CN108507981A - Silica-based waveguides back reflection sensing device based on OFDR and its measurement method - Google Patents
Silica-based waveguides back reflection sensing device based on OFDR and its measurement method Download PDFInfo
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- CN108507981A CN108507981A CN201810321250.3A CN201810321250A CN108507981A CN 108507981 A CN108507981 A CN 108507981A CN 201810321250 A CN201810321250 A CN 201810321250A CN 108507981 A CN108507981 A CN 108507981A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
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Abstract
The invention discloses a kind of silica-based waveguides back reflection sensing device and its measurement method based on OFDR.Device includes tunable laser, triggering interferometer, optical fiber circulator, Polarization Control and beam splitting module, stellar interferometer, couples sensing module, high speed acquisition module and computer.Tunable laser sends out sweeping laser, and Polarization Control controls the polarization state of sweeping laser with beam splitting module and by its beam splitting, first via light enters triggering interferometer and generates the first beat signal as external clock；Second road light enters the inclined stellar interferometer of all risk insurance, third road light generates back reflection signal light by optical fiber circulator with sensing module is coupled, back reflection signal light and the second tunnel interference of light generate the second beat signal, and high speed acquisition module and the second beat signal of computer pair are demodulated and obtain location information.The present invention can accurately measure the propagation quality of the beam section length and light beam of silica-based waveguides in silica-based waveguides by fast, easily non-intrusion measurement.
Description
Technical field
The present invention relates to distributing optical fiber sensings and system detectio instrument technical field.More particularly to a kind of based on OFDR's
Silica-based waveguides back reflection sensing device and its measurement method.
Background technology
Using silica-based waveguides as the invention and application of the on piece silicon-based optical device of core, the life of the mankind is changed revolutionaryly
It is living.The prices of raw materials of silica-based waveguides are cheap, window material of the silicon as high-index material and communication band, can be light field
It is limited in the structure of micro-nano size with minimum loss.But the method for detecting silica-based waveguides quality, it is more in the prior art
It is to be observed by electron microscopy, this mode cost is higher, and speed is very slow, and is not easy to diagnose waveguide internal junction
The situation of structure.
And optical frequency domain reflectometer (Optical Frequency Domain Reflectometry, OFDR) is concerned with using high
Linear frequency sweep laser as light source, reference light and the measured device back-scattering light of measuring arm are subjected to beat frequency interference, led to
Cross the reception of beat frequency interference pattern and the demodulation of beat signal, you can obtain the back-reflection information at device different location.
But if OFDR to be applied to the detection of silica-based waveguides, need to solve incident sweeping laser and the coupled problem of silica-based waveguides, and
And the polarization state property of incident beam greatly influences coupling mass, and then the final data result of OFDR can be influenced.
Invention content
For the above the deficiencies in the prior art, the present invention provides a kind of, and the silica-based waveguides back reflection sensing based on OFDR fills
Set, it is therefore intended that can high speed, accurately and easily obtain the back reflection information of silica-based waveguides.Another object of the present invention is
A kind of measurement method using the sensing device is provided.
The technical solution that the device of the invention uses is as follows：
Silica-based waveguides back reflection sensing device based on OFDR, including tunable frequency swept laser, Polarization Control and beam splitting
Module, triggering interferometer, optical fiber circulator, stellar interferometer, coupling sensing module, high speed acquisition module and computer；It is described
The sweeping laser that tunable frequency swept laser sends out linear period variation is incident on Polarization Control and beam splitting module, the polarization control
The polarization state of system and beam splitting module control sweeping laser, and three tunnels are classified as, respectively enter triggering interferometer, optical fiber circulator
And stellar interferometer；The triggering interferometer makes incident sweeping laser that beat frequency interference occur, and generates the first beat signal；It is described
Incident sweeping laser is sent into coupling sensing module by optical fiber circulator；The coupling sensing module connects OFDR systems and is tested
Silica-based waveguides return to the optical fiber circulator after generating back reflection signal light；The stellar interferometer makes incident frequency sweep swash
Beat frequency interference occurs for the back reflection signal light of light and optical fiber circulator, generates the second beat signal；The high speed acquisition module connects
It receives the first beat signal and makes external timing signal, while receiving the second beat signal；The second beat frequency of the computer pair
Signal carries out data processing, obtains the relevant information of measured silica-based waveguides.
Further, the Polarization Control is adjusted to the polarization state of sweeping laser with beam splitting module the work of continuously adjustable
Make mode.
Further, the interference arm lengths of the inside of the triggering interferometer two differ.
Further, the optical fiber circulator is the operating mode that polarization is kept；The optical fiber circulator first port connects
The sweeping laser for coming from Polarization Control and beam splitting module is received, sweeping laser is sent by second port connection coupling sensing module
It couples in sensing module, and receives the back reflection signal light for coming from coupling sensing module, third port will come from second end
The back reflection signal light of mouth is sent into stellar interferometer.
Further, the coupling sensing module includes incident bare fibre, incident fixture displacement platform, outgoing bare fibre, goes out
Penetrate fixture displacement platform, light power meter and computer；One end of the incidence bare fibre and the second port of optical fiber circulator connect,
The other end is directed at the incidence position for being tested silica-based waveguides by incident fixture displacement platform；One end of the outgoing bare fibre is by going out
The outgoing position that the alignment of fixture displacement platform is tested silica-based waveguides is penetrated, the other end is connect with light power meter；The light power meter connection
Computer.
Further, the stellar interferometer is the operating mode that polarization is kept；The a port of stellar interferometer receives
Come from the sweeping laser of Polarization Control and beam splitting module, another port receives the signal light of back reflection.
The present invention utilizes the measurement method of the above-mentioned silica-based waveguides back reflection sensing device based on OFDR, including following step
Suddenly：
Build light path：Tunable laser is controlled by computer and sends out sweeping laser, according to tested silica-based waveguides itself
Propagation property, the centre wavelength and swept frequency range of sweeping laser are set so that the sweeping laser that tunable laser is sent out is all
It can be propagated in waveguide well, build light path and sweeping laser is made to pass through Polarization Control and beam splitting module, fiber annular successively
Device, coupling sensing module and light power meter, the optical power value that the computer that light power meter connects can be received with real-time display；
Couple coarse adjustment：By coupling the incident fixture displacement platform and outgoing fixture displacement platform of sensing module, coupling is sensed
The incident bare fibre of module is respectively aligned to the incidence end and exit end of silica-based waveguides with outgoing bare fibre, it is to be ensured that outgoing bare fibre
The exit end of silica-based waveguides can be accurately aimed at；
Couple fine tuning：The outgoing fixture displacement platform of fixed coupling sensing module is motionless, by the incidence for coupling sensing module
Fixture displacement platform accurately adjusts the incident bare fibre for coupling sensing module, so that transmitted optical power is reached maximum value, at this time
For optimal incident bare fibre position；
Polarization is adjusted：The incident fixture displacement platform and outgoing fixture displacement platform of fixed coupling sensing module are motionless, continuous to adjust
Polarization Control and beam splitting module are saved, makes the polarization state of incident sweeping laser that consecutive variations occur, transmitted optical power is made to reach one
Maximum is at this time optimal incident sweeping laser polarization state；
OFDR is measured：Connection triggering interferometer and stellar interferometer remove coupling sensing module to high speed acquisition module
Outgoing bare fibre；Tunable laser is controlled by computer and sends out sweeping laser, and sweeping laser is by Polarization Control and beam splitting
Module is divided into three tunnels：First via light enters triggering interferometer and beat frequency interference occurs, and generates the first beat signal, and adopted at a high speed
Collection module is received, external timing signal of the signal as high speed acquisition module；Second road light enters stellar interferometer conduct
Reference light；Third road light is admitted to by the first, second port of optical fiber circulator and the incident bare fibre of coupling sensing module
Tested silica-based waveguides, and backscatter signal light is generated, it is admitted to stellar interferometer using the third port of optical fiber circulator；The back of the body
With reference light beat frequency interference occurs in stellar interferometer for scattered signal light, generates the second beat signal, the second beat signal quilt
High speed acquisition module is received；
Demodulation：The second beat signal of computer pair is demodulated and show that the back reflection signal light of tested silica-based waveguides is opposite
In the reflectance spectrum of position coordinates；Analyze the reflectance spectrum it can be seen that, relevant information of the light beam in the internal transmission of tested silica-based waveguides.
The advantages and positive effects of the present invention：
(1) present invention propose a kind of silica-based waveguides back reflection sensing device based on OFDR, be utilized OFDR technologies with
The perfection of bare fibre coupling chip technology is compatible, relies on common silica-based waveguides chip coupled system, need not additionally increase coupling
Clutch part, thus it is simple in structure, it is easy to operate, convenient for promoting.
(2) present invention uses OFDR technologies, possesses high resolution, the advantages that speed is fast, can quickly obtain silica-based waveguides
Back reflection information, and the measurement for passing through non-intrusion type, so that it may accurately to obtain the beam section length and light beam of silica-based waveguides
Propagation quality in silica-based waveguides, such as the loss inside silica-based waveguides, breakpoint, bending, sidewall roughness information.
Description of the drawings
Fig. 1 is apparatus of the present invention general structure schematic diagram；
Fig. 2 is the inside concrete structure schematic diagram that sensing module is coupled in apparatus of the present invention；
Fig. 3 is the measurement method and flow chart of steps of apparatus of the present invention；
Fig. 4 is the first silica-based waveguides A back reflection signal curve tested using apparatus of the present invention and method；
Fig. 5 is the second silica-based waveguides B back reflection signal curve tested using apparatus of the present invention and method.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
Such as the structural schematic diagram of Fig. 1 methods to realize the present invention, device includes computer 1, tunable laser 2, polarization
Control with beam splitting module 3, triggering interferometer 4, stellar interferometer 5, optical fiber circulator 6, high speed acquisition module 7 and couple sense mould
Block 8.Tunable frequency swept laser 2 is used to send out the sweeping laser of linear period variation, Polarization Control and beam splitting module 3, is used for
The polarization state for controlling sweeping laser, is divided into three tunnels by sweeping laser, respectively enters triggering interferometer 4, stellar interferometer 5 and optical fiber
Circulator 6；Triggering interferometer 4 enters sweeping laser therein generation beat frequency interference for making, and generates the first beat signal；Optical fiber
Incident sweeping laser is sent into coupling sensing module 8 by circulator 6, and receives back reflection signal light；Sensing module 8 is coupled to connect
OFDR systems and tested silica-based waveguides device, receive the sweeping laser for coming from optical fiber circulator 6, and generate back reflection signal light
Send optical fiber circulator 6 back to；The back of the body that stellar interferometer 5 is used to make to enter sweeping laser therein with come from optical fiber circulator 6 is anti-
It penetrates signal light and beat frequency interference occurs, generate the second beat signal.
If Fig. 2 is the inside concrete structure schematic diagram for coupling sensing module 8, module includes incident fixture displacement platform 9, incidence
Bare fibre 10, outgoing bare fibre 11, outgoing fixture displacement platform 12, light power meter 14, computer 1 and tested silica-based waveguides 13.It is existing
Connecting inner specific device is illustrated the early-stage preparations of the present invention and operating method.
Build light path：Tunable laser 2 is controlled by computer 1 and sends out sweeping laser, according to tested silica-based waveguides 13
The centre wavelength and swept frequency range of sweeping laser is arranged in the propagation property of itself so that the frequency sweep that tunable laser 2 is sent out swashs
Light can be propagated in waveguide well, build light path and sweeping laser is made to pass through Polarization Control and beam splitting module 3, optical fiber successively
Circulator 6, incident bare fibre 11, tested silica-based waveguides 13, outgoing bare fibre 11 and light power meter 14, what light power meter 14 connected
The optical power value that computer 1 can be received with real-time display.Incident bare fibre 10 and outgoing bare fibre 11 are removal surrounding layer
Bare fibre.
Then the coupling coarse adjustment that outgoing bare fibre 11 arrives silica-based waveguides 13 is carried out, incident fixture displacement platform 9 and outgoing are passed through
Incident bare fibre 10 is respectively aligned to the incidence end and exit end of silica-based waveguides with outgoing bare fibre 11, by fixture displacement platform 12
Ensure that the exit end of silica-based waveguides can be accurately aimed at by being emitted bare fibre 11.This step adjusts incident bare fibre 10 and outgoing simultaneously
Bare fibre 11 ensures that transmitted light can be received successfully by light power meter, so as to subsequent operation.
Then it carries out incident bare fibre 10 and arrives the tested coupling of silica-based waveguides 13 fine tuning, keep outgoing fixture displacement platform 12 not
Dynamic, transmitted optical power will not be had an impact by being emitted bare fibre 11 at this time.By incident fixture displacement platform 9 to incident bare fibre 10
Fine adjustments are carried out, so that transmitted optical power is reached maximum, is at this time optimal 10 position of incident bare fibre, it is ensured that carry out
When OFDR is measured, sweeping laser can be sent into as much as possible and be tested silica-based waveguides 13, also received as much as possible and be tested silicon
The back reflection signal light of based waveguides 13.
Then the polarization for carrying out incident sweeping laser is adjusted, fixed incidence fixture displacement platform 9 and outgoing fixture displacement platform 12
It is motionless, Polarization Control and beam splitting module 3 are continuously adjusted, makes the polarization state of incident sweeping laser that consecutive variations occur, makes transmitted light
Power reaches a maximum value, is at this time optimal incident sweeping laser polarization state.Because for using grating coupled modes
The polarization state of silica-based waveguides device, incident sweeping laser has extreme influence to coupling effect, and a best incidence is needed to sweep
Frequency laser polarization state, coupling effect is best at this time.
Then OFDR measurements are carried out：Connection triggering interferometer 4 and stellar interferometer 5 are removed out to high speed acquisition module
Penetrate bare fibre 11；Tunable laser 2 is controlled by computer 1 and sends out sweeping laser, and sweeping laser is by Polarization Control and beam splitting
Tri- tunnels 3 Fen Wei of module：First via light enters triggering interferometer 4 and beat frequency interference occurs, and generates the first beat signal, and by high speed
Acquisition module 7 is received, external timing signal of the signal as high speed acquisition module, and high speed acquisition module has external clock
Port is triggered, and there is at least two simulation input port；Second road light enters stellar interferometer 5 as with reference to light；Third road light
Tested silica-based waveguides 13 are admitted to by 6 first, second port of optical fiber circulator and incident bare fibre 10, and generate back scattering letter
Number light, stellar interferometer 5 is admitted to using 6 third port of optical fiber circulator.Backscatter signal light is dry in measurement with reference light
Beat frequency interference occurs in interferometer 5, generates the second beat signal, the second beat signal is received by high speed acquisition module 7.Wherein,
The optical fiber of 6 three ports of optical fiber circulator is the operating mode for polarizing twin shaft conducting；Incident bare fibre 10 is that polarization twin shaft is led
Logical operating mode, light power meter 14 are the operating mode of real-time display power data；The light of two ports of stellar interferometer 5
Fibre is polarization twin shaft ON operation pattern.
Demodulation：Computer 1 second beat signal is demodulated and obtain the back reflection signal lights of silica-based waveguides relative to
The reflectance spectrum of position coordinates；Analyze the reflectance spectrum it can be seen that, relevant information of the light beam in the internal transmission of tested silica-based waveguides 13.
If the active length that known triggering interferometer 4 postpones optical fiber is L, refractive index n is that can find out interference signal to touch every time
The laser light source frequency interval Δ ν of hair is：
Wherein τtDelay time of the acute pyogenic infection of finger tip light in postponing optical fiber, c is the light velocity；Then it according to laser swept frequency range δ f, obtains
Go out the data points N once detected：
Known laser swept frequency range is tested the group index n of silica-based waveguides 13g, the spatial resolution of measuring system can be obtained：
Fig. 4 and Fig. 5 is two silica-based waveguides, the 13 back reflection signal tested twice using apparatus of the present invention and method
Curve, abscissa indicate that unit is the distance of m, and ordinate indicates that unit is the reflectivity of dB.This is that two root long degree are identical, passes through
With the on piece silica-based waveguides that a batch technique is produced, apparent structural difference is also can't see under electron microscope, is respectively designated as
Silica-based waveguides A and silica-based waveguides B.
It is special to the reflection of light beam according to signal curve as can be seen that two silica-based waveguides length are identical, but inside waveguide
Point different from.Section start especially inside waveguide, there are one apparent reflection peaks by silica-based waveguides A, and silica-based waveguides B is whole
Body does not have the appearance of very strong reflection peak.This illustrates that silica-based waveguides A in the position where reflection peak, may be asked due to manufacture craft
It inscribes, the material inside waveguide is unevenly distributed, or since hackly defect occurs in this region side walls.And silicon substrate
The propagation quality of light beam inside waveguide B will obviously can be more preferable.It can thus be seen that using apparatus of the present invention and method, it can be non-embedding
Enter, nondestructively detect silica-based waveguides internal feature, possess good application prospect.
Claims (10)
1. the silica-based waveguides back reflection sensing device based on OFDR, which is characterized in that the device include tunable frequency swept laser,
Polarization Control and beam splitting module, optical fiber circulator, stellar interferometer, couple sensing module, high speed acquisition module at triggering interferometer
And computer；The sweeping laser that the tunable frequency swept laser sends out linear period variation is incident on Polarization Control and beam splitting mould
Block, the polarization state of the Polarization Control and beam splitting module control sweeping laser, and three tunnels are classified as, respectively enter triggering interference
Instrument, optical fiber circulator and stellar interferometer；The triggering interferometer makes incident sweeping laser that beat frequency interference occur, and generates first
Beat signal；Incident sweeping laser is sent into coupling sensing module by the optical fiber circulator；The coupling sensing module connection
OFDR systems and tested silica-based waveguides, the optical fiber circulator is returned to after generating back reflection signal light；The stellar interferometer
Make the back reflection signal light of incident sweeping laser and optical fiber circulator that beat frequency interference occur, generates the second beat signal；It is described
High speed acquisition module receives the first beat signal and makes external timing signal, while receiving the second beat signal；The meter
The second beat signal of calculation machine pair carries out data processing, obtains the relevant information of measured silica-based waveguides.
2. the silica-based waveguides back reflection sensing device according to claim 1 based on OFDR, which is characterized in that the polarization
Control is adjusted to the polarization state of sweeping laser with beam splitting module the working method of continuously adjustable.
3. the silica-based waveguides back reflection sensing device according to claim 1 based on OFDR, which is characterized in that the triggering
The interference arm lengths of inside two of interferometer differ.
4. the silica-based waveguides back reflection sensing device according to claim 1 based on OFDR, which is characterized in that the optical fiber
Circulator is the operating mode that polarization is kept；The optical fiber circulator first port reception comes from Polarization Control and beam splitting module
Sweeping laser, second port connection coupling sensing module, by sweeping laser be sent into coupling sensing module in, and receive come from
The back reflection signal light of sensing module is coupled, the back reflection signal light for coming from second port is sent into and measures interference by third port
Instrument.
5. the silica-based waveguides back reflection sensing device according to claim 4 based on OFDR, which is characterized in that the optical fiber
The optical fiber of three ports of circulator is the operating mode for polarizing twin shaft conducting.
6. the silica-based waveguides back reflection sensing device according to claim 1 based on OFDR, which is characterized in that the coupling
Sensing module includes incident bare fibre, incident fixture displacement platform, outgoing bare fibre, outgoing fixture displacement platform, light power meter and meter
Calculation machine；One end of the incidence bare fibre and the second port of optical fiber circulator connect, and the other end passes through incident fixture displacement platform
Alignment is tested the incidence position of silica-based waveguides；One end of the outgoing bare fibre is tested silicon substrate by being emitted the alignment of fixture displacement platform
The outgoing position of waveguide, the other end are connect with light power meter；The light power meter connects computer.
7. the silica-based waveguides back reflection sensing device according to claim 6 based on OFDR, which is characterized in that the incidence
Bare fibre and outgoing bare fibre are the bare fibre for removing surrounding layer, and the incidence bare fibre is the Working mould for polarizing twin shaft conducting
Formula, the light power meter are the operating mode of real-time display power data.
8. the silica-based waveguides back reflection sensing device based on OFDR stated according to claim 1, which is characterized in that described measure is done
Interferometer is the operating mode that polarization is kept；The a port of stellar interferometer, which receives, comes from sweeping for Polarization Control and beam splitting module
Frequency laser, another port receive the signal light of back reflection.
9. the silica-based waveguides back reflection sensing device according to claim 8 based on OFDR, which is characterized in that the measurement
The optical fiber of two ports of interferometer is polarization twin shaft ON operation pattern.
10. using the measurement method of the silica-based waveguides back reflection sensing device based on OFDR as described in claim 1, feature exists
In including the following steps：
Build light path：Tunable laser is controlled by computer and sends out sweeping laser, according to the biography of tested silica-based waveguides itself
Property is broadcast, the centre wavelength and swept frequency range of sweeping laser are set so that the sweeping laser that tunable laser is sent out can be good
It is propagated in waveguide well, build light path and sweeping laser is made to pass through Polarization Control and beam splitting module, optical fiber circulator, coupling successively
Close sensing module and light power meter, the optical power value that the computer that light power meter connects can be received with real-time display；
Couple coarse adjustment：By coupling the incident fixture displacement platform and outgoing fixture displacement platform of sensing module, sensing module will be coupled
Incident bare fibre be respectively aligned to the incidence end and exit end of silica-based waveguides with outgoing bare fibre, it is to be ensured that outgoing bare fibre can
It is accurately aimed at the exit end of silica-based waveguides；
Couple fine tuning：The outgoing fixture displacement platform of fixed coupling sensing module is motionless, by the incident fixture for coupling sensing module
Displacement platform accurately adjusts the incident bare fibre for coupling sensing module, so that transmitted optical power is reached maximum value, at this time for most
Excellent incident bare fibre position；
Polarization is adjusted：The incident fixture displacement platform and outgoing fixture displacement platform of fixed coupling sensing module are motionless, continuously adjust partially
It shakes control and beam splitting module, makes the polarization state of incident sweeping laser that consecutive variations occur, transmitted optical power is made to reach a maximum,
It is optimal incident sweeping laser polarization state at this time；
OFDR is measured：Connection triggering interferometer and stellar interferometer remove going out for coupling sensing module to high speed acquisition module
Penetrate bare fibre；Tunable laser is controlled by computer and sends out sweeping laser, and sweeping laser is by Polarization Control and beam splitting module
It is divided into three tunnels：First via light enters triggering interferometer and beat frequency interference occurs, and generates the first beat signal, and by high speed acquisition mould
Block is received, external timing signal of the signal as high speed acquisition module；Second road light enters stellar interferometer as reference
Light；Third road light is admitted to tested by the first, second port of optical fiber circulator and the incident bare fibre of coupling sensing module
Silica-based waveguides, and backscatter signal light is generated, it is admitted to stellar interferometer using the third port of optical fiber circulator；Back scattering
With reference light beat frequency interference occurs in stellar interferometer for signal light, generates the second beat signal, the second beat signal is by high speed
Acquisition module is received；
Demodulation：The second beat signal of computer pair is demodulated and obtains the back reflection signal light of tested silica-based waveguides relative to position
Set the reflectance spectrum of coordinate；Analyze the reflectance spectrum it can be seen that, relevant information of the light beam in the internal transmission of tested silica-based waveguides.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110375782A (en) * | 2019-07-29 | 2019-10-25 | 武汉隽龙科技股份有限公司 | Improve the device and method of OFDR single sweep operation demodulation speed |
| CN114813576A (en) * | 2022-04-19 | 2022-07-29 | 浙江大学 | Self-adaptive all-fiber laser ultrasonic measuring instrument |
| WO2023001158A1 (en) * | 2021-07-20 | 2023-01-26 | 广东工业大学 | Optical frequency domain interference-based distributed bidirectional polarization measurement apparatus for optical fiber device |
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