CN203719675U - Coded pulse optical signal-based OTDR device - Google Patents
Coded pulse optical signal-based OTDR device Download PDFInfo
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- CN203719675U CN203719675U CN201420064242.2U CN201420064242U CN203719675U CN 203719675 U CN203719675 U CN 203719675U CN 201420064242 U CN201420064242 U CN 201420064242U CN 203719675 U CN203719675 U CN 203719675U
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Abstract
The utility model discloses a coded pulse optical signal-based OTDR device used for detecting an optical fiber to be detected. The OTDR device comprises an optical emitting unit, an optical receiving unit, a main control unit and a coupling unit, wherein the main control unit is used for respectively controlling the optical emitting unit and the optical receiving unit, the optical emitting unit is used for sending coded pulse optical signals to the optical fiber to be detected, and the optical receiving unit is used for receiving backscattering signals from the optical fiber to be detected. The beneficial effects of the coded pulse optical signal-based OTDR device are that through use of the OTDR device provided by the utility model, multiple groups of coded pulses can be adopted for testing operation. For example, as for an optical fiber at close range, a high resolution coded pulse can be adopted; as for an optical fiber at a great distance, a large dynamic range coded pulse can be adopted; as for events at different distance, different coded pulses are used for testing and analyzing operation; optimum effects can be reached for measurement of events at all distance, and related OTDR performance is improved in an all-around manner.
Description
Technical field
The utility model belongs to optical time domain reflection (OTDR) technical field, is specifically related to a kind of OTDR device and method based on coded pulse light signal.
Background technology
Optical time domain reflectometer (Optical Time-Domain Reflectometry, OTDR) is by the instrument of backscattering and reflected signal measuring optical fiber transport property.In the backscatter signals producing when light transmits in optical fiber, contained bulk information, because OTDR metering system is easy and practical, thereby be widely used in construction and the maintenance of fiber optic communication field, along with the development of the technology of Fibre Optical Sensor, OTDR is also more and more in the application in this field.
Along with optical fiber communication repeater span constantly increases, the dynamic range of OTDR is required also constantly to increase.The dB that dynamic range is normally defined between optical fiber initial end signal dispersion intensity and noise peak is poor, and dynamic range is larger, and measurable fiber distance is longer.Generally, improve dynamic range and mainly rely on and increase light impulse length and increase accumulative frequency, but due to the restriction of time, accumulative frequency can only be got some finite values, and increases light impulse length, means that resolution can variation.
Utility model content
In order to overcome the defect existing in prior art, the utility model provides a kind of OTDR device based on coded pulse light signal, adopt the different coded pulse light signal of many groups to test, both can improve dynamic range and resolution, and can guarantee again all to obtain good test effect in different fiber distance.Concrete technical scheme is as follows:
An OTDR device based on coded pulse light signal, for event on a testing fiber is detected, this OTDR device comprises:
For launch successively the Optical Transmit Unit of the dissimilar coded pulse light signal of many groups to testing fiber; For gathering the many groups backscattering light signal being returned by testing fiber successively, obtain the light receiving unit that detects data; And the main control unit of processing for the detection data analysis that light receiving unit is collected;
Wherein, main control unit is connected with light receiving unit; Coded pulse light signal refers to the pulsed optical signals that comprises pseudorandom sequence coding.
As prioritization scheme, Optical Transmit Unit comprises light source; And drive coding, the coding generation module of the coded pulse light signal that the many groups of driving light source transmitting are dissimilar for generating; Main control unit is connected with coding generation module.
As prioritization scheme, light receiving unit comprises photodetection module, and photodetection module is connected with testing fiber.
As prioritization scheme, light receiving unit also comprises amplification module, filtration module and the analog-to-digital conversion module connecting successively; Amplification module is connected with photodetection module, and analog-to-digital conversion module is connected with main control unit.
As prioritization scheme, light receiving unit comprises spectral module and at least two photodetection modules, and spectral module is connected with testing fiber.
As prioritization scheme, light receiving unit also comprises at least one group of amplification module connecting successively, filtration module and analog-to-digital conversion module; Each photodetection module corresponding one group of amplification module, filtration module and analog-to-digital conversion module; All analog-to-digital conversion modules are connected with main control unit respectively.
As prioritization scheme, this OTDR device also comprises coupling unit, and one end of coupling unit is connected with light receiving unit with Optical Transmit Unit respectively, and the other end of coupling unit is connected with testing fiber.
As prioritization scheme, between each photodetection module and spectral module, be equipped with an optical filter.
As prioritization scheme, spectral module is optical splitter.
As prioritization scheme, coupling unit is bidirectional coupler or circulator.
Compared with prior art, the utlity model has following beneficial effect:
(1) can utilize the OTDR device that the utility model provides to adopt the pulse of many group codings to test; For example, can use high resolving power coding to the optical fiber of closely locating, remote optical fiber is used to great dynamic range coding, the event at different distance place is used different coding pulse to carry out test analysis, to the affair of all distances, can reach optimum efficiency like this, the comprehensive performance that improves relevant OTDR;
(2) when can utilize OTDR device that the utility model provides to realize Rayleigh scattering, Raman scattering, Brillouin scattering, detect, the event argument obtaining comprises reflectivity, loss, attenuation rate, temperature, stress etc., has enriched the test function of OTDR.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the structured flowchart of embodiment 1;
Fig. 3 is the structured flowchart of embodiment 2.
In upper figure, sequence number is: 1-main control unit, 11-control module, 12-data processing module, 2-Optical Transmit Unit, 21-coding generation module, 22-light source, 3-light receiving unit, 31-photodetection module, 32-amplification module, 33-filtration module, 34-pattern modular converter, 35-spectral module, 36-optical filter, 4-coupling unit, 5-testing fiber.
Embodiment
Below in conjunction with accompanying drawing, in the mode of embodiment, describe the utility model in detail.
Embodiment 1:
As shown in Figure 1, a kind of OTDR device based on coded pulse light signal, for event on a testing fiber 5 is detected, this OTDR device comprises Optical Transmit Unit 2, light receiving unit 3, main control unit 1 and coupling unit 4.Main control unit 1 is connected with light receiving unit 3 with Optical Transmit Unit 2 respectively.
As shown in Figure 2, Optical Transmit Unit 2 enters testing fiber 5 for launching successively the dissimilar coded pulse light signal of many groups; Coded pulse light signal refers to the pulsed optical signals that comprises pseudorandom sequence coding.Optical Transmit Unit 2 comprises light source 22 and coding generation module 21, and coding generation module 21 drives coding for generating, and by this, drives the corresponding coded pulse light signal of coding driving light source 22 transmitting.In actual applications, this drives coding can be Gray code, but is not limited to this, can select according to actual needs.
Corresponding, main control unit 1 is also connected with Optical Transmit Unit 2, and main control unit 1 can be used for arranging modulation parameter, and sends and drive signal to control coding generation module 21 according to modulation parameter.In actual applications, modulation parameter can comprise at least one in code length, type of coding, pulse width, pulse strength and the optical maser wavelength of coded pulse light signal.As a kind of preferably application mode, main control unit 1 can be for the different modulation parameters of many groups are set, and each group modulation parameter at least has at least a parameter different in code length, type of coding, pulse width, pulse strength and optical maser wavelength.Main control unit 1 sends one group of corresponding driving signal to coding generation module 21 according to each group modulation parameter, and coding generation module 21 generates one group and drives accordingly coding, and this drives one group of corresponding coded pulse light signal of coding driving light source 22 transmittings.Therefore, main control unit 1 is controlled the different types of coded pulse light signal of Optical Transmit Unit 2 transmitting according to different types of adjustment parameter.
Light receiving unit 3 is for gathering successively the many groups backscattering light signal being returned by testing fiber.Because Optical Transmit Unit 2 sends many group codings pulsed optical signals successively, light receiving unit 3 need to carry out multi collect, gathers successively many group backscattering light signals.Light receiving unit 3 comprises photodetection module 31, and photodetection module 31 receives backscatter signals, and backscatter signals is converted to initial electrical signal.In the present embodiment, light receiving unit 3 also comprises amplification module 32, filtration module 33 and the analog-to-digital conversion module 34 connecting successively; Initial electrical signal after amplification module 32, filtration module 33 and analog-to-digital conversion module 34, obtains and detects data successively.In the present embodiment, photodetection module 31, amplification module 32, filtration module 33 and analog-to-digital conversion module 34 can be regarded as and formed a light-receiving passage, by light-receiving passage is controlled and can backscatter signals be processed accordingly, therefrom obtain required information.Can to light-receiving passage, control by channel parameters realization is set, channel parameters is set as required, make the detection data of obtaining at rational sampling interval.
Accordingly, main control unit 1 also can be used for arranging channel parameters, and according to channel parameters, photodetection module 31, amplification module 32, filtration module 33 and analog-to-digital conversion module 34 is controlled.In actual applications, channel parameters comprises photodetection voltage, gain amplifier multiple, bandwidth selection parameter and filtering parameter.Wherein, photodetection voltage is corresponding to photodetection module 31, and gain amplifier multiple and bandwidth selection parameter are corresponding to amplification filtering module 33, and filtering parameter is corresponding to filtration module 33.It should be noted that, channel parameters is far above in these, these are only a reference, and the utility model is only claimed to the structure of OTDR device itself, and its concrete application can be adjusted according to actual conditions.
Main control unit 1 is processed for the detection data analysis that light receiving unit 3 is collected.In the present embodiment, main control unit 1 comprises control module 11 and data processing module 12, and wherein, control module 11 is for modulation parameter and channel parameters are set, to realize the control to Optical Transmit Unit 2 and light receiving unit 3.Data processing module 12 carries out rough handling and storage for the detection data that light receiving unit 3 is collected, the data that detect 12 pairs of the data processing modules filtering that adds up, and detection data are deposited in respectively in corresponding storage unit by type, after collection, the storage data upload in storage unit is further processed to control module 11; 11 pairs of storage data of control module are carried out further computing, analysis, obtain final analysis result.
One end of coupling unit 4 is connected with testing fiber 5, and the other end of coupling unit 4 is connected with light receiving unit 3 with Optical Transmit Unit 2 respectively.In the present embodiment, coupling unit 4 adopts bidirectional coupler, is the fiber coupler of two-way communication, but is not limited to this, can also use circulator, and the utility model does not limit the particular type of coupling unit 4, these are only for example.
The workflow of the OTDR device based on coded pulse light signal is as follows:
Main control unit 1, for many group modulation parameters and many group channel parameters are set, first sends corresponding modulation signal to Optical Transmit Unit 2 according to first group of modulation parameter.According to modulation signal, modulation generates corresponding coded signal to Optical Transmit Unit 2, and according to coded signal, drives output the first group coding pulsed optical signals.Coded pulse light signal enters testing fiber 5 after coupling unit 4 coupling, and coded pulse light signal is in the interior generation backscatter signals of testing fiber 5, and backscatter signals enters light receiving unit 3 through coupling unit 4 couplings are laggard.Light receiving unit 3 carries out opto-electronic conversion, amplification, filtering and analog to digital conversion according to one of correspondence group of channel parameters successively to backscatter signals, obtains first group and detects data; Again detection data are sent to main control unit 1 temporary.Main control unit 1 is controlled Optical Transmit Unit 2 transmitting the second group coding pulsed optical signals according to second group of modulation parameter again, and its process is identical with abovementioned steps, does not repeat them here.Launched successively many group codings pulsed optical signals, and received after corresponding many group detection data, main control unit is organized detection data analysis more and is processed 1 pair.
Embodiment 2:
As shown in Figure 3, about the OTDR device based on coded pulse light signal, the difference of the present embodiment and embodiment 1 is:
Light receiving unit 3 comprises spectral module 35 and three photodetection modules 31, and spectral module 35 is divided into backscatter signals the scattering sub-signal of three road different-wavebands, and scattering sub-signal is inputted respectively to corresponding photodetection module 31.Wherein, spectral module 35 is optical splitter.
In the present embodiment, light receiving unit 3 also comprises three groups of amplification modules that connect successively 32, filtration module 33 and analog-to-digital conversion module 34; The corresponding one group of amplification module 32 of each photodetection module 31, filtration module 33 and analog-to-digital conversion module 34.
Be similar to embodiment 1, in the present embodiment, one group of photodetection module 31, amplification module 32, filtration module 33 and analog-to-digital conversion module 34 can be counted as a road light-receiving passage, thereby the present embodiment comprises three road light-receiving passages.One group of channel parameters that main control unit 1 arranges respectively Dui Zhe tri-road light-receiving passages is controlled, and makes the detection data of obtaining at rational sampling interval.
In the present embodiment, between each photodetection module 31 and spectral module 35, be equipped with an optical filter 36.The effect of this optical filter 36 is unwanted light signals in filtering backscatter signals.
In the present embodiment, three tunnel scattering sub-signals are respectively by each self-corresponding optical filter 36, optical filter 36 is by unwanted light signal filtering, by optical filter 36 tri-road signals, be respectively Rayleigh scattering signal, Raman scattering signal and the brillouin scattering signal in backscatter signals, Gai San road signal is converted to three tunnel initial electrical signal through corresponding photodetection module 31 more successively, Gai San road initial electrical signal is passed through corresponding amplification module 32, filtration module 33 and analog-to-digital conversion module 34 more successively, thereby obtain one group, detects data.
Disclosed is above only several specific embodiments of the application, but the not limited thereto the changes that any person skilled in the art can think of of the application all should drop in the application's protection domain.
Claims (10)
1. the OTDR device based on coded pulse light signal, for event on a testing fiber is detected, is characterized in that, this OTDR device comprises:
For launch successively the Optical Transmit Unit of the dissimilar coded pulse light signal of many groups to testing fiber; For gathering the many groups backscattering light signal being returned by described testing fiber successively, obtain the light receiving unit that detects data; And the main control unit of processing for the detection data analysis that described light receiving unit is collected;
Wherein, described main control unit is connected with described light receiving unit; Described coded pulse light signal refers to the pulsed optical signals that comprises pseudorandom sequence coding.
2. a kind of OTDR device based on coded pulse light signal according to claim 1, is characterized in that, described Optical Transmit Unit comprises light source; And drive coding for generating, drive the coding generation module of the dissimilar coded pulse light signal of the many groups of described light source transmitting; Described main control unit is connected with described coding generation module.
3. a kind of OTDR device based on coded pulse light signal according to claim 1 and 2, is characterized in that, described light receiving unit comprises photodetection module, and described photodetection module is connected with described testing fiber.
4. a kind of OTDR device based on coded pulse light signal according to claim 3, is characterized in that, described light receiving unit also comprises amplification module, filtration module and the analog-to-digital conversion module connecting successively; Described amplification module is connected with described photodetection module, and described analog-to-digital conversion module is connected with described main control unit.
5. a kind of OTDR device based on coded pulse light signal according to claim 1 and 2, is characterized in that, described light receiving unit comprises spectral module and at least two photodetection modules, and described spectral module is connected with described testing fiber.
6. a kind of OTDR device based on coded pulse light signal according to claim 5, is characterized in that, described light receiving unit also comprises at least one group of amplification module connecting successively, filtration module and analog-to-digital conversion module; Amplification module, described filtration module and described analog-to-digital conversion module described in corresponding one group of photodetection module described in each; All analog-to-digital conversion modules are connected with described main control unit respectively.
7. a kind of OTDR device based on coded pulse light signal according to claim 1, it is characterized in that, also comprise coupling unit, one end of described coupling unit is connected with described light receiving unit with described Optical Transmit Unit respectively, and the other end of described coupling unit is connected with described testing fiber.
8. a kind of OTDR device based on coded pulse light signal according to claim 5, is characterized in that, is equipped with an optical filter between each photodetection module and described spectral module.
9. a kind of OTDR device based on coded pulse light signal according to claim 5, is characterized in that, described spectral module is optical splitter.
10. a kind of OTDR device based on coded pulse light signal according to claim 7, is characterized in that, described coupling unit is bidirectional coupler or circulator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420064242.2U CN203719675U (en) | 2014-02-13 | 2014-02-13 | Coded pulse optical signal-based OTDR device |
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| CN201420064242.2U CN203719675U (en) | 2014-02-13 | 2014-02-13 | Coded pulse optical signal-based OTDR device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048684A (en) * | 2014-02-13 | 2014-09-17 | 上海温光自动化技术有限公司 | OTDR device and method based on coded pulse optical signals |
| WO2016033812A1 (en) * | 2014-09-05 | 2016-03-10 | 华为技术有限公司 | Optical time domain reflectometer and method thereof for detecting optical fiber |
| WO2017173886A1 (en) * | 2016-04-06 | 2017-10-12 | 深圳市大耳马科技有限公司 | Optical module |
| CN109506686A (en) * | 2018-12-19 | 2019-03-22 | 武汉理工光科股份有限公司 | A method of it improves entirely with optical fiber Grating examinations performance |
| CN109802721A (en) * | 2019-01-18 | 2019-05-24 | 太原理工大学 | OTDR device and measurement method based on physical accidental code correlation detection |
-
2014
- 2014-02-13 CN CN201420064242.2U patent/CN203719675U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048684A (en) * | 2014-02-13 | 2014-09-17 | 上海温光自动化技术有限公司 | OTDR device and method based on coded pulse optical signals |
| CN104048684B (en) * | 2014-02-13 | 2017-01-11 | 一诺仪器（中国）有限公司 | OTDR device and method based on coded pulse optical signals |
| WO2016033812A1 (en) * | 2014-09-05 | 2016-03-10 | 华为技术有限公司 | Optical time domain reflectometer and method thereof for detecting optical fiber |
| US10063314B2 (en) | 2014-09-05 | 2018-08-28 | Huawei Technologies Co., Ltd. | Optical time domain reflectometer and method for detecting optical fiber by using the same |
| WO2017173886A1 (en) * | 2016-04-06 | 2017-10-12 | 深圳市大耳马科技有限公司 | Optical module |
| CN109506686A (en) * | 2018-12-19 | 2019-03-22 | 武汉理工光科股份有限公司 | A method of it improves entirely with optical fiber Grating examinations performance |
| CN109506686B (en) * | 2018-12-19 | 2021-03-23 | 武汉理工光科股份有限公司 | Method for improving detection performance of isotactic fiber bragg grating |
| CN109802721A (en) * | 2019-01-18 | 2019-05-24 | 太原理工大学 | OTDR device and measurement method based on physical accidental code correlation detection |
| CN109802721B (en) * | 2019-01-18 | 2022-02-01 | 太原理工大学 | OTDR device and measuring method based on physical random code correlation detection |
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Address after: 264200 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee after: INNO INSTRUMENT (WEI HAI) Inc. Address before: 264209 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee before: DH INFOTECH (WEIHAI) Inc. |
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