1625nm, driving this OTDRDFB burst transmissions light source to launch the 3rd wavelength is the optical signal of 1625nm.Specifically, the signal of telecommunication for carrying out breaking point detection that the MAC of the drive circuit desampler of the OTDRDFB burst transmissions light source of 1625nm sends, driving this OTDRDFB burst transmissions light source to launch the 3rd wavelength according to the signal of telecommunication received is the optical signal of 1625nm.When carrying out breaking point detection, the drive circuit of the OTDRDFB burst transmissions light source that MAC controls 1625nm by TX_Dis_OTDR holding wire (or citing approvingly foot) enables, and sends the signal of telecommunication for carrying out breaking point detection by Data_OTDR this drive circuit of signal alignment；It is the optical signal of 1625nm that this drive circuit drives OTDRDFB burst transmissions light source to launch the 3rd wavelength according to the signal of telecommunication received.
The OTDRDFB burst transmissions light source of 1625nm and the circuit diagram of drive circuit thereof as shown in Figure 6, due to the circuit that OTDRDFB burst transmissions light source and the drive circuit thereof of 1625nm are well known to those skilled in the art, are no longer discussed in detail herein.
Second laser detector 304 of the optical line terminal optical module being applied in the ethernet passive optical network of optical access network is specially the OTDRAPD detector of 1625nm.After the OTDRAPD detector of 1625nm receives the optical signal that the 3rd wavelength is 1625nm reflected, after opto-electronic conversion, export the signal of telecommunication.
The breaking point detection module 305 of the optical line terminal optical module being applied in the ethernet passive optical network of optical access network specifically may include that gain circuitry and ADC(analog digital conversion) circuit, and logic array circuit and MCU control circuit.The OTDRAPD detector of 1625nm and the circuit diagram of breaking point detection module 305, as it is shown in fig. 7, the circuit that is well known to those skilled in the art due to the OTDRAPD detector circuit of 1625nm, are no longer discussed in detail herein.
The signal of telecommunication that the OTDRAPD detector of 1625nm exports is amplified by the gain circuitry of breaking point detection module 305, it is input in adc circuit, the signal of telecommunication is sampled by adc circuit, obtains digital signal, and is stored in logic array circuit by the digital signal of sampling.The digital signal that adc circuit is stored in by logic array circuit be stored in advance in storage medium such as FLASH(flash memory) in signal under normal circumstances compare, pass through logical operations, determine the position of breakpoints of optical fiber or trouble point, and by the interface between MCU control circuit, the position of breakpoint or trouble point is sent to MCU control circuit and preserves.The MAC of switch can pass through to access MCU control circuit and obtain the position of breakpoints of optical fiber or trouble point.Logic array circuit can be specifically FPGA(FieldProgrammableGataArray, field programmable gate array), PAL(programmable logic array) etc. circuit.Obviously, those skilled in the art can also adopt other device, compares as the computing chips such as single-chip microcomputer, processor, micro controller realize signal, it is determined that the function of breakpoint or position of failure point.
The position that MCU control circuit obtains breakpoint or trouble point from logic array circuit stores.MCU control circuit can be specifically the single-chip microcomputer of various model, controller, processor etc..
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 MAC instruction sent simultaneously, the work of the first generating laser 301 or the work of the second generating laser 303 is controlled according to instruction.
It is applied to the integrated circuit schematic diagram of the optical line terminal optical module of the ethernet passive optical network of optical access network, as shown in Figure 8, the DFB transmitting illuminant of 1.25Gbps and drive circuit thereof including above-mentioned 1490nm, and the APD pick-up probe of the 1.25Gbps of 1310nm and amplitude limiting amplifier circuit, and the OTDRDFB burst transmissions light source of 1625nm and drive circuit thereof, and the OTDRAPD detector of 1625nm and gain circuitry, adc circuit, logic array circuit and MCU control circuit.MCU control circuit therein can be additionally used in mode of operation or the duty of the drive circuit of the DFB transmitting illuminant of the 1.25Gbps controlling 1490nm.
The operation principle of the optical line terminal optical module being applied to the ethernet passive optical network of optical access network is as follows:
The optical line terminal optical module being applied to the ethernet passive optical network of optical access network can communicate work and breaking point detection work simultaneously, or only communicates work.
The communication work principle of the optical line terminal optical module being applied to the ethernet passive optical network of optical access network is:
The signal of telecommunication that the drive circuit desampler of the DFB transmitting illuminant of the 1.25Gbps of 1490nm transmits, driving this DFB transmitting illuminant to launch first wave length is the optical signal of 1490nm.The Distributed Feedback Laser of 1490nm uses as the light source of downlink, sends the optical signal of continuous print 1.25Gbps, it is achieved the transmission of communication data.
The APD detector of 1310nm receives and is sent uplink burst light bag by ONU, converts optical signals to the signal of telecommunication, amplitude limiting amplifier circuit the signal of telecommunication changed by APD pick-up probe exports switch after amplifying, it is achieved the reception of communication data.
It is applied to the breaking point detection operation principle of the optical line terminal optical module of the ethernet passive optical network of optical access network:
When optical fiber link generation breakpoint, the OTDRDFB burst transmissions light source of 1625nm sends a series of burst laser under the effect of its drive circuit；Laser breakpoint in optical fiber link, due to Rayleigh scattering and Fresnel reflection, understands some return loss luminous reflectance back into optical fibers, the laser of reflection and then return to the OTDRAPD detector of 1625nm.The OTDRAPD detector of 1625nm receives the light reflected, and through photoelectric conversion, forms the signal of telecommunication, is then passed through gain circuitry and amplifies the sampling with adc circuit, obtains digital signal and pass to logic array circuit FPGA.The signal under normal circumstances deposited in the signal received and Flash is compared by FPGA, finds the position that breakpoint occurs, and breakpoint location is passed to MCU control circuit by SPI interface by FPGA.The MAC of switch, by accessing MCU control circuit, learns the position that breakpoint occurs.
Fig. 9 illustrates fibercuts situation in the ethernet passive optical network of optical access network: be applied to the optical line terminal optical module of ethernet passive optical network of optical access network between spliter, there is the optical fiber of one section of 10km length, 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 of 1625nm launches laser signal, and OTDRAPD detector receives signal as shown in Figure 10.Can be seen that from the signal shown in Figure 10, at optical line terminal optical module distance 10km place, reflection due to 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, reflection due to spliter, detecting 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, it is possible to judgement is the circuit between spliter to ONU3 occurs in that breakpoint, this breakpoint distance light road terminal optical module 17km.
Assume after OTDR luminescence, receive the reflection peak (as shown in figure 11) of breakpoint at T2 time point, then the distance of distance light road, breakpoint place terminal optical module calculates according to equation below 1 and obtains:
In formula 1, c=3 × 108M/s, for the light velocity, 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.
It is applied to after the optical line terminal optical module of the ethernet passive optical network of optical access network is packaged, itself and external equipment, MAC or SerDes of such as switch, the definition of the pin being connected (pin) is as shown in table 1 below:
Table 1
As can be seen from Table 1, the output pin after optical line terminal optical module encapsulation is 20.Wherein, relevant to the OTDR function of optical line terminal optical module pin includes:
Pin 2, Tx_Dis_OTDR: control the enable signal of OTDR in order to desampler, namely switch controls the enable of the drive circuit of the OTDRDFB burst transmissions light source of 1625nm by this pin；
Pin 9, Data_OTDR: in order to receive the signal of telecommunication for carrying out breaking point detection, namely switch sends the signal of telecommunication for carrying out breaking point detection by the drive circuit of this pin OTDRDFB burst transmissions light source to 1625nm.
The pin relevant to the communication function of optical line terminal optical module includes:
Pin 18 and 19, i.e. TX+ and TX-pin: in order to the communication signal of telecommunication of desampler input, namely switch sends the signal of telecommunication by the drive circuit of the DFB transmitting illuminant of the 1.25Gbps of pin 18 and 19 to 1490nm；
Pin 12 and 13, i.e. RX+ and RX-pin: switch receives the signal of telecommunication of the amplitude limiting amplifier circuit output of the APD pick-up probe of the 1.25Gbps of 1310nm by pin 12 and 13.
The relevant pins controlling optical line terminal optical module includes:
Pin 4 and pin 5, i.e. SDA and SCL pin: switch is realized and the communicating of MCU control circuit by pin 4 and pin 5.Specifically, switch sends instruction by pin 4 and pin 5 to MCU control circuit, and receives, by pin 4 and pin 5, the 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, including 4 TO-CAN(TransistorOutlineCAN, coaxial type laser diode module) and 5 optical filters.4 TO-CAN are respectively as follows: TO-CAN1, TO-CAN2, TO-CAN3, TO-CAN4.5 optical filters are respectively as follows: F1, F2, F3, F4, F5.
Wherein, the DFB transmitting illuminant light path of the 1.25Gbps of coaxial type laser diode module TO-CAN1 and 1490nm communicates, and is positioned at the high order end of optical path component, relative with the optical fiber interface of optical path component 306.Specifically, the light source transmitting chip of the DFB transmitting illuminant of the 1.25Gbps of 1490nm and the first optical lens are packaged in TO-CAN1.The optical signal that the DFB transmitting illuminant of the 1.25Gbps of 1490nm sends penetrates after the first optical lens, through the transmission of optical filter F1, F2 and F3, coupled into optical fibres, carries out the transmission of signal.
The APD pick-up probe light path of the 1.25Gbps of coaxial type laser diode module TO-CAN2 and 1310nm communicates, and is positioned at the right-hand member above optical path component, perpendicular with the line of TO-CAN1 and optical fiber interface.Specifically, the optical signal detection chip of the APD pick-up probe of the 1.25Gbps of 1310nm and the second optical lens are packaged in TO-CAN2.It is input to the optical signal of 1310nm 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 1.25Gbps of 1310nm through the second optical lens.
The OTDRDFB burst transmissions light source optical path of coaxial type laser diode module TO-CAN3 and 1625nm communicates, and is positioned at the lower section of optical path component, perpendicular with the line of TO-CAN1 and optical fiber interface.Specifically, the light source transmitting chip of the OTDRDFB burst transmissions light source of 1625nm and the 3rd optical lens are packaged in TO-CAN3.The optical signal that the light source transmitting chip of the OTDRDFB burst transmissions light source of 1625nm sends is after the 3rd optical lens injection, through reflection and the transmission of F3, the coupled into optical fibres of F2.
The OTDRAPD 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.Specifically, the optical signal detection chip of the OTDRAPD detector of 1625nm and the 4th optical lens are packaged in TO-CAN4.The optical signal of the 1625nm of optical path component 306 it is input to from optical fiber, through the transmission of F3, F2, and the reflection of F1, after the optical lens of TO-CAN4, enter into the optical signal detection chip of the OTDRAPD detector of described 1625nm after the transmission of F4.
Optical filter F1 plates the anti-reflection film of 1490nm and the anti-film of increasing of 1625nm, and it is arranged between TO-CAN1 and optical fiber interface, and the center of F1 and the first intersection point coincide, and the optical lens angle at 45 ° of F1 and TO-CAN1, angle at 45 ° with the optical lens of TO-CAN4；First intersection point refers to the extended line of TO-CAN4 and the intersection point of TO-CAN1 and the line of optical fiber interface.On F1, how to plate the anti-reflection film of 1490nm and the anti-film of increasing of 1625nm, so that F1 can pass through the light of 1490nm wavelength, and the technology that the light reflecting 1625nm wavelength is well known to those skilled in the art, repeat no more herein.
Optical filter F2 plates the anti-reflection film of 1490nm, the transmission of 1625nm90% and the reflectance coating of 10%, and it is arranged between TO-CAN1 and optical fiber interface, and the center of F2 and the second intersection point coincide, and the optical lens angle at 45 ° of F2 and TO-CAN3；Second intersection point refers to the extended line of TO-CAN3 and the intersection point of TO-CAN1 and the line of optical fiber interface.On F2, how to plate the anti-reflection film of 1490nm, the transmission of 1625nm90% and the reflectance coating of 10%, so that F2 can pass through the light of 1490nm wavelength, the light of the 1625nm wavelength of projection 90%, the technology that the light of the 1625nm wavelength of reflection 10% is well known to those skilled in the art, repeats no more herein.
Optical filter F3 plates the anti-reflection film increasing anti-film and 1625nm of the anti-reflection film of 1490nm, 1310nm, and it is arranged between optical filter F2 and optical fiber interface, and the center of F3 and the 3rd intersection point coincide, and the optical lens angle at 45 ° of F3 and TO-CAN2；3rd intersection point refers to the extended line of TO-CAN2 and the intersection point of TO-CAN1 and the line of optical fiber interface.On F3, how to plate the anti-reflection film increasing anti-film and 1625nm of the anti-reflection film of 1490nm, 1310nm, so that F3 can pass through the light of 1490nm wavelength, the light of reflection 1310nm wavelength, through the technology that the light of 1625nm wavelength is well known to those skilled in the art, repeats no more herein.
Optical filter F4 plates the anti-reflection film of 1625nm, and it is arranged between optical 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 is parallel.On F4, how to plate the anti-reflection film of 1625nm, so that F4 can pass through the technology that the light of 1625nm wavelength is well known to those skilled in the art, repeat no more herein.
Optical filter F5 plates the anti-reflection film of 1310nm, and it is arranged between optical 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 is parallel.On F5, how to plate the anti-film of increasing of 1310nm, so that F5 can pass through the technology that the light of 1310nm wavelength is well known to those skilled in the art, repeat no more herein.
Optical line terminal optical module owing to being applied in the ethernet passive optical network of optical access network does not increase the optical module of OTDR function before comparing, add some circuit and device, thus causing that the encapsulation SFP+ light module package of former optical module cannot hold the optical line terminal optical module of the embodiment of the present invention, thus, a kind of new optical line terminal optical module encapsulation that the embodiment of the present invention provides, with reference to the SFF8432 constraint to SFP+ optical module overall dimensions, the package dimension making new optical line terminal optical module meets SFF8432 specification in the size within Case, i.e. miniaturization pluggable optical module (SFP+, SmallFormFactorPluggable) 8432 specifications constraint to optical module size: it highly keeps identical with the height of SFP+ light module package, suitable widens, add long process, thus the optical line terminal optical module of the embodiment of the present invention both can be held, ensureing that again the encapsulation of new optical line terminal optical module ensures to hold the container of optical line terminal optical module at Case() internal size meets the SFF8432 constraint to optical module size.
Although the embodiment of the present invention being the physical circuit of specifically telling about the optical line terminal optical module being integrated with OTDR function in detail of the optical line terminal optical module in the ethernet passive optical network to be applied to optical access network, obviously, those skilled in the art can integrated OTDR function in the easy realization of content disclosed in the technical scheme optical line terminal optical module in other type of optical-fiber network according to embodiments of the present invention, such as, integrated OTDR function in the optical line terminal optical module in being applied to ten gigabit passive optical networks or gigabit passive optical network.Therefore, without departing from the principles of the invention, the optical line terminal optical module in other optical-fiber network realizes OTDR function and be regarded as protection scope of the present invention.
The embodiment of the present invention owing to being not only provided with the first generating laser for carrying out optical signal communications and the first laser detector in optical line terminal optical module, and, also it is 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 optical 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, the optical line terminal optical module using 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, and thereby may be ensured that other does not have the normal transmission of the signal of the network at breakpoint place.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method can be by the hardware that program carrys out instruction relevant and completes, 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 making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. an optical line terminal optical module, it is characterised in that including:
Optical path component, it is connected with optical fiber；
First generating laser, communicates with described optical path component light path, output after the signal of telecommunication inputted for desampler the optical signal being converted into first wave length, enters described optical fiber after described optical path component couples；
First laser detector, communicates with described optical path component light path, and for receiving the optical signal of second wave length, after being converted into the signal of telecommunication, described switch is arrived in output；Wherein, the optical 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 optical signal of the 3rd wavelength；The optical signal of the 3rd wavelength enters described optical fiber after described optical path component couples；
Second laser detector, communicates with described optical path component light path, for receiving the optical signal of the 3rd wavelength of reflection, and the optical signal of reception is converted to output after the signal of telecommunication；The optical signal of the 3rd wavelength of described reflection is transferred to the second laser detector from described optical fiber through described optical path component；
Breaking point detection module, for sampling to the signal of telecommunication of the second laser detector output, analyze, it is determined that go out breakpoints of optical fiber position；
First generating laser specifically includes: the DFB transmitting illuminant of the 1.25Gbps of 1490nm and drive circuit thereof；And first wave length is specially 1490nm；And,
First laser detector specifically includes: the APD pick-up probe of the 1.25Gbps of 1310nm and amplitude limiting amplifier circuit；And second wave length is specially 1310nm；
Second generating laser specifically includes: the OTDRDFB burst transmissions light source of 1625nm and drive circuit thereof；And the 3rd wavelength be specially 1625nm；
Second laser detector specifically includes: the OTDRAPD detector of 1625nm；
Described optical path component includes coaxial type laser diode module TO-CAN1, coaxial type laser diode module TO-CAN2, coaxial type laser diode module TO-CAN3 and coaxial type laser diode module TO-CAN4, wherein,
The DFB transmitting illuminant light path of the 1.25Gbps of coaxial type laser diode module TO-CAN1 and 1490nm communicates, and is positioned at the high order end of optical path component, relative with the optical fiber interface of optical path component；
The APD pick-up probe light path of the 1.25Gbps of coaxial type laser diode module TO-CAN2 and 1310nm communicates, and is positioned at the right-hand member above optical path component, perpendicular with the line of TO-CAN1 and optical fiber interface；
The OTDRDFB burst transmissions light source optical path of coaxial type laser diode module TO-CAN3 and 1625nm communicates, and is positioned at the lower section of optical path component, perpendicular with the line of TO-CAN1 and optical fiber interface；
The OTDRAPD 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.
2. optical module as claimed in claim 1, it is characterised in that
Second generating laser specifically for receive that described switch sends for, after carrying out the signal of telecommunication of breaking point detection, the optical signal that the signal of telecommunication of reception is converted to the 3rd wavelength being launched.
3. optical module as claimed in claim 2, it is characterised in that
Breaking point detection module is specifically for obtaining digital signal after the signal of telecommunication of the second laser detector output is sampled, and is compared with the signal under normal circumstances pre-saved by the digital signal obtained, it is determined that go out breakpoint location.
4. optical module as claimed in claim 1, it is characterised in that described optical path component also includes optical filter F1, F2, F3, f4 and f5；Wherein,
TO-CAN1 encapsulates the Laser emission chip of the DFB transmitting illuminant of the 1.25Gbps of the first optical lens and described 1490nm, the optical signal of the light source transmitting chip output of the DFB transmitting illuminant of the 1.25Gbps of described 1490nm is after the first optical lens injection, through the transmission of described optical filter F1, F2 and F3, coupled into optical fibres；
TO-CAN2 encapsulates the optical signal detection chip of the APD pick-up probe of the 1.25Gbps of the second optical lens and described 1310nm；The optical signal of the 1310nm inputted from described optical fiber, after the reflection of described optical filter F3 and the transmission of optical filter F5 input the second optical lens, enters into the optical signal detection chip of the APD pick-up probe of the 1.25Gbps of described 1310nm；
TO-CAN3 encapsulates the Laser emission chip of the OTDRDFB burst transmissions light source of the 3rd optical lens and described 1625nm, the optical 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 transmission of the reflection of described optical filter F2 and optical filter F3, it is coupled into described optical fiber；
TO-CAN4 encapsulates the optical signal detection chip of the OTDRAPD detector of the 4th optical lens and described 1625nm, from the optical signal of the 1625nm that described optical fiber inputs, transmission through described optical filter F3, F2, with the reflection of described optical filter F1, enter into the optical signal detection chip of the OTDRAPD detector of described 1625nm after the transmission of described optical filter F4 through the 4th optical lens；
Wherein, described optical filter F1 plates the anti-reflection film of 1490nm and the anti-film of increasing of 1625nm, and it is arranged between TO-CAN1 and optical fiber interface, and the center of F1 and the first intersection point coincide, and the optical lens angle at 45 ° of F1 and TO-CAN1, angle at 45 ° with the optical lens of TO-CAN4；First intersection point refers to the extended line of TO-CAN4 and the intersection point of TO-CAN1 and the line of optical fiber interface；
Described optical filter F2 plates the anti-reflection film of 1490nm, the transmission of 1625nm90% and the reflectance coating of 10%, and it is arranged between TO-CAN1 and optical fiber interface, and the center of F2 and the second intersection point coincide, and the optical lens angle at 45 ° of F2 and TO-CAN3；Second intersection point refers to the extended line of TO-CAN3 and the intersection point of TO-CAN1 and the line of optical fiber interface；
Described optical filter F3 plates the anti-reflection film of 1490nm, the anti-reflection film increasing anti-film and 1625nm of 1310nm, and it is arranged between optical filter F2 and optical fiber interface, and the center of F3 and the 3rd intersection point coincide, and the optical lens angle at 45 ° of F3 and TO-CAN2；3rd intersection point refers to the extended line of TO-CAN2 and the intersection point of TO-CAN1 and the line of optical fiber interface；
Described optical filter F4 plates the anti-reflection film of 1625nm, and it is arranged between optical 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 is parallel；
Described optical filter F5 plates the anti-reflection film of 1310nm, and it is arranged between optical 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 is parallel.
5. optical module as claimed in claim 1, it is characterised in that its package dimension in the container holding optical line terminal optical module meets the constraint to optical module size of the SFF8432 specification.
6. optical module as claimed in claim 5, it is characterised in that its output pin is 20；Including:
Pin Tx_Dis_OTDR, controls the enable signal of OTDR in order to desampler；
Pin Data_OTDR, in order to the signal of telecommunication for carrying out breaking point detection that desampler sends；
Pin TX+ and TX-, in order to receive the communication signal of telecommunication of described switch input；
Pin RX+ and RX-, in order to export the communication signal of telecommunication to described switch.
7. optical module as claimed in claim 1, described breaking point detection module includes gain circuitry, adc circuit, logic array circuit and MCU control circuit；
Described gain circuitry is for, after the signal of telecommunication of the second laser detector output is amplified, being input to described adc circuit；
Described adc circuit is for sampling to the signal of telecommunication of input, and the digital signal of sampling is stored described logic array circuit；
Described logic array circuit compares with the signal under normal circumstances prestored for the digital signal being stored in by described adc circuit, it is determined that breakpoints of optical fiber position；And output optical fibre breakpoint location preserves in described MCU control circuit.
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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 |
| CN103078676A (en) * | 2013-01-29 | 2013-05-01 | 青岛海信宽带多媒体技术有限公司 | Passive compatible optical network and optical-network-unit optical module thereof |
| CN103259599B (en) * | 2013-04-18 | 2016-11-09 | 青岛海信宽带多媒体技术有限公司 | EPON and double-standard optical line terminal optical module |
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