CN111211832B - Method and system for determining optical cable running state based on polarization mode dispersion - Google Patents
Method and system for determining optical cable running state based on polarization mode dispersion Download PDFInfo
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Abstract
The invention discloses a method and a system for determining the running state of an optical cable based on polarization mode dispersion, which comprises the following steps: detecting a PMD value of an optical cable to be detected to obtain a real-time PMD value of the optical cable to be detected; comparing the real-time PMD value of the optical cable to be tested with a preset PMD value and a matching degree quantization relation table to determine a matching degree quantization index of the optical cable to be tested; and matching the stress type based on a preset stress type spectrogram according to the real-time PMD value of the optical cable to be tested and the matching degree quantization index of the optical cable to be tested, and determining the stress type of the external force applied to the optical cable to be tested. According to the method for determining the optical cable running state based on polarization mode dispersion, after the real-time PMD value of the cable to be measured is determined, the stress type of the external force received by the optical cable to be measured can be conveniently and quickly determined according to the stress type time spectrogram, the PMD value and the matching degree quantitative relation table, and therefore the running state of the optical cable to be measured is determined.
Description
Technical Field
The invention relates to the field of power communication optical cables in power transmission lines and urban power transmission channels, in particular to a method and a system for determining the operating state of an optical cable based on polarization mode dispersion.
Background
The electric power communication optical cable is greatly developed, and meanwhile, the phenomenon of external force damage is more prominent. At present, the operation defects of optical cables and optical fibers can not be found in time, the breakpoint position is found through an Optical Time Domain Reflectometer (OTDR) after-test basically only when the optical fibers are interrupted, only a small amount of optical fibers are subjected to optical fiber stress test, the on-line test and analysis on the operating health conditions of the optical fibers and the optical fibers can not be carried out, many emergencies exist, and the state maintenance requirements can not be met.
The factors influencing the optical cable by external force mainly include natural environment, human factors and unexpected factors. The external force damage causes potential safety hazards to the safe, reliable and healthy operation of the power communication network. For a long time, the method mainly depends on fault treatment or quality judgment after a fault occurs, the current technical means cannot comprehensively detect the running quality state of the optical fiber, cannot estimate the service life, cannot provide scientific basis for the maintenance and replacement of the optical cable, and causes certain potential safety hazards in the existing communication network system. Accordingly, there is a need for a method of determining the operational status of an optical cable.
Disclosure of Invention
The invention provides a method and a system for determining the running state of an optical cable based on Polarization Mode Dispersion (PMD), which aim to solve the problem of how to determine the type of external force applied to the optical cable.
In order to solve the above problems, according to an aspect of the present invention, there is provided a method of determining an operational state of an optical cable based on polarization mode dispersion, the method including:
detecting a PMD value of an optical cable to be detected to obtain a real-time PMD value of the optical cable to be detected;
comparing the real-time PMD value of the optical cable to be tested with a preset PMD value and a PMD value range in a matching degree quantization relation table, determining a PMD value range corresponding to the real-time PMD value, and determining a matching degree quantization index of the optical cable to be tested according to the determined PMD value range;
and matching the stress type based on a preset stress type spectrogram according to the real-time PMD value of the optical cable to be tested and the matching degree quantization index of the optical cable to be tested, and determining the stress type of the external force applied to the optical cable to be tested.
Preferably, the performing PMD value detection on the optical cable to be tested to obtain a real-time PMD value of the optical cable to be tested includes:
and carrying out PMD value detection on the optical cable to be detected according to preset sampling times so as to obtain a plurality of PMD values, and carrying out mean value calculation on the obtained plurality of PMD values so as to obtain a real-time PMD value of the optical cable to be detected.
Preferably, in the preset PMD value and matching degree quantization relation table, the PMD value range corresponds to the matching degree quantization index one to one, and as the PMD value range increases, the matching degree quantization index corresponding to the PMD value range shows a monotone increasing trend.
Preferably, wherein the method further comprises:
applying external forces of different stress types to the multiple groups of optical cables to obtain PMD values of the multiple groups of optical cables under different stress types, and performing statistical analysis on the obtained PMD values under different stress types to determine a spectrogram under the stress type.
Preferably, the determined stress type of the external force applied to the optical cable to be tested is as follows: twisting, bending, or flattening.
According to another aspect of the present invention, there is provided a system for determining an operational state of an optical cable based on polarization mode dispersion, the system comprising:
the real-time PMD value acquisition unit is used for detecting the PMD value of the optical cable to be detected so as to acquire the real-time PMD value of the optical cable to be detected;
the matching degree quantization index determining unit is used for comparing the real-time PMD value of the optical cable to be tested with a preset PMD value and a PMD value range in a matching degree quantization relation table, determining a PMD value range corresponding to the real-time PMD value, and determining the matching degree quantization index of the optical cable to be tested according to the determined PMD value range;
and the stress type determining unit is used for matching the stress types based on a preset stress type time spectrogram according to the real-time PMD value of the optical cable to be tested and the matching degree quantization index of the optical cable to be tested, and determining the stress type of the external force applied to the optical cable to be tested.
Preferably, the real-time PMD value determining unit performs PMD value detection on the optical cable to be tested to obtain a real-time PMD value of the optical cable to be tested, including:
and carrying out PMD value detection on the optical cable to be detected according to preset sampling times so as to obtain a plurality of PMD values, and carrying out mean value calculation on the obtained plurality of PMD values so as to obtain a real-time PMD value of the optical cable to be detected.
Preferably, in the preset PMD value and matching degree quantization relation table, the PMD value range corresponds to the matching degree quantization index one to one, and as the PMD value range increases, the matching degree quantization index corresponding to the PMD value range shows a monotone increasing trend.
Preferably, wherein the system further comprises:
and the stress type spectrogram determining unit is used for applying external forces of different stress types to the multiple groups of optical cables to obtain PMD values of the multiple groups of optical cables under different stress types, and performing statistical analysis on the obtained PMD values under different stress types to determine the stress type spectrogram.
Preferably, the determined stress type of the external force applied to the optical cable to be tested is as follows: twisting, bending, or flattening.
The invention provides a method and a system for determining the running state of an optical cable based on polarization mode dispersion, which comprises the following steps: detecting a PMD value of an optical cable to be detected to obtain a real-time PMD value of the optical cable to be detected; comparing the real-time PMD value of the optical cable to be tested with a preset PMD value and a matching degree quantization relation table to determine a matching degree quantization index of the optical cable to be tested; and matching the stress type based on a preset stress type spectrogram according to the real-time PMD value of the optical cable to be tested and the matching degree quantization index of the optical cable to be tested, and determining the stress type of the external force applied to the optical cable to be tested. The method collects and analyzes PMD value data under different working conditions through a large number of experiments, correspondingly quantizes the PMD value and the matching degree of the optical fiber through intelligent resolving to form a database, comprehensively analyzes the types of most external forces of the optical fiber cable in construction operation, summarizes and summarizes to form a stress type spectrogram with practicability, and provides a PMD value and matching degree quantization relation table.
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A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a method 100 for determining an operational state of a fiber optic cable based on polarization mode dispersion according to an embodiment of the present invention;
FIG. 2 is a graph of force profiles according to an embodiment of the present invention; and
fig. 3 is a schematic diagram of a system 300 for determining an operational state of a fiber optic cable based on polarization mode dispersion according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same unit/element is denoted by the same reference numeral.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
FIG. 1 is a flow chart of a method 100 for determining an operational state of a fiber optic cable based on polarization mode dispersion according to an embodiment of the present invention. As shown in fig. 1, in the method for determining an optical cable operating state based on polarization mode dispersion according to the embodiment of the present invention, PMD value data under different working conditions is collected and analyzed through a large number of experiments, the PMD value and the matching degree of an optical fiber are correspondingly quantized through intelligent solution to form a database, the types of most external forces of the optical cable and the optical fiber during construction operation are comprehensively analyzed, a stress type time spectrum with practicability is formed through induction and summary, a PMD value and matching degree quantization relation table is provided, and after the real-time PMD value of the cable to be measured is determined, the stress type of the external force received by the optical cable and the optical cable to be measured can be conveniently and rapidly determined according to the stress type time spectrum, the PMD value and the matching degree quantization relation table, so as to determine the operating state of the optical cable to be measured. The method 100 for determining the optical cable running state based on polarization mode dispersion according to the embodiment of the present invention starts with step 101, and performs polarization mode dispersion PMD value detection on the optical cable to be tested in step 101 to obtain a real-time PMD value of the optical cable to be tested.
Preferably, the performing PMD value detection on the optical cable to be tested to obtain a real-time PMD value of the optical cable to be tested includes:
and carrying out PMD value detection on the optical cable to be detected according to preset sampling times so as to obtain a plurality of PMD values, and carrying out mean value calculation on the obtained plurality of PMD values so as to obtain a real-time PMD value of the optical cable to be detected.
The power communication optical cable is damaged by external force in different ways and reasons. The factors influencing the service life of the optical cable by natural environment mainly comprise lightning stroke, icing, electric corrosion, breeze vibration, galloping and the like, and mainly aim at OPGW, ADSS and common overhead optical cables. The artificial factors mainly comprise optical cable construction, municipal construction, irregular operation and maintenance, artificial damage, vehicle collision (stretching) and the like, and other factors mainly comprise animal damage, misoperation, theft and the like.
However, through careful analysis and judgment, all types of external force events applied to the optical cable mainly appear as: bending, flattening and twisting. The stretching mainly generates the diameter shrinkage of the optical cable and the creep deformation also generates the diameter shrinkage, and the stress generated by stretching due to external force impact is reduced to flattening, and the external forces are all to reduce the external diameter of the optical cable and apply force to the internal optical fiber through the outer layer. External forces such as vibration and waving are summarized as bending, including long-term and short-term external force application, instantaneous temperature rise such as lightning stroke, and external mass increase such as ice coating. The twisting is mainly shown in the construction process, including the construction of an optical cable passing through a pulley and an underground channel. Therefore, the types of the external force factors of the original figure eight doors can be summarized into three types: bending, flattening, and twisting.
The optical fiber is an anisotropic crystal, and one beam of light incident into the optical fiber is decomposed into two beams of refracted light. This phenomenon is referred to as optical birefringence, and if the optical fiber is ideal, it means that its cross section is not distorted, and is a perfect true circle, and there is no stress in the core, and the optical fiber itself has no bending phenomenon, and when the refractive index of two beams of birefringent light transmitted in the axial direction of the optical fiber is constant, and is identical to that of an isotropic crystal, the PMD value is equal to 0. However, in practice, the optical fiber is not ideal, and the two polarization modes cannot be completely degenerated for various reasons, so that the polarization unstable state is generated.
The polarization state of light in the single-mode fiber is unstable, and different external forces will cause different polarization state changes, and certainly, more influencing factors come from the inside of the fiber (fiber manufacturers draw the fiber by using a spinning rod method, and change the ellipticity and asymmetric transverse stress of a fiber core layer). The intensity of the light, the frequency and the phase of the polarization state (vector A) vary with the variation of the measurement state. However, when the external force causes the optical cable to bend and further affects the optical fiber, the PMD value shows a certain delay (the unit of the PMD value is Ps, the coefficient of the PMD value is Ps/km ^1/2), and the delay shows that the data are functionally related under different external force magnitudes and are monotonous.
The measuring technology of PMD value is mature, and the combination of the existing research results shows that the finished optical cable has certain influence on the PMD value of the optical fiber due to external factors such as bending and torsion generated by construction and external force, but the influence is smaller than the PMD value of the optical fiber per se. In the analysis after a large amount of data collection, the rule is found to be related to the PMD value. The randomness of this can produce meaningful representations within different slopes. Particularly, the trend presented in the time domain (PMD value is mainly a time value) can be used as a basis for judgment through the optimization of an algorithm.
Fundamental characteristics of PMD value coefficient of polarization mode dispersion: the probability density distribution of the dispersion values of the PMD values in the optical fiber conforms to Maxwell distribution, and the distribution function is as follows:
wherein, the PMD value coefficient changes with the change of wavelength, time, temperature and state instantaneously. As an environmentally sensitive statistic, the PMD value test is intended to keep the external environment as stable as possible. For optical fibers having a length greater than 1 km, the PMD value is proportional to the square root of the length, taking into account the effect of mode coupling.
From experimental data: for the same optical fiber of the same optical cable, the structure is fixed, and the birefringence and mode coupling caused by the internal structure are basically fixed. During testing, the state of the optical cable is unchanged, and the changing point caused by the outside is stable. The temperature sensitivity of the PMD value coefficient is stable and unchanged in the practical optical cable. But the PMD value has some fluctuation over time. Thus, in an embodiment of the invention, to ensure the statistical properties of the measurements, the tests are tested once every 1 hour, with multiple measurements being averaged. The optical cable can be OPGW, ADSS, OPPC, ordinary aerial optical cable, pipeline optical cable, direct-buried optical cable, in-station optical cable and the like.
In step 102, the real-time PMD value of the optical cable to be tested is compared with a preset PMD value and a PMD value range in the matching degree quantization relation table, a PMD value range corresponding to the real-time PMD value is determined, and a matching degree quantization index of the optical cable to be tested is determined according to the determined PMD value range.
Preferably, in the preset PMD value and matching degree quantization relation table, the PMD value range corresponds to the matching degree quantization index one to one, and as the PMD value range increases, the matching degree quantization index corresponding to the PMD value range shows a monotone increasing trend.
In the embodiment of the present invention, all the stress conditions are classified into three stress modes, including: crush, bend and twist. The PMD value test data is coupled with the three modes, the monotonicity that torsion is less than bending and less than flattening is realized by integrating the matching function of the PMD value coefficient, and the matching degree quantization index corresponding to the PMD value shows a monotonous increasing trend along with the increase of the PMD value. The corresponding relationship table of PMD values and the matching degree quantization indexes is shown in table 1. After the real-time PMD value is determined, the matching degree quantization index corresponding to the real-time PMD value can be determined through the table 1.
TABLE 1 PMD value and match quantitative relation table
In step 103, according to the real-time PMD value of the optical cable to be tested and the quantitative index of the matching degree of the optical cable to be tested, matching the stress type based on a preset stress type spectrogram, and determining the stress type of the external force applied to the optical cable to be tested.
Preferably, wherein the method further comprises:
applying external forces of different stress types to the multiple groups of optical cables to obtain PMD values of the multiple groups of optical cables under different stress types, and performing statistical analysis on the obtained PMD values under different stress types to determine a spectrogram under the stress type.
Preferably, the determined stress type of the external force applied to the optical cable to be tested is as follows: twisting, bending, or flattening.
In the embodiment of the invention, through realizing data, the PMD value is further provided that the main external stress is torsion stress at the stage of 0.050-0.201, the bending stress at the stage of 0.210-0.498 and the flattening stress at the stage of 0.501-0.997, and matching spectrograms of at least three optical fiber cables are formed. Because all types of stress are summarized into the three modes, in practical engineering application, if the numerical values are generated, the matching is directly carried out on a matching chart and a spectrogram, so that the judgment is directly carried out, and a safety guarantee method is established for the construction and operation and maintenance of the communication optical cable engineering. Wherein, the actual torsion is represented as pulley passing in the construction process and the waving ice coating in the operation of the optical cable; the bending is represented by the phenomena of breeze vibration, windage yaw, lightning stroke and the like in operation; flattening is primarily manifested by tensile and creep and external force impacts, including tensile and stress strains. The stress type time spectrum of the embodiment of the invention is shown in figure 2. After the real-time PMD value and the matching degree of the optical cable to be tested are determined, the real-time PMD value and the matching degree can be matched with the stress type spectrogram so as to determine the stress type.
In an embodiment of the present invention, an optical cable was tested, wherein the optical cable model is OPGW-24B1+12ULL-240{ 267.5; 243.4}. The field working conditions are as follows: the vibration test is carried out on the optical cable on a span with the length of 60 meters, the tensile force of the optical cable reaches 60 percent RTS, the amplitude of the optical fiber reaches a standard required value, and the times reach 108Next, the process is repeated. After about 7 million shocks, the bending strain of the cable has been such that the dynamic stresses of the fiber can cause fatigue cracks in the fiber. Firstly, real-time monitoring data (the average sampling time is more than 3 times) is carried out through a PMD value, after the PMD value numerical value (0.259) is displayed, rechecking can be carried out on the PMD value and a matching degree relation table at the first time to determine the matching degree, then, the position is searched in an area on a spectrogram when the force is applied, and the type of the external force is judged.
Fig. 3 is a schematic diagram of a system 300 for determining an operational state of a fiber optic cable based on polarization mode dispersion according to an embodiment of the present invention. As shown in fig. 3, the system 300 for determining the operating status of an optical cable based on polarization mode dispersion according to an embodiment of the present invention includes: a real-time PMD value acquisition unit 301, a matching degree quantization index determination unit 302 and a stress type determination unit 303.
Preferably, the real-time PMD value obtaining unit 301 is configured to perform polarization mode dispersion PMD value detection on the optical cable to be detected, so as to obtain a real-time PMD value of the optical cable to be detected.
Preferably, the real-time PMD value determining unit 301 performs PMD value detection on the optical cable to be tested to obtain a real-time PMD value of the optical cable to be tested, including:
and carrying out PMD value detection on the optical cable to be detected according to preset sampling times so as to obtain a plurality of PMD values, and carrying out mean value calculation on the obtained plurality of PMD values so as to obtain a real-time PMD value of the optical cable to be detected.
Preferably, the matching degree quantization index determining unit 302 is configured to compare the real-time PMD value of the optical cable to be tested with a preset PMD value and a PMD value range in a matching degree quantization relation table, determine a PMD value range corresponding to the real-time PMD value, and determine the matching degree quantization index of the optical cable to be tested according to the determined PMD value range.
Preferably, in the preset PMD value and matching degree quantization relation table, the PMD value range corresponds to the matching degree quantization index one to one, and as the PMD value range increases, the matching degree quantization index corresponding to the PMD value range shows a monotone increasing trend.
Preferably, the stress type determining unit 303 is configured to perform stress type matching based on a preset stress type time spectrogram according to the real-time PMD value of the optical cable to be tested and the matching degree quantization index of the optical cable to be tested, and determine the stress type of the external force applied to the optical cable to be tested.
Preferably, wherein the system further comprises:
and the stress type spectrogram determining unit is used for applying external forces of different stress types to the multiple groups of optical cables to obtain PMD values of the multiple groups of optical cables under different stress types, and performing statistical analysis on the obtained PMD values under different stress types to determine the stress type spectrogram.
Preferably, the determined stress type of the external force applied to the optical cable to be tested is as follows: twisting, bending, or flattening.
The system 300 for determining the operating state of the optical cable based on polarization mode dispersion according to the embodiment of the present invention corresponds to the method 100 for determining the operating state of the optical cable based on polarization mode dispersion according to another embodiment of the present invention, and will not be described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A method for determining an operational state of an optical fiber cable based on polarization mode dispersion, the method comprising:
detecting a PMD value of an optical cable to be detected to obtain a real-time PMD value of the optical cable to be detected;
comparing the real-time PMD value of the optical cable to be tested with a preset PMD value and a PMD value range in a matching degree quantization relation table, determining a PMD value range corresponding to the real-time PMD value, and determining a matching degree quantization index of the optical cable to be tested according to the determined PMD value range;
according to the real-time PMD value of the optical cable to be tested and the matching degree quantization index of the optical cable to be tested, matching of stress types is carried out on the basis of a preset stress type spectrogram, and the stress type of the external force applied to the optical cable to be tested is determined;
the method further comprises the following steps:
applying external forces of different stress types to the multiple groups of optical cables to obtain PMD values of the multiple groups of optical cables under different stress types, and performing statistical analysis on the obtained PMD values under different stress types to determine a spectrogram under the stress type.
2. The method of claim 1, wherein the performing PMD value testing on the fiber optic cable under test to obtain real-time PMD values for the fiber optic cable under test comprises:
and carrying out PMD value detection on the optical cable to be detected according to preset sampling times so as to obtain a plurality of PMD values, and carrying out mean value calculation on the obtained plurality of PMD values so as to obtain a real-time PMD value of the optical cable to be detected.
3. The method according to claim 1, wherein in the preset PMD value and matching degree quantization relation table, PMD value ranges correspond to matching degree quantization indexes one to one, and as the PMD value range increases, the matching degree quantization indexes corresponding to the PMD value ranges show a monotonous increasing trend.
4. The method according to claim 1, wherein the determined stress type of the external force applied to the optical cable to be tested is as follows: twisting, bending, or flattening.
5. A system for determining an operational state of an optical fiber cable based on polarization mode dispersion, the system comprising:
the real-time PMD value acquisition unit is used for detecting the PMD value of the optical cable to be detected so as to acquire the real-time PMD value of the optical cable to be detected;
the matching degree quantization index determining unit is used for comparing the real-time PMD value of the optical cable to be tested with a preset PMD value and a PMD value range in a matching degree quantization relation table, determining a PMD value range corresponding to the real-time PMD value, and determining the matching degree quantization index of the optical cable to be tested according to the determined PMD value range;
the stress type determining unit is used for matching stress types based on a preset stress type time spectrogram according to the real-time PMD value of the optical cable to be tested and the matching degree quantization index of the optical cable to be tested, and determining the stress type of the external force applied to the optical cable to be tested;
the system further comprises:
and the stress type spectrogram determining unit is used for applying external forces of different stress types to the multiple groups of optical cables to obtain PMD values of the multiple groups of optical cables under different stress types, and performing statistical analysis on the obtained PMD values under different stress types to determine the stress type spectrogram.
6. The system of claim 5, wherein the real-time PMD value determining unit performs PMD value detection on the optical cable under test to obtain the real-time PMD value of the optical cable under test, comprising:
and carrying out PMD value detection on the optical cable to be detected according to preset sampling times so as to obtain a plurality of PMD values, and carrying out mean value calculation on the obtained plurality of PMD values so as to obtain a real-time PMD value of the optical cable to be detected.
7. The system according to claim 5, wherein in the preset PMD value and matching degree quantization relation table, a PMD value range and a matching degree quantization index are in one-to-one correspondence, and the matching degree quantization index corresponding to the PMD value range shows a monotone increasing trend as the PMD value range increases.
8. The system according to claim 5, wherein the determined stress type of the external force applied to the optical cable to be tested is as follows: twisting, bending, or flattening.
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