CN103078676A - Passive compatible optical network and optical-network-unit optical module thereof - Google Patents
Passive compatible optical network and optical-network-unit optical module thereof Download PDFInfo
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- CN103078676A CN103078676A CN2013100338579A CN201310033857A CN103078676A CN 103078676 A CN103078676 A CN 103078676A CN 2013100338579 A CN2013100338579 A CN 2013100338579A CN 201310033857 A CN201310033857 A CN 201310033857A CN 103078676 A CN103078676 A CN 103078676A
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Abstract
The invention discloses a passive compatible optical network and an optical module of an optical network unit thereof. In the optical network, an optical module of an optical line terminal is used for transmitting optical signals with a first wavelength and a fourth wavelength as descending optical signals and receiving optical signals with a second wavelength and a fifth wavelength as ascending optical signals, and is also used for sending optical signals for detecting a third wavelength of a breaking point, carrying out sampling and analysis on the reflected optical signals with the third wavelength after the reflected optical signals with the third wavelength are received and determining the positions of the breaking points of optical fiber; and an optical module of the optical network unit is used for the optical signals with the first/fourth wavelength, transmitting the optical signals with the second wavelength/the fifth wavelength and reflecting the optical signals with the third wavelength. The invention has the advantages that since the OLT can be used for transmitting and receiving the optical signals with the third wavelength for detecting the breaking points when the transmission of the ascending and descending signals is not influenced, and the ONU (Optical Network Unit) optical module can reflect the optical signals for detecting the breaking points, so that the detection of the breaking points of the optical fiber is more convenient.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology, relate in particular to a kind of passive compatible optical-fiber network and optical network unit optical module thereof.
Background technology
In optical fiber telecommunications system, the transmission medium of light, such as optical fiber/optical cable, often be laid on countryside or seabed, the problems such as link failure or transmission equipment fault appear unavoidably, to break down or the position of breakpoint in order can accurately locating, usually to adopt optical time domain reflectometer (OTDR) to carry out breaking point detection.
In optical fiber telecommunications system as shown in Figure 1, OLT(Optical Line Terminator, optical line terminal) usually is 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 the switch is converted into optical signal data and sends, and receive the outside light signal that sends, be translated into the signal of telecommunication and flow to switch.OLT is by ODN(light feeder network) and ONU(opticalnet unit, optical network unit) link to each other, 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, generally be that 1 OLT is placed on telecommunication center office, by optical splitter, generally be 1 minute 32 at least then, perhaps 1 minute 64 even 1 minutes 128, namely 1 OLT was with 32 or 64 or 128 ONU.Generally include ONU optical module and ONU system equipment among the ONU.
Wherein, from OLT to spliter between, the long optical fiber of one section 10km is arranged, spliter is 1km to the distance between the ONU1, spliter is 2km to the distance between the ONU2, spilter is 10km to the distance between the ONU3.
Suppose at the 7km place fibercuts to have occured to the optical fiber between the ONU3 at spilter, the schematic diagram of the breaking point detection method of prior art is as shown in Figure 2: disconnect being connected between OLT and the optical fiber, with OTDR(Optical Time Domain Reflectometer, optical time domain reflectometer) be linked in the optical fiber telecommunications system.OTDR, then receives the information of returning at the OTDR port and analyzes in optical fiber by the utilizing emitted light pulse.When light pulse is transmitted in optical fiber, can produce scattering, reflection owing to character, connector, junction point, bending or other similar event of optical fiber itself, wherein the scattering of a part and reflection will turn back among the OTDR, the useful information that returns is measured by the detector of OTDR, and they are just as the time on the diverse location in the optical fiber or curve segment.OTDR characterizes the characteristic of optical fiber with Rayleigh scattering and Fresnel reflection.Rayleigh scattering is to form owing to light signal produces irregular scattering along optical fiber.OTDR just measures a part of scattered light of getting back to the OTDR port.These backscatter signals have just shown decay (loss/distance) degree that is caused by optical fiber.Fresnel reflection is the reflection of dispersing, and it causes by the indivedual points in the whole piece optical fiber, and these points are comprised of the factor that causes 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 some fibre-optic terminus or breakpoint.
The breakpoints of optical fiber detection method of prior art, then the first parting system network of having in the process of carrying out breaking point detection connects OTDR and detects, and testing process is complicated, so that testing staff's testing is loaded down with trivial details.
And, also can have influence on the normal transmission of the signal of other network that does not have the breakpoint place between detection period.For example, in the above-mentioned example, only be that spilter to the optical fiber between the ONU3 fibercuts has occured, yet between detection period because OLT is broken from network, thereby also caused the signal interruption of ONU1, ONU2.
Therefore, in sum, the breaking point detection method of prior art can have influence on the normal transmission of the signal of other network that does not have the breakpoint place in carrying out the breaking point detection process; And testing process is complicated, so that testing staff's testing is loaded down with trivial details.
Summary of the invention
Embodiments of the invention provide a kind of passive compatible optical-fiber network and optical network unit optical module thereof, with so that the breakpoints of optical fiber detection is more convenient, do not have influence on the normal transmission of the signal of other fiber optic network that does not have the breakpoint place.
According to an aspect of the present invention, provide a kind of passive compatible optical-fiber network, having comprised: optical line terminal and optical network unit, wherein,
The optical module of described optical line terminal be used for the light signal of emission the first wavelength and the 4th wavelength as downlink optical signal, and the light signal of reception second wave length and the 5th wavelength is as uplink optical signal; And also launch light signal for detection of the three-wavelength of breakpoint, and and after receiving the light signal of the three-wavelength that reflects, the light signal of the three-wavelength of reflection is sampled, analyzed, determine the breakpoints of optical fiber position;
The optical module of described optical network unit is used for receiving the light signal of the first wavelength/the 4th wavelength, the light signal of emission second wave length/the 5th wavelength, and reflects the light signal of three-wavelength.
Wherein, the optical module of described optical line terminal comprises:
Optical path component, it links to each other with optical fiber;
The first generating laser communicates with described optical path component light path, exports after being used for the signal of telecommunication of desampler input and being converted into the light signal of the first wavelength, enters described optical fiber after described optical path component coupling;
The first laser detector communicates with described optical path component light path, be used for to receive 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;
The second generating laser communicates with described optical path component light path, is used for the light signal of emission three-wavelength; The light signal of three-wavelength enters described optical fiber after described optical path component coupling;
The second laser detector communicates with described optical path component light path, be used for to receive the light signal of the three-wavelength of reflection, and exports after the light signal that receives 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;
The breaking point detection module is used for the signal of telecommunication of the second laser detector output is sampled, analyzed, and determines the breakpoints of optical fiber position;
The 3rd generating laser communicates with described optical path component light path, exports after being used for the signal of telecommunication of desampler input and being converted into the light signal of the 4th wavelength, enters described optical fiber after described optical path component coupling;
The 3rd laser detector communicates with described optical path component light path, be used for to receive the light signal of the 5th wavelength, outputs to described switch after being converted into the signal of telecommunication; Wherein, the light signal of the 5th wavelength is transferred to the 3rd laser detector from described optical fiber through described optical path component.
The optical module of described optical network unit comprises:
Optical path component links to each other with optical fiber by its optical interface, is used for the light signal of transmission the first wavelength/the 4th wavelength, second wave length/the 5th wavelength, reflects the light signal of three-wavelength;
Generating laser communicates with described optical path component light path, exports behind the light signal that is used for receiving the signal of telecommunication of optical network unit system equipment transmission and being converted into second wave length/the 5th wavelength, enters described optical fiber after described optical path component coupling;
Laser detector communicates with described optical path component light path, be used for to receive the light signal of the first wavelength/the 4th wavelength, outputs to described optical network unit system equipment after being converted into the signal of telecommunication.
Wherein, the optical path component in the optical module of optical network unit comprises:
The first wavelength-division multiplex element is arranged at along on the optical axis direction of the optical interface of described optical path component, to the light signal transmission of the first wavelength and second wave length, to the light signal reflection of three-wavelength;
Coaxial type laser diode module TO-CAN5 wherein is packaged with DFB transmitting illuminant and the 5th optical lens of described generating laser; The optical axis of the optical axis of the DFB transmitting illuminant that encapsulates among the described TO-CAN5 and the optical interface of described optical path component 1403 is positioned at same straight line;
Coaxial type laser diode module TO-CAN6 wherein is packaged with APD pick-up probe and the 6th optical lens in the described laser detector; The optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5 is vertical;
The second wavelength-division multiplex element is arranged between the optical interface of described TO-CAN5 and described optical path component, and its center and the 4th intersection point coincide, and with described TO-CAN5 in the angle of optical axis of the DFB transmitting illuminant that encapsulates be acute angle; Wherein, the 4th intersection point is the intersection point of the optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5; The second wavelength-division multiplex element is used for the light signal of the second wave length of the DFB transmitting illuminant emission that the described TO-CAN5 of transmission encapsulates, the APD pick-up probe that the light signal that reflects the first wavelength encapsulates in the described TO-CAN6.
Further, the optical path component in the optical module of optical network unit also comprises:
The 3rd wavelength division multiplexing element is arranged between the 4th intersection point and the described TO-CAN6, and vertical with the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6, is used for the light signal of transmission the first wavelength/the 4th wavelength, to the light signal reflection of other wave band.
Preferably, described passive compatible optical-fiber network is specially the EPON of compatible gigabit and ten gigabits; Wherein, the light signal of the first wavelength is the light signal of 1490nm, and the light signal of second wave length is the light signal of 1310nm, and the light signal of three-wavelength is the light signal of 1625nm, the light signal of the 4th wavelength is the light signal of 1577nm, and the light signal of the 5th wavelength is the light signal of 1270nm.
According to another aspect of the present invention, also provide a kind of optical network unit optical module, having comprised: generating laser and laser detector; And also comprise: optical path component; Described optical path component comprises:
The first wavelength-division multiplex element is arranged at along on the optical axis direction of the optical interface of described optical path component, to the light signal transmission of the first wavelength/the 4th wavelength and second wave length/the 5th wavelength, to the light signal reflection of three-wavelength;
Coaxial type laser diode module TO-CAN5 wherein is packaged with DFB transmitting illuminant and the 5th optical lens of described generating laser; The optical axis of the optical axis of the DFB transmitting illuminant that encapsulates among the described TO-CAN5 and the optical interface of described optical path component 1403 is positioned at same straight line;
Coaxial type laser diode module TO-CAN6 wherein is packaged with APD pick-up probe and the 6th optical lens in the described laser detector; The optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5 is vertical;
The second wavelength-division multiplex element is arranged between the optical interface of described TO-CAN5 and described optical path component, and its center and the 4th intersection point coincide, and with described TO-CAN5 in the angle of optical axis of the DFB transmitting illuminant that encapsulates be acute angle; Wherein, the 4th intersection point is the intersection point of the optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5; The second wavelength-division multiplex element is used for the light signal of the second wave length of the DFB transmitting illuminant emission that the described TO-CAN5 of transmission encapsulates/the 5th wavelength, the APD pick-up probe that the light signal that reflects the first wavelength/the 4th wavelength encapsulates in the described TO-CAN6.
Wherein, described optical path component also comprises:
The 3rd wavelength division multiplexing element is arranged between the 4th intersection point and the described TO-CAN6, and vertical with the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6, is used for the light signal of transmission the first wavelength/the 4th wavelength, to the light signal reflection of other wave band;
Isolator is arranged between the 4th intersection point and the described TO-CAN5, and vertical with the optical axis of the DFB transmitting illuminant that encapsulates among the described TO-CAN5, is used for the light signal of the second wave length of the described DFB transmitting illuminant emission of one direction transmission/the 5th wavelength.
Preferably, the first wavelength-division multiplex element is filter or the film that is coated with reflectance coating, perhaps is the plated film on the ferrule endface of described optical interface; And
Described the first wavelength-division multiplex element to the reflectivity of the light signal of three-wavelength more than or equal to 10%; And
The second wavelength-division multiplex element is to be coated with the first wavelength/the 4th wavelength and the second wave length/anti-reflection film of the 5th wavelength, the filter that increases anti-film of three-wavelength; And
The 3rd wavelength division multiplexing element is the filter that is coated with the anti-reflection film of the first wavelength/the 4th wavelength.
Preferably, described optical path component is packaged among the BOSA; And
Described TO-CAN5 is fixed on the left side of the metal shell of described BOSA; Described optical interface is fixed on the right side of the metal shell of described BOSA; Described TO-CAN6 is fixed on the upside of described metal shell; Second, third wavelength division multiplexing element is fixed on the inner carriage of described metal shell.
The embodiment of the invention is because OLT can transmit and receive the light signal for detection of the three-wavelength of breakpoint when not affecting transmission uplink and downlink light signal, so that carrying out to disconnect optical fiber network system when breakpoints of optical fiber detects, and can guarantee the normal transmission of the signal of the network that other does not have the breakpoint place, be more convenient for carrying out breaking point detection;
And the ONU optical module can reflect the light signal for detection of breakpoint, is convenient to determine the position of ONU in optical-fiber network, take the position of ONU as basis, the breaking point detection of being more convenient for.
Description of drawings
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 a is the optical signal transmission schematic diagram between OLT and the ONU in the EPON of the embodiment of the invention;
Fig. 3 b is the optical line terminal optical module internal structure circuit block diagram of the embodiment of the invention;
Fig. 4 is the DFB transmitting illuminant of the embodiment of the invention and the circuit diagram of drive circuit thereof;
Fig. 5 is the APD pick-up probe of the embodiment of the invention and the circuit diagram of amplitude limiting amplifier circuit;
Fig. 6 is the OTDR DFB burst transmissions light source of the embodiment of the invention and the circuit diagram of drive circuit thereof;
Fig. 7 is the OTDR APD detector of the embodiment of the invention and the circuit diagram of breaking point detection module;
Fig. 8 is fibercuts schematic diagram in the ethernet passive optical network of optical access network of the embodiment of the invention;
Fig. 9,10 is the schematic diagram of the signal that receives of the OTDRAPD detector of the embodiment of the invention;
Figure 11 is the ONU optical module internal structure circuit block diagram of the embodiment of the invention;
Figure 12,13 is the optical path component internal structure schematic diagram in the ONU optical module of the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.Yet, need to prove, many details of listing in the specification only are in order to make the reader to one or more aspects of the present invention a thorough understanding be arranged, even if there are not these specific details also can realize these aspects of the present invention.
The terms such as " module " used in this application, " system " are intended to comprise the entity relevant with computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.For example, module can be, but be not limited in: the thread of the process of moving on the processor, processor, object, executable program, execution, program and/or computer.For instance, the application program of moving on the computing equipment and this computing equipment can be modules.One or more modules can be positioned at an executory process and/or thread, and module also can be on the computer and/or be distributed between two or more the computers.
In the technical scheme of the embodiment of the invention, the OTDR function is integrated in the optical module (being called for short the OLT optical module) of OLT, and by a kind of optical path component of receiving and dispatching multipath light signal, realize that the light signal of communication and the light signal that detects breakpoint transmit simultaneously in optical fiber; Thereby when carrying out breaking point detection, needn't disconnect again OLT, so that breaking point detection is more convenient, not have influence on the normal transmission of the signal of other network that does not have the breakpoint place.
And the light signal to the detection breakpoint of the optical module emission of OLT in the optical module of ONU (being called for short the ONU optical module) reflects, and is convenient to determine the position of ONU in optical-fiber network, take the position of ONU as basis, the breaking point detection of being more convenient for.
In the passive compatible optical-fiber network that the embodiment of the invention provides, the OLT of integrated OTDR function and can reflect transmission for detection of the light signal between the optical module of the ONU of the light signal of breakpoint is shown in Fig. 3 a.
The optical module of OLT is launched the light signal of the first wavelength and the 4th wavelength as downlink optical signal; The light signal of the first wavelength and the 4th wavelength transmits in optical fiber, and behind the arrival ONU, the optical module of ONU is for the downlink optical signal of the first wavelength that receives the OLT transmission/the 4th wavelength (i.e. the first wavelength or the 4th wavelength);
The optical module of ONU sends the light signal of second wave length/the 5th wavelength (being second wave length or the 5th wavelength) to OLT, as uplink optical signal; The light signal of second wave length/the 5th wavelength transmits in optical fiber, and behind the arrival OLT, the light signal of the second wave length that the optical module of OLT sends for reception ONU/the 5th wavelength is as uplink optical signal.
The downlink optical signal and second of first, fourth above-mentioned wavelength, the uplink optical signal of five wavelength are to be used for the Communication ray signal that the information of carrying out transmits between OLT and the ONU.
The optical module of OLT is also launched the light signal for detection of the three-wavelength of breakpoint;
The light signal of three-wavelength transmits in optical fiber, if having breakaway poing or equipment fault place in the optical fiber, then is reflected at breakaway poing or equipment fault place; In addition, the light signal of the three-wavelength in the optical fiber also can be by the optical module reflection of ONU.
After the optical module of OLT receives the light signal of the three-wavelength that reflects, the light signal of three-wavelength to reflection is sampled, is analyzed, after the optical module of determining breakpoints of optical fiber position: OLT receives the light signal of three-wavelength of reflection, the light signal of three-wavelength to reflection is sampled, is analyzed, according to the duration of reflection peak apart from the launch time of the light signal of three-wavelength, therefrom determine the reflection peak of the optical module reflection that is not ONU, as the breakpoint reflection peak, and then distance and the position of judgement breakpoint.
Describe the technical scheme of the embodiment of the invention in detail below in conjunction with accompanying drawing.The optical line terminal optical module internal structure circuit block diagram of the embodiment of the invention, shown in Fig. 3 b, comprising: the first generating laser 301, the first laser detector 302, the second generating laser 303, the second laser detector 304, breaking point detection module 305, optical path component 306, the 3rd generating laser 307, the 3rd laser detector 308.
The first generating laser 301 is arranged on the signal of telecommunication that the switch of central office of the access net system of optical fiber telecommunications system transmits in order to reception, after the electric light conversion, the light signal that the signal of telecommunication that receives is converted to the first wavelength is launched.The light signal of the first generating laser 301 emissions enters into optical fiber and propagates after optical path component 306 couplings.Particularly, the SerDes(serializer/deserializer in the first generating laser 301 desamplers, or claim switch) signal of telecommunication that sends, the light signal that the signal of telecommunication that receives is converted to the first wavelength is launched.
The 3rd generating laser 307 is arranged on the signal of telecommunication that the switch of central office of the access net system of optical fiber telecommunications system transmits in order to reception, after the electric light conversion, the light signal that the signal of telecommunication that receives is converted to the 4th wavelength is launched.The light signal of the 3rd generating laser 307 emissions enters into optical fiber and propagates after optical path component 306 couplings.
The second wave length light signal of coming from Optical Fiber Transmission is behind minute light action of optical path component 306, and the light signal of second wave length is sent to the first laser detector 302.The first laser detector 302 after opto-electronic conversion, is converted to the light signal of the second wave length that receives the signal of telecommunication and sends to switch, the SerDes(switch of switch) carry out data analysis.
The 5th wavelength light signal of coming from Optical Fiber Transmission is behind minute light action of optical path component 306, and the light signal of the 5th wavelength is sent to the 3rd laser detector 308.The light signal of the 5th wavelength that the 3rd laser detector 308 will receive after opto-electronic conversion, is converted to the signal of telecommunication and sends to switch.
Switch is by the first generating laser 301 and the first laser detector 302, and the 3rd generating laser 307 and the 3rd laser detector 308 have been realized the communication function of signal send and receive.That is to say, the first generating laser 301 and the 3rd generating laser 307 desamplers send is used for the signal of telecommunication of communicate by letter, is converted into for the light signal of communicating by letter; The first laser detector 302 receives for the light signal of communicating by letter with the 3rd laser detector 308, and the signal of telecommunication that is converted into for communication sends to switch.
The second generating laser 303 is used for the light signal of emission three-wavelength, and the light signal of this three-wavelength is the light signal for detection of breakpoint.The light signal of the three-wavelength of the second laser detector 304 emissions enters into optical fiber and propagates after optical path component 306 couplings.The light signal of three-wavelength transmits in optical fiber, be reflected at the breakaway poing of optical fiber or fault place or other place of equipment, the light signal of the three-wavelength that is reflected transmits in optical fiber, after turning back to optical path component 306, through minute light action of optical path component 306, the light signal of the three-wavelength that is reflected back toward is sent to the second laser detector 304.Particularly, the signal of telecommunication that is used for carrying out breaking point detection that the second generating laser 303 desamplers send, and the signal of telecommunication that receives is converted to the light signal of three-wavelength: the MAC(MediaAccess Control in the switch, medium access controller) when carrying out breaking point detection, send the signal of telecommunication that is used for carrying out breaking point detection to the second generating laser 303, the second generating laser 303 is launched the light signal that the signal of telecommunication that receives is converted to three-wavelength.
After the second laser detector 304 is received the light signal of the three-wavelength that reflects, through output electrical signals after the opto-electronic conversion.
The signal of telecommunication of 305 pairs of the second laser detectors of breaking point detection module, 304 outputs is sampled, is analyzed: the signal of telecommunication of sampling and the signal of telecommunication under normal circumstances of pre-save compared, thus the position of definite breakpoint or fault point.
Above-mentioned passive compatible optical-fiber network specifically can be the EPON of compatible gigabit and ten gigabits; Wherein, the light signal of the first wavelength specifically can be the light signal of 1490nm, and the light signal of second wave length specifically can be the light signal of 1310nm, and the light signal of three-wavelength specifically can be the light signal of 1625nm; The light signal of the 4th wavelength is the light signal of 1577nm, and the light signal of the 5th wavelength is the light signal of 1270nm.
The first generating laser 301 of optical line terminal optical module or the inside physical circuit in the 3rd generating laser 307 are as shown in Figure 4; Wherein, the first generating laser 301 can comprise: launch the DFB(Distribute FeedBack Laser of the light signal of the first wavelength, the distributed feedback laser) transmitting illuminant and drive circuit thereof.The 3rd generating laser 307 can comprise: DFB transmitting illuminant and the drive circuit thereof of launching the light signal of the 4th wavelength.
The first laser detector 302 of optical line terminal optical module or the inside physical circuit in the 3rd laser detector 308 are as shown in Figure 5; Wherein, the first laser detector 302 can comprise: receive the APD(Avalanche Photo Diode of the light signal of second wave length, avalanche photodide) pick-up probe and amplitude limiting amplifier circuit.The 3rd laser detector 308 can comprise: the APD pick-up probe and the amplitude limiting amplifier circuit that receive the light signal of the 5th wavelength.
The second generating laser 303 of optical line terminal optical module specifically can comprise: OTDR DFB burst transmissions light source and the drive circuit thereof of launching the light signal of three-wavelength; Specifically can be the OTDR DFB of 1625nm, the drive circuit of the OTDR DFB burst transmissions light source of this 1625nm drives this OTDR DFB burst transmissions light source and launches the light signal that three-wavelength is 1625nm.Particularly, the signal of telecommunication that is used for carrying out breaking point detection that the MAC of the drive circuit desampler of the OTDR DFB burst transmissions light source of 1625nm sends drives this OTDR DFB burst transmissions light source according to the signal of telecommunication that receives and launches the light signal that three-wavelength is 1625nm.When carrying out breaking point detection, MAC enables 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 sends the signal of telecommunication that is used for carrying out breaking point detection to this drive circuit by the Data_OTDR holding wire; This drive circuit drives OTDR DFB burst transmissions light source according to the signal of telecommunication that receives and launches the light signal that three-wavelength is 1625nm.
The OTDR DFB burst transmissions light source of 1625nm and the circuit diagram of drive circuit thereof owing to the OTDR DFB burst transmissions light source of 1625nm and the circuit that drive circuit is well known to those skilled in the art thereof, are introduced as shown in Figure 6 herein no longer in detail.
The second laser detector 304 of optical line terminal optical module is specially the OTDRAPD detector of the light signal that receives three-wavelength.Specifically can be the OTDRAPD of 1625nm, after the OTDRAPD detector of this 1625nm receives that the three-wavelength that reflects is the light signal of 1625nm, through output electrical signals after the opto-electronic conversion.
The breaking point detection module 305 of optical line terminal optical module specifically can comprise: gain circuitry and ADC(analog-to-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 shown in Figure 7 because the circuit that the OTDR APD detector circuit of 1625nm is well known to those skilled in the art is introduced no longer in detail herein.
The gain circuitry of breaking point detection module 305 amplifies the signal of telecommunication of the OTDR APD detector output of 1625nm, be input in the adc circuit, adc circuit is sampled to the signal of telecommunication, obtains digital signal, and the digital signal of sampling is stored in the logic array circuit.The digital signal that logic array circuit deposits adc circuit in and pre-stored at storage medium such as FLASH(flash memory) signal under normal circumstances in compares, by logical operation, determine the position of breakpoints of optical fiber or fault point, and by and the MCU control circuit between interface the position of breakpoint or fault point sent to the MCU control circuit preserve.The MAC of switch can obtain by access MCU control circuit the position of breakpoints of optical fiber or fault point.Logic array circuit specifically can be FPGA(Field Programmable GataArray, field programmable gate array), the PAL(programmable logic array) etc. circuit.Obviously, those skilled in the art also can adopt other device, realize that such as computing chips such as single-chip microcomputer, processor, micro controller signal compares, and determines the function of breakpoint or position of failure point.
The MCU control circuit is stored from the position that logic array circuit obtains breakpoint or fault point.The MCU control circuit specifically can be single-chip microcomputer, controller, processor of various models etc.
In addition, the MCU control circuit can also be communicated by letter with the MAC of switch, and the status signal of optical line terminal optical module is reported MAC, receives simultaneously the instruction that MAC sends, control the work of the first generating laser 301 according to instruction, perhaps the work of the second generating laser 303.
The operation principle of the optical line terminal optical module that the embodiment of the invention provides is as follows:
This optical line terminal optical module can receive the uplink optical signal of second wave length and the 5th wavelength at the downlink optical signal of emission the first wavelength and the 4th wavelength, when communicating, also can carry out breaking point detection by the light signal of launching three-wavelength:
The OTDR DFB burst transmissions light source of 1625nm sends a series of burst laser under the effect of its drive circuit; Laser is during through the breakpoint in the optical fiber link, because Rayleigh scattering and Fresnel reflection understand some return loss light and be reflected back optical fiber, and the laser of reflection and then turn back to the OTDR APD detector of 1625nm.The OTDR APD detector of 1625nm is received the light that reflects, and through photoelectric conversion, forms the signal of telecommunication, then through the sampling of gain circuitry amplification and adc circuit, obtains digital signal transfers to logic array circuit FPGA.FPGA compares the signal under normal circumstances of depositing among the signal that receives and the Flash, finds the position that breakpoint occurs, and FPGA passes to the MCU control circuit by the SPI interface with breakpoint location.The MAC of switch learns the position that breakpoint occurs by access MCU control circuit.
Fig. 8 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 the spliter, the long optical fiber of one section 10km is arranged, spliter is 1km to the distance between the ONU1, spliter is 2km to the distance between the ONU2, spilter is 10km to the distance between the ONU3, but at the 7km place fibercuts has occured.When we use the OTDR function of this optical module, the Distributed Feedback Laser Emission Lasers signal of 1625nm, OTDR APD detector is received signal as shown in Figure 9.Can find out from signal shown in Figure 9, at the optical line terminal optical module apart from the 10km place, because the reflection of spliter, detect a Fei Nier reflection peak, at the 11km place, detect the reflection peak of ONU1, at the 12km place, detect the reflection peak of ONU2, at the 17km place, detect the reflection peak that fibercuts causes.
The comparison system layout, the signal of normal condition should be: at the optical line terminal optical module apart from the 10km place, because the reflection of spliter, detect a reflection peak, at the 11km place, we detect the reflection peak of ONU1, at the 12km place, we detect the reflection peak of ONU2, at the 20km place, detect the reflection peak of ONU3.
Thus, can judge that spliter breakpoint occurred to the circuit between the ONU3, this breakpoint distance light road terminal optical module 17km.
Suppose after OTDR is luminous, receive the reflection peak (as shown in figure 10) of breakpoint at the T2 time point, the distance of distance light road, breakpoint place terminal optical module calculates according to following formula 1 so:
In the 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.
In actual applications, the present inventor's discovery, the light signal of the three-wavelength that is used for breaking point detection of the optical module emission of OLT may be absorbed fully by ONU sometimes, and can not reflect to OLT the light signal of three-wavelength; Like this, to cause the optical module of OLT owing to not receiving the light signal of the three-wavelength of ONU reflection, also just can't calculate the distance of ONU and spliter, also just can not be preferably according to the reflection peak of ONU, and the reflection peak of breakpoint is judged position and the distance of breakpoint.Therefore, the present invention also provides the optical module of the ONU of the light signal that can reflect three-wavelength; The concrete internal structure of the optical module of ONU of the present invention will be introduced follow-up.
The internal structure of the ONU optical module of the embodiment of the invention as shown in figure 11, comprising: generating laser 1401, laser detector 1402, optical path component 1403.
The signal of telecommunication that generating laser 1401 sends in order to receive the ONU system equipment, after the electric light conversion, the light signal that the signal of telecommunication that receives is converted to second wave length/the 5th wavelength is launched.The light signal of generating laser 1401 emissions enters into optical fiber and propagates after optical path component 1403 couplings.
The light signal of first wavelength of coming from Optical Fiber Transmission/the 4th wavelength is sent to laser detector 1402 through optical path component 1403.The light signal of the first wavelength that laser detector 1402 will receive/the 4th wavelength after opto-electronic conversion, is converted to the signal of telecommunication and sends to the ONU system equipment and process.
The internal structure of optical path component 1403, as shown in figure 12, comprising: 2 TO-CAN and 2 wavelength division multiplexing elements; 2 TO-CAN are respectively TO-CAN5, TO-CAN6; 2 wavelength division multiplexing elements are respectively the first wavelength-division multiplex element 1501, the second wavelength-division multiplex element 1502.The optical interface of optical path component 1403 links to each other with optical fiber by its optical interface as the optical interface of ONU optical module.
The first wavelength-division multiplex element 1501 is arranged at along on the optical axis direction of the optical interface of optical path component 1403, to the light signal transmission of the first wavelength/the 4th wavelength and second wave length/the 5th wavelength, to the light signal reflection of three-wavelength.The optical interface of ONU optical module is used for being connected with optical fiber, the light signal of the first wavelength that the first wavelength-division multiplex element 1501 can transmission be transmitted from optical fiber to the ONU optical module/the 4th wavelength, and the light signal of the second wave length from the ONU optical module to Optical Fiber Transmission/the 5th wavelength; Simultaneously the first wavelength-division multiplex element 1501 can also reflect the light signal of the three-wavelength of coming from Optical Fiber Transmission.
Be packaged with DFB transmitting illuminant and the 5th optical lens of generating laser 1401 among the TO-CAN5; The optical axis of the optical axis of the DFB transmitting illuminant that encapsulates among the TO-CAN5 and the optical interface of optical path component 1403 is positioned at same straight line;
Be packaged with APD pick-up probe and the 6th optical lens in the laser detector 1402 among the TO-CAN6; The optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the TO-CAN6 and the TO-CAN5 is vertical; The intersection point of the optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the TO-CAN6 and the TO-CAN5 is called the 4th intersection point;
The second wavelength-division multiplex element 1502 is arranged between the optical interface of TO-CAN5 and optical path component 1403, the center of the second wavelength-division multiplex element 1502 and the 4th intersection point coincide, and with the angle of the optical axis of the DFB transmitting illuminant that encapsulates among the TO-CAN5 be acute angle, preferably, this acute angle is 45° angle.The second wavelength-division multiplex element 1502 one facing to the DFB transmitting illuminant that encapsulates among the TO-CAN5, the APD pick-up probe that another side encapsulates in TO-CAN6 and the first wavelength-division multiplex element.
The second wavelength-division multiplex element 1502 is used for the light splitting of the first wavelength/the 4th wavelength and the light signal of second wave length/the 5th wavelength: the APD pick-up probe that the light signal of the second wave length that the DFB transmitting illuminant that the described TO-CAN5 of transmission encapsulates is launched/the 5th wavelength, the light signal that reflects the first wavelength/the 4th wavelength encapsulate in the described TO-CAN6.Particularly, the light signal by the second wave length of the DFB transmitting illuminant of generating laser 1401 emission/the 5th wavelength is sent to optical fiber through the transmission of the second wavelength-division multiplex element 1502, the transmission of the first wavelength-division multiplex element 1501; The optical signals optical fiber of the first wavelength/the 4th wavelength imports, arrives the second wavelength-division multiplex element 1502 into after the transmission of the first wavelength-division multiplex element 1501, the light signal of 1502 pairs of the first wavelength of the second wavelength-division multiplex element/the 4th wavelength reflects, the light signal of the first wavelength after the reflection/the 4th wavelength is detected reception along the APD pick-up probe that the optical axis of the APD pick-up probe that encapsulates among the TO-CAN6 enters into laser detector 1402, transfers the amplifier that is limited behind the signal of telecommunication to and amplifies output.The second wavelength-division multiplex element 1502 specifically can be to be coated with the first wavelength/the 4th wavelength and the second wave length/anti-reflection film of the 5th wavelength, the filter that increases anti-film of three-wavelength.
Further, also can comprise the 3rd wavelength division multiplexing element 1503 in the optical path component 1403.
The 3rd wavelength division multiplexing element 1503 is arranged between the 4th intersection point and the TO-CAN6, and vertical with the optical axis of the APD pick-up probe that encapsulates among the TO-CAN6, the light signal that is used for transmission the first wavelength/the 4th wavelength, to the light signal reflection of other wave band, enter into the stray light signal of laser detector 1402 to help minimizing.The 3rd wavelength division multiplexing element specifically can be the filter that is coated with the anti-reflection film of the first wavelength.
Preferably, as shown in figure 13, also can comprise in the optical path component 1403: isolator 1504.
Preferably, in order to improve the reflectivity to light time territory detection signal, reduce the volume of photoelectric device as far as possible, the first above-mentioned wavelength-division multiplex element 1501 can be close to the end face setting of optical interface, and setting angle is preferably complied with the inclination angle of optical interface end face self; Also the first wavelength-division multiplex element 1501 can be arranged in the middle of the ceramic insertion core of optical interface.
The first wavelength-division multiplex element 1501 specifically can be filter or the film that is coated with the reflectance coating of reflection three-wavelength light signal, can adopt also directly that the mode of plated film realizes (as shown in figure 13) on the ferrule endface of optical interface, namely the first wavelength-division multiplex element 1501 is the plated film on the ferrule endface of optical interface.
Preferably, described the first wavelength-division multiplex element to for detection of the reflectivity of the light signal of the three-wavelength of breakpoint more than or equal to 10%.
Preferably, optical path component 1403 is packaged in BOSA(Bidirectional Optical SubassemblyAssemble, single-fiber bidirectional photoelectric device) in; TO-CAN5 preferably is fixed on the left side of the metal shell of BOSA; Optical interface is fixed on the right side of the metal shell of BOSA, external optical fiber; TO-CAN6 is fixed on the upside of metal shell; Described second, third wavelength division multiplexing element is fixed on the inner carriage of metal shell.
The embodiment of the invention is owing to not only being provided with in the optical line terminal optical module be used to the generating laser that carries out optical signal communications and laser detector, and, also be provided with simultaneously the generating laser and the laser detector that can be used for breaking point detection, and can realize the transmitting-receiving of multipath light signal by optical path component, therefore, when the optical line terminal optical module carries out optical signal communications, also can carry out breaking point detection work.So, use the optical line terminal optical module of the embodiment of the invention carrying out needn't disconnecting optical fiber network system when breakpoints of optical fiber detects, and, when carrying out breaking point detection, can guarantee the normal transmission of the signal of the network that other does not have the breakpoint place.
And the light signal to the detection breakpoint of the optical module of OLT emission in the ONU optical module reflects, and is convenient to determine the position of ONU in optical-fiber network, take the position of ONU as basis, the breaking point detection of being more convenient for.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle 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 (10)
1. passive compatible optical-fiber network comprises: optical line terminal and optical network unit, it is characterized in that,
The optical module of described optical line terminal be used for the light signal of emission the first wavelength and the 4th wavelength as downlink optical signal, and the light signal of reception second wave length and the 5th wavelength is as uplink optical signal; And also launch light signal for detection of the three-wavelength of breakpoint, and and after receiving the light signal of the three-wavelength that reflects, the light signal of the three-wavelength of reflection is sampled, analyzed, determine the breakpoints of optical fiber position;
The optical module of described optical network unit is used for receiving the light signal of the first wavelength/the 4th wavelength, the light signal of emission second wave length/the 5th wavelength, and reflects the light signal of three-wavelength.
2. optical-fiber network as claimed in claim 1 is characterized in that, the optical module of described optical line terminal comprises:
Optical path component, it links to each other with optical fiber;
The first generating laser communicates with described optical path component light path, exports after being used for the signal of telecommunication of desampler input and being converted into the light signal of the first wavelength, enters described optical fiber after described optical path component coupling;
The first laser detector communicates with described optical path component light path, be used for to receive 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;
The second generating laser communicates with described optical path component light path, is used for the light signal of emission three-wavelength; The light signal of three-wavelength enters described optical fiber after described optical path component coupling;
The second laser detector communicates with described optical path component light path, be used for to receive the light signal of the three-wavelength of reflection, and exports after the light signal that receives 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;
The breaking point detection module is used for the signal of telecommunication of the second laser detector output is sampled, analyzed, and determines the breakpoints of optical fiber position;
The 3rd generating laser communicates with described optical path component light path, exports after being used for the signal of telecommunication of desampler input and being converted into the light signal of the 4th wavelength, enters described optical fiber after described optical path component coupling;
The 3rd laser detector communicates with described optical path component light path, be used for to receive the light signal of the 5th wavelength, outputs to described switch after being converted into the signal of telecommunication; Wherein, the light signal of the 5th wavelength is transferred to the 3rd laser detector from described optical fiber through described optical path component.
3. optical-fiber network as claimed in claim 1 is characterized in that, the optical module of described optical network unit comprises:
Optical path component links to each other with optical fiber by its optical interface, is used for the light signal of transmission the first wavelength/the 4th wavelength, second wave length/the 5th wavelength, reflects the light signal of three-wavelength;
Generating laser communicates with described optical path component light path, exports behind the light signal that is used for receiving the signal of telecommunication of optical network unit system equipment transmission and being converted into second wave length/the 5th wavelength, enters described optical fiber after described optical path component coupling;
Laser detector communicates with described optical path component light path, be used for to receive the light signal of the first wavelength/the 4th wavelength, outputs to described optical network unit system equipment after being converted into the signal of telecommunication.
4. optical-fiber network as claimed in claim 3 is characterized in that, described optical path component comprises:
The first wavelength-division multiplex element is arranged at along on the optical axis direction of the optical interface of described optical path component, to the light signal transmission of the first wavelength and second wave length, to the light signal reflection of three-wavelength;
Coaxial type laser diode module TO-CAN5 wherein is packaged with DFB transmitting illuminant and the 5th optical lens of described generating laser; The optical axis of the optical axis of the DFB transmitting illuminant that encapsulates among the described TO-CAN5 and the optical interface of described optical path component 1403 is positioned at same straight line;
Coaxial type laser diode module TO-CAN6 wherein is packaged with APD pick-up probe and the 6th optical lens in the described laser detector; The optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5 is vertical;
The second wavelength-division multiplex element is arranged between the optical interface of described TO-CAN5 and described optical path component, and its center and the 4th intersection point coincide, and with described TO-CAN5 in the angle of optical axis of the DFB transmitting illuminant that encapsulates be acute angle; Wherein, the 4th intersection point is the intersection point of the optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5; The second wavelength-division multiplex element is used for the light signal of the second wave length of the DFB transmitting illuminant emission that the described TO-CAN5 of transmission encapsulates, the APD pick-up probe that the light signal that reflects the first wavelength encapsulates in the described TO-CAN6.
5. optical-fiber network as claimed in claim 4 is characterized in that, described optical path component also comprises:
The 3rd wavelength division multiplexing element is arranged between the 4th intersection point and the described TO-CAN6, and vertical with the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6, is used for the light signal of transmission the first wavelength/the 4th wavelength, to the light signal reflection of other wave band.
6. such as the arbitrary described optical-fiber network of claim 1-5, it is characterized in that, described passive compatible optical-fiber network is specially the EPON of compatible gigabit and ten gigabits; Wherein, the light signal of the first wavelength is the light signal of 1490nm, and the light signal of second wave length is the light signal of 1310nm, and the light signal of three-wavelength is the light signal of 1625nm, the light signal of the 4th wavelength is the light signal of 1577nm, and the light signal of the 5th wavelength is the light signal of 1270nm.
7. an optical network unit optical module comprises: generating laser and laser detector; It is characterized in that, also comprise: optical path component; Described optical path component comprises:
The first wavelength-division multiplex element is arranged at along on the optical axis direction of the optical interface of described optical path component, to the light signal transmission of the first wavelength/the 4th wavelength and second wave length/the 5th wavelength, to the light signal reflection of three-wavelength;
Coaxial type laser diode module TO-CAN5 wherein is packaged with DFB transmitting illuminant and the 5th optical lens of described generating laser; The optical axis of the optical axis of the DFB transmitting illuminant that encapsulates among the described TO-CAN5 and the optical interface of described optical path component 1403 is positioned at same straight line;
Coaxial type laser diode module TO-CAN6 wherein is packaged with APD pick-up probe and the 6th optical lens in the described laser detector; The optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5 is vertical;
The second wavelength-division multiplex element is arranged between the optical interface of described TO-CAN5 and described optical path component, and its center and the 4th intersection point coincide, and with described TO-CAN5 in the angle of optical axis of the DFB transmitting illuminant that encapsulates be acute angle; Wherein, the 4th intersection point is the intersection point of the optical axis of the DFB transmitting illuminant that encapsulates among the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6 and the described TO-CAN5; The second wavelength-division multiplex element is used for the light signal of the second wave length of the DFB transmitting illuminant emission that the described TO-CAN5 of transmission encapsulates/the 5th wavelength, the APD pick-up probe that the light signal that reflects the first wavelength/the 4th wavelength encapsulates in the described TO-CAN6.
8. optical module as claimed in claim 7 is characterized in that, described optical path component also comprises:
The 3rd wavelength division multiplexing element is arranged between the 4th intersection point and the described TO-CAN6, and vertical with the optical axis of the APD pick-up probe that encapsulates among the described TO-CAN6, is used for the light signal of transmission the first wavelength/the 4th wavelength, to the light signal reflection of other wave band;
Isolator is arranged between the 4th intersection point and the described TO-CAN5, and vertical with the optical axis of the DFB transmitting illuminant that encapsulates among the described TO-CAN5, is used for the light signal of the second wave length of the described DFB transmitting illuminant emission of one direction transmission/the 5th wavelength.
9. optical module as claimed in claim 8 is characterized in that, the first wavelength-division multiplex element is filter or the film that is coated with reflectance coating, perhaps is the plated film on the ferrule endface of described optical interface; And
Described the first wavelength-division multiplex element to the reflectivity of the light signal of three-wavelength more than or equal to 10%; And
The second wavelength-division multiplex element is to be coated with the first wavelength/the 4th wavelength and the second wave length/anti-reflection film of the 5th wavelength, the filter that increases anti-film of three-wavelength; And
The 3rd wavelength division multiplexing element is the filter that is coated with the anti-reflection film of the first wavelength/the 4th wavelength.
10. such as the arbitrary described optical module of claim 6-9, it is characterized in that, described optical path component is packaged among the BOSA; And
Described TO-CAN5 is fixed on the left side of the metal shell of described BOSA; Described optical interface is fixed on the right side of the metal shell of described BOSA; Described TO-CAN6 is fixed on the upside of described metal shell; Second, third wavelength division multiplexing element is fixed on the inner carriage of described metal shell.
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| CN110768726A (en) * | 2018-07-27 | 2020-02-07 | 上海微电子装备（集团）股份有限公司 | Optical communication line concentrator |
| CN115291339A (en) * | 2021-05-03 | 2022-11-04 | 迈络思科技有限公司 | Optical communication module with improved security |
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| CN110768726A (en) * | 2018-07-27 | 2020-02-07 | 上海微电子装备（集团）股份有限公司 | Optical communication line concentrator |
| CN110768726B (en) * | 2018-07-27 | 2021-03-23 | 上海微电子装备（集团）股份有限公司 | Optical communication line concentrator |
| CN115291339A (en) * | 2021-05-03 | 2022-11-04 | 迈络思科技有限公司 | Optical communication module with improved security |
| WO2024021936A1 (en) * | 2022-07-28 | 2024-02-01 | 华为技术有限公司 | Optical communication apparatus and optical network device |
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