CN110518967A - A kind of uniaxial optical fibers interferometer and the positioning device for eliminating fiber-optic vibration blind area - Google Patents
A kind of uniaxial optical fibers interferometer and the positioning device for eliminating fiber-optic vibration blind area Download PDFInfo
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- CN110518967A CN110518967A CN201910885591.8A CN201910885591A CN110518967A CN 110518967 A CN110518967 A CN 110518967A CN 201910885591 A CN201910885591 A CN 201910885591A CN 110518967 A CN110518967 A CN 110518967A
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- 230000008030 elimination Effects 0.000 abstract description 6
- 238000003379 elimination reaction Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 22
- 238000000253 optical time-domain reflectometry Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
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- 238000000034 method Methods 0.000 description 3
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- 238000012360 testing method Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910052934 alunite Inorganic materials 0.000 description 1
- 239000010424 alunite Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 238000002310 reflectometry Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0771—Fault location on the transmission path
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Abstract
The invention discloses a kind of uniaxial optical fibers interferometer and the positioning devices of elimination fiber-optic vibration blind area.The uniaxial optical fibers interferometer includes: the first optical splitter, first choice switch, the first fiber delay line, the second fiber delay line, short fiber and the second optical splitter；The output end of first optical splitter is connect with the input terminal that first choice switchs；The output end of first choice switch is connect with one end of one end of the first fiber delay line and the second fiber delay line respectively；The other end of the other end of first fiber delay line and the second fiber delay line is connect with the input terminal of the second optical splitter；The input terminal of second optical splitter is connect with the output end of the first optical splitter by a short fiber.Uniaxial optical fibers interferometer provided by the invention and the positioning device for eliminating fiber-optic vibration blind area caused by capable of eliminating because of Fresnel transmitting the problem of fiber-optic vibration blind location area, and have the characteristics that of simple structure and low cost and registration.
Description
Technical field
The present invention relates to optic communication test and technical field of optical fiber sensing, more particularly to a kind of uniaxial optical fibers interferometer and
Eliminate the positioning device of fiber-optic vibration blind area.
Background technique
When safeguarding fiber optic network, in addition to optical time domain reflectometer (OTDR), there are also fiber failure trackers for common instrument.Light
Time-domain reflectomer can measure the fiber lengths of fiber failure point, and fiber failure tracker can measure the optical fiber of optical fiber disturbance point
Length can relatively accurately estimate fiber failure point by the difference of analysis optical fiber disturbance point and the fiber lengths of fiber failure point
Geographical location.
Different according to the perturbation scheme to optical fiber, current fiber failure tracker is mainly based upon following several principles:
Polarization-optical time domain reflectometer (P-OTDR) detection optical fiber bending change, to progress Distance positioning (Chinese patent at curved fiber
A kind of pair of pinpoint method of fiber failure point of CN201410662192.2)；Use Brillouin-optical time domain reflectometer (B-
OTDR) or Raman-optical time domain reflectometer (R-OTDR) detection optical fiber temperature, to carrying out Distance positioning at optical fiber heating；Use phase
The vibration of position-optical time domain reflectometer (Φ-OTDR) detection optical fiber carries out Distance positioning to tapping at optical fiber；Using uniaxial Sagnac
Fibre optic interferometer adds the differential phase-OTDR detection optical fiber of OTDR to vibrate, and Distance positioning (United States Patent (USP) is carried out at optical fiber to tapping
US20070264012A1-Identifying or Locating Waveguides)。
Exact position positioning is carried out to fiber failure using the mode of P-OTDR detection optical fiber bending change, the disadvantage is that requiring
The bending of diameter 1m or so can be carried out to optical fiber.If optical fiber is laid tighter, the optical fiber that can not take out sufficient length is used for
Bending, then implement fibre-optical bending with regard to relatively difficult, by using P-OTDR detection curved fiber mode to fiber failure into
The positioning of row exact position also just becomes to be inconvenient.Optical fiber disturbance point is carried out using B-OTDR, R-OTDR or Φ-OTDR accurate
Position positioning, primary disadvantage is that the cost of B-OTDR, R-OTDR or Φ-OTDR are too high.
Add the differential phase-OTDR of OTDR to put optical fiber disturbance (vibration) using uniaxial Sagnac fibre optic interferometer and carries out essence
True position positioning, moderate cost, and it is easy to operate.But in a fiber, exist because the factors such as connector, breakpoint, end face are drawn
The Fresnel reflection risen, for the Rayleigh scattering signal that is generated compared with optical fiber of optical signal that Fresnel reflection generates, intensity height number
A magnitude, it is luxuriant and rich with fragrance in place of Fresnel reflection occurs when the vibration position in detection fiber is removed in the light pulse using musec order
Alunite ear reflex signal may mask Rayleigh scattering signal completely, thus generate one to hundreds of meters blind area.It deposits this blind area
Seriously affecting the location accuracy to fiber-optic vibration position.Therefore, in the use differential phase-OTDR to fiber-optic vibration position
It sets when being accurately positioned, fiber-optic vibration blind location area caused by needing to solve the problems, such as because of optical fiber Fresnel reflection.
Summary of the invention
The object of the present invention is to provide a kind of uniaxial optical fibers interferometer and the positioning devices of elimination fiber-optic vibration blind area, can
Caused by eliminating because of Fresnel transmitting the problem of fiber-optic vibration blind location area, and there is of simple structure and low cost and positioning accurate
True feature.
To achieve the above object, the present invention provides following schemes:
A kind of uniaxial optical fibers interferometer, comprising: the first optical splitter, first choice switch, the first fiber delay line, second
Fiber delay line, short fiber and the second optical splitter；
The output end of first optical splitter is connect with the input terminal that the first choice switchs；
The output end of first choice switch respectively with one end of first fiber delay line and second optical fiber
One end of delay line connects；
The other end of the other end of first fiber delay line and second fiber delay line with second light
The input terminal of splitter connects；
The input terminal of second optical splitter is connect with the output end of first optical splitter by a short fiber.
Optionally, the uniaxial optical fibers interferometer includes: the second selection switch；
The other end of the other end of first fiber delay line and second fiber delay line passes through described second
Selection switch is connect with the input terminal of second optical splitter；Wherein, the other end of first fiber delay line and described
The other end of second fiber delay line is connect with the input terminal of the second selection switch, the output of the second selection switch
End is connect with the input terminal of second optical splitter.
Optionally, the first choice switch and the second selection switch are 1x2 photoswitch.
Optionally, the length range of the length range of first fiber delay line and second fiber delay line is
500m~20km.
Optionally, first optical splitter is the 2x2 optical splitter that splitting ratio is 50 to 50；Second optical splitter
The 1x2 optical splitter for being 50 to 50 for splitting ratio.
It is a kind of eliminate fiber-optic vibration blind area positioning device, comprising: above-mentioned uniaxial optical fibers interferometer, optical pulse transmitter and
Light pulse receiver；
The input terminal of the first optical splitter in the output end of the optical pulse transmitter and the uniaxial optical fibers interferometer
Connection；
The output end of the first optical splitter in the input terminal of the light pulse receiver and the uniaxial optical fibers interferometer
Connection；
The output end of the uniaxial optical fibers interferometer is connect with tested optical fiber.
Optionally, the length difference of the first fiber delay line in the uniaxial optical fibers interferometer and the second fiber delay line
Numerical value is greater than 1/5th of the width numerical value for the light pulse that the optical pulse transmitter is emitted.
Optionally, the range of the light impulse length value of the optical pulse transmitter is 50ns~5000ns.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: single shaft provided by the invention
Fibre optic interferometer, by using length different the first fiber delay line and the second fiber delay line, so that it may constitute a kind of knot
The better simply novel uniaxial optical fibers interferometer of structure.In the device constituted using this novel uniaxial optical fibers interferometer to optical fiber
During oscillating component is positioned, when section passes through the length of the selected fiber delay line of selection switch in different times
When different, the position of fiber-optic vibration measurement blind area caused by Fresnel reflection point is also different in tested optical fiber, therefore different measurements
In period when measurement fiber-optic vibration, measured blind zone position is difference, then by the knot measured in different time sections
Fruit is screened and is calculated, so that it may eliminate the fiber-optic vibration measurement blind area caused by Fresnel reflection effect due to lead to positioning not
It is accurate to influence.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of uniaxial optical fibers of embodiment of the present invention interferometer；
Fig. 2 is the structural schematic diagram that the embodiment of the present invention eliminates fiber-optic vibration blind location area device；
Fig. 3 is using fiber-optic vibration location data curve graph acquired in the prior art；
Fig. 4 is the data graphs using fiber-optic vibration blind location area acquired in the prior art；
Fig. 5 is using fiber-optic vibration location data acquired in elimination fiber-optic vibration blind location area device provided by the invention
Curve graph.
Appended drawing reference: 1- uniaxial optical fibers interferometer, the first optical splitter of 11-, 12- first choice switch, the first optical fiber of 13-
Delay line, the second fiber delay line of 14-, 15- short fiber, the second optical splitter of 16-, the selection switch of 17- second, 2- light pulse hair
Penetrate machine, 3- light pulse receiver, 4- tested optical fiber.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of uniaxial optical fibers interferometer and the positioning devices of elimination fiber-optic vibration blind area, can
Caused by eliminating because of Fresnel transmitting the problem of fiber-optic vibration blind location area, and there is of simple structure and low cost and positioning accurate
True feature.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the structural schematic diagram of uniaxial optical fibers of embodiment of the present invention interferometer, as shown in Figure 1, a kind of uniaxial optical fibers are dry
Interferometer, comprising: the first optical splitter 11, first choice switch 12, the first fiber delay line 13, the second fiber delay line 14, short
Optical fiber 15 and the second optical splitter 16.
The output end of first optical splitter 11 is connect with the input terminal of the first choice switch 12.
The output end of the first choice switch 12 respectively with one end of first fiber delay line 13 and described second
One end of fiber delay line 14 connects.
The other end of the other end of first fiber delay line 13 and second fiber delay line 14 is with described
The input terminal of two optical splitters 16 connects.
The output end of the input terminal of second optical splitter 16 and first optical splitter 11 passes through a short fiber 15
Connection.
The uniaxial optical fibers interferometer can also include the second selection switch 17.
The other end of the other end of first fiber delay line 13 and second fiber delay line 14 passes through described
Second selection switch 17 is connect with the input terminal of second optical splitter 16.Wherein, first fiber delay line 13 is another
The other end of one end and second fiber delay line 14 is connect with the input terminal of the second selection switch 17, and described second
The output end of selection switch 17 is connect with the input terminal of second optical splitter 16.
The first choice switch 12 and the second selection switch 17 are 1x2 photoswitch.
The length range of the length range of first fiber delay line 13 and second fiber delay line 14 is
500m~20km.The length of preferred first fiber delay line is 5.0km, and the length of the second fiber delay line is 2.5km.To
When the length of one optical-fibre delay line and the second optical-fibre delay line is selected, it should be taken into account that used in device provided by the present invention
Light emitting pulse width and photoreceiver from saturation state is entered to the duration for exiting saturation state completely.
First optical splitter 11 is the 2x2 optical splitter that splitting ratio is 50 to 50.Second optical splitter 16 is
The 1x2 optical splitter that splitting ratio is 50 to 50.
As shown in Fig. 2, a kind of positioning device for eliminating fiber-optic vibration blind area provided by the invention, comprising: above-mentioned composition
Uniaxial optical fibers interferometer 1, optical pulse transmitter 2 and light pulse receiver 3.
The output end of the optical pulse transmitter 2 is defeated with the first optical splitter 11 in the uniaxial optical fibers interferometer 1
Enter end connection.
The input terminal of the light pulse receiver 3 is defeated with the first optical splitter 11 in the uniaxial optical fibers interferometer 1
Outlet connection.
The output end of the uniaxial optical fibers interferometer 1 is connect with tested optical fiber 4.
The number of the length difference of the first fiber delay line 13 and the second fiber delay line 14 in the uniaxial optical fibers interferometer 1
Value (unit is by rice) be greater than the width numerical value (unit is nanosecond) of light pulse that the optical pulse transmitter 2 emits five/
One, wherein the association between the two numerical value only numerically is unrelated with numerical value unit used by the two.
The range of the light impulse length value of the optical pulse transmitter 2 is 50ns~5000ns.
In the apparatus of the present, light source type used by optical pulse transmitter 2 is F-P LD or SLD, operation wavelength
For the C-band of 1310nm wave band, 1490 wave bands or 1550nm, the L-band of 1550nm and any one among 1625nm wave band.
Its operation wavelength is preferably the C-band of 1550nm.
The detector that light pulse receiver 3 uses is APD or PIN.
The specific works of fiber-optic vibration positioning are carried out using elimination fiber-optic vibration blind location area device provided by the present invention
Principle is:
During being positioned to fiber-optic vibration position, in order to avoid the influence of fiber-optic vibration blind area bring, in light
After pulse transmitter 2 generates light pulse signal, after generated light pulse signal is transferred to uniaxial optical fibers interferometer 1, enter
Tested optical fiber 4.Backscatter signal and reflection signal in tested optical fiber 4 enter back into Guang Mai after entering uniaxial optical fibers interferometer 1
Rush receiver 3.
During the positioning of entire fiber-optic vibration, (first choice switch and the second selection switch) is switched by selection,
The fiber delay line (the first fiber delay line or the second fiber delay line) of different length is selected in different measuring sections；When
When the fiber delay time line length difference of uniaxial optical fibers interferometer, fiber-optic vibration caused by Fresnel reflection point is measured in tested optical fiber
Blind zone position is different, therefore in different measuring sections when measurement fiber-optic vibration, the position of measurement blind area is also different.When two light
The length difference of fine delay line is sufficiently large, and measurement blind area would not be overlapped；It is carried out to measuring to obtain result in two periods
After screening, calculating, so that it may eliminate the fiber-optic vibration measurement blind area caused by Fresnel reflection effect due to cause positioning inaccurate
Influence.
And use the concrete operations of measurement blind area caused by device provided by the present invention elimination optical fiber Fresnel reflection
Journey are as follows:
The time of one-shot measurement is divided into two periods, and guarantees that the mode of taken percussion optical fiber can make optical fiber
It is all vibrated more than once in every section of time of measuring；
In first measuring section, the first fiber delay line is accessed uniaxial optical fibers interferometer by control selections switch
In；After optical pulse transmitter emits light pulse signal every time, 1 frame optical fiber back scattering and backward anti-is obtained by light pulse receiver
Penetrate signal data DK1；The adjacent data of two frames are subtracted each other, it may be assumed that Δ DK1=DK1+1-DK1；Display signal number is carried out with curve mode
According to sequence Δ DK1, the variation of Y-axis expression backscatter signal amplitude, X-axis expression fiber lengths；Since coordinate origin, forward
Point-by-point displacement meter calculates data sequence Δ DK1, as signal data sequence Δ DK1In Y value occur be greater than setting threshold value Yt1When, note
The point on lower curve is recorded, is displaced, calculated point by point from the point toward coordinate origin direction, when the curve of certain point on curve is oblique
When rate begins to change into negative value (or zero) by positive value, which corresponds to fiber-optic vibration position, and the value of the X-axis of the point subtracts first light
The half of fine delay line length value, obtained value S1For the optical fiber optical length value of fiber-optic vibration position to measuring device；
In second measuring section, the second fiber delay line is accessed uniaxial optical fibers interferometer by control selections switch
In；After optical pulse transmitter emits light pulse signal every time, 1 frame optical fiber back scattering and backward anti-is obtained by light pulse receiver
Penetrate signal data DK2；The adjacent data of two frames are subtracted each other, it may be assumed that Δ DK2=DK2+1-DK；Display signal data is carried out with curve mode
Sequence Δ DK2, the variation of Y-axis expression backscatter signal amplitude, X-axis expression fiber lengths；Since coordinate origin, forward by
Point displacement calculates data sequence Δ DK2, as signal data sequence Δ DK2In Y value occur be greater than setting threshold value Yt2When, record
The point on lower curve, is displaced from the point toward coordinate origin direction, is calculated, point by point when the slope of curve of certain point on curve
When beginning to change into negative value (or zero) by positive value, which corresponds to fiber-optic vibration position, and the value of the X-axis of the point subtracts the second optical fiber and prolongs
When wire length angle value half, obtained value S2For the optical fiber optical length value of fiber-optic vibration position to measuring device；；
Compare S1And S2Size, the small value of numerical value is final fiber-optic vibration position prolonging to measuring device among the two
When optical fiber length value.
The time of measuring of measuring section is 1s~180s, preferably 10s twice.The threshold value Y of settingt1With the threshold value of setting
Yt2Value range is 0.05~0.2dB.
In addition, further combined with test data curve come the advantages of verifying device provided by the present invention, it is specific as follows:
Fig. 3 is two after the OTDR data frame signal carried out using the uniaxial optical fibers interferometer provided in the prior art is subtracted each other
Group data, series 1 are data groups when not vibrating on optical fiber, and series 2 is data group when having vibration on optical fiber.From series 2
Data group can also learn vibration occur position at a point, the end of tested optical fiber is at e point.
If the end of tested optical fiber is more smooth, stronger Fresnel reflection will be generated, reflectivity may be up to -15dB,
And the scattered power of optical fiber then only has -50dB or so (1550nm wavelength, 1 microsecond of light impulse length), optical signal level differs
35dB.For the amplifier of light pulse receiver, for the scattered signal of normally reception optical fiber, certain increasing is needed
Benefit, when receiving stronger Fresnel reflection signal, amplifying circuit will go into saturation state.Enter saturation state in circuit
Period, the signal value obtained through A/D circuit will not generate variation, it is meant that be measurement blind area during signal saturation.
It is the single fiber line of time delay in the case where there is stronger Fresnel reflection in the end of tested optical fiber shown in Fig. 4
The differential phase-OTDR acquired in data.As can be seen that numerical value is 0 in b point to c point.If a point in position occurs for vibration
Unfortunately b point is fallen between c point, although still may determine that there is vibration on optical fiber at this time, will be unable to determine a point
The exact value of position,.
And device provided by the present invention is used to carry out in the first measurement period of fiber-optic vibration position, vibrate location data
Curve is as shown in the series 1 in Fig. 5；In the second measurement period, vibration location data curve is such as
Shown in series 2 in Fig. 5.The measurement blind area of serial 1 curve is b-c, and the measurement blind area of serial 2 curves is b'-c',
The region b-c and the region b'-c' are not overlapped.So if fiber-optic vibration point a falls into the region b-c, that would not fall into the area b'-c'
Domain；, whereas if fiber-optic vibration point a falls into the region b'-c', that would not fall into the region b-c.Therefore, by the first measurement period
After merging, screen with the measurement result of the second measurement period, finally obtained fiber-optic vibration point position measurements are not
It is influenced by Fresnel reflection present in optical fiber.
Uniaxial optical fibers interferometer provided by the invention, by using length different the first fiber delay line and the second optical fiber
Delay line, so that it may constitute a kind of better simply novel uniaxial optical fibers interferometer of structure.Using this novel uniaxial optical fibers
During the device that interferometer is constituted positions fiber-optic vibration part, when section passes through selection switch in different times
When the length difference of selected fiber delay line, fiber-optic vibration measurement blind area caused by Fresnel reflection point in tested optical fiber
Position is also different, therefore in different measuring sections when measurement fiber-optic vibration, measured blind zone position is difference, then passing through
The result measured in different time sections is screened and calculated, so that it may which optical fiber caused by eliminating because of Fresnel reflection effect shakes
It moves measurement blind area and causes to position inaccurate influence.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (8)
1. a kind of uniaxial optical fibers interferometer characterized by comprising the first optical splitter, first choice switch, the first optical fiber prolong
When line, the second fiber delay line, short fiber and the second optical splitter；
The output end of first optical splitter is connect with the input terminal that the first choice switchs；
The output end of first choice switch respectively with one end of first fiber delay line and second fiber delay time
One end of line connects；
The other end of the other end of first fiber delay line and second fiber delay line with second optical branching
The input terminal of device connects；
The input terminal of second optical splitter is connect with the output end of first optical splitter by a short fiber.
2. a kind of uniaxial optical fibers interferometer according to claim 1, which is characterized in that the uniaxial optical fibers interferometer packet
It includes: the second selection switch；
The other end of the other end of first fiber delay line and second fiber delay line passes through described second and selects
Switch is connect with the input terminal of second optical splitter；Wherein, the other end of first fiber delay line and described second
The other end of fiber delay line with it is described second selection switch input terminal connect, it is described second selection switch output end and
The input terminal of second optical splitter connects.
3. a kind of uniaxial optical fibers interferometer according to claim 2, which is characterized in that first choice switch and described
Second selection switch is 1x2 photoswitch.
4. a kind of uniaxial optical fibers interferometer according to claim 1, which is characterized in that the length of first fiber delay line
The length range for spending range and second fiber delay line is 500m~20km.
5. a kind of uniaxial optical fibers interferometer according to claim 1, which is characterized in that first optical splitter is light splitting
Than the 2x2 optical splitter for 50 to 50；Second optical splitter is the 1x2 optical splitter that splitting ratio is 50 to 50.
6. a kind of positioning device for eliminating fiber-optic vibration blind area characterized by comprising such as claim 1-5 any one institute
Uniaxial optical fibers interferometer, optical pulse transmitter and the light pulse receiver stated；
The output end of the optical pulse transmitter is connect with the input terminal of the first optical splitter in the uniaxial optical fibers interferometer；
The input terminal of the light pulse receiver is connect with the output end of the first optical splitter in the uniaxial optical fibers interferometer；
The output end of the uniaxial optical fibers interferometer is connect with tested optical fiber.
7. a kind of positioning device for eliminating fiber-optic vibration blind area according to claim 6, which is characterized in that the single shaft light
The numerical value of the length difference of the first fiber delay line and the second fiber delay line in fine interferometer is greater than the optical pulse transmitter
/ 5th of the width numerical value of the light pulse emitted.
8. a kind of positioning device for eliminating fiber-optic vibration blind area according to claim 7, which is characterized in that the light pulse
The range of the light impulse length value of transmitter is 50ns~5000ns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910885591.8A CN110518967B (en) | 2019-09-19 | 2019-09-19 | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area |
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| CN201910885591.8A CN110518967B (en) | 2019-09-19 | 2019-09-19 | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area |
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| CN110518967B CN110518967B (en) | 2024-04-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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