CN203747825U - ONU optical module with optical fiber fault detection function - Google Patents
ONU optical module with optical fiber fault detection function Download PDFInfo
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- CN203747825U CN203747825U CN201420099480.7U CN201420099480U CN203747825U CN 203747825 U CN203747825 U CN 203747825U CN 201420099480 U CN201420099480 U CN 201420099480U CN 203747825 U CN203747825 U CN 203747825U
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Abstract
The utility model discloses an ONU optical module with an optical fiber fault detection function. The ONU optical module with an optical fiber fault detection function includes a signal processing circuit, an optical coupling unit, a communication interface and an optical time domain reflection circuit; the optical time domain reflection circuit is used for receiving a fault test instruction sent by the signal processing circuit or a client system terminal, so as to generate a test pulse which is transmitted to the optical coupling unit; an optical pulse with a specific wavelength is further formed and is incident to the optical fiber; and the optical pulse fed back by the optical fiber is received, so that optical fiber fault detection is realized. According to the utility model, the OTDR is assembled in the ONU optical module of the PON system client end, so that the system client end can diagnose and localize the optical fiber fault. Each OUN optical module is used to detect whether the optical fiber connected with the ONU optical module has the breakpoint fault; and when the network topological structure of the system is expanded, only the ONU needing to be provided accesses the system, so that the smooth upgrading of the system client end optical fiber fault location function is realized.
Description
Technical field
The utility model belongs to technical field of optical fiber communication, specifically, relates to a kind of circuit structure design of the optical network unit ONU optical module that is applied in optical fiber telecommunications system client.
Background technology
In optical fiber telecommunications system, the transmission medium of light---optical fiber/optical cable is often laid on countryside or seabed, occurs unavoidably the problem such as link failure or transmission equipment fault.To break down or the position of breakpoint in order can accurately locating, conventionally to adopt at present optical time domain reflectometer OTDR(Optical Time Domain Reflectometer) carry out detection, the location of fiber failure.
Optical time domain reflectometer OTDR adopts time domain measurement method, and the light pulse that first transmitting has certain wavelength, in optical fiber, then receives at OTDR port the information of returning and analyzes.In the time that light pulse is transmitted in optical fiber, can be because character, connector, junction point, bending or other similar event of optical fiber itself produce scattering and reflection, wherein a part of scattering and reverberation will turn back in OTDR, the useful information returning is measured by the detector of OTDR, as the time on diverse location in optical fiber or curve segment.Utilize and receive inverse signal time used and the transmission speed of light signal optical fiber from transmitting signals to, just can calculate the position that causes light signal generation scattering and reflection, and then realize the accurate location of abort situation.
Optical time domain reflectometer OTDR characterizes the characteristic of optical fiber with Rayleigh scattering and Fresnel reflection.Rayleigh scattering is the inhomogeneities due to optical fiber, and light signal produces irregular scattering along optical fiber and forms.OTDR measurement turns back to a part of scattered light of OTDR port, and these backscatter signals have just shown decay (loss/distance) degree being caused by optical fiber.Fresnel reflection is discrete reflection, and it causes by the indivedual points in whole piece optical fiber, and these are made up of the factor that causes reverse parameter to change, the gap of for example fibre core and air.On these aspects, have very strong back-scattering light and be reflected back.Therefore, OTDR utilizes the information of Fresnel reflection be located by connecting point, fibre-optic terminus or breakpoint.
In current passive optical network is disposed, optical time domain reflectometer OTDR is laid in system local side mostly, or is built in the optical line terminal OLT of system local side, or mutually external with described OLT.No matter adopt which kind of design, when system local side increases optical time domain reflectometer OTDR, all need to set up again a Multichannel photoswitch, connect described OTDR, and under each PON mouth of local side, also need to increase respectively again an optical multiplexer, connect described Multichannel photoswitch.Utilize described Multichannel photoswitch and optical multiplexer that the downlink business light data of the light pulse of OTDR transmitting and OLT transmitting are combined, transfer to Optical Distribution Network ODN.
Along with passive optical network is disposed the expanding day of scale, introduce fiber failure measuring ability at system local side, not only can cause the network topology structure of whole system to become complex, and for Virtual network operator, also can cause the significantly lifting of its maintenance management cost, and also can propose higher requirement to operating personnel's level professional technology.
Summary of the invention
The purpose of this utility model is to provide a kind of ONU optical module with fiber failure measuring ability, by OTDR test module is arranged in optical network unit ONU optical module, thereby in realizing system fiber failure measuring ability, simplify the system configuration of EPON, realized the smooth upgrade of FTP client FTP to fiber failure detection and location function.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:
An ONU optical module with fiber failure measuring ability, comprises
Signal processing circuit, for transmitting conventional upstream data and downlink data;
Optical coupling unit, for the bi-directional conversion between light signal and the signal of telecommunication, and is connected with coupling fiber;
Communication interface, for external client terminal, transmission data and instruction;
Optical time domain reflection circuit, for receiving the fault test instruction of sending by signal processing circuit or client terminal, be sent to optical coupling unit to generate test pulse, and then the light pulse of formation specific wavelength, inject optical fiber and receive the light pulse of feeding back by optical fiber, carrying out the detection of fiber failure.
Further, in described optical time domain reflection circuit, be provided with OTDR test circuit and OTDR data processing circuit; Described OTDR data processing circuit generates the test pulse sequence signal of telecommunication, is sent to OTDR test circuit; Described OTDR test circuit is receiving after described fault test instruction, generates test pulse be sent to described optical coupling unit according to the test pulse sequence signal of telecommunication.
Preferably, in described OTDR test circuit, be provided with microprocessor, optical receiver and optical sender; Described microprocessor is receiving after described fault test instruction, controls optical sender and starts operation, and the test pulse sequence signal of telecommunication is sent to optical sender, generates test pulse by optical sender, is sent to described optical coupling unit; Described optical coupling unit converts the light pulse of feeding back by optical fiber to the signal of telecommunication, is sent to optical receiver and amplifies after processing, exports OTDR data processing circuit to.
Further, in described optical sender, be provided with level shifting circuit and pulse generating circuit; Described level shifting circuit connects microprocessor, receive the test pulse sequence signal of telecommunication of microprocessor output, after the conversion process of line level form of going forward side by side, export pulse generating circuit to, generate described test pulse by pulse generating circuit and be sent to optical coupling unit.
Further, in described optical receiver, be provided with trans-impedance amplifier, low-noise simulation differential amplifier and booster circuit; Described booster circuit connects microprocessor, and output high direct voltage is to described optical coupling unit; Described optical coupling unit converts the light pulse of feeding back by optical fiber after the signal of telecommunication to, is sent to trans-impedance amplifier and converts differential signal to, and described differential signal amplifies after processing via low-noise simulation differential amplifier, exports OTDR data processing circuit to.
Preferably, in described OTDR data processing circuit, be provided with digital to analog converter and fpga chip; Described digital to analog converter receives the signal of telecommunication of optical receiver feedback, and converts digital signal to and export fpga chip to, after fpga chip is processed, is sent to outside client terminal by described communication interface.
Carry out signal processing circuit and the optical time domain reflection circuit of transfer of data for adopting different bus agreement, in described ONU optical module, bus management module can also be further set, connect respectively described signal processing circuit and optical time domain reflection circuit, Dui Ge road bus is carried out switching controls.
Preferably, described bus management module is passed through I
2c bus connects respectively described signal processing circuit and OTDR test circuit, connects described OTDR data processing circuit, and pass through I by spi bus
2c is connected described communication interface with SPI multiplex bus.
In order to reduce system power dissipation, in described ONU optical module, be also provided with power management module, connect described bus management module, receive described fault test instruction by bus management module, optical time domain reflection circuit is carried out to power supply control.Only in the time that needs carry out fiber failure test, start operation by controlling optical time domain reflection circuit, thereby avoided energy waste, saved electric energy.
Further, in described optical coupling unit, be provided with laser for communication for launching uplink optical signal, for receiving the detector for communication of downlink optical signal, for launching the test laser of described light pulse and for receiving the test detector of feedback light pulse; Described laser for communication, detector for communication, test separately by after the encapsulation of an encapsulation body, are laid in the side of round and square tube body in optical module with laser and test detector.
Compared with prior art, advantage of the present utility model and good effect are: the utility model passes through optical time domain reflection circuit OTDR Integrated design in the ONU of passive optical network client optical module, thereby has realized the diagnosis of system client to fiber failure and the positioning function of fault point.Adopt this design, can simplify on the one hand the design of network topology structure of system local side, in the time realizing the fiber failure measuring ability of system, without again the optical line terminal OLT of local side being carried out to structure of modification, facilitated the structural design of system local side, on the other hand, by integrated OTDR test function in the ONU of client optical module, utilize each OUN optical module to detect connected optical fiber and whether have breakpoint fault, thus in the time system being carried out to network topology structure expansion, the ONU optical module connecting system that only needs need be increased, simple to operate, realize easily, possesses higher level professional technology without operating personnel, be conducive to realize the smooth upgrade of system client fiber failure positioning function, greatly reducing in optical-fiber network operator administers and maintains cost, can support well the expansion of later stage passive optical network service.
Read by reference to the accompanying drawings after the detailed description of the utility model execution mode, other features of the present utility model and advantage will become clearer.
Brief description of the drawings
Fig. 1 is the overall architecture schematic diagram of a kind of embodiment of the ONU optical module with fiber failure measuring ability that proposes of the utility model;
Fig. 2 is the physical circuit theory diagram of a kind of embodiment of the optical module of ONU shown in Fig. 1;
Fig. 3 is the contour structures schematic diagram of a kind of embodiment of optical coupling unit in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
PON is the abbreviation of Passive Optical Network, i.e. EPON.PON technology is a kind of typical point-to-multipoint access technology, is made up of the optical line terminal OLT of local side, optical network unit ONU and the Optical Distribution Network ODN of user side.In a PON system, generally only comprise an optical line terminal OLT, be installed in console for centralized control, i.e. local side, transmitting downlink optical signal, is divided into after multipath light signal by ODN, transfers to respectively in optical network unit ONU s at different levels by optical fiber.Described optical network unit ONU is installed on customer site, i.e. client, and a customer site need to be installed an ONU, receives the downlink optical signal that OLT sends, and to OLT passback uplink optical signal.
That OLT or ONU need to realize the mutual conversion between the signal of telecommunication and light signal with optical module, the utility model is by Integrated Light Time Domain Reflectometry circuit OTDR in existing ONU optical module, realize the single fiber bi-directional transmission of uplink optical signal, downlink optical signal and light time territory detection signal, guaranteeing under the prerequisite of light signal proper communication, by allowing ONU optical module replace OLT optical module to carry out fiber failure test assignment, realize equally online detection, monitoring and the localization of fault function of PON system.And, adopt ONU optical module to replace OLT optical module to carry out fiber failure test assignment, the system of also helping is carried out network topology structure expansion, facilitates the large scale deployment of PON system.
To be applied in ONU optical module in GPON system as example, by a specific embodiment, physical circuit assembling structure and the operation principle thereof of the ONU optical module with fiber failure measuring ability that the utility model is proposed are at length set forth below.
Embodiment mono-, shown in Figure 1, the present embodiment is the chief component such as built-in signal treatment circuit 100, optical coupling unit 200, communication interface 700 and optical time domain reflection circuit 800 in ONU optical module.Wherein, signal processing circuit 100 is the existing circuit in conventional optical module, be mainly used in conventional upstream data and downlink data transmit and process, to complete the basic communication of data business between client and local side in GPON system, and Real-time Collection reports the photoelectric properties index of ONU optical module.Described signal processing circuit 100 connects optical coupling unit 200, the upstream data that need to be uploaded on the one hand local side is sent to optical coupling unit 200, utilize laser integrated in optical coupling unit 200 to convert the upstream data of electrical signal form to light signal (uplink optical signal), optical fiber is injected in coupling, monomode fiber SMF as shown in Figure 1 of example, is sent to the OLT of local side by optical fiber SMF; On the other hand, the light signal (downlink optical signal) issuing by local side transfers to the ONU optical module of client by optical fiber SMF, convert downlink optical signal to the signal of telecommunication via detector integrated in optical coupling unit 200, it is downlink data, be sent to described signal processing circuit 100, carry out, after data processing, transferring to client terminal 900 via signal processing circuit 100.Described client terminal 900, for user provides Man Machine Interface, is connected communication by communication interface 700 with described ONU optical module.Described communication interface 700, for transmit ascending data, downlink data, control command and OTDR test data, comprises business data transmission interface and bus interface etc.
In order to make ONU optical module possess fiber failure measuring ability, the present embodiment is built in light Time Domain Reflectometry circuit 800 in described ONU optical module, realizes diagnosis to fiber failure and the positioning function of fault point based on OTDR technology.Optical time domain reflection circuit 800 is connected to described signal processing circuit 100 by bus management module 500, and connect client terminal 900 by communication interface 700, receive the fault test instruction of sending by signal processing circuit 100 or client terminal 900, be sent to optical coupling unit 200 to generate test pulse, and then the light pulse of formation specific wavelength, form wavelength and be independent of the test light pulse signal (light pulse signal that for example wavelength is 1625nm) outside GPON business light signal range of wavelengths used, be injected in optical fiber SMF.In the process that described light pulse is transmitted in optical fiber SMF, in the time running into connector, junction point, breakpoints of optical fiber or other similar event, will produce scattering and reflection, wherein a part of scattering and reverberation turn back to described ONU optical module by optical fiber SMF, receive and convert to after corresponding pulse signal via optical coupling unit 200, be sent to optical time domain reflection circuit 800, calculate light pulse by optical time domain reflection circuit 800 position of scattering and reflection occurs in optical fiber SMF, and then be sent to client terminal 900 by bus management module 500.The positional information that described client terminal 900 is searched each connector in GPON system according to the test position receiving, such as positional information of optical splitter and OLT optical module etc., whether automatically investigate this test position according to the positional information of each connector is breakpoint location, and then generation test result, offer attendant's monitoring, complete the Detection task of fiber failure.
In the present embodiment, described bus management module 500 is special propositions of the inconsistent situation of mode bus that use for signal processing circuit 100 and optical time domain reflection circuit 800, for example, when signal processing circuit 100 is used I
2when C bus, optical time domain reflection circuit 800 use spi bus transfer bus data, described bus management module 500 can be passed through respectively to I
2c bus is connected to signal processing circuit 100, is connected to optical time domain reflection circuit 800 by spi bus, and passes through I
2c and SPI multiplex bus are connected to communication interface 700, specifically can be connected to its inner bus interface, adopt I
2c bus transfer or spi bus transmission means are communicated by letter with outside client terminal 900, and the relevant informations such as transmission fault test instruction and test data complete the testing process of fiber failure.
In the optical time domain reflection circuit 800 of the present embodiment, OTDR test circuit 300 and OTDR data processing circuit 400 can be specifically set, shown in Figure 1.Wherein, OTDR data processing circuit connects bus management module 500 by spi bus, in the time of the fault test instruction that receive signal processing circuit 100 or client terminal 900 are sent, generates the test pulse sequence signal of telecommunication, is sent to OTDR test circuit 400.Described OTDR test circuit 400 is receiving after described fault test instruction, generates test pulse and is sent to optical coupling unit 200, generates the light pulse for OTDR test.
For the detection of fiber failure, can only in the time that starting, ONU optical module carry out, or feeling that carrying out appears when abnormal in system, also or in conventional system maintenance process carry out, because this process fault detection does not need to carry out in real time, therefore without carrying out fiber failure while detecting, can adopt the mode of closing optical time domain reflection circuit 800 to avoid energy unnecessary waste, reach and reduce the purpose of design of system power dissipation.Consider for this design, the present embodiment preferably arranges a power management module 600 in described ONU optical module, as shown in Figure 1, connect respectively described signal processing circuit 100, optically coupled circuit 200, bus management circuit 500 and optical time domain reflection circuit 800, the power supply of each functional circuit in module is carried out to allocation manager, make optical time domain reflection circuit 800 and signal processing circuit 100 separately work alone or work simultaneously.
A kind of physical circuit teaming method of the OUN optical module that Fig. 2 proposes for the present embodiment.Wherein, in described signal processing circuit 100, be specifically provided with the chief components such as processor (such as single-chip microprocessor MCU-1) 140, booster circuit 120, current mirror circuit 130,2.5G continuous mode digital received circuit and 1.25G burst mode digital laser drive circuit 110.First the upstream data sending by client terminal 900 transfers to MCU-1 by the business data transmission interface in communication interface, after MCU-1 processes, control 1.25G burst mode digital laser drive circuit the laser in optical coupling unit 200 is driven to control, and then converting upstream data to uplink optical signal, optical fiber SMF is injected in coupling.
Optical coupling unit 200 is optical link modules of optical interface in optical module, and its effect is that guiding up-downgoing light signal and OTDR light pulse are transmitted along optical link separately without interfering with each other.Integrated being provided with for upstream data being converted to the laser 220 for communication that wavelength is the utilizing emitted light signal of 1310nm in the optical coupling unit 200 of the present embodiment, for being the communication APD detector 210 that the receiving optical signals of 1490nm converts downlink data to by receiving wavelength, convert for the test pulse that optical time domain reflection circuit 800 is sent the laser 240 for test that wavelength is the light pulse of 1625nm to, for converting the 1625nm light pulse of returning by optical fiber SMF to the test APD detector 230 of test pulse and the optical coupling allocation units 250 that Dui Ge road light signal carries out transmission link distribution, as shown in Figure 2.
Fig. 3 is the shape assumption diagram of described optical coupling unit 200, is mainly formed by connecting by two round and square tube bodies 260,270.On four sides of round and square tube body 260,270 outsides, correspondence is provided with four encapsulation body TO(Transistor-Outline, column type encapsulation body), be respectively used to encapsulation described laser 220, communication detector 210, test laser 240 and test detector 230 for communication.Optical coupling allocation units 250 are built in round and square tube body 260,270, four TO light paths are coupled to fiber adapter with coaxial manner, by upstream and downstream light signal and test use transmit and receive light pulse according to the transmission requirement of optical link separately, guide on each self-corresponding optical interface and optical device.
After the downlink optical signal of the 1490nm issuing by OLT receives with detector 210 via communication, convert the signal of telecommunication to, transfer to 2.5G continuous mode digital received circuit, and then generate downlink data be sent to outside client terminal by the business data transmission interface in communication interface, complete conventional digital communication service.
For required high direct voltage in detector 210 courses of work for communication, provided by booster circuit 120 outputs.The response current that current mirror circuit 130 produces with detector 210 communication carries out, after mirror image collection and convergent-divergent processing, exporting MCU-1 to, completes the measuring ability of received optical power.
In the OTDR of the present embodiment data processing circuit 400, be mainly provided with on-site programmable gate array FPGA chip 410 and analog to digital converter 420.Described fpga chip 410 connects bus management module 500 and communication interface by spi bus, and connects OTDR test circuit 300 by analog to digital converter 420.In described OTDR test circuit 300, be mainly provided with microprocessor (for example single-chip microprocessor MCU-2) 350, optical receiver and optical sender, described MCU-2 passes through I
2c bus connects bus management module 500, and the test pulse sequence signal of telecommunication that receives fault test instruction and export by fpga chip 410 is controlled optical receiver and optical sender and completed OTDR test.
The ONU optical module of the present embodiment adopts initiatively test and two kinds of modes of external control to implement OTDR test function, judges whether client OUN exists fault to local side OLT optical fiber.
In the time adopting active test mode, after ONU optical module powers on, first carry out OTDR test, export fault test instruction via I by MCU-1
2c bus transfer is to bus management module 500, and bus management module 500 is connected the I between MCU-1 and MCU-2 on the one hand
2c bus links, is sent to described MCU-2 by described fault test instruction; Control on the other hand power management module 600 and utilize the power supply of each functional circuit except MCU-1 in its inner power management chip 610 shutoff signal treatment circuits 100 that arrange, and be the each functional circuit power supply in optical time domain reflection circuit 800, start optical time domain reflection circuit 800 and move, complete the Detection task to fiber failure.If the fault of existence, can report by multiplex bus; If there is no fault, can open the normal data communication business of ONU.
In the time adopting external control mode, client terminal 900 can generate at any time fault test instruction in the process of ONU optical module operation, is sent to ONU optical module by communication interface 700, starts OTDR test function.In the present embodiment, client terminal 900 can issue enable signal SEN(LVTTL level by spi bus, can select high level to enable or low level enables), transfer to bus management module 500, the emulation bus switch 510 in control bus administration module 500 is by the I between MCU-1 and MCU-2
2c bus links disconnects, I
2c communication interface is closed by hardware, to prevent and the SPI communication interface timing conflict of fpga chip 410.Meanwhile, control power management module 600 and power for OTDR test circuit 300 and OTDR data processing circuit 400, start optical time domain reflection circuit 800 and move.In addition, described enable signal SEN transfers to fpga chip 410 simultaneously, controls the software interface of fpga chip 410 by I at a slow speed
2c interface switches to SPI interface fast, to meet the communicating requirement between fpga chip 410 and client terminal 900.
No matter adopt initiatively test mode or external control mode, when optical time domain reflection circuit 800 starts after operation, OTDR test circuit 300 and OTDR data processing circuit 400 start to carry out initialization procedure, after initialization completes, can start to carry out OTDR test according to the sequential setting.
In execution OTDR test process, first produce the test pulse sequence signal of telecommunication by fpga chip 410, the width of pulse and the length of sequence can require (as tested optical fiber length, accuracy of detection, blind area size etc.) to be arranged by client terminal 900 according to concrete OTDR test condition, and the shortest single pulse width can be supported 50ns.Meanwhile, MCU-2 produces burst and enables control signal, controls optical sender and works in burst mode, only in the time of the pulse of needs transmission test, opens, and all the other times close, to reduce the reflection to Optical Receiver Noise.
In described optical sender, be provided with level shifting circuit 360 and pulse generating circuit 330, as shown in Figure 2.MCU-2 receives by bus management module 500 the test pulse sequence signal of telecommunication that fpga chip 410 sends, transfer to level shifting circuit 360, convert signal format LVTTL to LVPECL, input to pulse generating circuit 330, generate the required test pulse of test by pulse generating circuit 330 and be sent to optical coupling unit 200, use laser 240 to convert light pulse to by test, be coupled into and be incident upon optical fiber SMF.
In the process that described light pulse is transmitted in optical fiber SMF, in the time running into breakpoint, can there is reflection and scattering at breakpoint location, the reflection light pulse and the backscattering light pulse meeting that form are thus back to optical coupling unit 200 along the contrary direction of incident light, and after proportionally being distributed by optical coupling allocation units 250, be sent to test detector 230 and receive, and then convert corresponding current signal via test to detector 230, be sent to the optical receiver in OTDR test circuit 300.
In described optical receiver, be provided with booster circuit 320, trans-impedance amplifier 310 and low-noise simulation differential amplifier 340, as shown in Figure 2.Described booster circuit 320 connects MCU-2, receives the pwm signal of MCU-2 output, controls booster circuit 320 and generates the test detectors 230 required high direct voltage of working.Trans-impedance amplifier 310 receives the current signal of using detector 230 to send by test, converts differential signal to and exports low-noise simulation differential amplifier 340 to.Described low-noise simulation differential amplifier 340 is operated in negative feedback pattern, and output is amplified differential signal after treatment to the analog to digital converter 420 in OTDR data processing circuit 400.Described analog to digital converter 420 carries out analog-to-digital conversion to the analog signal receiving, and parallel output digital data transmission is to the corresponding IO mouth of fpga chip 410.Described analog to digital converter 420 and fpga chip 410 share outside 100MHz reference clock, fpga chip 410 is determined the position of light pulse generation reflection and scattering according to the digital signal receiving, and be sent to outside client terminal 900 by spi bus, finally generate OTDR test result, complete the diagnostic task of fiber failure.
If without carrying out OTDR test, MCU-1 or client terminal 900 can be by bus management module 500 output orders to MCU-2, and its control booster circuit 320 and pulse generating circuit 330 are not worked; Simultaneously, control the operating voltage of trans-impedance amplifier 310, low-noise simulation differential amplifier 340, analog to digital converter 420 and fpga chip 410 turn-offs by power management module 600, make in optical time domain reflection circuit 800 other functional modules except MCU-2 all in off position, to reduce power consumption.MCU-2 is arranged to holding state, once need work, can wakes up in time by bus management module 500.
ONU optical module function admirable of the present utility model, working stability is reliable, and OTDR measuring accuracy is high, substantially without impact, high with GPON business compatibility on GPON operation system photoelectric properties index, can be good at supporting the expansion of later stage GPON business.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also should belong to protection range of the present utility model.
Claims (10)
1. an ONU optical module with fiber failure measuring ability, comprises
Signal processing circuit, for transmitting conventional upstream data and downlink data;
Optical coupling unit, for the bi-directional conversion between light signal and the signal of telecommunication, and is connected with coupling fiber;
Communication interface, for external client terminal, transmission data and instruction;
It is characterized in that, be also provided with
Optical time domain reflection circuit, for receiving the fault test instruction of sending by signal processing circuit or client terminal, be sent to optical coupling unit to generate test pulse, and then the light pulse of formation specific wavelength, inject optical fiber and receive the light pulse of feeding back by optical fiber, carrying out the detection of fiber failure.
2. the ONU optical module with fiber failure measuring ability according to claim 1, is characterized in that: in described optical time domain reflection circuit, be provided with OTDR test circuit and OTDR data processing circuit; Described OTDR data processing circuit generates the test pulse sequence signal of telecommunication, is sent to OTDR test circuit; Described OTDR test circuit is receiving after described fault test instruction, generates test pulse be sent to described optical coupling unit according to the test pulse sequence signal of telecommunication.
3. the ONU optical module with fiber failure measuring ability according to claim 2, is characterized in that: in described OTDR test circuit, be provided with microprocessor, optical receiver and optical sender; Described microprocessor is receiving after described fault test instruction, controls optical sender and starts operation, and the test pulse sequence signal of telecommunication is sent to optical sender, generates test pulse by optical sender, is sent to described optical coupling unit; Described optical coupling unit converts the light pulse of feeding back by optical fiber to the signal of telecommunication, is sent to optical receiver and amplifies after processing, exports OTDR data processing circuit to.
4. the ONU optical module with fiber failure measuring ability according to claim 3, is characterized in that: in described optical sender, be provided with level shifting circuit and pulse generating circuit; Described level shifting circuit connects microprocessor, receive the test pulse sequence signal of telecommunication of microprocessor output, after the conversion process of line level form of going forward side by side, export pulse generating circuit to, generate described test pulse by pulse generating circuit and be sent to optical coupling unit.
5. the ONU optical module with fiber failure measuring ability according to claim 3, is characterized in that: in described optical receiver, be provided with trans-impedance amplifier, low-noise simulation differential amplifier and booster circuit; Described booster circuit connects microprocessor, and output high direct voltage is to described optical coupling unit; Described optical coupling unit converts the light pulse of feeding back by optical fiber after the signal of telecommunication to, is sent to trans-impedance amplifier and converts differential signal to, and described differential signal amplifies after processing via low-noise simulation differential amplifier, exports OTDR data processing circuit to.
6. the ONU optical module with fiber failure measuring ability according to claim 3, is characterized in that: in described OTDR data processing circuit, be provided with digital to analog converter and fpga chip; Described digital to analog converter receives the signal of telecommunication of optical receiver feedback, and converts digital signal to and export fpga chip to, after fpga chip is processed, is sent to outside client terminal by described communication interface.
7. according to the ONU optical module with fiber failure measuring ability described in any one in claim 2 to 6, it is characterized in that: in described ONU optical module, be also provided with bus management module, connect respectively described signal processing circuit and optical time domain reflection circuit, Dui Ge road bus is carried out switching controls.
8. the ONU optical module with fiber failure measuring ability according to claim 7, is characterized in that: described bus management module is passed through I
2c bus connects respectively described signal processing circuit and OTDR test circuit, connects described OTDR data processing circuit, and pass through I by spi bus
2c is connected described communication interface with SPI multiplex bus.
9. the ONU optical module with fiber failure measuring ability according to claim 7, it is characterized in that: in described ONU optical module, be also provided with power management module, connect described bus management module, receive described fault test instruction by bus management module, optical time domain reflection circuit is carried out to power supply control.
10. according to the ONU optical module with fiber failure measuring ability described in any one in claim 1 to 6, it is characterized in that: in described optical coupling unit, be provided with laser for communication for launching uplink optical signal, for receiving the detector for communication of downlink optical signal, for launching the test laser of described light pulse and for receiving the test detector of feedback light pulse; Described laser for communication, detector for communication, test separately by after the encapsulation of an encapsulation body, are laid in the side of round and square tube body in optical module with laser and test detector.
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| CN103957052A (en) * | 2014-05-12 | 2014-07-30 | 华为技术有限公司 | Optical fiber fault positioning method, optical module and optical fiber network unit |
| CN104467957A (en) * | 2014-12-04 | 2015-03-25 | 国家电网公司 | Monitoring device beneficial to optical cable line maintenance |
| CN104579490A (en) * | 2014-12-12 | 2015-04-29 | 武汉电信器件有限公司 | Highly integrated OLT optical module |
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| CN103957052A (en) * | 2014-05-12 | 2014-07-30 | 华为技术有限公司 | Optical fiber fault positioning method, optical module and optical fiber network unit |
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| CN111864688A (en) * | 2020-07-07 | 2020-10-30 | 中国南方电网有限责任公司超高压输电公司昆明局 | Ultra-high voltage direct current control protection system OTDR (optical time Domain reflectometer) layered multi-stage event accurate extraction and positioning method |
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