CN114039661B - Optical fiber bearing service identification method - Google Patents
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- CN114039661B CN114039661B CN202111307886.0A CN202111307886A CN114039661B CN 114039661 B CN114039661 B CN 114039661B CN 202111307886 A CN202111307886 A CN 202111307886A CN 114039661 B CN114039661 B CN 114039661B
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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 an optical fiber bearing service identification method. The method comprises the following steps: controlling the bending of the optical fiber to be tested to radiate part of optical signals outside the optical fiber to be tested; detecting two different optical signals radiated out from the bending part of the optical fiber to be detected at different time points; determining Rayleigh scattering optical signals in the two optical signals according to the relative sizes of the intensities of the two optical signals; demodulating and differentiating the two Rayleigh scattering optical signals detected by the adjacent time points to obtain differential signals; and identifying the bearing service type of the optical fiber to be detected according to the characteristics of the differential signals. The method can identify any position of the optical fiber to be detected under the condition of not cutting off normal communication of the optical fiber, and has important practical value for improving the operation and maintenance efficiency of the optical cable and reducing potential safety hazards.
Description
Technical Field
The invention relates to the technical field of optical cables, in particular to an optical fiber bearing service identification method.
Background
The information communication technology occupies a significant position in the development and application of the energy Internet, and the information and communication system is an important support for the construction of the energy Internet. Fiber optic cables are an important load bearing medium for digital communications, are mass-laid at the speed of billions of kilometers per year, and play a difficult alternative role in current communications systems. Along with the large-scale construction and application of the optical cable, the efficient and accurate operation and maintenance and management means are important guarantees for ensuring the safe operation and playing the communication efficacy of the optical cable, so that the problems and hidden dangers caused by the various crossing current situations and the operation and maintenance of the basic optical cable constructed in different periods and different reasons in actual operation are faced, and the effective solution for rapidly identifying the optical cable is researched to improve the operation and maintenance efficiency of the optical cable and reduce the potential safety hazard.
At present, most of optical cable identification adopts a mode of installing an electronic tag, and although the installation operation is simple, the identification can be performed only at specific installation positions of the optical cable, such as two ends of an optical fiber, and certain limitation exists.
Disclosure of Invention
The present invention aims to provide a method for identifying an optical fiber bearer service, which can solve at least one technical problem mentioned above. 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 part of optical signals outside the optical fiber to be tested; detecting two different optical signals radiated out from the bending part of the optical fiber to be detected at different time points; determining Rayleigh scattering optical signals in the two optical signals according to the relative sizes of the intensities of the two optical signals; demodulating and differentiating the two Rayleigh scattering optical signals detected by the adjacent time points to obtain differential signals; and identifying the bearing service type of the optical fiber to be detected according to the characteristics of the differential signals.
Optionally, the controlling the bending of the optical fiber to be measured to radiate a part of the optical signal to the outside of the optical fiber to be measured includes:
when the optical fiber to be measured is in a working state, transmitting optical signals along the optical fiber to be measured, controlling the bending of the optical fiber to be measured, and radiating part of the transmitted optical signals outside the optical fiber at the bending part of the optical fiber to be measured; at the same time, the method comprises the steps of,
and the rest of the transmission optical signals continue to be transmitted along the optical fiber to be detected, rayleigh scattering optical signals opposite to the transmission optical signals are generated in the optical fiber, and part of the Rayleigh scattering optical signals are 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 two sides of the bending part on the transmission path of the optical fiber to be tested;
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 in two different planes, and an included angle formed by the two different planes ranges from 150 degrees to 170 degrees.
Optionally, the first light detector and the second light detector are photosensitive detectors.
Optionally, the determining the rayleigh scattering optical signal in the two optical signals according to the relative magnitudes of the two optical signal intensities includes:
converting the two optical signals into two preprocessing electric signals correspondingly respectively;
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 electric signals to determine one optical signal with small corresponding light intensity in the two electric signals, wherein the optical signal is a Rayleigh scattering optical signal.
Optionally, before demodulating and differentiating the two rayleigh scattering optical 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 target light detectors for detecting the Rayleigh scattered light signals, wherein the target light detectors are used for detecting the Rayleigh scattered light signals;
and acquiring two kinds of Rayleigh scattering light signals detected by the target light detector at different time points.
Optionally, the demodulating and differentiating the two rayleigh scattering optical signals detected at adjacent time points to obtain a differential signal includes:
respectively carrying out digital quadrature demodulation on two Rayleigh scattering optical signals detected at adjacent time points to obtain two Rayleigh scattering optical signal amplitudes;
and carrying out differential processing on the two Rayleigh scattering optical signal amplitudes to obtain a differential signal.
Optionally, the identifying, according to the differential signal, a type of a bearer service of the optical fiber to be tested includes:
and if the differential signal shows a periodic pulse law, identifying the optical fiber to be detected as a sensing optical fiber.
Optionally, the identifying the type of the bearer service of the optical fiber to be tested according to the characteristic of the differential signal further includes:
and if the differential signal does not show the periodic pulse law, identifying the optical fiber to be detected as the optical fiber for communication.
Compared with the prior art, the scheme provided by the embodiment of the invention has at least the following beneficial effects:
firstly, the optical fiber bearing service identification method provided by the invention is based on the lossless optical fiber bending coupling principle, bends any position of the optical fiber to be tested, is not limited by the identification position, and expands application scenes;
secondly, the application of 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 has important practical value for improving the operation and maintenance efficiency of the optical cable and reducing the potential safety hazard;
thirdly, the optical fiber communication system is detected under the condition that the optical fiber communication is not cut off, so that the influence on the optical fiber communication system is greatly reduced, and the optical fiber communication system 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 evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. 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 of the method for detecting two different optical signals radiated from a bent portion of an optical fiber to be measured at different time points according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing detection of a portion of an optical signal emitted by the optical sensor according to an embodiment of the present invention;
FIG. 4 is a flow chart of the method for determining Rayleigh scattered light signals in two optical signals according to the relative magnitudes of the two optical signal intensities provided in an embodiment of the present invention;
fig. 5 shows a block diagram of a signal processing system according to an embodiment of the present invention;
fig. 6 is a flowchart of a method for demodulating and differentiating two rayleigh scattering optical 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 a communication optical fiber and a sensing optical fiber in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, 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 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 this application 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, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention, these terms should not be limited to these terms.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product 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 product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
The description of the above embodiments will be made with reference to an alternative embodiment.
Example 1
The embodiment of the invention provides an optical fiber bearing service identification method, and fig. 1 shows a flow chart of the optical fiber bearing service identification method. As shown in fig. 1, the method for identifying the optical fiber bearing service includes:
s10, controlling the bending of the optical fiber to be tested, so that part of optical signals are radiated outside the optical fiber to be tested;
in this step, a partial optical signal in the optical fiber is radiated to the outside based on the principle of lossless optical fiber bending coupling. Specifically, the principle of the lossless optical fiber bending coupling is to utilize any mechanical device to bend the optical fiber appropriately, so that the light originally in the fiber core does not meet the total reflection condition any more to generate bending loss, and part of the light is radiated outside the optical fiber, but the normal transmission of the optical fiber is not affected. Wherein the energy of the radiated optical signal depends on the radius of curvature or angle of curvature and the characteristics of the radiated optical signal are the same as the signal in the core.
In the practical application process, when the optical fiber to be tested is in a working state, transmitting optical signals along the optical fiber to be tested, controlling the bending of the optical fiber to be tested, and radiating part of the transmitting optical signals outside the optical fiber at the bending part of the optical fiber to be tested; meanwhile, the rest of the transmission optical signals continue to be transmitted along the optical fiber to be detected, rayleigh scattering optical signals opposite to the transmission optical signals are generated in the optical fiber, and part of the Rayleigh scattering optical signals are radiated outside the optical fiber. In this embodiment, the radius of curvature of the optical fiber to be measured is 5mm-10mm, and at this time, the bending loss caused by 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 tested.
S20, detecting different two optical signals radiated out from the bending part of the optical fiber to be detected at different time points;
in this step, the method is mainly used for detecting two different optical signals, namely a transmission optical signal and a Rayleigh scattering optical signal, which are radiated to the outside of the optical fiber. As an alternative embodiment of the present invention, as shown in fig. 2-3, the detecting two different optical signals radiated from the bending portion of the optical fiber to be tested at different time points includes:
s21, arranging a first optical detector and a second optical detector on the transmission path of the optical fiber to be tested respectively at two sides of the bent part;
s22, 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.
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 tested is placed close to the included angle of the first optical detector 1 and the second optical detector 2. Optionally, the included angle is 169 degrees, so that the influence of external environment light on the two light detectors can be avoided, and the accuracy of optical fiber identification is improved. In this embodiment, the first photodetector and the second photodetector are photosensitive detectors.
It can be understood that, with the plane perpendicular to the optical fiber to be measured where the bending position is located as an interface, the first optical detector and the second optical detector are respectively disposed at two sides of the interface, so as to ensure that the first optical detector and the second optical detector can respectively detect two different optical signals, i.e. the first optical signal is different from the second optical signal.
S30, determining Rayleigh scattering optical 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 scattering optical signal in the two optical signals according to the relative magnitudes 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;
s33, performing difference processing on the two electric signals to determine one optical signal with small corresponding light intensity in the two electric signals, wherein the optical signal is a Rayleigh scattering optical signal.
As an alternative implementation manner, the invention utilizes a signal processing system to process and identify the optical signal radiated to the outside by the optical fiber to be tested. Fig. 5 shows a schematic structural diagram of the signal processing system, as shown in fig. 5, where the signal processing system includes a first processing unit, a second processing unit, and a processor, and where:
the first processing unit sequentially comprises a first light detector, a first nonlinear amplifying circuit and a first A/D circuit. The first optical detector converts the detected first optical signal into an electric signal and outputs the electric signal to the first nonlinear amplification circuit, and the first nonlinear amplification circuit carries out nonlinear amplification on the electric signal detected by the first optical detector; the first A/D circuit carries out analog-to-digital conversion on the amplified signal, generates 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 to bias the first nonlinear amplifying circuit, so as to reduce an influence of dark current and noise on an electric signal output by the first photodetector.
The second processing unit sequentially comprises a second light detector, a second nonlinear amplifying circuit and a second A/D circuit. The second optical detector converts the detected second optical signal into an electric signal and outputs the electric signal to the second nonlinear amplification circuit, and the second nonlinear amplification circuit carries out nonlinear amplification on the electric signal detected by the second optical detector; and the second A/D circuit carries out analog-to-digital conversion on the amplified signal, generates 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 data, and outputs a voltage to the second nonlinear amplifying circuit to bias the second nonlinear amplifying circuit, so as to reduce the influence of dark current and noise on the electric signal output by the second photodetector.
The processor performs a difference process on the first electrical signal and the second electrical signal, so that it is known which optical signal of the first optical signal and the second optical signal is the rayleigh scattering optical signal. Specifically, after the difference is made between the two electrical signals (voltages), the relative sizes of the two electrical signals can be known; since the light detector is internally provided with the diode, the light signal intensity and the voltage are in linear relation, and the output voltage is large when the light signal intensity is large, the relative magnitudes of two different light signal intensities can be known according to the relative magnitudes of the voltages. Because the light is transmitted in the optical fiber, the generated Rayleigh scattering signal intensity is obviously smaller than the intensity of the transmitted light signal, and the light intensity is judged to be the Rayleigh scattering light signal with relatively smaller light intensity. Further, the signal transmission direction in the optical fiber to be measured can be judged according to the relative intensity of the two optical signals.
As another alternative embodiment, after determining the rayleigh scattered light signal, a target photodetector for detecting the rayleigh scattered light signal may be further determined for the first photodetector and the second photodetector; and acquiring two kinds of Rayleigh scattering light signals detected by the target light detector at different time points.
It can be understood that in the primary identification process, once knowing which detector detects the rayleigh scattering optical signal, since the transmission direction of the optical fiber to be detected will not change in the primary identification, the target detector can be used only to detect the rayleigh scattering optical signal at different time points and directly execute the step S40 without repeatedly executing the steps S20-S30, thereby simplifying the identification steps and improving the identification efficiency.
Of course, in other alternative embodiments, steps S20-S30 may also be performed at each point in time, so that each detection determines which optical signal is a rayleigh scattered optical signal.
Further, the signal processing system further comprises a display unit, and the display unit is used for displaying the result obtained by the processor.
S40, demodulating and differentiating the two Rayleigh scattering optical signals detected at the adjacent time points to obtain differential signals;
after the rayleigh scattering optical signal is determined in step S30, the adjacent rayleigh scattering optical signals are processed in this step, that is, the present invention uses the rayleigh scattering optical signal radiated at the bend of the optical fiber to be measured to identify the bearer service. Specifically, as shown in fig. 6, the step S40 includes:
s41, performing digital quadrature demodulation on two Rayleigh scattering optical signals detected at adjacent time points to obtain two Rayleigh scattering optical signal amplitudes;
s42, carrying out differential processing on the two Rayleigh scattering light signal amplitudes to obtain a differential signal.
Based on a digital quadrature demodulation principle, each Rayleigh scattering optical signal is mixed with two paths of quadrature sinusoidal signals generated by a processor, then a high-frequency signal is filtered through a low-pass filter, so that two paths of output signals are obtained, square sum and root number opening operation is carried out on the two paths of output signals, and amplitude information of the Rayleigh scattering signals can be obtained; and then, the amplitudes of the two Rayleigh scattering optical signals are subjected to difference to obtain a differential signal corresponding to the Rayleigh scattering optical signals.
S50, according to the characteristics of the differential signals, the bearing service type of the optical fiber to be detected is identified.
Specifically, according to the characteristics of the differential signals, the principle of identifying the bearing service type of the optical fiber to be tested is as follows:
for a common sensing optical fiber (Phase-OTDR), the working wavelength is 1550nm, the input is a narrow linewidth laser pulse signal, and the period of the optical fiber needs to be longer than the round trip time of the optical pulse propagating in the optical fiber, so as to avoid the optical pulse from generating aliasing in the optical fiber and affecting the system operation. In addition, to ensure positioning accuracy, the pulse width of the light pulse should be small (e.g., 1ms pulse period, 100nm pulse width, corresponding to a spatial resolution of 10 m). Meanwhile, because the Phase-OTDR working principle is interference, extremely narrow linewidth and extremely small frequency drift are required, the narrower the linewidth is, the more obvious the interference effect is, and the higher the system sensitivity is. Thus, the main optical signal transmitted through the optical fiber of the Phase-OTDR system is a periodic pulse signal having a relatively small duty cycle and a relatively narrow line width.
The optical fiber for communication also has an operating wavelength of 1550nm, but is input with a modulated continuous laser signal, and the change of the light intensity of the same section along with time is related to the transmitted data bit stream. Common optical fiber communication line codes include return-to-zero (RZ), chirped return-to-zero (CRZ), carrier-frequency suppressed return-to-zero (CSRZ), and differential return-to-zero (DRZ), where the intensity of the optical signal within the communication fiber is not significantly regular over time, and the optical signal transmitted in the fiber is typically continuous light or modulated, higher frequency pulsed light. Thus, the transmission of optical signals in the communication optical fiber is not strictly periodic.
Based on the fact that the characteristics of the optical signals transmitted in the optical fiber are the same as those of the optical signals radiated to the outside, rayleigh scattering optical signals radiated by the sensing optical fiber also show a periodic pulse law; the Rayleigh scattering optical signal radiated by the communication optical fiber does not show a periodic pulse law.
Therefore, the invention identifies the fiber-optic bearer traffic from the differential signal of the obtained Rayleigh scattered light signal. The differential signals are displayed by 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 law, identifying the optical fiber to be detected as a sensing optical fiber; or alternatively, the process may be performed,
and if the differential signal does not show the periodic pulse law, identifying the optical fiber to be detected as the optical fiber for communication.
The above identification process may be manual identification or may be automatic identification by the processor, which is not limited herein. The sensing optical fiber is used for monitoring information such as temperature, strain and the like of the optical fiber; the communication optical fiber 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, bends any position of the optical fiber to be tested, is not limited by the identification position, and expands the application scene; the optical fiber can be analyzed for the purpose of the optical fiber on the premise of not damaging or influencing the operation of the optical fiber, and has important practical value for improving the operation and maintenance efficiency of the optical cable and reducing the potential safety hazard; the optical fiber communication system is detected under the condition that the optical fiber communication is not cut off, so that the influence on the optical fiber communication system is greatly reduced, and the optical fiber communication system has the advantages of low cost, high efficiency and detection of any optical fiber position.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for identifying an optical fiber bearer service, the method comprising:
controlling the bending of the optical fiber to be tested to radiate part of optical signals outside the optical fiber to be tested;
detecting two different optical signals radiated out from the bending part of the optical fiber to be detected at different time points;
determining Rayleigh scattering optical signals in the two optical signals according to the relative sizes of the intensities of the two optical signals;
demodulating and differentiating the two Rayleigh scattering optical signals detected by the adjacent time points to obtain differential signals;
and identifying the type of the load bearing service of the optical fiber to be detected according to the characteristics of the differential signal, wherein the detecting of the two different optical signals radiated out from the bending position of the optical fiber to be detected at different time points comprises the following steps:
a first optical detector and a second optical detector are respectively arranged on the two sides of the bending part on the transmission path of the optical fiber to be tested;
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.
2. The method of claim 1, wherein controlling the bending of the optical fiber to be measured to radiate a portion of the optical signal out of the optical fiber to be measured comprises:
when the optical fiber to be measured is in a working state, transmitting optical signals along the optical fiber to be measured, controlling the bending of the optical fiber to be measured, and radiating part of the transmitted optical signals outside the optical fiber at the bending part of the optical fiber to be measured; at the same time, the method comprises the steps of,
and the rest of the transmission optical signals continue to be transmitted along the optical fiber to be detected, rayleigh scattering optical signals opposite to the transmission optical signals are generated in the optical fiber, and part of the Rayleigh scattering optical signals are radiated outside the optical fiber.
3. The method of claim 1, wherein the first light detector and the second light detector are respectively located in two different planes, and an included angle formed by the two different planes ranges from 150 to 170 bar.
4. The method of claim 1, wherein the first light detector and the second light detector are photosensitive detectors.
5. The method of claim 1, wherein determining the rayleigh-scattered optical signal of the two optical signals based on the relative magnitudes of the two optical signal intensities comprises:
converting the two optical signals into two preprocessing electric signals correspondingly respectively;
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 electric signals to determine one optical signal with small corresponding light intensity in the two electric signals, wherein the optical signal is a Rayleigh scattering optical signal.
6. The method of claim 1, further comprising, prior to demodulating and differentiating the two rayleigh scattered light signals detected at adjacent time points to obtain a differential signal:
according to the determined Rayleigh scattered light signals, further determining target light detectors for detecting the Rayleigh scattered light signals, wherein the target light detectors are used for detecting the Rayleigh scattered light signals;
and acquiring two kinds of Rayleigh scattering light signals detected by the target light detector at different time points.
7. The method according to claim 1 or 6, wherein demodulating and differentiating the two rayleigh scattering optical signals detected at adjacent time points to obtain a differential signal comprises:
respectively carrying out digital quadrature demodulation on two Rayleigh scattering optical signals detected at adjacent time points to obtain amplitude information of the two Rayleigh scattering optical signals;
and carrying out differential processing on the amplitude information of the two Rayleigh scattering optical signals to obtain differential signals.
8. The method of claim 1, wherein the identifying the bearer traffic type of the fiber under test based on the differential signal comprises:
and if the differential signal shows a periodic pulse law, identifying the optical fiber to be detected as a sensing optical fiber.
9. The method of claim 1, wherein the identifying the type of bearer traffic for the fiber under test based on the characteristic of the differential signal further comprises:
and if the differential signal does not show the periodic pulse law, identifying the optical fiber to be detected as the optical fiber for communication.
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