CN103808339B - 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 based on multi-Wavelength Pulses optical signal
OTDR device and method.
Background technology
The principle of optical time domain reflectometer (Optical Time-Domain Reflectometry, OTDR) is: pulsed light exists
During fiber-optic transfer, produce backscattering and reflection due to character, adapter, joint, bending or other event of optical fiber itself,
This scattering and reflection light return to initial end, and are received by photoelectric device.Scattered light mainly includes being changed by optical fibre refractivity
The Brillouin scattering that Raman scattering that the Rayleigh scattering that causes, optical phonon cause, acoustical phonon cause, comprises in scattered signal
The information such as optical fiber loss on the way, temperature, stress.Utilize OTDR can carry out non-destructive survey from one end to optical fiber easily
Amount, can show apart from upper various events whole fibre circuit.Along with the technology such as fiber optic communication, Fibre Optical Sensor
Development, this technology has obtained great application and propelling, however as the raising to spatial resolution with measurement required distance,
OTDR system becomes increasingly complex, and the time of measuring is more and more longer, and traditional method has been difficult to improve further the performance of OTDR.
In order to improve the dynamic range of OTDR, conventionally used two kinds of methods: increase pulse width, increase accumulation interval.
Owing to accumulation interval can not unrestrictedly increase, increase the selection that pulse width has just become main, but the increase of pulse width causes
Spatial resolution reduces so that test performance is difficult to meet the requirements.Such as [CN 1330265A], this patent only address only big dynamic
State range problem, does not solve the too low problem of resolution, and measurement process needs to expend the more times time.Public at Tektronix
The continuous acquisition scheme proposed in the patent [US 5155439A] of department proposes the new method solving the problems referred to above, is adopting continuously
In collection scheme, gather for the first time and use minimum pulse, gather thereafter the pulse width used every time and be gradually increased, until measuring
Signal in occur in that optical fiber connector just stop measure.The event information obtained from different acquisition is incorporated into same result
In, generate single OTDR curve chart or list of thing.So for each section of optical fiber, suitable space can be obtained and divide
Resolution, and measure distance and have also been obtained guarantee, but also avoid the saturation problem that Larger Dynamic scope causes.Although spatial discrimination
The scheme that the contradiction of rate and dynamic range is described above can partly have been resolved, but cost is to increase the measurement time
Add, complete in even cannot being guaranteed in the specific time to measure.For the measurement of Larger Dynamic scope, in order to ensure the noise of end
Ratio, once gather the time to be expended reach one minute the most longer, if carried out multi collect, and the number of times of collection does not has
Limiting, its measurement time will be difficult to meet user's request, limit its application and development.
Summary of the invention
In order to overcome defect present in prior art, the present invention provides that a kind of testing time is short, the base of good test effect
In the OTDR device and method of multi-Wavelength Pulses optical signal, concrete technical scheme is as follows:
OTDR device based on multi-Wavelength Pulses optical signal, for event on a testing fiber is detected,
This OTDR device includes data processing unit, Optical Transmit Unit and light receiving unit, data processing unit and light receiving unit
Connect；
Optical Transmit Unit is for sending one group of multi-Wavelength Pulses optical signal to testing fiber simultaneously, and Optical Transmit Unit includes light
The light source of synthesis module centre wavelength different with at least two；
Light receiving unit, for gathering the many groups backscatter signals returned by testing fiber simultaneously, obtains detection data；
Light receiving unit includes spectral module and at least two light detection module corresponding to different centre wavelength light sources；
Data processing unit is analyzed processing for the detection data collecting light receiving unit.
As prioritization scheme, Optical Transmit Unit also includes light source driver module, and light source driver module is used for driving in difference
The light source of cardiac wave length.
As prioritization scheme, data processing unit is also connected with Optical Transmit Unit, and data processing unit is used for arranging modulation
Parameter, and drive signal that light source driver module is controlled according to modulation parameter transmission.
As prioritization scheme, modulation parameter includes driving the pulse strength of signal, pulse width, type of coding and coding long
Degree.
As prioritization scheme, light receiving unit also includes amplifying filtration module and analog-to-digital conversion module, and light detection module is defeated
Go out signal to amplifying filtration module, amplify filtration module and output signal to analog-to-digital conversion module.
As prioritization scheme, amplify filtration module and include some amplification filtering channels, each amplification filtering channel and one
Light detection module correspondence connects；Analog-to-digital conversion module includes some analog digital conversion passages, and each analog digital conversion passage and one are put
Big filtering channel correspondence connects.
As prioritization scheme, data processing unit is used for arranging channel parameters, to light detection module, amplify filtration module with
And analog-to-digital conversion module is controlled.
As prioritization scheme, channel parameters includes photo-detection voltage, gain amplifier parameter, bandwidth parameter and offset parameter.
As prioritization scheme, also include coupling unit, one end of coupling unit respectively with Optical Transmit Unit and light-receiving list
Unit connects, and the other end of coupling unit is connected with testing fiber.
As prioritization scheme, the wave-length coverage of multi-Wavelength Pulses optical 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, pulse code or the single pulse signal driving signal to be pseudo-random sequence.
As prioritization scheme, pulse code uses 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 optical signal, for event on a testing fiber is detected,
Comprise the steps:
Step a, sends one group of multi-Wavelength Pulses optical signal to testing fiber simultaneously；Wherein, multi-Wavelength Pulses optical signal is
Refer to include the pulsed optical signals of at least two difference centre wavelength；
Step b, gathers the many groups backscatter signals returned by testing fiber simultaneously, obtains many group detection data；
The detection data collected are analyzed processing, it is thus achieved that optimum OTDR curve chart and list of thing by step c.
As prioritization scheme, multi-Wavelength Pulses optical signal is through driving signal modulation.
As prioritization scheme, driving signal is the pulse code of pseudo-random sequence.
As prioritization scheme, in step b to the collection of backscatter signals particularly as follows:
Backscatter signals is carried out light splitting, it is thus achieved that the scattering sub-signal of some different-wavebands, then to the scattering point of each road
Signal carries out opto-electronic conversion respectively, amplifies filtering and analog digital conversion, it is thus achieved that some detection data.
As prioritization scheme, in step c to the analyzing and processing of many group detection data particularly as follows:
Step c1, event searching, detection data are analyzed, all events present in search optical fiber link, calculate
Event argument, it is thus achieved that list of thing；
Step c2, is combined the signal data at testing fiber different distance, according to the data genaration after combination
Excellent OTDR curve chart.
As prioritization scheme, event searching method in step c1 particularly as follows:
With reference to different event types, detection data are arranged priority according to corresponding wavelength, all ginsengs of all events
Number, the detection extracting data that all corresponding priority is the highest.
As prioritization scheme, data combined method in step c2 particularly as follows:
At without event, if signal to noise ratio is not less than a threshold value preset, then select minimum pulse wavelength signals；
Having at event, selecting the wavelength signals optimal to event type identification.
As prioritization scheme, if driving signal is pulse code, before step c, also include data decoding step, particularly as follows:
Use the inverse matrix corresponding with pulse code that each group detection data collected are carried out data decoding respectively, and deposit
Storage.
Compared with prior art, the method have the advantages that
(1) relative to traditional OTDR, present invention pulsed optical signals based on multi-wavelength, can be with simple realization Larger Dynamic model
Enclose test, measured the different distance of optical fiber by different wave length, the shape that Single wavelength pulse is saturated or signal to noise ratio is too low can be avoided
State；
(2) gathering OTDR or continuous acquisition OTDR relative to, it is (resolution, dynamic that the present invention has higher test performance more
State scope), and saved the measurement time, such as, use dual wavelength OTDR can save for about 1/2 time, three wavelength can be saved
About 2/3 time；
(3) in the present invention, owing to the measurement between each wavelength is independently to carry out, test device can be at different conditions
Lower operation, it is achieved multifunctional testing；Such as, some wave band is in on-line testing, and some wave band is in common test；Or surveying
Separate a certain wave band during examination and carry out test or the analysis of other Fiber-optic parameter (such as fiber lengths, vibration, temperature etc.)；Will
Greatly enrich OTDR function.
Accompanying drawing explanation
Fig. 1 is the 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.
Serial number in upper figure: 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-amplify filtration module, 34-analog digital conversion
Module, 4-coupling unit, 5-testing fiber.
Detailed description of the invention
Describe the present invention the most by way of example in detail.
Embodiment 1:
As it is shown in figure 1, OTDR device based on multi-Wavelength Pulses optical signal, for a testing fiber 5 is detected, should
OTDR device includes data processing unit 1, Optical Transmit Unit 2, light receiving unit 3 and coupling unit 4.
As in figure 2 it is shown, Optical Transmit Unit 2 is for sending one group of multi-Wavelength Pulses optical signal to testing fiber simultaneously, light is sent out
Penetrate unit 2 and include the light source 22 of light compositing module 23 centre wavelength different with at least two.Light compositing module 23 is for multiple
The pulsed light of the different wave length that light source 22 is launched couples.In the present embodiment, light compositing module 23 is directional coupler, i.e.
The fiber coupler of one-way communication, but it is not limited to this, it is also possible to use wavelength division multiplexer (WDM) or planar optical waveguide (PLC), this
The particular type of light compositing module 23 is not defined by invention, these are only citing.
In the present embodiment, Optical Transmit Unit 2 also includes light source driver module 21, and light source driver module 21 is for driving not
The light source 22 of concentricity wavelength.The present invention is not limited to use this light source driver module 21, only with multi-Wavelength Pulses
Optical signal can realize saving the measurement time, improving the technique effect testing effect.In the present embodiment, light source driver module 21
Driving including some light sources, each light source drives a corresponding light source 22, sees Fig. 2, but is not limited to this, it is also possible to a light source drives
Dynamic corresponding multiple light sources 22, as long as light source drives disclosure satisfy that the wave band needed for all light sources 22.
Accordingly, data processing unit 1 can be used for arranging modulation parameter, is controlled light source driver module 21, i.e. root
Send corresponding driving signal according to the modulation parameter arranged and control light source driver module 21, multi-Wavelength Pulses optical signal is adjusted
System.In the present embodiment, pulse code or the single pulse signal driving signal to be pseudo-random sequence；Wherein, pulse code is permissible
Use Gray code, S code or bi-orthogonal coded.This pulse code can improve the signal to noise ratio of multi-Wavelength Pulses optical signal, increases dynamic
State scope, saves the measurement time, again improves the performance of OTDR on the basis of multi-Wavelength Pulses optical signal.Wherein, modulation
Parameter includes driving the pulse strength of signal, pulse width, type of coding and code length.
As it is shown on figure 3, light receiving unit 3 is for gathering the many groups backscatter signals returned by testing fiber simultaneously, obtain
Take detection data；The light detection module 32 of different centre wavelength light sources is corresponded to including spectral module 31 and at least two；At this
In embodiment, light detection module 32 is APD photodiode.
In the present embodiment, light receiving unit 3 also includes amplifying filtration module 33 and analog-to-digital conversion module 34, light detection mould
Block 32 outputs signal to amplify filtration module 33, amplifies filtration module 33 and outputs signal to analog-to-digital conversion module 34.Wherein, amplify
Filtration module 33 includes some amplification filtering channels, each amplification filtering channel and a corresponding connection of light detection module；Modulus
Modular converter 34 includes that some analog digital conversion passages, each analog digital conversion passage amplify the corresponding connection of filtering channel with one.?
In the present embodiment, a light detection module constitutes one with corresponding amplification filtering channel and corresponding analog digital conversion passage
Light-receiving passage, it is believed that contain several light-receiving passages in light receiving unit 3, by these light-receiving passages
It is controlled can each road backscatter signals being processed accordingly, thus the detection data needed for obtaining.Can pass through
Arrange channel parameters to realize these light-receiving passages are controlled.
Accordingly, data processing unit 1 can be used for arranging channel parameters, to light detection module 32, amplifies filtration module 33
And analog-to-digital conversion module 34 is controlled, i.e. by arrange channel parameters control opto-electronic conversion, amplify filtering and modulus turn
The process changed detection data needed for obtaining.Wherein, channel parameters includes that photo-detection voltage, gain amplifier parameter, bandwidth are joined
Number and offset parameter.Wherein, photo-detection voltage corresponds to light detection module 32, gain amplifier parameter and bandwidth parameter corresponding to putting
Big filtration module 33, offset parameter corresponding to the bias current in light detection module 32, and amplify in filtration module 33 inclined
Put voltage.It should be noted that channel parameters is far above in these, the kind of channel parameters is not restricted by the present invention.
Data processing unit 1 is analyzed processing for the detection data collecting light receiving unit 3.
One end of coupling unit 4 is connected with Optical Transmit Unit 2 and light receiving unit 3 respectively, the other end of coupling unit 4 with
Testing fiber 5 connects.In the present embodiment, coupling unit 4 is the fiber coupler of bidirectional coupler, i.e. two-way communication, but not
Being limited to this, it is also possible to be circulator, the particular type of coupling unit 4 is not defined by the present invention, these are only citing.
The workflow of OTDR device based on multi-Wavelength Pulses optical signal is as follows:
Data processing unit 1 is used for arranging modulation parameter and channel parameters, and sends driving signal according to modulation parameter
To Optical Transmit Unit 2；Optical Transmit Unit 2 is according to driving signal to be modulated and launch corresponding multi-Wavelength Pulses optical signal, many
The coupled unit of wavelength pulse optical signal 4 enters testing fiber 5 after coupling；Multi-Wavelength Pulses optical signal is at testing fiber 5
Interior generation backscatter signals, the coupled unit of backscatter signals 4 enters light receiving unit 3 after coupling；Light-receiving list
Unit 3 carries out opto-electronic conversion according to channel parameters successively to backscatter signals, amplification filters and analog digital conversion, it is thus achieved that detection number
According to；Detection data are sent to data processing unit 1 and are analyzed, process by light receiving unit 3.
In the present embodiment, multi-Wavelength Pulses optical signal uses tri-kinds of wavelength of 1550nm, 1310nm and 1625nm
Pulsed optical signals, these three wavelength is tradition OTDR and is used, will not bring extra cost and complexity, but be not limited to
This, the wave-length coverage of multi-Wavelength Pulses optical signal is not restricted by the present invention, and preferred wave-length coverage is 1210nm ~ 1650nm,
This wave band is conventional wave band in fiber optic communication, and loss factor is little, long transmission distance, it is easy to accomplish.This wave-length coverage is intended for ginseng
Examine, be not limiting as the wave-length coverage of multi-Wavelength Pulses optical 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 corresponding wavelength respectively are the light source of 1310nm, 1550nm and 1625nm.Light source 1 ~
Light source 3 pulse width is respectively 1ns, 10ns, 100ns, and its range resolution ratio is respectively 0.1m, 1m, 10m, and pulse strength is
20dBm。
Light source 1 ~ light source 3 centre wavelength is respectively 1310nm, 1615nm, 1550nm.Three wavelength loss rates are respectively
0.35dB/km、0.25dB/km、0.2dB/km.The 1310nm proportion of goods damageds are maximum, and the highest (Rayleigh dissipates its rayleigh scattering coefficient simultaneously
The cube penetrating coefficient and wavelength is inversely proportional to), therefore it is best suitable for for detecting short distance scattered signal.And the 1550nm proportion of goods damageds are
Little, it is suitable for detecting long range signals.For the 1625nm light source of on-line measurement in tradition OTDR, it is used for measuring centre herein
The signal of distance.
The driving signal of the present embodiment uses bi-orthogonal coded (Biorthogonal codes), this kind of coding realization side
Just, superior performance, receive much concern.Code length with the relation of gain is:, coding is long
The dynamic range spending the longest increase is the biggest, but can bring too much computing, and additionally, due to the imperfection of signal, code length increases
Add the resolution reduction also resulted in after demodulation, therefore for burst pulse high-resolution signal, should not select long coding
Length.Light source to different pulse widths in table 1, the code length of selection is respectively 64,256,1024.The increasing that this coding brings
Benefit value is respectively 6dB, 9dB, 12dB.In addition to bi-orthogonal coded, other conventional coding such as S code, Gray code (Golay
Etc. codes) it is also applied for this OTDR device.
OTDR method based on multi-Wavelength Pulses optical signal, for event on a testing fiber is detected,
Comprise the steps:
Step a, sends one group of multi-Wavelength Pulses optical signal to testing fiber simultaneously；Wherein, multi-Wavelength Pulses optical signal is
Refer to include the pulsed optical signals of at least two difference centre wavelength, and this multi-Wavelength Pulses optical signal is through driving signal modulation.?
In the present embodiment, multi-Wavelength Pulses optical signal uses the pulsed optical signals of tri-kinds of wavelength of 1550nm, 1310nm and 1625nm.
In the present embodiment, this driving signal is specially the bi-orthogonal coded of different length.Multi-Wavelength Pulses light can also be without driving
Signal is modulated, and reason illustrates in the description to OTDR device, does not repeats them here.
Step b, gathers the many groups backscatter signals returned by testing fiber simultaneously, obtains many group detection data.To the back of the body
To the collection of scattered signal particularly as follows:
Backscatter signals is carried out light splitting, it is thus achieved that the scattering sub-signal of some different-wavebands, then to the scattering point of each road
Signal carries out opto-electronic conversion respectively, amplifies filtering and analog digital conversion, it is thus achieved that some detection data.Each road is scattered sub-signal
Collection all can obtain one group of corresponding detection data.
The detection data collected are analyzed processing, it is thus achieved that optimum OTDR curve chart and list of thing by step c.
To the analyzing and processing of many group detection data particularly as follows:
Step c1, event searching, detection data are analyzed, all events present in search optical fiber link, calculate
Event argument, it is thus achieved that described list of thing.The acquisition methods of event argument particularly as follows:
With reference to different event types, detection data are arranged priority according to corresponding wavelength, all ginsengs of all events
Number, all by the detection extracting data that corresponding priority is the highest.
Different distance uses different wave length to measure, available optimum resolution and maximum length of measuring, but event
Parameter not only comprises resolution one, it is thus achieved that the wavelength of optimum resolution in the measurement of other parameter
Good, such as reflectance and the proportion of goods damageds, the type identification etc. of event.The measurement result of Same Wavelength, can obtain in some distance segment
Optimum resolution and type identification, and in other distance segment, it is likely that obtain optimal reflectance or the proportion of goods damageds.Therefore,
Use the acquisition methods of above-mentioned event argument.Such as, to the event closely located, its resolution is determined by pulse width, therefore
Position its distance and will use the wavelength signals of minimum pulse width, and for its proportion of goods damageds, then dynamic with this point of measuring accuracy
Scope is relevant, therefore should select the wavelength signals that at this, dynamic range is maximum, and the pulse width of this wavelength signals is typically chosen in
Unsaturated maximum pulse.
The priority of the data that wavelength each for different event type is corresponding is as shown in table 2, and wherein, 1 represents that priority is
High.In view of data being easier saturated phenomenon occurs, if the high data of priority there occurs saturated, then at event location
Select the data taken second place of priority successively, until do not have saturated till.Additionally it is also contemplated that the signal to noise ratio at event, process side
Formula is identical with saturated phenomenon.
The priority of the data that table 2 wavelength each for different event type is corresponding
| 1310nm | 1625nm | 1550nm | |
| Reflectance | 1 | 2 | 3 |
| The proportion of goods damageds | 3 | 2 | 1 |
| Resolution | 1 | 2 | 3 |
| Type identification | 1 | 2 | 3 |
Step c2, is combined the signal data at testing fiber different distance, according to the data genaration after combination
Excellent OTDR curve chart.Data combined method particularly as follows:
At without event, if signal to noise ratio is not less than a threshold value preset, then select minimum pulse wavelength signals；
Having at event, selecting the wavelength signals optimal to event type identification.
For OTDR curve chart, owing to finally be presented to an only curve of user, it is therefore desirable at different distance
Data be combined.The signal shown should have optimum resolution and optimum signal-noise ratio, and both is mutual lance
Shield, resolution height then pulse width is less to such an extent as to signal to noise ratio is the most relatively low.Therefore, use above-mentioned data combined method, this
It is owing to some wavelength signals is insensitive to event type, such as the compound event of width 5m, if using during signal display
Be 100ns pulse wavelength signals (pulsewidth 10m), whether be compound event, the use to user is made if curve will be unable to differentiate
Become to mislead.After above-mentioned optimized choice, the OTDR curve chart of optimum can be generated.
In the present embodiment, driving signal is pulse code, also includes data decoding step before step c, particularly as follows:
Use the inverse matrix corresponding with pulse code that each group detection data collected are carried out data decoding respectively, and deposit
Storage.
In the present embodiment, owing to driving signal to use bi-orthogonal coded, it is therefore desirable to use corresponding inverse of bi-orthogonal codes
Battle array is decoded.Signal is driven to use different codings will to use different decoding algorithms.If not using driving signal or driving
Signal does not use pulse code then need not be decoded step.
The operation principle of the present invention is as follows:
The present invention, by sending the pulsed optical signals that many group wavelength are different, modulation parameter is different simultaneously, receives it and dissipates dorsad
Penetrate signal, obtain the event information of whole piece optical fiber link.Modulation parameter includes pulse width, pulse strength, type of coding, coding
The parameters such as length, use narrow pulse width and short code length for relatively short distance optical fiber, can obtain high range resolution ratio,
Broad pulse width and long pulse coding are used for relatively long distance optical fiber, it is possible to obtain dynamic range greatly, different parameters is joined
Under conjunction, it is possible to obtain the optimum measurement result of different fiber segment.It addition, multi-wavelength is measured and is had only to single acquisition and just may be used simultaneously
To obtain the data under many group parameters, greatly save the measurement time.Owing to measuring the data comprising multiple wavelength, thing every time
Part parameter can compare and choose optimal value in the measurement results, and signal curve also can be chosen optimal value from measurement result and enter
Row combination and display, improve measurement effect.
The several specific embodiments being only the application disclosed above, but the application is not limited to this any this area
What technical staff can think change, all should fall in the protection domain of the application.
Claims (19)
1. OTDR device based on multi-Wavelength Pulses optical signal, for event on a testing fiber is detected, should
OTDR device includes that data processing unit, Optical Transmit Unit and light receiving unit, described data processing unit connect with described light
Receipts unit connects, it is characterised in that
Described Optical Transmit Unit is for sending one group of multi-Wavelength Pulses optical signal, described light emission list to described testing fiber simultaneously
Unit includes the light source of light compositing module centre wavelength different with at least two；
Described light receiving unit, for gathering the many groups backscatter signals returned by described testing fiber simultaneously, obtains detection number
According to；Described light receiving unit includes spectral module and at least two light detection mould corresponding to described different centre wavelength light sources
Block；
Described data processing unit is analyzed processing for the detection data collecting described light receiving unit；By difference
Wavelength pulse optical signal measures the different distance of optical fiber, and the measurement between each wavelength pulse optical signal is independently carried out；
Described Optical Transmit Unit also includes that light source driver module, described light source driver module are used for driving described different centre wavelength
Light source；
The signal that drives being modulated multi-Wavelength Pulses optical signal is the pulse code of pseudo-random sequence.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 1, it is characterised in that at described data
Reason unit is also connected with described Optical Transmit Unit, and described data processing unit is used for arranging modulation parameter, and according to described modulation
Parameter sends and drives signal to be controlled described light source driver module.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 2, it is characterised in that described modulation is joined
Number includes driving the pulse strength of signal, pulse width, type of coding and code length.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 1, it is characterised in that described light-receiving
Unit also includes amplifying filtration module and analog-to-digital conversion module, and described smooth detection module outputs signal to described amplification and filters mould
Block, described amplification filtration module outputs signal to described analog-to-digital conversion module.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 4, it is characterised in that described amplification is filtered
Mode block includes some amplification filtering channels, and each amplification filtering channel smooth detection module described with is corresponding to be connected；Described
Analog-to-digital conversion module includes some analog digital conversion passages, and each analog digital conversion passage is corresponding even with a described amplification filtering channel
Connect.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 5, it is characterised in that at described data
Reason unit is used for arranging channel parameters, to described smooth detection module, described amplification filtration module and described analog-to-digital conversion module
It is controlled.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 6, it is characterised in that described passage is joined
Number includes photo-detection voltage, gain amplifier parameter, bandwidth parameter and offset parameter.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 1, it is characterised in that also include coupling
Unit, one end of described coupling unit is connected with described Optical Transmit Unit and described light receiving unit respectively, described coupling unit
The other end be connected with described testing fiber.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 1, it is characterised in that described multi-wavelength
The wave-length coverage of pulsed optical signals is 1210nm～1650nm.
OTDR device based on multi-Wavelength Pulses optical signal the most according to claim 1, it is characterised in that described photosynthetic
One-tenth module is directional coupler, wavelength division multiplexer or planar optical waveguide.
11. OTDR devices based on multi-Wavelength Pulses optical signal according to claim 1, it is characterised in that described light is examined
Surveying module is APD photodiode.
12. OTDR devices based on multi-Wavelength Pulses optical signal according to claim 1, it is characterised in that described pulse
Coding uses Gray code, S code or bi-orthogonal coded.
13. OTDR devices based on multi-Wavelength Pulses optical signal according to claim 8, it is characterised in that described coupling
Unit is bidirectional coupler or circulator.
14. OTDR methods based on multi-Wavelength Pulses optical signal, for event on a testing fiber is detected, its
It is characterised by, comprises the steps:
Step a, sends one group of multi-Wavelength Pulses optical signal to described testing fiber simultaneously；Wherein, described multi-Wavelength Pulses light letter
Number refer to the pulsed optical signals of at least two difference centre wavelength；
Step b, gathers the many groups backscatter signals returned by described testing fiber simultaneously, obtains many group detection data；Pass through
Different wave length pulsed optical signals measures the different distance of optical fiber, and the measurement between each wavelength pulse optical signal is independently to carry out；
The detection data collected are analyzed processing, it is thus achieved that optimum OTDR curve chart and list of thing by step c；
Described multi-Wavelength Pulses optical signal is through driving signal modulation；
Described driving signal is pulse code or the single pulse signal of pseudo-random sequence.
15. OTDR methods based on multi-Wavelength Pulses optical signal according to claim 14, it is characterised in that described step
In b to the collection of backscatter signals particularly as follows:
Described backscatter signals is carried out light splitting, it is thus achieved that the scattering sub-signal of some different-wavebands, then dissipate described in each road
Penetrate sub-signal to carry out opto-electronic conversion respectively, amplify filtering and analog digital conversion, it is thus achieved that some detection data.
16. OTDR methods based on multi-Wavelength Pulses optical signal according to claim 14, it is characterised in that described step
In c to the analyzing and processing of many group detection data particularly as follows:
Step c1, event searching, detection data are analyzed, all events present in search optical fiber link, calculate event
Parameter, it is thus achieved that described list of thing；
Step c2, is combined the signal data at testing fiber different distance, according to the data genaration optimum after combination
OTDR curve chart.
17. OTDR methods based on multi-Wavelength Pulses optical signal according to claim 16, it is characterised in that described step
The acquisition methods of the event argument in c1 particularly as follows:
With reference to different event types, described detection data are arranged priority according to corresponding wavelength, all ginsengs of all events
Number, all by the detection extracting data that corresponding priority is the highest.
18. OTDR methods based on multi-Wavelength Pulses optical signal according to claim 16, it is characterised in that described step
Data combined method in c2 particularly as follows:
At without event, if signal to noise ratio is not less than a threshold value preset, then select minimum pulse wavelength signals；
Having at event, selecting the wavelength signals optimal to event type identification.
19. OTDR methods based on multi-Wavelength Pulses optical signal according to claim 14, it is characterised in that described step
Data decoding step is also included before c, particularly as follows:
Use the inverse matrix corresponding with described pulse code that each group detection data collected are carried out data decoding respectively, and deposit
Storage.
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| CN111817777A (en) * | 2020-07-23 | 2020-10-23 | 广州优加智联技术有限公司 | Idle optical fiber resource on-line monitoring system |
| CN112051031B (en) * | 2020-08-25 | 2022-07-19 | 中电科思仪科技股份有限公司 | Ultra-large dynamic range optical fiber loss distribution testing device and testing method |
| JP2022167095A (en) * | 2021-04-22 | 2022-11-04 | 横河電機株式会社 | optical pulse tester |
| CN115065404A (en) * | 2022-06-30 | 2022-09-16 | 青岛诺克通信技术有限公司 | Optical time domain reflectometer and link analysis method |
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