CN110518970B - 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
- Publication number
- CN110518970B CN110518970B CN201910885691.0A CN201910885691A CN110518970B CN 110518970 B CN110518970 B CN 110518970B CN 201910885691 A CN201910885691 A CN 201910885691A CN 110518970 B CN110518970 B CN 110518970B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- optical
- delay line
- vibration
- interferometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 204
- 230000003287 optical effect Effects 0.000 claims abstract description 92
- 239000000835 fiber Substances 0.000 description 32
- 238000005259 measurement Methods 0.000 description 25
- 238000000034 method Methods 0.000 description 8
- 238000000253 optical time-domain reflectometry Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- 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]
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (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 first optical splitter, the first optical fiber delay line, the second optical fiber delay line, the short optical fiber, the second optical splitter and the selection switch are used for selecting whether the used optical fiber delay line is the first optical fiber delay line or the used optical fiber delay line is the first optical fiber delay line and the second optical fiber delay line is connected in series, and the connection relation among all the components is provided. The invention also provides a positioning device for eliminating the vibration blind area of the optical fiber by adopting the uniaxial optical fiber interferometer. The single-axis optical fiber interferometer and the positioning device for eliminating the optical fiber vibration blind area can eliminate the influence of the optical fiber vibration blind area on the optical fiber vibration positioning caused by Fresnel reflection, improve the accuracy of the optical fiber vibration positioning, and have the characteristics of simple structure and low cost.
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 (China patent CN201410662192.2, 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 vibration of the optical fiber is detected by adopting a differential phase-OTDR of a uniaxial Sagnac optical fiber interferometer and an OTDR, and the distance positioning is carried out on the position of the knocked optical fiber (U.S. Pat. No. 3, 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 uniaxial optical fiber interferometer and a positioning device for eliminating an optical fiber vibration blind area, which can eliminate the influence of the optical fiber vibration blind area on the optical fiber vibration positioning caused by Fresnel reaction, improve the accuracy of the optical fiber vibration positioning and have the characteristics of simple structure and low cost.
In order to achieve the above object, the present invention provides the following solutions:
A single axis fiber optic interferometer comprising: the optical fiber delay line comprises a first optical splitter, a first optical fiber delay line, a second optical fiber delay line, a short optical fiber, a second optical splitter and a selection switch, wherein the selection switch is used for selecting whether the used optical fiber delay line is the first optical fiber delay line or the first optical fiber delay line is connected with the second optical fiber delay line in series;
the output end of the first optical splitter is connected with one end of the first optical fiber delay line;
the other end of the first optical fiber delay line is connected with the first input end of the selection switch;
the second input end of the selection switch is connected with the second output end of the selection switch through the second optical fiber delay line;
The first output end of the selection switch is connected with the input end of the second optical divider;
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 selection switch is a 2x2 optical switch.
Optionally, the length range of the first optical fiber time delay line and the length range of the second optical fiber time 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 length value of the second fiber delay line in the uniaxial fiber optic interferometer is greater than one fifth of the width value of the light pulse emitted by the light pulse emitter.
Optionally, the range of the optical pulse width value of the optical pulse transmitter is 50 ns-5000 ns.
Optionally, the optical pulse transmitter emits optical pulses with a period ranging from 0.1ms to 2ms.
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 has the advantages that the length of the optical fiber delay line is selected by adopting the selection switch, the structure is simpler, the measurement is carried out only by changing the length of the optical fiber delay line, and the operation cost is lower. And based on this unipolar fiber interferometer, in the in-process of fixing a position to the fiber vibration position, when the length of the fiber delay line that passes through the selector switch and select in different time slots, the fiber vibration that fresnel reflection point arouses in the measured optical fiber measures the position of blind area also different, therefore when measuring fiber vibration in different measurement time slots, the blind area position of measuring is different, then through screening and calculating the result of measuring in different time slots, just can eliminate the influence that leads to the location inaccuracy because of the fiber vibration that fresnel reflection effect arouses measures the blind area.
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 optical fiber delay line, a 13-second optical fiber delay line, a 14-short optical fiber, a 15-second optical splitter, a 16-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 uniaxial optical fiber interferometer and a positioning device for eliminating an optical fiber vibration blind area, which can eliminate the influence of the optical fiber vibration blind area on the optical fiber vibration positioning caused by Fresnel reaction, improve the accuracy of the optical fiber vibration positioning and have the characteristics of simple structure and low cost.
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: a first optical splitter 11, a first optical fiber delay line 12, a second optical fiber delay line 13, a short optical fiber 14, a second optical splitter 15, and a selection switch 16 for selecting whether the optical fiber delay line used is the first optical fiber delay line 12 or the first optical fiber delay line 12 in series with the second optical fiber delay line 13;
the output end of the first optical splitter 11 is connected with one end of the first optical fiber delay line 12;
the other end of the first optical fiber delay line 12 is connected with a first input end of the selection switch 16;
A second input end of the selection switch 16 is connected with a second output end of the selection switch 16 through the second optical fiber delay line 13;
a first output end of the selection switch 16 is connected with an input end of the second optical splitter 15;
the input end of the second optical splitter 15 is connected to the output end of the first optical splitter 11 through a short optical fiber 14.
Wherein the selection switch 16 used in the present invention is a 2x2 optical switch.
The length range of the first optical fiber time delay line and the length range of the second optical fiber time delay line are 500 m-20 km.
The first optical splitter 11 is a 2x2 optical splitter with a 50 to 50 splitting ratio; the second optical splitter 15 is a 1x2 optical splitter with a 50 to 50 splitting ratio.
As shown in FIG. 2, the invention also provides a positioning device for eliminating the vibration blind area of the optical fiber. The device comprises: the single-axis optical fiber interferometer 11, the optical pulse transmitter 2 and the optical pulse receiver 3;
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 a 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 length value (in meters) of the second fiber delay line in the uniaxial fiber interferometer 1 is greater than one fifth of the width value (in nanoseconds) of the optical pulse emitted by the optical pulse emitter 2, wherein the numerical association between the two values is only numerical and is irrelevant to the numerical units adopted by the two values.
The optical pulse width value of the optical pulse transmitter 2 ranges from 50ns to 5000ns. The optical pulse transmitter 2 emits optical pulses with a period in the range of 0.1ms-2ms.
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 K1 is obtained by the optical pulse receiver; subtracting two adjacent frames of data, namely: Δd K1＝DK1+1-DK1; the display signal data sequence DeltaD K1 is performed in a curve manner, the Y axis represents the change of the amplitude of the back scattering signal, and the X axis represents the length of the optical fiber; calculating a data sequence delta D K1 by forward point-by-point displacement from the origin of coordinates, recording the point on a curve when the Y value in the signal data sequence delta D K1 is larger than a set threshold Y t1, performing point-by-point displacement and calculation from the point to the origin of coordinates, 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, the value of the X axis of the point is subtracted by half of the length value of the first optical fiber delay line, and the obtained value S 1 is the optical length value of the optical fiber from the vibration position of the optical fiber to a 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 K2 is obtained by the optical pulse receiver; subtracting two adjacent frames of data, namely: Δd K2＝DK2+1-DK; the display signal data sequence DeltaD K2 is performed in a curve manner, the Y axis represents the change of the amplitude of the back scattering signal, and the X axis represents the length of the optical fiber; calculating a data sequence delta D K2 by forward point-by-point displacement from the origin of coordinates, recording a point on a curve when the Y value in the signal data sequence delta D K2 is larger than a set threshold Y t2, performing point-by-point displacement and calculation from the point to the origin of coordinates, 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, the value of the X axis of the point is subtracted by half of the length value of the second optical fiber delay line, and the obtained value S 2 is the optical length value of the optical fiber from the vibration position of the optical fiber to a measuring device;
Comparing the sizes of S 1 and S 2, wherein the value with the small value is the length value of the delay optical fiber from the final optical fiber vibration position to the measuring device.
The measurement time of the two measurement periods is 1s to 180s, preferably 10s. The value ranges of the set threshold Y t1 and the set threshold Y t2 are 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 occurrence position a is unfortunately between the point b and the point c, although the vibration occurrence on the optical fiber can still be judged at this time, 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 the second measurement period, the vibration positioning data curve is shown as 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 has the advantages that the length of the optical fiber delay line is selected by adopting the selection switch, the structure is simpler, the measurement is carried out only by changing the length of the optical fiber delay line, and the operation cost is lower. And based on this unipolar fiber interferometer, in the in-process of fixing a position to the fiber vibration position, when the length of the fiber delay line that passes through the selector switch and select in different time slots, the fiber vibration that fresnel reflection point arouses in the measured optical fiber measures the position of blind area also different, therefore when measuring fiber vibration in different measurement time slots, the blind area position of measuring is different, then through screening and calculating the result of measuring in different time slots, just can eliminate the influence that leads to the location inaccuracy because of the fiber vibration that fresnel reflection effect arouses measures the blind area.
In the positioning device for eliminating the optical fiber vibration blind area, the single-axis optical fiber interferometer can be used for forming the differential phase-OTDR, so that in the process of positioning the optical fiber vibration position, the influence of positioning inaccuracy caused by the optical fiber vibration measurement blind area due to the Fresnel reflection effect can be eliminated with low cost, and the positioning accuracy of the optical fiber vibration position is improved.
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. A positioning device for eliminating a vibration blind area of an optical fiber, comprising: a single axis optical fiber interferometer, an optical pulse transmitter, and an optical pulse receiver;
the single axis optical fiber interferometer comprises: the optical fiber delay line comprises a first optical splitter, a first optical fiber delay line, a second optical fiber delay line, a short optical fiber, a second optical splitter and a selection switch, wherein the selection switch is used for selecting whether the used optical fiber delay line is the first optical fiber delay line or the first optical fiber delay line is connected with the second optical fiber delay line in series;
the first output end of the first optical splitter is connected with one end of the first optical fiber delay line;
the other end of the first optical fiber delay line is connected with the first input end of the selection switch;
the second input end of the selection switch is connected with the second output end of the selection switch through the second optical fiber delay line;
The first output end of the selection switch is connected with the input end of the second optical divider;
the input end of the second optical splitter is connected with the second output end of the first optical splitter through a short 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 output end of the optical pulse transmitter is connected with the input end of the first optical divider;
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 divider is used as the output end of the single-axis optical fiber interferometer and is connected with the tested optical fiber;
the range of the optical pulse width value of the optical pulse transmitter is 50 ns-5000 ns.
2. The positioning device for eliminating vibration dead zone of optical fiber according to claim 1, wherein the period range of the light pulse emitted by the light pulse emitter is 0.1ms-2ms.
3. The positioning device for eliminating vibration dead zone of optical fiber according to claim 1, wherein the selection switch is a 2x2 optical switch.
4. The positioning device for eliminating vibration dead zone of optical fiber according to claim 1, wherein 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910885691.0A CN110518970B (en) | 2019-09-19 | 2019-09-19 | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910885691.0A CN110518970B (en) | 2019-09-19 | 2019-09-19 | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110518970A CN110518970A (en) | 2019-11-29 |
| CN110518970B true CN110518970B (en) | 2024-05-10 |
Family
ID=68632841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910885691.0A Active CN110518970B (en) | 2019-09-19 | 2019-09-19 | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110518970B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635339A (en) * | 2005-01-01 | 2005-07-06 | 复旦大学 | Full optical fiber positioning and monitoring method and system therefor |
| CN101021597A (en) * | 2007-02-16 | 2007-08-22 | 浙江大学 | Micro phase delay capacity light delay linear array switch |
| CN101441092A (en) * | 2008-10-16 | 2009-05-27 | 北京邮电大学 | Perimeter protection sensing positioning system based on coherent light time domain reflection |
| CN104215319A (en) * | 2014-09-01 | 2014-12-17 | 安徽大学 | Dynamic range adjustable differential interferometer and measuring method |
| CN210405317U (en) * | 2019-09-19 | 2020-04-24 | 桂林聚联科技有限公司 | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area |
-
2019
- 2019-09-19 CN CN201910885691.0A patent/CN110518970B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635339A (en) * | 2005-01-01 | 2005-07-06 | 复旦大学 | Full optical fiber positioning and monitoring method and system therefor |
| CN101021597A (en) * | 2007-02-16 | 2007-08-22 | 浙江大学 | Micro phase delay capacity light delay linear array switch |
| CN101441092A (en) * | 2008-10-16 | 2009-05-27 | 北京邮电大学 | Perimeter protection sensing positioning system based on coherent light time domain reflection |
| CN104215319A (en) * | 2014-09-01 | 2014-12-17 | 安徽大学 | Dynamic range adjustable differential interferometer and measuring method |
| CN210405317U (en) * | 2019-09-19 | 2020-04-24 | 桂林聚联科技有限公司 | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110518970A (en) | 2019-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110518969B (en) | Optical cable vibration positioning device and method | |
| US9709460B2 (en) | Method and system for measuring an optical loss value of an optical fiber link | |
| CN102739311B (en) | Fiber failure positioner and localization method thereof based on chaos visible laser | |
| US9310274B2 (en) | System and method for measuring fiber temperature using OTDR measurements | |
| JP4008470B2 (en) | Measuring method and apparatus for measuring polarization mode dispersion of optical fiber | |
| CN108627317A (en) | Optical fiber test method, equipment and system | |
| JP5037506B2 (en) | Fiber PMD evaluation method using composite POTDR trace | |
| US8400622B2 (en) | Enhanced OTDR sensitivity by utilizing mode-field diameter measurements | |
| KR20140051495A (en) | Method for improving optical time domain reflectometer(otdr) performance | |
| CA2108801A1 (en) | Method for finding and measuring optical features using an optical time domain reflectometer | |
| JP3147616B2 (en) | Distributed waveguide sensor | |
| EP3465125B1 (en) | Otdr with increased precision and reduced dead zone using superposition of pulses with varying clock signal delay | |
| CN110518967B (en) | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area | |
| CN210183335U (en) | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area | |
| CN210405317U (en) | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area | |
| CN110518970B (en) | Single-axis optical fiber interferometer and positioning device for eliminating optical fiber vibration blind area | |
| CN210327579U (en) | Optical cable vibrating positioning device | |
| CN210444271U (en) | Optical cable vibrating positioning device | |
| US7317518B2 (en) | Determination of an optical property of a DUT by OTDR measurement | |
| CN110518968B (en) | Optical cable vibration positioning device and method | |
| CN115452015A (en) | Double-scale reference interference phase noise accurate correction optical frequency domain reflectometer | |
| JP6706192B2 (en) | Propagation delay time difference measuring method between spatial channels and propagation delay time difference measuring apparatus between spatial channels | |
| RU44389U1 (en) | OPTICAL INTEGRATING REFLECTOMETER | |
| JPH06167424A (en) | Light pulse tester | |
| Parpiev et al. | DIAGNOSIS OF THE CONDITION OF OPTICAL-LINE LINES ON THE BASIS OF IMPULSIVE OPTICAL REFLEKTOMETER |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |