CN103808339A - OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals - Google Patents
OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals Download PDFInfo
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Abstract
The invention discloses an OTDR (optical time domain reflectometry) device and method based on multi-wavelength pulse optical signals. The device and the method are used for detecting an optical fiber to be detected. The device has the advantages that compared with a traditional OTDR, large dynamic range test can be simply realized based on the multi-wavelength pulse optical signals, different distances of the optical fiber are measured by the aid of different wavelengths, single-wavelength pulse saturation or too low signal-to-noise ratio can be avoided, measuring time is saved as compared with a multiple acquisition OTDR or a continuous acquisition OTDR, the device has larger measuring distance and resolution ratio, measurement between wavelengths is independently performed, a test device can run in different states, and multifunctional test is realized.
Description
Technical field
The invention belongs to optical time domain reflection (OTDR) technical field, be specifically related to a kind of OTDR device and method based on multi-Wavelength Pulses light signal.
Background technology
Optical time domain reflectometer (Optical Time-Domain Reflectometry, OTDR) principle is: pulsed light is in the time of Optical Fiber Transmission, because character, connector, joint, bending or other event of optical fiber itself produce backscattering and reflection, this scattering and reflected light turn back to initial end, and are received by photoelectric device.Scattered light mainly comprises by optical fibre refractivity and changes the Rayleigh scattering causing, the Raman scattering that optical phonon causes, the Brillouin scattering that acoustical phonon causes, comprised the information such as loss on the way of optical fiber, temperature, stress in scattered signal.Utilize OTDR to carry out non-destroyed measurement from one end to optical fiber easily, can show the upper variety of event of whole fibre circuit distance.Along with the development of the technology such as optical fiber communication, Fibre Optical Sensor, this technology has obtained great application and propelling, but along with the raising to spatial resolution and measuring distance requirement, OTDR system becomes increasingly complex, Measuring Time is more and more longer, and classic method has been difficult to further improve the performance of OTDR.
In order to improve the dynamic range of OTDR, use traditionally two kinds of methods: increase pulse width, increase the cumulative time.Because the cumulative time can not unrestrictedly increase, increase pulse width and just become main selection, but the increase of pulse width causes spatial resolution to reduce, and makes test performance be difficult to meet the requirements.As [CN 1330265A], this patent has only solved great dynamic range problem, do not solve the too low problem of resolution, and measuring process need to expend more times of times.The continuous acquisition scheme proposing in the patent [US 5155439A] of Tektronix company has proposed the new method addressing the above problem, in continuous acquisition scheme, gather for the first time and use minimum pulse, thereafter each pulse width using that gathers strengthens gradually, until occurred in the signal of measuring that optical fiber connector just stops measuring.The event information obtaining from different acquisition is incorporated in same result, generates single OTDR curve map or list of thing.For each section of optical fiber, can obtain suitable spatial resolution, and measuring distance is also guaranteed like this, but also the saturation problem of having avoided great dynamic range to cause.Although the contradiction of spatial resolution and dynamic range can partly be resolved in described scheme in the above, cost is that Measuring Time increases greatly, even cannot ensure within the specific time and complete measurement.For the measurement of great dynamic range, in order to guarantee the signal to noise ratio (S/N ratio) of end, once gather the time that will expend reach one minute even longer, if carry out multi collect, and the number of times gathering does not limit, and its Measuring Time will be difficult to meet consumers' demand, and limit its application and development.
Summary of the invention
In order to overcome the defect existing in prior art, the invention provides the OTDR device and method based on multi-Wavelength Pulses light signal of short, good test effect of a kind of test duration, concrete technical scheme is as follows:
OTDR device based on multi-Wavelength Pulses light signal, for event on a testing fiber is detected, this OTDR device comprises data processing unit, Optical Transmit Unit and light receiving unit, data processing unit is connected with light receiving unit;
Optical Transmit Unit is for send one group of multi-Wavelength Pulses light signal to testing fiber simultaneously, and Optical Transmit Unit comprises the light source of light compositing module and at least two different centre wavelengths;
Light receiving unit, for gather many groups backscatter signals of being returned by testing fiber simultaneously, obtains detection data; Light receiving unit comprises spectral module and at least two light detection modules corresponding to different centre wavelength light sources;
The detection data analysis processing of data processing unit for light receiving unit is collected.
As prioritization scheme, Optical Transmit Unit also comprises light source driver module, and light source driver module is for driving the light source of different centre wavelengths.
As prioritization scheme, data processing unit is also connected with Optical Transmit Unit, and data processing unit is used for arranging modulation parameter, and sends and drive signal to control light source driver module according to modulation parameter.
As prioritization scheme, modulation parameter comprises the pulse strength, pulse width, type of coding and the code length that drive signal.
As prioritization scheme, light receiving unit also comprises amplification filtering module and analog-to-digital conversion module, and light detection module outputs signal to amplification filtering module, and amplification filtering module output signal is to analog-to-digital conversion module.
As prioritization scheme, amplification filtering module comprises some amplification filtering passages, each amplification filtering passage and a corresponding connection of light detection module; Analog-to-digital conversion module comprises some analog to digital conversion passages, each analog to digital conversion passage and a corresponding connection of amplification filtering passage.
As prioritization scheme, data processing unit is used for arranging channel parameters, and light detection module, amplification filtering module and analog-to-digital conversion module are controlled.
As prioritization scheme, channel parameters comprises photo-detection voltage, gain amplifier parameter, bandwidth parameter and offset parameter.
As prioritization scheme, also comprise coupling unit, one end of coupling unit is connected with Optical Transmit Unit and light receiving unit respectively, and the other end of coupling unit is connected with testing fiber.
As prioritization scheme, the wavelength coverage of multi-Wavelength Pulses light signal is 1210nm ~ 1650nm.
As prioritization scheme, light compositing module is directional coupler, wavelength division multiplexer or planar optical waveguide.
As prioritization scheme, light detection module is APD photodiode.
As prioritization scheme, drive pulse code or single pulse signal that signal is pseudo-random sequence.
As prioritization scheme, pulse code adopts Gray code, S code or bi-orthogonal coded.
As prioritization scheme, coupling unit is bidirectional coupler or circulator.
OTDR method based on multi-Wavelength Pulses light signal, for event on a testing fiber is detected, comprises the steps:
Step a sends one group of multi-Wavelength Pulses light signal to testing fiber simultaneously; Wherein, multi-Wavelength Pulses light signal refers to the pulsed optical signals that comprises at least two different centre wavelengths;
Step b gathers many groups backscatter signals of being returned by testing fiber simultaneously, obtains many groups and detects data;
Step c, to the detection data analysis processing collecting, obtains optimum OTDR curve map and list of thing.
As prioritization scheme, multi-Wavelength Pulses light signal is through driving signal modulation.
As prioritization scheme, drive the pulse code that signal is pseudo-random sequence.
As prioritization scheme, the collection to backscatter signals in step b is specially:
Backscatter signals is carried out to light splitting, obtain the scattering sub-signal of some different-wavebands, then each road scattering sub-signal is carried out respectively to opto-electronic conversion, amplification filtering and analog to digital conversion, obtain some detection data.
As prioritization scheme, in step c, the many groups of analyzing and processing that detect data are specially:
Step c1, event searching, to detecting data analysis, all events that exist in search optical fiber link, calculate event argument, obtain list of thing;
Step c2, combines the signal data at testing fiber different distance place, generates optimum OTDR curve map according to the data after combination.
As prioritization scheme, the event searching method in step c1 is specially:
According to corresponding wavelength, priority is set by detecting data with reference to different event types, all parameters of all events, all corresponding the highest detection extracting data of priority.
As prioritization scheme, the data combined method in step c2 is specially:
Without event place, if signal to noise ratio (S/N ratio) is not less than a default threshold value, select minimum pulse wavelength signals;
There iing event place, selecting event type to identify best wavelength signals.
As prioritization scheme, if driving signal is pulse code, before step c, also comprise data decode step, be specially:
Adopt the inverse matrix corresponding with pulse code to detect data to each group that collects and carry out respectively data decode, and storage.
Compared with prior art, the present invention has following beneficial effect:
(1) with respect to traditional OTDR, the present invention is based on the pulsed optical signals of multi-wavelength, can test by simple realization great dynamic range, by the different distance of different wave length measuring optical fiber, can avoid the state that single wavelength pulse is saturated or signal to noise ratio (S/N ratio) is too low;
(2) with respect to many collection OTDR or continuous acquisition OTDR, the present invention has higher test performance (resolution, dynamic range), and has saved Measuring Time, for example, use dual wavelength OTDR can save about 1/2 time, three-wavelength can be saved about 2/3 time;
(3) in the present invention,, because the measurement between each wavelength is independently to carry out, proving installation can move under different conditions, realizes multifunctional testing; For example, some wave band is in on-line testing, and some wave band is in common test; Or in test process, separate a certain wave band and carry out test or the analysis of other Fiber-optic parameter (as fiber lengths, vibration, temperature etc.); Will greatly enrich OTDR function.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is the structured flowchart of light emission module;
Fig. 3 is the structured flowchart of Optical Receivers.
In upper figure, sequence number is: 1-data processing unit, 2-Optical Transmit Unit, 21-light source driver module, 22-light source, 23-light compositing module, 3-light receiving unit, 31-spectral module, 32-light detection module, 33-amplification filtering module, 34-analog-to-digital conversion module, 4-coupling unit, 5-testing fiber.
Embodiment
Describe the present invention below in conjunction with accompanying drawing in detail in the mode of embodiment.
Embodiment 1:
As shown in Figure 1, the OTDR device based on multi-Wavelength Pulses light signal, for a testing fiber 5 is detected, this OTDR device comprises data processing unit 1, Optical Transmit Unit 2, light receiving unit 3 and coupling unit 4.
As shown in Figure 2, Optical Transmit Unit 2 is for send one group of multi-Wavelength Pulses light signal simultaneously to testing fiber, and Optical Transmit Unit 2 comprises the light source 22 of light compositing module 23 and at least two different centre wavelengths.Light compositing module 23 is coupled for the pulsed light of different wave length that multiple light sources 22 are launched.In the present embodiment, light compositing module 23 is directional coupler, i.e. the fiber coupler of one-way communication, but be not limited to this, can also adopt wavelength division multiplexer (WDM) or planar optical waveguide (PLC), the present invention does not limit the particular type of light compositing module 23, these are only for example.
In the present embodiment, Optical Transmit Unit 2 also comprises light source driver module 21, and light source driver module 21 is for driving the light source 22 of different centre wavelengths.The present invention is not limited to adopt this light source driver module 21, the technique effect that only adopt multi-Wavelength Pulses light signal can realize and save Measuring Time, improves test effect.In the present embodiment, light source driver module 21 comprises that some light sources drive, and each light source drives a corresponding light source 22, see Fig. 2, but be not limited to this, also can drive corresponding multiple light sources 22 by a light source, can meet the required wave band of all light sources 22 as long as light source drives.
Accordingly, data processing unit 1 can be used for arranging modulation parameter, and light source driver module 21 is controlled, and sends the corresponding signal controlling light source driver module 21 that drives according to the modulation parameter arranging, and multi-Wavelength Pulses light signal is modulated.In the present embodiment, drive pulse code or the single pulse signal that signal is pseudo-random sequence; Wherein, pulse code can adopt Gray code, S code or bi-orthogonal coded.This pulse code can improve the signal to noise ratio (S/N ratio) of multi-Wavelength Pulses light signal, increases dynamic range, saves Measuring Time, has again improved the performance of OTDR on the basis of multi-Wavelength Pulses light signal.Wherein, modulation parameter comprises the pulse strength, pulse width, type of coding and the code length that drive signal.
As shown in Figure 3, light receiving unit 3, for gather many groups backscatter signals of being returned by testing fiber simultaneously, obtains detection data; Comprise spectral module 31 and at least two light detection modules 32 corresponding to different centre wavelength light sources; In the present embodiment, light detection module 32 is APD photodiode.
In the present embodiment, light receiving unit 3 also comprises amplification filtering module 33 and analog-to-digital conversion module 34, and light detection module 32 outputs signal to amplification filtering module 33, and amplification filtering module 33 outputs signal to analog-to-digital conversion module 34.Wherein, amplification filtering module 33 comprises some amplification filtering passages, each amplification filtering passage and a corresponding connection of light detection module; Analog-to-digital conversion module 34 comprises some analog to digital conversion passages, each analog to digital conversion passage and a corresponding connection of amplification filtering passage.In the present embodiment, light detection module has formed a light-receiving passage with corresponding amplification filtering passage and corresponding analog to digital conversion passage, can think and in light receiving unit 3, comprise several light-receiving passages, by these light-receiving passages are controlled and can each road backscatter signals be processed accordingly, thereby obtain required detection data.Can control these light-receiving passages by channel parameters realization is set.
Accordingly, data processing unit 1 can be used for arranging channel parameters, light detection module 32, amplification filtering module 33 and analog-to-digital conversion module 34 are controlled, by channel parameters control opto-electronic conversion, amplification filtering and analog-to-digital process being set to obtain required detection data.Wherein, channel parameters comprises photo-detection voltage, gain amplifier parameter, bandwidth parameter and offset parameter.Wherein, photo-detection voltage is corresponding to light detection module 32, and gain amplifier parameter and bandwidth parameter be corresponding to amplification filtering module 33, and offset parameter is corresponding to the bias current in light detection module 32, and bias voltage in amplification filtering module 33.It should be noted that, channel parameters is far above in these, and the present invention is not restricted the kind of channel parameters.
The detection data analysis processing of data processing unit 1 for light receiving unit 3 is collected.
One end of coupling unit 4 is connected with Optical Transmit Unit 2 and light receiving unit 3 respectively, and the other end of coupling unit 4 is connected with testing fiber 5.In the present embodiment, coupling unit 4 is bidirectional coupler, i.e. the fiber coupler of two-way communication, but be not limited to this, and can be also circulator, the present invention does not limit the particular type of coupling unit 4, these are only for example.
The workflow of the OTDR device based on multi-Wavelength Pulses light signal is as follows:
Data processing unit 1 is for modulation parameter and channel parameters are set, and transmission drives signal to Optical Transmit Unit 2 according to modulation parameter; Optical Transmit Unit 2 is according to driving signal modulate and launch corresponding multi-Wavelength Pulses light signal, and multi-Wavelength Pulses light signal enters testing fiber 5 after coupling unit 4 is coupled; Multi-Wavelength Pulses light signal is in the interior generation backscatter signals of testing fiber 5, backscatter signals through coupling unit 4 be coupled laggard enter light receiving unit 3; Light receiving unit 3 carries out opto-electronic conversion, amplification filtering and analog to digital conversion according to channel parameters successively to backscatter signals, obtains and detects data; Light receiving unit 3 sends to data processing unit 1 to analyze, process detection data.
In the present embodiment, what multi-Wavelength Pulses light signal adopted is the pulsed optical signals of 1550nm, 1310nm and tri-kinds of wavelength of 1625nm, these three kinds of wavelength are traditional OTDR and adopt, and can not bring extra cost and complexity, but be not limited to this, the present invention is not restricted the wavelength coverage of multi-Wavelength Pulses light signal, preferred wavelength coverage is 1210nm ~ 1650nm, and this wave band is conventional wave band in optical fiber communication, and loss factor is little, long transmission distance, is easy to realize.This wavelength coverage is only for reference, does not limit the wavelength coverage of multi-Wavelength Pulses light signal.
In the present embodiment, modulation parameter is as shown in table 1:
Table 1 modulation parameter
| Wavelength (nm) | Pulse width (ns) | Pulse strength (dBm) | Type of coding | Code length |
| 1310 | 1 | 20 | Bi-orthogonal coded | 64 |
| 1625 | 10 | 20 | Bi-orthogonal coded | 256 |
| 1550 | 100 | 20 | Bi-orthogonal coded | 1024 |
If light source 1, light source 2 and light source 3 respectively corresponding wavelength are the light source of 1310nm, 1550nm and 1625nm.Light source 1 ~ light source 3 pulse widths are respectively 1ns, 10ns, 100ns, and its range resolution is respectively 0.1m, 1m, 10m, and pulse strength is 20dBm.
Light source 1 ~ light source 3 centre wavelengths are respectively 1310nm, 1615nm, 1550nm.Three wavelength loss rates are respectively 0.35dB/km, 0.25dB/km, 0.2dB/km.1310nm proportion of goods damageds maximum, its rayleigh scattering coefficient the highest (cube of rayleigh scattering coefficient and wavelength is inversely proportional to), is therefore suitable for most surveying short distance scattered signal simultaneously.And 1550nm proportion of goods damageds minimum is suitable for surveying long range signals.In tradition OTDR for the 1625nm light source of on-line measurement, herein for measuring the signal of intermediate distance.
The driving signal of the present embodiment adopts bi-orthogonal coded (Biorthogonal codes), and this kind of coding realized convenient, superior performance, receives much concern.The pass of code length and gain is:
, the dynamic range of the longer increase of code length is larger, but can bring too much computing, in addition due to the imperfection of signal, code length increase also can cause the decrease resolution after demodulation, therefore for burst pulse high-resolution signal, should not select long code length.Light source to different pulse widths in table 1, the code length of selection is respectively 64,256,1024.The yield value that this coding brings is respectively 6dB, 9dB, 12dB.Except bi-orthogonal coded, other conventional coding is also applicable to this OTDR device as S code, Gray code (Golay codes) etc.
OTDR method based on multi-Wavelength Pulses light signal, for event on a testing fiber is detected, comprises the steps:
Step a sends one group of multi-Wavelength Pulses light signal to testing fiber simultaneously; Wherein, multi-Wavelength Pulses light signal refers to the pulsed optical signals that comprises at least two different centre wavelengths, and this multi-Wavelength Pulses light signal is through driving signal modulation.What in the present embodiment, multi-Wavelength Pulses light signal adopted is the pulsed optical signals of 1550nm, 1310nm and tri-kinds of wavelength of 1625nm.In the present embodiment, this driving signal is specially the bi-orthogonal coded of different length.Multi-Wavelength Pulses light also can be without driving signal modulation, and reason is set forth in to the description of OTDR device, does not repeat them here.
Step b gathers many groups backscatter signals of being returned by testing fiber simultaneously, obtains many groups and detects data.Collection to backscatter signals is specially:
Backscatter signals is carried out to light splitting, obtain the scattering sub-signal of some different-wavebands, then each road scattering sub-signal is carried out respectively to opto-electronic conversion, amplification filtering and analog to digital conversion, obtain some detection data.All can obtain one group of corresponding detection data to the collection of each road scattering sub-signal.
Step c, to the detection data analysis processing collecting, obtains optimum OTDR curve map and list of thing.The many groups of analyzing and processing that detect data are specially:
Step c1, event searching, to detecting data analysis, all events that exist in search optical fiber link, calculate event argument, obtain described list of thing.The acquisition methods of event argument is specially:
According to corresponding wavelength, priority is set by detecting data with reference to different event types, all parameters of all events, all by the highest detection extracting data of corresponding priority.
Different distance adopts different wave length to measure, can obtain optimum resolution and the maximum length of measuring, but in event argument, not only comprise one of resolution, the wavelength that obtains optimum resolution is not necessarily same best in the measurement of other parameter, as reflectivity and the proportion of goods damageds, the type identification etc. of event.The measurement result of Same Wavelength, can obtain optimum resolution and type identification in some distance segment, and in other distance segment, likely obtain best reflectivity or the proportion of goods damageds.Therefore, adopt the acquisition methods of above-mentioned event argument.For example, to the event of closely locating, its resolution is determined by pulse width, therefore locate its distance and will use the wavelength signals of minimum pulse width, and for its proportion of goods damageds, measuring accuracy is relevant with the dynamic range of this point, therefore should select the wavelength signals of this place's dynamic range maximum, and the pulse width of this wavelength signals is typically chosen in unsaturated maximum pulse.
Priority for data corresponding to the each wavelength of different event type is as shown in table 2, and wherein, 1 represents that priority is the highest.Consider in data than being easier to occur saturated phenomenon, saturated if the high data of priority have occurred at event location place, the data of selecting successively priority to take second place, until do not have saturated till.The signal to noise ratio (S/N ratio) that also will consider in addition event place, processing mode is identical with saturated phenomenon.
Table 2 is for the priority of data corresponding to the each wavelength of different event type
| ? | 1310nm | 1625nm | 1550nm |
| Reflectivity | 1 | 2 | 3 |
| The proportion of goods damageds | 3 | 2 | 1 |
| Resolution | 1 | 2 | 3 |
| Type identification | 1 | 2 | 3 |
Step c2, combines the signal data at testing fiber different distance place, generates optimum OTDR curve map according to the data after combination.Data combined method is specially:
Without event place, if signal to noise ratio (S/N ratio) is not less than a default threshold value, select minimum pulse wavelength signals;
There iing event place, selecting event type to identify best wavelength signals.
For OTDR curve map, owing to finally presenting to user's the curve that only has, therefore need the data at different distance place to combine.The signal showing should have optimum resolution and optimum signal-noise ratio, and the two is conflicting, and resolution height pulse width is less to such an extent as to signal to noise ratio (S/N ratio) is corresponding lower.Therefore, adopt above-mentioned data combined method, this is because some wavelength signals is insensitive to event type, for example, for the compound event of width 5m, if what use when signal shows is 100ns pulse wavelength signals (pulsewidth 10m), whether be compound event, user's use is caused to misleading if on curve, cannot differentiate.After above-mentioned optimization is selected, can generate optimum OTDR curve map.
In the present embodiment, driving signal is pulse code, before step c, also comprises data decode step, is specially:
Adopt the inverse matrix corresponding with pulse code to detect data to each group that collects and carry out respectively data decode, and storage.
In the present embodiment, owing to driving signal to adopt bi-orthogonal coded, therefore need to adopt inverse matrix corresponding to bi-orthogonal codes to decode.Drive signal to adopt different codings to use different decoding algorithms.Drive signal if do not adopt or drive signal not adopt pulse code need not carry out decoding step.
Principle of work of the present invention is as follows:
The present invention, by send many group wavelength differences, pulsed optical signals that modulation parameter is different simultaneously, receives its backscatter signals, obtains the event information of whole piece optical fiber link.Modulation parameter comprises the parameters such as pulse width, pulse strength, type of coding, code length, for using narrow pulse width and short code length compared with short distance optical fiber, can obtain high range resolution, for use broad pulse width and long pulse coding compared with long-distance optical fiber, can obtain great dynamic range, under different parameters coordinates, can obtain the optimum measurement result of different fiber section.In addition, multi-wavelength is measured simultaneously only needs single acquisition just can obtain the data under many group parameters, has greatly saved Measuring Time.Due to each data that comprise multiple wavelength of measuring, event argument can compare and choose optimal value in measurement result, and signal curve also can be chosen optimal value and combines and show from measurement result, has improved measurement effect.
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 (23)
1. the OTDR device based on multi-Wavelength Pulses light signal, for event on a testing fiber is detected, this OTDR device comprises data processing unit, Optical Transmit Unit and light receiving unit, and described data processing unit is connected with described light receiving unit, it is characterized in that
Described Optical Transmit Unit is for send one group of multi-Wavelength Pulses light signal to described testing fiber simultaneously, and described Optical Transmit Unit comprises the light source of light compositing module and at least two different centre wavelengths;
Described light receiving unit, for gather many groups backscatter signals of being returned by described testing fiber simultaneously, obtains detection data; Described light receiving unit comprises spectral module and at least two light detection modules corresponding to described different centre wavelength light sources;
The detection data analysis processing of described data processing unit for described light receiving unit is collected.
2. the OTDR device based on multi-Wavelength Pulses light signal according to claim 1, is characterized in that, described Optical Transmit Unit also comprises light source driver module, and described light source driver module is for driving the light source of described different centre wavelengths.
3. the OTDR device based on multi-Wavelength Pulses light signal according to claim 2, it is characterized in that, described data processing unit is also connected with described Optical Transmit Unit, described data processing unit is used for arranging modulation parameter, and sends and drive signal to control described light source driver module according to described modulation parameter.
4. the OTDR device based on multi-Wavelength Pulses light signal according to claim 3, is characterized in that, described modulation parameter comprises the pulse strength, pulse width, type of coding and the code length that drive signal.
5. the OTDR device based on multi-Wavelength Pulses light signal according to claim 1 and 2, it is characterized in that, described light receiving unit also comprises amplification filtering module and analog-to-digital conversion module, described smooth detection module outputs signal to described amplification filtering module, and described amplification filtering module output signal is to described analog-to-digital conversion module.
6. the OTDR device based on multi-Wavelength Pulses light signal according to claim 5, is characterized in that, described amplification filtering module comprises some amplification filtering passages, each amplification filtering passage and a corresponding connection of described smooth detection module; Described analog-to-digital conversion module comprises some analog to digital conversion passages, each analog to digital conversion passage and a corresponding connection of described amplification filtering passage.
7. the OTDR device based on multi-Wavelength Pulses light signal according to claim 6, it is characterized in that, described data processing unit is used for arranging channel parameters, and described smooth detection module, described amplification filtering module and described analog-to-digital conversion module are controlled.
8. the OTDR device based on multi-Wavelength Pulses light signal according to claim 7, is characterized in that, described channel parameters comprises photo-detection voltage, gain amplifier parameter, bandwidth parameter and offset parameter.
9. the OTDR device based on multi-Wavelength Pulses 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 Optical Transmit Unit and described light receiving unit respectively, and the other end of described coupling unit is connected with described testing fiber.
10. the OTDR device based on multi-Wavelength Pulses light signal according to claim 1, is characterized in that, the wavelength coverage of described multi-Wavelength Pulses light signal is 1210nm ~ 1650nm.
The 11. OTDR devices based on multi-Wavelength Pulses light signal according to claim 1, is characterized in that, described light compositing module is directional coupler, wavelength division multiplexer or planar optical waveguide.
The 12. OTDR devices based on multi-Wavelength Pulses light signal according to claim 1, is characterized in that, described smooth detection module is APD photodiode.
The 13. OTDR devices based on multi-Wavelength Pulses light signal according to claim 3, is characterized in that the pulse code that described driving signal is pseudo-random sequence.
The 14. OTDR devices based on multi-Wavelength Pulses light signal according to claim 13, is characterized in that, described pulse code adopts Gray code, S code or bi-orthogonal coded.
The 15. OTDR devices based on multi-Wavelength Pulses light signal according to claim 9, is characterized in that, described coupling unit is bidirectional coupler or circulator.
16. OTDR methods based on multi-Wavelength Pulses light signal, for event on a testing fiber is detected, is characterized in that, comprise the steps:
Step a sends one group of multi-Wavelength Pulses light signal to described testing fiber simultaneously; Wherein, described multi-Wavelength Pulses light signal refers to the pulsed optical signals that comprises at least two different centre wavelengths;
Step b gathers many groups backscatter signals of being returned by described testing fiber simultaneously, obtains many groups and detects data;
Step c, to the detection data analysis processing collecting, obtains optimum OTDR curve map and list of thing.
The 17. OTDR methods based on multi-Wavelength Pulses light signal according to claim 16, is characterized in that, described multi-Wavelength Pulses light signal is through driving signal modulation.
The 18. OTDR methods based on multi-Wavelength Pulses light signal according to claim 17, is characterized in that pulse code or single pulse signal that described driving signal is pseudo-random sequence.
The 19. OTDR methods based on multi-Wavelength Pulses light signal according to claim 16, is characterized in that, the collection to backscatter signals in described step b is specially:
Described backscatter signals is carried out to light splitting, obtain the scattering sub-signal of some different-wavebands, then scattering sub-signal described in each road is carried out respectively to opto-electronic conversion, amplification filtering and analog to digital conversion, obtain some detection data.
The 20. OTDR methods based on multi-Wavelength Pulses light signal according to claim 16, is characterized in that, in described step c, the many groups of analyzing and processing that detect data are specially:
Step c1, event searching, to detecting data analysis, all events that exist in search optical fiber link, calculate event argument, obtain described list of thing;
Step c2, combines the signal data at testing fiber different distance place, generates optimum OTDR curve map according to the data after combination.
The 21. OTDR methods based on multi-Wavelength Pulses light signal according to claim 20, is characterized in that, the acquisition methods of the event argument in described step c1 is specially:
With reference to different event types, described detection data are arranged to priority according to corresponding wavelength, all parameters of all events, all by the highest detection extracting data of corresponding priority.
The 22. OTDR methods based on multi-Wavelength Pulses light signal according to claim 20, is characterized in that, the data combined method in described step c2 is specially:
Without event place, if signal to noise ratio (S/N ratio) is not less than a default threshold value, select minimum pulse wavelength signals;
There iing event place, selecting event type to identify best wavelength signals.
The 23. OTDR methods based on multi-Wavelength Pulses light signal according to claim 18, is characterized in that, before described step c, also comprise data decode step, are specially:
Adopt the inverse matrix corresponding with described pulse code to detect data to each group that collects and carry out respectively data decode, and storage.
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