CN110518967B - Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area - Google Patents
Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area Download PDFInfo
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- CN110518967B CN110518967B CN201910885591.8A CN201910885591A CN110518967B CN 110518967 B CN110518967 B CN 110518967B CN 201910885591 A CN201910885591 A CN 201910885591A CN 110518967 B CN110518967 B CN 110518967B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 205
- 230000003287 optical effect Effects 0.000 claims abstract description 102
- 239000000835 fiber Substances 0.000 claims description 33
- 238000005259 measurement Methods 0.000 description 25
- 238000000034 method Methods 0.000 description 12
- 238000000253 optical time-domain reflectometry Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
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- 238000010438 heat treatment Methods 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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- Testing Of Optical Devices Or Fibers (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a single-axis optical fiber interferometer and a positioning device for eliminating an optical fiber vibration blind area. The single axis optical fiber interferometer includes: the optical fiber optical system comprises a first optical splitter, a first selector switch, a first optical fiber delay line, a second optical fiber delay line, a short optical fiber and a second optical splitter; the output end of the first optical splitter is connected with the input end of the first selection switch; the output end of the first selection switch is respectively connected with one end of the first optical fiber delay line and one end of the second optical fiber delay line; the other end of the first optical fiber delay line and the other end of the second optical fiber delay line are connected with the input end of the second optical splitter; the input end of the second optical splitter is connected with the output end of the first optical splitter through a short optical fiber. The single-axis optical fiber interferometer and the positioning device for eliminating the optical fiber vibration blind area can eliminate the problem of the optical fiber vibration positioning blind area caused by Fresnel emission, and have the characteristics of simple structure, low cost and accurate positioning.
Description
Technical Field
The invention relates to the technical fields of optical communication testing and optical fiber sensing, in particular to a single-axis optical fiber interferometer and a positioning device for eliminating an optical fiber vibration blind area.
Background
In maintaining fiber networks, there are commonly used instruments, in addition to Optical Time Domain Reflectometers (OTDR), fiber fault trackers. The optical time domain reflectometer can measure the optical fiber length of the optical fiber fault point, the optical fiber fault tracker can measure the optical fiber length of the optical fiber disturbance point, and the geographic position of the optical fiber fault point can be estimated more accurately by analyzing the difference between the optical fiber lengths of the optical fiber disturbance point and the optical fiber fault point.
According to different disturbance modes to the optical fiber, the current optical fiber fault tracker is mainly based on the following principles: detecting the bending change of the optical fiber by a polarization-optical time domain reflectometer (P-OTDR), and performing distance positioning on the bent optical fiber (Chinese patent CN201410662192.2 is a method for accurately positioning the fault point of the optical fiber); detecting the temperature of the optical fiber by using a Brillouin optical time domain reflectometer (B-OTDR) or a Raman optical time domain reflectometer (R-OTDR), and performing distance positioning on the heating position of the optical fiber; detecting the vibration of the optical fiber by using a phase-optical time domain reflectometer (phi-OTDR), and performing distance positioning on the knocked optical fiber; the differential phase of uniaxial Sagnac fiber interferometer plus OTDR-OTDR is used to detect fiber vibration and to locate the distance at the strike fiber (US 20070264012A1-Identifying or Locating Waveguides).
The accurate location of fiber faults using P-OTDR to detect fiber bend changes has the disadvantage of requiring the ability to bend the fiber around 1m in diameter. If the optical fiber is laid down tightly, and a sufficient length of optical fiber is not drawn for bending, it is difficult to perform bending of the optical fiber, and it becomes very inconvenient to precisely locate the fault of the optical fiber by detecting the bent optical fiber using the P-OTDR. The accurate position location of the optical fiber disturbance point by using B-OTDR, R-OTDR or phi-OTDR has the main disadvantage of too high cost of B-OTDR, R-OTDR or phi-OTDR.
The differential phase-OTDR of the uniaxial Sagnac optical fiber interferometer and the OTDR are adopted to accurately position the disturbance (vibration) point of the optical fiber, so that the cost is moderate and the operation is convenient. However, in the optical fiber, there is fresnel reflection caused by factors such as a connector, a break point, an end face, and the like, and an optical signal generated by fresnel reflection has an intensity that is several orders of magnitude higher than that of a rayleigh scattering signal generated by the optical fiber, and when an optical pulse of the order of microseconds is used to detect a vibration position in the optical fiber, where fresnel reflection occurs, the fresnel reflection signal may completely mask the rayleigh scattering signal, thereby generating a blind area of one to hundreds of meters. The existence of such dead zone seriously affects the positioning accuracy of the vibration position of the optical fiber. Therefore, when the differential phase-OTDR is used to accurately locate the vibration position of the optical fiber, the problem of the vibration locating blind area of the optical fiber caused by fresnel reflection of the optical fiber needs to be solved.
Disclosure of Invention
The invention aims to provide a single-axis optical fiber interferometer and a positioning device for eliminating an optical fiber vibration blind area, which can eliminate the problem of the optical fiber vibration positioning blind area caused by Fresnel emission and have the characteristics of simple structure, low cost and accurate positioning.
In order to achieve the above object, the present invention provides the following solutions:
a single axis fiber optic interferometer comprising: the optical fiber optical system comprises a first optical splitter, a first selector switch, a first optical fiber delay line, a second optical fiber delay line, a short optical fiber and a second optical splitter;
the output end of the first optical splitter is connected with the input end of the first selection switch;
the output end of the first selection switch is respectively connected with one end of the first optical fiber delay line and one end of the second optical fiber delay line;
the other end of the first optical fiber delay line and the other end of the second optical fiber delay line are connected with the input end of the second optical splitter;
the input end of the second optical splitter is connected with the output end of the first optical splitter through a short optical fiber.
Optionally, the single axis optical fiber interferometer includes: a second selection switch;
the other end of the first optical fiber delay line and the other end of the second optical fiber delay line are connected with the input end of the second optical splitter through the second selection switch; the other end of the first optical fiber delay line and the other end of the second optical fiber delay line are connected with the input end of the second selection switch, and the output end of the second selection switch is connected with the input end of the second optical splitter.
Optionally, the first selection switch and the second selection switch are both 1x2 optical switches.
Optionally, the length range of the first optical fiber delay line and the length range of the second optical fiber delay line are both 500 m-20 km.
Optionally, the first optical splitter is a 2x2 optical splitter with a splitting ratio of 50 to 50; the second optical splitter is a 1x2 optical splitter with a 50 to 50 splitting ratio.
A positioning device for eliminating a vibration blind area of an optical fiber, comprising: the single-axis optical fiber interferometer, the optical pulse transmitter and the optical pulse receiver;
the output end of the optical pulse transmitter is connected with the input end of a first optical splitter in the single-axis optical fiber interferometer;
the input end of the optical pulse receiver is connected with the output end of a first optical splitter in the single-axis optical fiber interferometer;
the output end of the single-axis optical fiber interferometer is connected with the tested optical fiber.
Optionally, the value of the length difference between the first optical fiber delay line and the second optical fiber delay line in the uniaxial optical fiber interferometer is greater than one fifth of the value of the width of the optical pulse emitted by the optical pulse emitter.
Optionally, the range of the optical pulse width value of the optical pulse transmitter is 50 ns-5000 ns.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the single-axis optical fiber interferometer provided by the invention can form a novel single-axis optical fiber interferometer with a simpler structure by adopting the first optical fiber delay line and the second optical fiber delay line which are different in length. In the process of positioning the optical fiber vibration part by adopting the device formed by the novel single-axis optical fiber interferometer, when the lengths of the optical fiber delay lines selected by the selector switch are different in different time periods, the positions of optical fiber vibration measurement dead zones caused by Fresnel reflection points in the measured optical fiber are also different, so that when the optical fiber vibration is measured in different measurement time periods, the measured dead zone positions are different, and then, the influence of inaccurate positioning caused by the optical fiber vibration measurement dead zones caused by the Fresnel reflection effect can be eliminated by screening and calculating the measured results in different time periods.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a uniaxial optical fiber interferometer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a device for eliminating a fiber vibration positioning blind area according to an embodiment of the invention;
FIG. 3 is a graph of fiber vibration positioning data obtained using the prior art;
FIG. 4 is a graph of data obtained using the prior art for fiber vibration locating dead zones;
fig. 5 is a graph of optical fiber vibration positioning data obtained by the device for eliminating optical fiber vibration positioning blind area provided by the invention.
Reference numerals: the optical fiber interferometer comprises a 1-single-axis optical fiber interferometer, a 11-first optical splitter, a 12-first selection switch, a 13-first optical fiber delay line, a 14-second optical fiber delay line, a 15-short optical fiber, a 16-second optical splitter, a 17-second selection switch, a 2-optical pulse transmitter, a 3-optical pulse receiver and a 4-measured optical fiber.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a single-axis optical fiber interferometer and a positioning device for eliminating an optical fiber vibration blind area, which can eliminate the problem of the optical fiber vibration positioning blind area caused by Fresnel emission and have the characteristics of simple structure, low cost and accurate positioning.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
FIG. 1 is a schematic structural diagram of a uniaxial optical fiber interferometer according to an embodiment of the present invention, as shown in FIG. 1, a uniaxial optical fiber interferometer includes: the optical fiber delay line comprises a first optical splitter 11, a first selector switch 12, a first optical fiber delay line 13, a second optical fiber delay line 14, a short optical fiber 15 and a second optical splitter 16.
The output end of the first optical splitter 11 is connected to the input end of the first selection switch 12.
The output end of the first selector switch 12 is connected to one end of the first optical fiber delay line 13 and one end of the second optical fiber delay line 14, respectively.
The other end of the first optical fiber delay line 13 and the other end of the second optical fiber delay line 14 are both connected with the input end of the second optical splitter 16.
The input end of the second optical splitter 16 is connected to the output end of the first optical splitter 11 through a short optical fiber 15.
The single axis fiber interferometer may also include a second selector switch 17.
The other end of the first optical fiber delay line 13 and the other end of the second optical fiber delay line 14 are connected with the input end of the second optical splitter 16 through the second selection switch 17. The other end of the first optical fiber delay line 13 and the other end of the second optical fiber delay line 14 are connected with the input end of the second selection switch 17, and the output end of the second selection switch 17 is connected with the input end of the second optical splitter 16.
The first selection switch 12 and the second selection switch 17 are 1x2 optical switches.
The length range of the first optical fiber delay line 13 and the length range of the second optical fiber delay line 14 are 500 m-20 km. The length of the first optical fiber delay line is preferably 5.0km, and the length of the second optical fiber delay line is preferably 2.5km. The length of the first and second optical fiber delay lines should be selected taking into account the light emission pulse width used in the apparatus provided by the present invention and the duration of the light receiver from entering saturation to completely exiting saturation.
The first optical splitter 11 is a 2x2 optical splitter with a 50 to 50 splitting ratio. The second optical splitter 16 is a 1x2 optical splitter with a 50 to 50 splitting ratio.
As shown in fig. 2, the positioning device for eliminating a fiber vibration blind area provided by the invention comprises: the uniaxial optical fiber interferometer 1, the optical pulse transmitter 2, and the optical pulse receiver 3 configured as described above.
The output end of the optical pulse transmitter 2 is connected with the input end of a first optical splitter 11 in the single-axis optical fiber interferometer 1.
The input end of the optical pulse receiver 3 is connected with the output end of the first optical splitter 11 in the single-axis optical fiber interferometer 1.
The output end of the uniaxial optical fiber interferometer 1 is connected with the measured optical fiber 4.
The difference in length between the first fiber delay line 13 and the second fiber delay line 14 in the uniaxial fiber interferometer 1 is greater than one fifth of the value of the width of the optical pulse (in nanoseconds) emitted by the optical pulse transmitter 2, wherein the numerical relationship between the two values is independent of the numerical units adopted by the two values.
The optical pulse width value of the optical pulse transmitter 2 ranges from 50ns to 5000ns.
In the device of the present invention, the optical pulse transmitter 2 employs a light source of the type F-P LD or SLD having an operating wavelength of either 1310nm band, 1490 band or 1550nm C band, 1550nm L band or 1625nm band. The operating wavelength is preferably in the C-band of 1550 nm.
The detector used by the optical pulse receiver 3 is an APD or PIN.
The specific working principle of the device for eliminating the optical fiber vibration positioning blind area for optical fiber vibration positioning provided by the invention is as follows:
in order to avoid the influence of the fiber vibration dead zone in the process of positioning the fiber vibration position, the optical pulse transmitter 2 generates an optical pulse signal, and then transmits the generated optical pulse signal to the single-axis optical fiber interferometer 1, and then the optical pulse signal enters the tested optical fiber 4. The back scattering signal and the reflected signal in the measured optical fiber 4 enter the uniaxial optical fiber interferometer 1 and then enter the optical pulse receiver 3.
In the whole optical fiber vibration positioning process, selecting optical fiber delay lines (a first optical fiber delay line or a second optical fiber delay line) with different lengths in different measurement time periods through a selection switch (a first selection switch and a second selection switch); when the lengths of the optical fiber delay lines of the uniaxial optical fiber interferometers are different, the positions of optical fiber vibration measurement dead zones caused by Fresnel reflection points in the measured optical fibers are different, so that the positions of the measurement dead zones are also different when the optical fiber vibration is measured in different measurement time periods. When the length difference of the two optical fiber delay lines is large enough, the measurement dead zones are not overlapped; after the measurement results in the two time periods are screened and calculated, the influence of inaccurate positioning caused by the optical fiber vibration measurement blind area due to the Fresnel reflection effect can be eliminated.
The specific operation process for eliminating the measurement blind area caused by the Fresnel reflection of the optical fiber by adopting the device provided by the invention comprises the following steps:
dividing one measurement time into two time periods, and ensuring that the optical fiber is vibrated more than once in each measurement time by adopting a mode of knocking the optical fiber;
in a first measurement time period, controlling a selection switch, and connecting a first optical fiber delay line into the single-axis optical fiber interferometer; after the optical pulse transmitter transmits the optical pulse signal each time, 1 frame of optical fiber back scattering and back reflection signal data D is obtained by the optical pulse receiver K1 The method comprises the steps of carrying out a first treatment on the surface of the Subtracting two adjacent frames of data, namely: ΔD of K1 ＝D K1+1 -D K1 The method comprises the steps of carrying out a first treatment on the surface of the Curve display of a signal data sequence DeltaD K1 The Y-axis represents the variation in the amplitude of the backscattered signal and the X-axis represents the length of the fiber; calculating the data sequence DeltaD from the origin of coordinates by forward point-by-point displacement K1 When the signal data sequence delta D K1 The occurrence of Y value in (a) being greater than a set threshold Y t1 Recording the point on the curve, and calculating the displacement from the point to the coordinate originWhen the slope of the line changes from positive value to negative value (or zero), the point corresponds to the vibration position of the optical fiber, and the value of the X axis of the point is subtracted by half of the length value of the first optical fiber delay line to obtain a value S 1 The optical length value of the optical fiber from the vibration position of the optical fiber to the measuring device;
in a second measurement time period, controlling a selection switch, and connecting a second optical fiber delay line into the single-axis optical fiber interferometer; after the optical pulse transmitter transmits the optical pulse signal each time, 1 frame of optical fiber back scattering and back reflection signal data D is obtained by the optical pulse receiver K2 The method comprises the steps of carrying out a first treatment on the surface of the Subtracting two adjacent frames of data, namely: ΔD of K2 ＝D K2+1 -D K The method comprises the steps of carrying out a first treatment on the surface of the Curve display of a signal data sequence DeltaD K2 The Y-axis represents the variation in the amplitude of the backscattered signal and the X-axis represents the length of the fiber; calculating the data sequence DeltaD from the origin of coordinates by forward point-by-point displacement K2 When the signal data sequence delta D K2 The occurrence of Y value in (a) being greater than a set threshold Y t2 When the slope of the curve at a certain point on the curve is changed from a positive value to a negative value (or zero), the point corresponds to the vibration position of the optical fiber, and the value of the X-axis of the point is subtracted by half of the length value of the delay line of the second optical fiber to obtain a value S 2 The optical length value of the optical fiber from the vibration position of the optical fiber to the measuring device; the method comprises the steps of carrying out a first treatment on the surface of the
Comparison S 1 And S is 2 The value with small value is the length value of the delay fiber from the final fiber vibration position to the measuring device.
The measurement time of the two measurement periods is 1s to 180s, preferably 10s. Set threshold Y t1 And a set threshold Y t2 The value ranges are all 0.05-0.2 dB.
In addition, the advantages of the device provided by the invention are further verified by combining the test data curves, and the advantages are as follows:
fig. 3 shows two sets of data obtained by subtracting OTDR data frame signals using a uniaxial optical fiber interferometer provided in the prior art, where series 1 is a data set when there is no vibration on an optical fiber, and series 2 is a data set when there is vibration on an optical fiber. From the series 2 data set it is also known that the vibration occurs at point a and the end of the measured fiber at point e.
If the end of the measured optical fiber is flat, stronger Fresnel reflection is generated, the reflectivity can reach 15dB, the scattering rate of the optical fiber is only about 50dB (1550 nm wavelength, 1 microsecond of the light pulse width), and the optical signal level is different by 35dB. For an amplifier of an optical pulse receiver, in order to normally receive a scattered signal of an optical fiber, a certain gain is required, and when a strong fresnel reflection signal is received, an amplifying circuit enters a saturated state. The signal values obtained via the a/D circuit do not change during the time that the circuit is in saturation, meaning that the signal saturation period is a dead zone.
Shown in fig. 4 is data obtained by differential phase-OTDR of a single fiber delay line with a strong fresnel reflection at the end of the fiber under test. It can be seen that the values from point b to point c are all 0. If the vibration generating position a is unfortunately between the point b and the point c, although the vibration on the optical fiber can still be judged, the accurate value of the point a cannot be determined.
In the first measurement period of the vibration position of the optical fiber by adopting the device provided by the invention, the vibration positioning data curve is shown as a series 1 in fig. 5; in a second measuring period, a vibration positioning data curve such as
Shown in series 2 in fig. 5. The blind area of the series 1 curve is b-c, the blind area of the series 2 curve is b '-c', and the b-c area and the b '-c' area are not overlapped. So if the fiber vibration point a falls into the b-c region, it does not fall into the b '-c' region; conversely, if the fiber vibration point a falls within the b '-c' region, it does not fall within the b-c region. Therefore, after the measurement results of the first measurement period and the second measurement period are combined and screened, the finally obtained measurement result of the position of the vibration point of the optical fiber is not influenced by Fresnel reflection existing in the optical fiber.
The single-axis optical fiber interferometer provided by the invention can form a novel single-axis optical fiber interferometer with a simpler structure by adopting the first optical fiber delay line and the second optical fiber delay line which are different in length. In the process of positioning the optical fiber vibration part by adopting the device formed by the novel single-axis optical fiber interferometer, when the lengths of the optical fiber delay lines selected by the selector switch are different in different time periods, the positions of optical fiber vibration measurement dead zones caused by Fresnel reflection points in the measured optical fiber are also different, so that when the optical fiber vibration is measured in different measurement time periods, the measured dead zone positions are different, and then, the influence of inaccurate positioning caused by the optical fiber vibration measurement dead zones caused by the Fresnel reflection effect can be eliminated by screening and calculating the measured results in different time periods.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. The utility model provides a eliminate positioner of optic fibre vibration blind area which characterized in that includes: a single axis optical fiber interferometer, an optical pulse transmitter and an optical pulse receiver;
the single axis optical fiber interferometer includes: the optical fiber system comprises a first optical splitter, a first selector switch, a first optical fiber delay line, a second optical fiber delay line, a short optical fiber, a second optical splitter and a second selector switch; the length of the first optical fiber delay line is different from the length of the second optical fiber delay line;
the output end of the optical pulse transmitter is connected with the input end of the first optical divider; the first output end of the first optical splitter is connected with the input end of the first selection switch; the first output end of the first selection switch is connected with one end of the first optical fiber delay line; the second output end of the first selection switch is connected with one end of the second optical fiber delay line; the other end of the first optical fiber delay line is connected with the first input end of the second selection switch; the other end of the second optical fiber delay line is connected with a second input end of the second selection switch; the output end of the second selection switch is connected with the first input end of the second optical splitter; the second output end of the first optical splitter is connected with the second input end of the second optical splitter through a short optical fiber; the input end of the optical pulse receiver is connected with the third output end of the first optical divider; the output end of the second optical splitter is used as the output end of the single-axis optical fiber interferometer to be connected with the tested optical fiber;
the length range of the first optical fiber delay line and the length range of the second optical fiber delay line are 500-20 km; the first optical splitter is a 2x2 optical splitter with 50-50 of splitting ratio; the second optical splitter is a 1x2 optical splitter with a 50 to 50 splitting ratio.
2. The positioning device for eliminating a vibration blind area of an optical fiber according to claim 1, wherein the first selection switch and the second selection switch are 1x2 optical switches.
3. The positioning device for eliminating fiber vibration dead zone according to claim 1, wherein the value of the length difference between the first fiber delay line and the second fiber delay line in the uniaxial fiber interferometer is greater than one fifth of the value of the width of the optical pulse emitted by the optical pulse transmitter.
4. The positioning device for eliminating a vibration blind area of an optical fiber according to claim 1, wherein the range of the optical pulse width value of the optical pulse transmitter is 50 ns-5000 ns.
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