CN114039661A - Optical fiber bearing service identification method - Google Patents
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- CN114039661A CN114039661A CN202111307886.0A CN202111307886A CN114039661A CN 114039661 A CN114039661 A CN 114039661A CN 202111307886 A CN202111307886 A CN 202111307886A CN 114039661 A CN114039661 A CN 114039661A
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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
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
Abstract
The invention provides a method for identifying an optical fiber bearing service. The method comprises the following steps: controlling the bending of the optical fiber to be tested to radiate a part of optical signals to the outside of the optical fiber to be tested; detecting two different optical signals radiated from the bent part of the optical fiber to be detected at different time points; determining Rayleigh scattered light signals in the two optical signals according to the relative intensity of the two optical signal intensities; demodulating and differentiating two Rayleigh scattered light signals detected at adjacent time points to obtain differential signals; and identifying the type of the bearing service of the optical fiber to be tested according to the characteristics of the differential signal. The method can identify any position of the optical fiber to be detected under the condition of not cutting off the normal communication of the optical fiber, and has important practical values for improving the operation and maintenance efficiency of the optical cable and reducing the potential safety hazard.
Description
Technical Field
The invention relates to the technical field of optical cables, in particular to an optical fiber bearer service identification method.
Background
The information communication technology occupies a great position in the development and application of the energy Internet, and an information and communication system is an important support for the construction of the energy Internet. Fiber optic cables are an important carrier medium for digital communications, are deployed on a large scale at speeds of billions of kilometers per year and play a difficult role in current communication systems. Along with the large-scale construction and application of the optical cable, efficient and accurate operation, maintenance and management means are important guarantees for ensuring the safe operation of the optical cable and playing the communication effect of the optical cable, so that the effective solution for fast identifying the optical cable is researched for improving the operation and maintenance efficiency of the optical cable and reducing the potential safety hazard in the face of various cross current situations of basic optical cables constructed in different periods and different reasons in actual operation and difficult problems and hidden dangers brought to the operation and maintenance.
At present, most of optical cable identity recognition adopts a mode of installing an electronic tag, although the installation operation is simple, the identification can be carried out only at specific installation positions of the optical cable, such as two ends of an optical fiber, and certain limitation is realized.
Disclosure of Invention
The present invention is directed to a method for identifying an optical fiber bearer service, which can solve at least one of the above-mentioned problems. The specific scheme is as follows:
the invention provides a method for identifying an optical fiber bearing service, which comprises the following steps: controlling the bending of the optical fiber to be tested to radiate a part of optical signals to the outside of the optical fiber to be tested; detecting two different optical signals radiated from the bent part of the optical fiber to be detected at different time points; determining Rayleigh scattered light signals in the two optical signals according to the relative intensity of the two optical signal intensities; demodulating and differentiating two Rayleigh scattered light signals detected at adjacent time points to obtain differential signals; and identifying the type of the bearing service of the optical fiber to be tested according to the characteristics of the differential signal.
Optionally, the controlling the bending of the optical fiber to be tested to radiate a part of the optical signal to the outside of the optical fiber to be tested includes:
when the optical fiber to be detected is in a working state, transmitting an optical signal along the optical fiber to be detected, controlling the optical fiber to be detected to bend, and radiating part of the transmitted optical signal outside the optical fiber at the bent part of the optical fiber to be detected; at the same time, the user can select the desired position,
and the residual transmission optical signal is continuously transmitted along the optical fiber to be detected, a Rayleigh scattering optical signal opposite to the transmission optical signal is generated in the optical fiber, and part of the Rayleigh scattering optical signal is radiated outside the optical fiber.
Optionally, the detecting, at different time points, two different optical signals radiated from the bending portion of the optical fiber to be detected includes:
a first optical detector and a second optical detector are respectively arranged on the transmission path of the optical fiber to be detected and on two sides of the bent part;
detecting a first optical signal radiated to the outside of the optical fiber to be detected by using the first optical detector; and detecting a second optical signal radiated to the outside of the optical fiber to be detected by using the second optical detector.
Optionally, the first light detector and the second light detector are respectively located on two different planes, and an included angle formed by the two different planes is 150 ° to 170 °.
Optionally, the first light detector and the second light detector are both photosensitive detectors.
Optionally, the determining the rayleigh scattered light signal in the two optical signals according to the relative magnitude of the intensities of the two optical signals includes:
respectively and correspondingly converting the two optical signals into two preprocessing electric signals;
respectively carrying out nonlinear amplification and analog-to-digital conversion processing on the two preprocessed electric signals in sequence to obtain two electric signals;
and performing difference processing on the two electrical signals to determine an optical signal with small corresponding light intensity in the two electrical signals, wherein the optical signal is a Rayleigh scattered light signal.
Optionally, before the demodulating and differentiating the two rayleigh scattered light signals detected at adjacent time points to obtain a differential signal, the method further includes:
according to the determined Rayleigh scattered light signals, further determining a target light detector used for detecting Rayleigh scattered light signals in the first light detector and the second light detector;
and acquiring two Rayleigh scattered light signals detected by the target light detector at different time points.
Optionally, the demodulating and differentiating two rayleigh scattered light signals detected at adjacent time points to obtain a differential signal includes:
respectively carrying out digital orthogonal demodulation on two Rayleigh scattered light signals detected at adjacent time points to obtain two Rayleigh scattered light signal amplitudes;
and carrying out differential processing on the amplitudes of the two Rayleigh scattering optical signals to obtain a differential signal.
Optionally, the identifying, according to the differential signal, the type of the bearer service of the optical fiber to be tested includes:
and if the differential signal shows a periodic pulse rule, identifying the optical fiber to be detected as the optical fiber for sensing.
Optionally, the identifying, according to the characteristic of the differential signal, the type of the bearer service of the optical fiber to be tested further includes:
and if the differential signal does not show a periodic pulse rule, identifying the optical fiber to be detected as a communication optical fiber.
Compared with the prior art, the scheme of the embodiment of the invention at least has the following beneficial effects:
firstly, the method for identifying the optical fiber bearing service is based on the lossless optical fiber bending coupling principle, bends any position of an optical fiber to be detected, is not limited by an identification position, and expands application scenes;
secondly, the purpose of the optical fiber can be analyzed on the premise of not damaging or influencing the operation of the optical fiber, and the optical fiber analysis method has important practical values for improving the operation and maintenance efficiency of the optical cable and reducing potential safety hazards;
thirdly, the detection is carried out under the condition of not cutting off the optical fiber communication, the influence on the optical fiber communication system is greatly reduced, and the method has the advantages of low cost, high efficiency and detection of any optical fiber position.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 shows a flowchart of a method for identifying an optical fiber bearer service according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for detecting two different optical signals radiated from a bend of the optical fiber to be detected at different time points according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating detection of a portion of an optical signal radiated away in an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for determining a rayleigh scattered light signal of the two optical signals according to the relative magnitude of the intensities of the two optical signals, provided in the embodiment of the present invention;
fig. 5 is a block diagram illustrating a signal processing system according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a method for demodulating and differentiating two rayleigh scattered light signals detected at adjacent time points to obtain a differential signal according to an embodiment of the present invention;
fig. 7 shows a schematic diagram of differential signals between the communication optical fiber and the sensing optical fiber according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe embodiments of the present invention, they should not be limited to these terms.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
The contents of the above embodiments will be described with reference to an alternative embodiment.
Example 1
An embodiment of the present invention provides a method for identifying an optical fiber bearer service, and fig. 1 shows a flowchart of the method for identifying an optical fiber bearer service. As shown in fig. 1, the method for identifying an optical fiber bearer service includes:
s10, controlling the bending of the optical fiber to be tested, and radiating part of optical signals to the outside of the optical fiber to be tested;
in this step, the optical fiber internal spectroscopic signal is radiated to the outside based on the lossless optical fiber bending coupling principle. Specifically, the bending coupling principle of the lossless optical fiber is that any mechanical device is utilized to properly bend the optical fiber, so that the light originally in the fiber core does not satisfy the total reflection condition any more, and bending loss is generated, and part of the light is radiated to the outside of the optical fiber, but the normal transmission of the optical fiber is not influenced. The energy of the radiated optical signal depends on the bending curvature radius or the bending included angle, and the characteristic of the radiated optical signal is the same as that of the signal in the fiber core.
In the practical application process, when the optical fiber to be detected is in a working state, transmitting optical signals along the optical fiber to be detected, controlling the optical fiber to be detected to bend, and radiating part of the transmitted optical signals outside the optical fiber at the bent part of the optical fiber to be detected; meanwhile, the residual transmission optical signal is continuously transmitted along the optical fiber to be detected, a Rayleigh scattering optical signal opposite to the transmission optical signal is generated in the optical fiber, and part of the Rayleigh scattering optical signal is radiated outside the optical fiber. In this embodiment, the bending curvature radius of the optical fiber to be measured is 5mm to 10mm, and at this time, the bending loss due to bending is negligible, and the optical fiber to be measured is considered to be still in a normal working state. Wherein, the bending curvature radius refers to the bending degree of the optical fiber to be measured.
S20, detecting two different optical signals radiated from the bent part of the optical fiber to be detected at different time points;
in this step, the two different optical signals, i.e., the transmission optical signal and the rayleigh scattering optical signal, radiated to the outside of the optical fiber are mainly detected. As an alternative embodiment of the present invention, as shown in fig. 2 to 3, the detecting, at different time points, two different optical signals radiated from the bend of the optical fiber to be detected includes:
s21, arranging a first optical detector and a second optical detector on the transmission path of the optical fiber to be tested and on two sides of the bend respectively;
s22, detecting a first optical signal radiated outside the optical fiber to be detected by using the first optical detector; and detecting a second optical signal radiated to the outside of the optical fiber to be detected by using the second optical detector.
The first optical detector and the second optical detector are respectively fixed on two different planes, the included angle formed by the two different planes ranges from 150 degrees to 170 degrees, and the bending position of the optical fiber to be detected is placed close to the included angle between the first optical detector 1 and the second optical detector 2. Optionally, the included angle is 169 °, so that the influence of external environment light on the two optical detectors can be avoided, and the accuracy of optical fiber identification is improved. In this embodiment, the first photodetector and the second photodetector are both photosensitive detectors.
The optical fiber to be detected is a fiber to be detected, and the first optical detector and the second optical detector are respectively arranged on two sides of the interface, so that the first optical detector and the second optical detector can respectively detect two different optical signals, namely the first optical signal is different from the second optical signal.
S30, determining Rayleigh scattered light signals in the two optical signals according to the relative intensity of the two optical signals;
in this step, as shown in fig. 4, the determining the rayleigh scattered light signal of the two optical signals according to the relative magnitude of the intensities of the two optical signals includes:
s31, respectively and correspondingly converting the two optical signals into two preprocessing electric signals;
s32, respectively carrying out nonlinear amplification and analog-to-digital conversion processing on the two preprocessed electric signals in sequence to obtain two electric signals;
and S33, performing difference processing on the two electric signals, and determining one optical signal with small corresponding light intensity in the two electric signals, wherein the optical signal is a Rayleigh scattered light signal.
As an alternative embodiment, the present invention utilizes a signal processing system to process and identify the optical signal radiated to the outside by the optical fiber under test. Fig. 5 shows a schematic structural diagram of the signal processing system, as shown in fig. 5, the signal processing system includes a first processing unit, a second processing unit, and a processor, wherein:
the first processing unit sequentially comprises a first light detector, a first nonlinear amplification circuit and a first A/D circuit. The first optical detector converts the detected first optical signal into an electrical signal and outputs the electrical signal to the first nonlinear amplifying circuit, and the first nonlinear amplifying circuit nonlinearly amplifies the electrical signal detected by the first optical detector; and the first A/D circuit performs analog-to-digital conversion on the amplified signal to generate a first electric signal and transmits the first electric signal to the processor for processing. Optionally, the first processing unit further includes a first D/a circuit, and the processor controls the first D/a circuit to perform digital-to-analog conversion on data, and outputs a voltage to the first nonlinear amplifying circuit, which is biased, so as to reduce the influence of dark current and noise on the electrical signal output by the first photodetector.
The second processing unit comprises a second optical detector, a second nonlinear amplifying circuit and a second A/D circuit in sequence. The second optical detector converts the detected second optical signal into an electrical signal and outputs the electrical signal to the second nonlinear amplifying circuit, and the second nonlinear amplifying circuit nonlinearly amplifies the electrical signal detected by the second optical detector; and the second A/D circuit performs analog-to-digital conversion on the amplified signal to generate a second electric signal and transmits the second electric signal to the processor for processing. Optionally, the first processing unit further includes a second D/a circuit, and the processor controls the second D/a circuit to perform digital-to-analog conversion on the data, and outputs a voltage to the second nonlinear amplifying circuit, which is biased, so as to reduce the influence of dark current and noise on the electrical signal output by the second photodetector.
The processor performs difference processing on the first electric signal and the second electric signal, so that which optical signal of the first optical signal and the second optical signal is a rayleigh scattered optical signal can be known. Specifically, after the difference is made between the two electrical signals (voltages), the relative magnitude of the two electrical signals can be known; because the inside of the optical detector is provided with the diode, the intensity of the optical signal is in linear relation with the voltage, and the output voltage is large if the intensity of the optical signal is large, the relative magnitude of the two different intensities of the optical signal can be known according to the relative magnitude of the voltage. Because the light is transmitted in the optical fiber, the intensity of the generated rayleigh scattered signal is obviously smaller than that of the transmitted light signal, and therefore the rayleigh scattered light signal is judged to be the rayleigh scattered light signal with relatively smaller light intensity. Further, the signal transmission direction in the optical fiber to be detected can be judged according to the relative intensity of the two optical signal intensities.
As another alternative, after the rayleigh scattered light signal is determined, a target photodetector for detecting the rayleigh scattered light signal in the first photodetector and the second photodetector may be further determined; and acquiring two Rayleigh scattered light signals detected by the target light detector at different time points.
It can be understood that, in one identification process, once it is known which detector detected the rayleigh scattered light signal, since the transmission direction of the optical fiber to be detected in this identification is not changed, the rayleigh scattered light signal can be detected at different time points by using only the target detector and directly performing step S40 without repeatedly performing steps S20-S30, thereby simplifying the identification step and improving the identification efficiency.
Of course, in other alternative embodiments, steps S20-S30 may be performed at each time point, so that each detection determines which optical signal is the rayleigh scattered optical signal.
Further, the signal processing system further comprises a display unit for displaying the result obtained by the processor.
S40, demodulating and differentiating two Rayleigh scattered light signals detected at adjacent time points to obtain a differential signal;
after the rayleigh scattered light signal is determined in step S30, the step is only to process the adjacent rayleigh scattered light signal, that is, the present invention identifies the bearer service by using the rayleigh scattered light signal radiated at the bend of the optical fiber to be measured. Specifically, as shown in fig. 6, the step S40 includes:
s41, performing digital orthogonal demodulation on the two Rayleigh scattered light signals detected at adjacent time points to obtain two Rayleigh scattered light signal amplitudes;
and S42, carrying out difference processing on the two Rayleigh scattered light signal amplitudes to obtain a difference signal.
Based on a digital orthogonal demodulation principle, mixing each Rayleigh scattering light signal with two orthogonal sinusoidal signals generated by a processor respectively, filtering out high-frequency signals through a low-pass filter to obtain two output signals, and performing square sum and root operation on the two output signals to obtain amplitude information of the Rayleigh scattering signals; and then, the amplitudes of the two Rayleigh scattered light signals are subjected to difference to obtain a difference signal corresponding to the Rayleigh scattered light signal.
And S50, identifying the type of the bearing service of the optical fiber to be tested according to the characteristics of the differential signal.
Specifically, the principle of identifying the type of the bearer service of the optical fiber to be tested according to the characteristics of the differential signal is as follows:
for a general optical fiber for sensing (Phase-OTDR), the operating wavelength is 1550nm, the input is a narrow linewidth laser pulse signal, and the period of the signal needs to be greater than the round-trip time of the optical pulse propagating in the optical fiber, so as to avoid the optical pulse aliasing in the optical fiber and affecting the system operation. In addition, to ensure the positioning accuracy, the pulse width of the light pulse should be small (e.g., 1ms pulse period, 100nm pulse width, corresponding to 10m spatial resolution). Meanwhile, because the Phase-OTDR working principle is interference, extremely narrow line width and extremely small frequency drift are needed, the narrower the line width is, the more obvious the interference effect is, and the higher the system sensitivity is. Therefore, the main optical signal transmitted through the optical fiber of the Phase-OTDR system is a periodic pulse signal having a small duty ratio and a narrow line width.
For the optical fiber for communication, the operating wavelength is 1550nm, but a modulated continuous laser signal is input, and the change of the light intensity of the same section along with time is related to the transmitted data bit stream. Commonly used optical fiber communication line code types include return-to-zero (RZ), chirp return-to-zero (CRZ), carrier-frequency-suppressed return-to-zero (CSRZ), and differential return-to-zero (DRZ), intensity of optical signals in optical fibers for communication fluctuates with time without an obvious rule, and the optical signals transmitted in the optical fibers are usually continuous light or modulated pulsed light with a high frequency. Thus, the optical signal transmitted through the optical fiber for communication has no strict periodicity.
Based on the fact that the characteristics of the optical signal transmitted in the optical fiber are the same as those of the optical signal radiated to the outside, Rayleigh scattered light signals radiated by the sensing optical fiber also show a periodic pulse rule; rayleigh scattered light signals radiated by the communication optical fiber do not show a periodic pulse law.
Therefore, the invention identifies the fiber-carried service according to the obtained differential signal of the Rayleigh scattered light signal. The differential signal is displayed through the display unit, fig. 7 shows differential signals of two different optical fibers, and as shown in fig. 7, the identifying the type of the bearer service of the optical fiber to be tested includes:
if the differential signal shows a periodic pulse rule, identifying the optical fiber to be detected as a sensing optical fiber; alternatively, the first and second electrodes may be,
and if the differential signal does not show a periodic pulse rule, identifying the optical fiber to be detected as a communication optical fiber.
The identification process may be human identification or automatic identification by the processor, which is not limited herein. The sensing optical fiber is used for monitoring information such as optical fiber temperature, strain and the like; the optical fiber for communication is an optical fiber for transmitting information.
The optical fiber bearing service identification method provided by the invention is based on the lossless optical fiber bending coupling principle, can be used for bending any position of an optical fiber to be detected, is not limited by the identification position, and expands the application scene; the optical fiber in operation can be analyzed on the premise of not damaging or influencing the operation of the optical fiber, and the optical fiber analysis device has important practical values for improving the operation and maintenance efficiency of the optical cable and reducing potential safety hazards; the method and the device can detect the optical fiber position without cutting off the optical fiber communication, greatly reduce the influence on the optical fiber communication system, and have the advantages of low cost, high efficiency and detection of any optical fiber position.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for identifying a fiber optic bearer service, the method comprising:
controlling the bending of the optical fiber to be tested to radiate a part of optical signals to the outside of the optical fiber to be tested;
detecting two different optical signals radiated from the bent part of the optical fiber to be detected at different time points;
determining Rayleigh scattered light signals in the two optical signals according to the relative intensity of the two optical signal intensities;
demodulating and differentiating two Rayleigh scattered light signals detected at adjacent time points to obtain differential signals;
and identifying the type of the bearing service of the optical fiber to be tested according to the characteristics of the differential signal.
2. The method of claim 1, wherein controlling the bending of the optical fiber under test to radiate a portion of the optical signal out of the optical fiber under test comprises:
when the optical fiber to be detected is in a working state, transmitting an optical signal along the optical fiber to be detected, controlling the optical fiber to be detected to bend, and radiating part of the transmitted optical signal outside the optical fiber at the bent part of the optical fiber to be detected; at the same time, the user can select the desired position,
and the residual transmission optical signal is continuously transmitted along the optical fiber to be detected, a Rayleigh scattering optical signal opposite to the transmission optical signal is generated in the optical fiber, and part of the Rayleigh scattering optical signal is radiated outside the optical fiber.
3. The method of claim 1, wherein detecting two different optical signals radiated from the bend of the optical fiber under test at different time points comprises:
a first optical detector and a second optical detector are respectively arranged on the transmission path of the optical fiber to be detected and on two sides of the bent part;
detecting a first optical signal radiated to the outside of the optical fiber to be detected by using the first optical detector; and detecting a second optical signal radiated to the outside of the optical fiber to be detected by using the second optical detector.
4. The method of claim 3, wherein the first and second light detectors are in two different planes, respectively, and the angle formed by the two different planes is in a range of 150 ° to 170 °.
5. The method of claim 3, wherein the first and second photodetectors are each photosensitive detectors.
6. The method of claim 1, wherein determining the rayleigh scattered light signal of the two optical signals according to the relative magnitude of the intensities of the two optical signals comprises:
respectively and correspondingly converting the two optical signals into two preprocessing electric signals;
respectively carrying out nonlinear amplification and analog-to-digital conversion processing on the two preprocessed electric signals in sequence to obtain two electric signals;
and performing difference processing on the two electrical signals to determine an optical signal with small corresponding light intensity in the two electrical signals, wherein the optical signal is a Rayleigh scattered light signal.
7. The method according to claim 3, wherein before demodulating and differentiating the two rayleigh scattered light signals detected at adjacent time points to obtain a differential signal, the method further comprises:
according to the determined Rayleigh scattered light signals, further determining a target light detector used for detecting Rayleigh scattered light signals in the first light detector and the second light detector;
and acquiring two Rayleigh scattered light signals detected by the target light detector at different time points.
8. The method according to claim 1 or 7, wherein the demodulating and differentiating the two rayleigh scattered light signals detected at adjacent time points to obtain a differential signal comprises:
respectively carrying out digital orthogonal demodulation on two Rayleigh scattered light signals detected at adjacent time points to obtain amplitude information of the two Rayleigh scattered light signals;
and carrying out difference processing on the amplitude information of the two Rayleigh scattering optical signals to obtain a difference signal.
9. The method according to claim 1, wherein said identifying a bearer service type of the optical fiber under test according to the differential signal comprises:
and if the differential signal shows a periodic pulse rule, identifying the optical fiber to be detected as the optical fiber for sensing.
10. The method according to claim 1, wherein said identifying a bearer traffic type of the optical fiber under test according to the characteristics of the differential signal further comprises:
and if the differential signal does not show a periodic pulse rule, identifying the optical fiber to be detected as a communication optical fiber.
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| CN114884570A (en) * | 2022-06-16 | 2022-08-09 | 北京泛在云科技有限公司 | Optical fiber eavesdropping detection method and device |
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| CN109596205A (en) * | 2018-12-21 | 2019-04-09 | 电子科技大学 | A kind of dipulse optical fiber vibration sensing method based on time delay optical fiber |
| US20190219478A1 (en) * | 2014-08-28 | 2019-07-18 | Adelos, Inc. | Noise management for optical time delay interferometry |
| CN113438016A (en) * | 2021-06-25 | 2021-09-24 | 国网江苏省电力有限公司无锡供电分公司 | Optical cable identity recognition method |
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| US20190219478A1 (en) * | 2014-08-28 | 2019-07-18 | Adelos, Inc. | Noise management for optical time delay interferometry |
| CN109596205A (en) * | 2018-12-21 | 2019-04-09 | 电子科技大学 | A kind of dipulse optical fiber vibration sensing method based on time delay optical fiber |
| CN113438016A (en) * | 2021-06-25 | 2021-09-24 | 国网江苏省电力有限公司无锡供电分公司 | Optical cable identity recognition method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114884570A (en) * | 2022-06-16 | 2022-08-09 | 北京泛在云科技有限公司 | Optical fiber eavesdropping detection method and device |
| CN114884570B (en) * | 2022-06-16 | 2024-01-19 | 北京泛在云科技有限公司 | Optical fiber eavesdropping detection method and device |
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