CN202077027U - Optical transmission module with OTDR (optical time domain reflectometer) function and optical communication equipment with OTDR function - Google Patents
Optical transmission module with OTDR (optical time domain reflectometer) function and optical communication equipment with OTDR function Download PDFInfo
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- CN202077027U CN202077027U CN2011200959621U CN201120095962U CN202077027U CN 202077027 U CN202077027 U CN 202077027U CN 2011200959621 U CN2011200959621 U CN 2011200959621U CN 201120095962 U CN201120095962 U CN 201120095962U CN 202077027 U CN202077027 U CN 202077027U
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Abstract
Disclosed is an optical transmission module with an OTDR (optical time domain reflectometer) function and optical communication equipment with an OTDR function. The scheme includes that on the basis of an original circuit of the inside of the optical transmission module or the optical communication equipment, the OTDR function is added to the optical transmission module or the optical communication equipment by adding few elements, so that cost of monitoring optical fibers in optical network maintenance is reduced and the monitoring optical fibers are simplified. The optical transmission module with OTDR function comprises a laser, a driving circuit, a circuit for modulating and superimposing an OTDR testing signal to emitting optical power, an optical signal receiving circuit, a circuit for amplifying and sampling optical-electrical conversion signals and analyzing data, and the like. The optical communication equipment with the OTDR function includes three types; the first type is common optical communication equipment provided with an optical transmission module with the complete OTDR function so as to be the optical communication equipment with the OTDR function; the second type is optical communication equipment provided with an optical transmission module only with the function of transmitting OTDR testing signals, and then a main circuit board completes the rest OTDR testing functions; and the third type is a main circuit board of the optical communication equipment with the complete OTDR function so that an optical module is omitted.
Description
Technical field
The utility model relates to optical communication technique, particularly the light delivery module and the optical communication equipment of band optical time domain reflectometer test function in the optical fiber communication.
Background technology
At present, there are various types of optical communication networks on the market, such as: EPON (PON), SDH (Synchronous Digital Hierarchy) optical-fiber network (SDH), PDH (Pseudo-synchronous Digital Hierarchy) optical-fiber network (PDH), dedicated optical network or the like.Connect with optical fiber between inner each node of these optical-fiber networks, for guaranteeing communication quality, important fibre circuit need be tested and monitor with optical time domain reflectometer (OTDR).
The English full name of optical time domain reflectometer (OTDR) is Optical Time Domain Reflectometer.OTDR is the backscattering that produced of Rayleigh scattering when utilizing light to transmit in optical fiber and Fresnel reflection and the optoelectronic integration instrument of the precision made, it is widely used among the maintenance, construction of lightguide cable link, can carry out the measurement of transmission attenuation, the joint decay of fiber lengths, optical fiber and fault location etc.
In using at the scene, need purchase special-purpose OTDR and supporting testing apparatus during the optical communication equipment networking, the optical fiber that connects is tested and monitored.Optical time domain reflectometer (OTDR) is by direct-connected optical fiber or utilize specific wavelength light pulse insertion optical fiber to test, Test Networking scheme complexity, and the OTDR equipment price is high.Above factor causes complexity height, the cost height with the optical-fiber network maintenance of monitoring fiber functions.
The utility model content
The technical problems to be solved in the utility model is, provide a kind of with the light delivery module of OTDR function and the optical communication equipment of band OTDR function, make light delivery module or optical communication equipment add the OTDR function, can save OTDR equipment and supporting testing apparatus, reduce the complexity and the cost of the optical-fiber network maintenance of band monitoring fiber functions for the special use of monitoring optical fiber.
The technical scheme that the utility model solve the technical problem employing is to provide a kind of with the light delivery module of OTDR function and the optical communication equipment of band OTDR function.
1. be with the light delivery module of OTDR function, it is characterized in that part comprises: the modulation of laser and drive circuit, OTDR test signal be added to circuit, the optical signal receiving circuit of emission luminous power, the amplification sampling and the data analysis circuit of photoelectric conversion signal; The annexation that laser and drive circuit and OTDR test signal are modulated the circuit of the emission luminous power that is added to is, special digital circuit FPGA or special chip produce OTDR test signal sign indicating number type, OTDR test signal control metal-oxide-semiconductor high-speed current switch carries out the folding operation, the OTDR test signal is converted to small size electric current to be changed, be added on the laser bias current, make the emission luminous power carry out fluctuation within a narrow range, so just the modulation of OTDR test signal is added to and transmits on the light signal of data according to the variation of OTDR test signal; The amplification sampling of optical signal receiving circuit and photoelectric conversion signal and the annexation of data analysis circuit are, in optical signal receiving circuit, the optical coupler that receives the reverberation special use is coupled out the light signal that testing fiber reflects, the photoelectric switching circuit of reflected light signal realizes receiving the conversion of reflected optical power to the signal of telecommunication, the photoelectric current that reverberation irradiates light electric diode produces flows through resistance and forms magnitude of voltage, in the amplification sampling and data analysis circuit of photoelectric conversion signal, the size of the magnitude of voltage that variable-gain amplification circuit can produce according to reverberation selects suitable multiplication factor to amplify, sampling and analog to digital conversion circuit are sampled to the signal after amplifying, realize the conversion of analog signal to digital signal, the clock frequency of synchronized sampling is the integral multiple of OTDR frequency test signal, the storage of sampled data and analysis are finished by on-site programmable gate array FPGA or special chip, according to the proportionate relationship of the reverberation average received power value that records with the emission optical power value, can converse to equal proportion the transmission attenuation of testing fiber, extracting undulating value by OTDR test signal source clock frequency from the sampled data of representing received optical power is alternating component, this group alternating component inside comprises the signal that the OTDR testing source reflects in optical fiber, reflection measurement signal and OTDR testing source repeatedly contrast, can analytical calculation find the time-delay of two groups of signals, record delay value and can extrapolate the distance of corresponding pip, range information is used for the positioning optical waveguides tie point, fibre-optic terminus or breakpoint.
2. as 1 described light delivery module, it is characterized in that described laser and drive circuit comprise light emission secondary module TOSA, laser bias current control circuit, laser modulation current control circuit.
3. as 1 described light delivery module, it is characterized in that the part of described optical signal receiving circuit comprises optical coupler and the photoelectric switching circuit that receives the reverberation special use; The optical coupler coupled reflection light of described special use is also isolated emission light, and can launch secondary module TOSA with light and integrate, also can be independent the installation.
4. as 1 described light delivery module, it is characterized in that the amplification sampling of described photoelectric conversion signal and the part of data analysis circuit comprise the storage and the analysis circuit of variable-gain amplification circuit, sampling and analog to digital conversion circuit, sampled data.
5. the optical communication equipment of band OTDR function is characterized in that part comprises: shell and accessory, as light delivery module, the main circuit board of arbitrary described band OTDR function among the above 1-4.
The beneficial effects of the utility model are, by on light delivery module or the inner existing circuit base of optical communication equipment, increase a few components and make it to increase the OTDR function, the light delivery module of band OTDR function and the optical communication equipment of band OTDR function are provided at low cost, simplify the scheme of monitoring optical fiber, reduced the complexity of the optical-fiber network maintenance of band monitoring fiber functions; By saving OTDR equipment and supporting testing apparatus, reduced the cost of monitoring optical fiber during optical-fiber network is safeguarded for the special use of monitoring optical fiber.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Fig. 1 is the embodiment schematic diagram of the light delivery module of band OTDR function of the present utility model.
Fig. 2 is the embodiment schematic diagram of the optical communication equipment of band OTDR function of the present utility model.
Embodiment
The specific embodiment of the light delivery module of band OTDR function of the present utility model is referring to Fig. 1.
The light delivery module of band OTDR function comprises with the lower part: be added to circuit, the optical signal receiving circuit of emission luminous power, the signal of opto-electronic conversion of laser and drive circuit, the modulation of OTDR test signal amplifies sampling and data analysis circuit or the like.Below each several part is described in detail.
1. the part of laser and drive circuit comprises: light emission secondary module TOSA(includes laser), regulate the bias current control circuit of average emitted luminous power, the modulated current control circuit of the instantaneous emission luminous power of modulation.Below explanation respectively.
Laser among the light emission secondary module TOSA can be luminous under the driving of electric current, the emission luminous power within the specific limits with current value relation in direct ratio.
The part of regulating the bias current control circuit of average emitted luminous power comprises: D/A D/A converting circuit, operational amplifier, NPN triode and resistance R i.Wherein operational amplifier, NPN triode and resistance R i form an adjustable current source.Its operation principle is: aanalogvoltage of D/A D/A converting circuit output is given operational amplifier '+' utmost point, operational amplifier '+' high in '-' utmost point then output level Vo control make the increase of NPN triode (between c and the e utmost point) electric current; The electric current increase causes the pressure drop of Ri to increase (being that operational amplifier '-' pole tension increases), when operational amplifier '-' pole tension is increased to when extremely equating with '+', the electric current of output level Vo control the stopping NPN triode (between the c and the e utmost point) of operational amplifier continues to increase, and the electric current that flows through the triode c utmost point like this maintains steady state value.The current value of the analog voltage adjustable current source of D/A D/A converting circuit output, this electric current is through laser and determined the average emitted optical power value.
The laser modulation current control circuit is mainly realized by chip MAX3656 is inner, its principle is: difference sends inner two metal-oxide-semiconductors of variation control chip (MOS1 and MOS2) of data (TD+/TD-) value and opens in turn, producing at a high speed big electric current at the OUT+ pin changes, this bigger electric current variation is the process laser, therefore instantaneous transmitting optical power can change and significantly change at a high speed along with sending data value, and instantaneous luminous power can reflect the variation of transmitting data value.
2. the be added to circuit of emission luminous power of OTDR test signal modulation is as described below.
Field programmable gate array (FPGA) or special chip produce OTDR test signal sign indicating number type (comprising pulse, pseudo-random binary sequence PRBS sign indicating number type, special test sign indicating number type etc.); The BEN+/BEN-pin of difference OTDR test signal Sotdr+/Sotdr-input chip MAX3656, these two pin level change inner two metal-oxide-semiconductors of control chip (MOS3 and MOS4) and open in turn, producing the little electric current of low speed at the BIAS+ pin changes, this little electric current variation is the process laser, so transmitting optical power also can be along with difference OTDR test signal value changes and slightly low speed fluctuation.By above method, just can be added to the modulation of OTDR test signal and transmit on the light signal of data.The speed of transmission data is that 10 of OTDR test signal speed arrives hundred times, the big electric current amplitude of variation that the transmission data cause is more than 10 times of little electric current amplitude of variation that the OTDR test signal causes, and the OTDR test signal that can guarantee to superpose can not have influence on transmission of data signals.
3. the part of optical signal receiving circuit comprises: light-receiving secondary module ROSA, the amplitude limiting amplifier circuit that receives data-signal, the optical coupler that receives the reflected light signal special use, the photoelectric switching circuit of reflected light signal.
Light-receiving secondary module ROSA receives the light signal of opposite end optical module transmission and finishes opto-electronic conversion, by amplitude limiting amplifier circuit signal is amplified shaping again, and output receives data-signal.
Optical module TOSA and ROSA that two fibres are two-way are independently, and the optical module TOSA of single fiber bi-directional and ROSA are (being collectively referred to as BOSA) that integrates.The optical coupler that receives the reverberation special use can integrate with TOSA, also can be independent the installation.
The function that receives the optical coupler of reverberation special use is that the light signal that testing fiber reflects is coupled out, and has the radiative effect of isolation laser device.
The photoelectric switching circuit of reflected light signal realizes receiving the conversion of reflected optical power to the signal of telecommunication, and the photoelectric current that reverberation irradiates light electric diode produces flows through resistance and forms magnitude of voltage Vr.
4. the amplification sampling of photoelectric conversion signal and the part of data analysis circuit comprise: the storage of variable-gain amplification circuit, sampling and analog to digital conversion circuit, sampled data and analysis circuit etc.Below explanation respectively.
The size of the voltage Vr value that variable-gain amplification circuit can produce according to reverberation selects suitable multiplication factor to amplify.
Sampling and analog to digital conversion circuit are sampled to the signal after amplifying, and realize the conversion of analog signal to digital signal, and the clock frequency of synchronized sampling is the integral multiple (multiple is more than or equal to 1) of OTDR frequency test signal.
The storage of sampled data and analysis are finished by field programmable gate array (FPGA) or special chip, and the principle of data analysis is as described below.
According to the proportionate relationship of the scattering that records/reverberation average received power value, can converse to equal proportion the transmission attenuation of testing fiber with the emission optical power value.
Extract undulating value (being alternating component) by OTDR test signal source clock frequency from the sampled data of representing received optical power, this group alternating component is by forming with the lower part: the signal that the OTDR testing source reflects in optical fiber, noise jamming signal.By repeatedly testing the effectively filtering noise jamming of average method, the reflection measurement signal and the OTDR testing source of filtering clutter repeatedly contrast, and can analytical calculation find the time-delay t of two groups of signals.According to following formula, record time-delay t value can extrapolate corresponding pip apart from d, be used for positioning optical waveguides tie point, fibre-optic terminus or breakpoint apart from d information.
d=(c×t)/2(IOR)
In this formula, c is a light speed in a vacuum, and t is that signal emission back is to the total time that receives signal (round trip) (it is exactly the distance of one way after 2 again that two values multiply each other).Because light is slower than speed in a vacuum in glass, so for measuring distance accurately, tested optical fiber must indicate refractive index (IOR).IOR is indicated by the optical fiber production merchant.
The specific embodiment of the optical communication equipment of band OTDR function of the present utility model is referring to Fig. 2.
The optical communication equipment of band OTDR function comprises with the lower part: the light delivery module of shell and accessory, band OTDR function, main circuit board etc.According to the distribution of OTDR test function between main circuit board and the light delivery module, the optical communication equipment of following three types band OTDR function is arranged.
1. the light delivery module of general optical communication equipment mounting strap OTDR function becomes the optical communication equipment of being with the OTDR function, and the light delivery module that its is installed possesses the complete OTDR function that sends to the received signal data analysis from the generation of OTDR test signal.
2. the optical communication equipment main circuit board is finished the generation of OTDR test signal, the opto-electronic conversion of scattering/reflected light signal, amplification sampling and these a few part of O TDR Test functions of data analysis of photoelectric conversion signal, and the light delivery module that it is installed only possesses the part of O TDR Test function that the OTDR test signal sends.Can reduce the complexity of light delivery module like this, be easy to realize.The main circuit schematic diagram of the optical communication equipment of this type band OTDR function is referring to Fig. 2.
3. the optical communication equipment main circuit board possesses the complete OTDR function that sends to the received signal data analysis from the generation of OTDR test signal, can save the light delivery module of special-purpose band OTDR function, and the optical communication equipment cost of this type band OTDR function is lower.
It should be noted last that: above execution mode is the unrestricted the technical solution of the utility model in order to explanation only, although the utility model has been done detailed description with reference to above-mentioned execution mode, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the utility model, and not breaking away from any modification or partial replacement of spirit and scope of the present utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (5)
1. be with the light delivery module of OTDR function, it is characterized in that part comprises: the modulation of laser and drive circuit, OTDR test signal be added to circuit, the optical signal receiving circuit of emission luminous power, the amplification sampling and the data analysis circuit of photoelectric conversion signal; The annexation that laser and drive circuit and OTDR test signal are modulated the circuit of the emission luminous power that is added to is, special digital circuit FPGA or special chip produce OTDR test signal sign indicating number type, OTDR test signal control metal-oxide-semiconductor high-speed current switch carries out the folding operation, the OTDR test signal is converted to small size electric current to be changed, be added on the laser bias current, make the emission luminous power carry out fluctuation within a narrow range, so just the modulation of OTDR test signal is added to and transmits on the light signal of data according to the variation of OTDR test signal; The amplification sampling of optical signal receiving circuit and photoelectric conversion signal and the annexation of data analysis circuit are, in optical signal receiving circuit, the optical coupler that receives the reverberation special use is coupled out the light signal that testing fiber reflects, the photoelectric switching circuit of reflected light signal realizes receiving the conversion of reflected optical power to the signal of telecommunication, the photoelectric current that reverberation irradiates light electric diode produces flows through resistance and forms magnitude of voltage, in the amplification sampling and data analysis circuit of photoelectric conversion signal, the size of the magnitude of voltage that variable-gain amplification circuit can produce according to reverberation selects suitable multiplication factor to amplify, sampling and analog to digital conversion circuit are sampled to the signal after amplifying, realize the conversion of analog signal to digital signal, the clock frequency of synchronized sampling is the integral multiple of OTDR frequency test signal, the storage of sampled data and analysis are finished by on-site programmable gate array FPGA or special chip, according to the proportionate relationship of the reverberation average received power value that records with the emission optical power value, can converse to equal proportion the transmission attenuation of testing fiber, extracting undulating value by OTDR test signal source clock frequency from the sampled data of representing received optical power is alternating component, this group alternating component inside comprises the signal that the OTDR testing source reflects in optical fiber, reflection measurement signal and OTDR testing source repeatedly contrast, can analytical calculation find the time-delay of two groups of signals, record delay value and can extrapolate the distance of corresponding pip, range information is used for the positioning optical waveguides tie point, fibre-optic terminus or breakpoint.
2. light delivery module as claimed in claim 1 is characterized in that, described laser and drive circuit comprise light emission secondary module TOSA, laser bias current control circuit, laser modulation current control circuit.
3. light delivery module as claimed in claim 1 is characterized in that, the part of described optical signal receiving circuit comprises optical coupler and the photoelectric switching circuit that receives the reverberation special use; The optical coupler coupled reflection light of described special use is also isolated emission light, and can launch secondary module TOSA with light and integrate, also can be independent the installation.
4. light delivery module as claimed in claim 1 is characterized in that, the amplification sampling of described photoelectric conversion signal and the part of data analysis circuit comprise the storage and the analysis circuit of variable-gain amplification circuit, sampling and analog to digital conversion circuit, sampled data.
5. the optical communication equipment of band OTDR function is characterized in that part comprises: shell and accessory, as light delivery module, the main circuit board of arbitrary described band OTDR function among the claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200959621U CN202077027U (en) | 2011-04-02 | 2011-04-02 | Optical transmission module with OTDR (optical time domain reflectometer) function and optical communication equipment with OTDR function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200959621U CN202077027U (en) | 2011-04-02 | 2011-04-02 | Optical transmission module with OTDR (optical time domain reflectometer) function and optical communication equipment with OTDR function |
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| CN202077027U true CN202077027U (en) | 2011-12-14 |
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| CN2011200959621U Expired - Fee Related CN202077027U (en) | 2011-04-02 | 2011-04-02 | Optical transmission module with OTDR (optical time domain reflectometer) function and optical communication equipment with OTDR function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873141A (en) * | 2012-12-11 | 2014-06-18 | 中兴通讯股份有限公司 | Fiber digital OTDR detection method and apparatus |
| CN106160853A (en) * | 2015-04-01 | 2016-11-23 | 索尔思光电（成都）有限公司 | A kind of multi-functional LD drive circuit, module and method |
| CN106160854A (en) * | 2015-04-01 | 2016-11-23 | 索尔思光电（成都）有限公司 | A kind of multifunctional light electrical communications circuit, module, equipment and method |
| CN113156397A (en) * | 2021-06-25 | 2021-07-23 | 雷神等离子科技(杭州)有限公司 | High-sensitivity laser radar and signal processing method and positioning method thereof |
| CN113711506A (en) * | 2019-04-18 | 2021-11-26 | 微软技术许可有限责任公司 | Increased throughput transmitter for optical communications |
| WO2022048467A1 (en) * | 2020-09-03 | 2022-03-10 | 华为技术有限公司 | Optical signal detection apparatus and method and related device |
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2011
- 2011-04-02 CN CN2011200959621U patent/CN202077027U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873141A (en) * | 2012-12-11 | 2014-06-18 | 中兴通讯股份有限公司 | Fiber digital OTDR detection method and apparatus |
| CN103873141B (en) * | 2012-12-11 | 2016-12-07 | 中兴通讯股份有限公司 | Optical fiber and digital OTDR detection method and device |
| CN106160853A (en) * | 2015-04-01 | 2016-11-23 | 索尔思光电（成都）有限公司 | A kind of multi-functional LD drive circuit, module and method |
| CN106160854A (en) * | 2015-04-01 | 2016-11-23 | 索尔思光电（成都）有限公司 | A kind of multifunctional light electrical communications circuit, module, equipment and method |
| CN106160853B (en) * | 2015-04-01 | 2019-01-18 | 索尔思光电（成都）有限公司 | A kind of multi-functional LD driving circuit, module and method |
| CN106160854B (en) * | 2015-04-01 | 2019-01-18 | 索尔思光电（成都）有限公司 | A kind of multifunctional light electrical communications circuit, module, equipment and method |
| CN113711506A (en) * | 2019-04-18 | 2021-11-26 | 微软技术许可有限责任公司 | Increased throughput transmitter for optical communications |
| WO2022048467A1 (en) * | 2020-09-03 | 2022-03-10 | 华为技术有限公司 | Optical signal detection apparatus and method and related device |
| CN113156397A (en) * | 2021-06-25 | 2021-07-23 | 雷神等离子科技(杭州)有限公司 | High-sensitivity laser radar and signal processing method and positioning method thereof |
| CN113156397B (en) * | 2021-06-25 | 2021-10-19 | 雷神等离子科技(杭州)有限公司 | High-sensitivity laser radar and signal processing method and positioning method thereof |
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