CN116938327B - FTTH optical fiber link testing method and system - Google Patents
FTTH optical fiber link testing method and system Download PDFInfo
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- CN116938327B CN116938327B CN202311195834.8A CN202311195834A CN116938327B CN 116938327 B CN116938327 B CN 116938327B CN 202311195834 A CN202311195834 A CN 202311195834A CN 116938327 B CN116938327 B CN 116938327B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 148
- 238000012360 testing method Methods 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000000253 optical time-domain reflectometry Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims description 19
- 239000000835 fiber Substances 0.000 claims description 15
- 241000282326 Felis catus Species 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004590 computer program Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 206010048669 Terminal state Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
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Abstract
The invention relates to the technical field of optical fiber link testing, and discloses a method and a system for testing an FTTH optical fiber link, wherein the method comprises the following steps: analyzing the FTTH optical fiber link and determining the length of the FTTH optical fiber link; according to the length of the FTTH optical fiber link, testing the FTTH optical fiber link by using an OTDR tester through a plurality of sets of range pulse testing conditions preset to obtain a plurality of testing curves; performing linear fitting on a plurality of test curves to obtain a complete test curve, and determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve; and judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter. The invention reduces ports required by testing, simplifies testing steps, and realizes full-function coverage from FTTH optical fiber link state judgment to breakpoint maintenance.
Description
Technical Field
The invention relates to the technical field of optical fiber link testing, in particular to a method and a system for testing an FTTH optical fiber link.
Background
In recent years, as broadband value-added services are increasingly increased, the demand of users for bandwidth is increasingly high. The FTTH broadband access scheme adopts an xPON (passive optical network) technology, has the characteristics of high bandwidth, interference resistance, easy expansion, long access distance and the like compared with other technologies, and is widely applied, so that the FTTH is considered by industry experts as the most ideal access mode in a future period of time. The problem of service guarantee of the FTTH broadband access system is increasingly highlighted, and certain optical fiber base network providers have high requirements on optical fiber fault location, so that the fault point needs to be precisely located on one branch optical fiber of the FTTH network.
The existing FTTH optical fiber link and terminal state detection device is a method for acquiring the optical signal intensity of the uplink ONU end and the downlink OLT end to judge the access state of the user optical modem, and is greatly affected by the cleanliness of the optical interface of the user ONU end. Mature OTDR schemes exist in the market at present, but the scheme can not realize the judgment of whether the FTTH optical fiber of a user is connected into a cat or not.
Disclosure of Invention
The embodiment of the invention provides a method and a system for testing an FTTH optical fiber link, which are used for solving the technical problems in the prior art.
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of an embodiment of the present invention, there is provided a method for testing an FTTH optical fiber link.
In one embodiment, the FTTH fiber optic link testing method comprises:
analyzing the FTTH optical fiber link and determining the length of the FTTH optical fiber link;
according to the length of the FTTH optical fiber link, testing the FTTH optical fiber link by using an OTDR tester through a plurality of sets of range pulse testing conditions preset to obtain a plurality of testing curves;
performing linear fitting on a plurality of test curves to obtain a complete test curve, and determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve;
and judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter.
In one embodiment, the FTTH fiber optic link testing method further comprises: each test curve is filtered by a sliding window average filtering method and/or a kalman filtering method before the plurality of test curves are linearly fitted.
In one embodiment, performing a linear fit to a plurality of test curves to obtain a complete test curve includes:
and taking the linear region as a reference, and performing linear fitting on a plurality of test curves with the same saturation peak slope and the same reflection peak rising trend by using a polynomial curve fitting method to obtain a complete test curve.
In one embodiment, the loss parameters include a splice loss parameter and a return loss parameter, and the peak parameters include a peak broadening parameter, a peak top saturation length, and a peak refractive index.
In one embodiment, determining loss parameters and peak parameters of the FTTH optical fiber link from the complete test curve comprises: analyzing the complete test curve, and determining the heights of the starting point and the end point of the reflection peak, the horizontal width of the starting point position of the reflection peak, the height of the peak top and the saturation width of the peak top of the complete test curve; and determining loss parameters and peak parameters of the FTTH optical fiber link according to the heights of the starting point and the ending point of the reflection peak, the horizontal width of the starting point position of the reflection peak, the height of the peak top and the saturation width of the peak top.
In one embodiment, determining the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter includes:
comparing the joint loss parameter with a preset joint loss threshold value, and judging that the FTTH optical fiber link has optical fiber joint pollution under the condition that the joint loss parameter is larger than the preset joint loss threshold value;
comparing the return loss parameter with a preset return loss threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the return loss parameter is smaller than the minimum value of the preset return loss threshold range as a comparison result;
comparing the peak broadening parameter with a preset peak broadening threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the comparison result is that the return loss parameter is smaller than the minimum value of the preset return loss threshold range;
calculating the peak height of the FTTH optical fiber link according to the peak broadening parameter, the peak top saturation length and the peak refractive index; and comparing the peak height with a preset peak height threshold, and judging that the optical fiber link is not connected with a light cat when the comparison result is that the peak height is larger than the preset peak height threshold.
According to a second aspect of an embodiment of the present invention, there is provided an FTTH optical fiber link testing system.
In one embodiment, the FTTH fiber optic link testing system comprises:
the optical fiber length analysis module is used for analyzing the FTTH optical fiber link and determining the length of the FTTH optical fiber link;
the optical fiber curve testing module is used for testing the FTTH optical fiber link by using an OTDR tester according to the length of the FTTH optical fiber link and through preset multiple sets of measuring range pulse testing conditions to obtain multiple testing curves;
the optical fiber curve fitting module is used for carrying out linear fitting on a plurality of test curves to obtain a complete test curve, and determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve;
and the optical fiber state judging module is used for judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter.
In one embodiment, the FTTH fiber optic link testing system further comprises:
and the optical fiber curve filtering module is used for carrying out filtering processing on each test curve by a sliding window average filtering method and/or a Kalman filtering method before carrying out linear fitting on a plurality of test curves.
In one embodiment, when the optical fiber curve fitting module performs linear fitting on a plurality of test curves to obtain a complete test curve, the complete test curve is obtained by performing linear fitting on a plurality of test curves with the same slope of a saturation peak and the same rising trend of a reflection peak by using a linear region as a reference through a polynomial curve fitting method.
In one embodiment, the loss parameters include a splice loss parameter and a return loss parameter, and the peak parameters include a peak broadening parameter, a peak top saturation length, and a peak refractive index.
In one embodiment, when determining the loss parameter and the peak parameter of the FTTH optical fiber link according to the complete test curve, the optical fiber curve fitting module analyzes the complete test curve to determine the height of the reflection peak starting point and the end point, the horizontal width of the reflection peak starting point position, the peak top height and the peak top saturation width of the complete test curve; and determining loss parameters and peak parameters of the FTTH optical fiber link according to the heights of the starting point and the ending point of the reflection peak, the horizontal width of the starting point position of the reflection peak, the height of the peak top and the saturation width of the peak top.
In one embodiment, the fiber state determination module, when determining the connection state of the FTTH fiber link based on the loss parameter and the peak parameter,
comparing the joint loss parameter with a preset joint loss threshold value, and judging that the FTTH optical fiber link has optical fiber joint pollution under the condition that the joint loss parameter is larger than the preset joint loss threshold value;
comparing the return loss parameter with a preset return loss threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the return loss parameter is smaller than the minimum value of the preset return loss threshold range as a comparison result;
comparing the peak broadening parameter with a preset peak broadening threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the comparison result is that the return loss parameter is smaller than the minimum value of the preset return loss threshold range;
calculating the peak height of the FTTH optical fiber link according to the peak broadening parameter, the peak top saturation length and the peak refractive index; and comparing the peak height with a preset peak height threshold, and judging that the optical fiber link is not connected with a light cat when the comparison result is that the peak height is larger than the preset peak height threshold.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the invention does not need to obtain the optical signal intensity of the uplink ONU end and the downlink OLT end at the same time to judge the access state of the optical modem, reduces ports required by testing, simplifies testing steps, integrates a plurality of OTDR functions and realizes full-function coverage from the judgment of the FTTH optical fiber link state to breakpoint maintenance.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
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.
FIG. 1 is a flow chart of a method of FTTH fiber-to-the-fiber link testing, according to an exemplary embodiment;
FIG. 2 is a block diagram illustrating an FTTH fiber-optic link testing system according to an exemplary embodiment;
fig. 3 is a schematic diagram of a computer device according to an exemplary embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of the embodiments herein includes the full scope of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like herein are used merely to distinguish one element from another element and do not require or imply any actual relationship or order between the elements. Indeed the first element could also be termed a second element and vice versa. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a structure, apparatus or device comprising the element. Various embodiments are described herein in a progressive manner, each embodiment focusing on differences from other embodiments, and identical and similar parts between the various embodiments are sufficient to be seen with each other.
The terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein refer to an orientation or positional relationship based on that shown in the drawings, merely for ease of description herein and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus are not to be construed as limiting the invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanically or electrically coupled, may be in communication with each other within two elements, may be directly coupled, or may be indirectly coupled through an intermediary, as would be apparent to one of ordinary skill in the art.
Herein, unless otherwise indicated, the term "plurality" means two or more.
Herein, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
Herein, the term "and/or" is an association relation describing an object, meaning that three relations may exist. For example, a and/or B, represent: a or B, or, A and B.
It should be understood that, although the steps in the flowchart are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of other steps or other steps.
The various modules in the apparatus or systems of the present application may be implemented in whole or in part in software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Fig. 1 illustrates one embodiment of a FTTH fiber optic link testing method of the present invention.
In this alternative embodiment, the FTTH fiber link testing method includes:
step S101, analyzing the FTTH optical fiber link and determining the length of the FTTH optical fiber link;
step S103, according to the length of the FTTH optical fiber link, testing the FTTH optical fiber link by using an OTDR tester through a plurality of sets of range pulse testing conditions preset to obtain a plurality of testing curves;
step S105, performing linear fitting on a plurality of test curves to obtain a complete test curve, and determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve;
and step S107, judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter.
Fig. 2 illustrates one embodiment of an FTTH fiber optic link testing system of the present invention.
In this alternative embodiment, the FTTH fiber optic link testing system comprises:
an optical fiber length analysis module 201, configured to analyze the FTTH optical fiber link and determine a length of the FTTH optical fiber link;
the optical fiber curve testing module 203 is configured to test the FTTH optical fiber link by using an OTDR tester according to the length of the FTTH optical fiber link and through a preset plurality of sets of measurement range pulse testing conditions, so as to obtain a plurality of test curves;
the optical fiber curve fitting module 205 is configured to perform linear fitting on a plurality of test curves to obtain a complete test curve, and determine a loss parameter and a peak parameter of the FTTH optical fiber link according to the complete test curve;
and the optical fiber state determining module 207 is configured to determine a connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter.
In a specific application, when the FTTH optical fiber link is analyzed and the length of the FTTH optical fiber link is determined, the length of the FTTH optical fiber link can be determined by using a dynamic test analysis link with a measuring range and a pulse width from large to small. The number of the measuring range pulse test conditions is 3 groups, the measuring range of the first group of measuring range pulse test conditions is 500m, and the pulse of the first group of measuring range pulse test conditions is 10ns; the second set of measurement pulse test conditions are selected according to the FTTH optical fiber link length obtained by initial analysis, and different measurement pulses are selected to be used in different length intervals; the third set of range pulse test conditions has a range of 4000m and the third set of range pulse test conditions has pulses of 80ns.
The method for testing the FTTH optical fiber link can also carry out filtering treatment on each test curve by a sliding window average filtering method and/or a Kalman filtering method before carrying out linear fitting on a plurality of test curves.
Correspondingly, the system comprises a fiber curve filtering module (not shown in the figure) for filtering each test curve by a sliding window average filtering method and/or a Kalman filtering method before performing linear fitting on a plurality of test curves.
When a plurality of test curves are linearly fitted to obtain a complete test curve, the linear region is taken as a reference, and the polynomial curve fitting method is used for linearly fitting a plurality of test curves with the same saturation peak slope and the same reflection peak rising trend to obtain the complete test curve.
In this alternative embodiment, the loss parameters include a splice loss parameter and a return loss parameter, and the peak parameters include a peak broadening parameter, a peak top saturation length, and a peak refractive index. When the loss parameters and the peak parameters of the FTTH optical fiber link are determined according to the complete test curve, analyzing the complete test curve, and determining the reflection peak starting point and end point height, the reflection peak starting point position horizontal width, the peak top height and the peak top saturation width of the complete test curve; and determining loss parameters and peak parameters of the FTTH optical fiber link according to the heights of the starting point and the ending point of the reflection peak, the horizontal width of the starting point position of the reflection peak, the height of the peak top and the saturation width of the peak top.
In this case, when the connection state of the FTTH optical fiber link is determined according to the loss parameter and the peak parameter, the determination may be performed by:
comparing the joint loss parameter with a preset joint loss threshold value, and judging that the FTTH optical fiber link has optical fiber joint pollution under the condition that the joint loss parameter is larger than the preset joint loss threshold value;
comparing the return loss parameter with a preset return loss threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the return loss parameter is smaller than the minimum value of the preset return loss threshold range as a comparison result;
comparing the peak broadening parameter with a preset peak broadening threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the comparison result is that the return loss parameter is smaller than the minimum value of the preset return loss threshold range;
calculating the peak height of the FTTH optical fiber link according to the peak broadening parameter, the peak top saturation length and the peak refractive index; and comparing the peak height with a preset peak height threshold, and judging that the optical fiber link is not connected with a light cat when the comparison result is that the peak height is larger than the preset peak height threshold.
In addition, if the optical fiber is broken and the height of the reflection peak of the curve at the breaking position is low, the widening distance is small or no reflection peak is in a descending trend, the length of the optical fiber breaking position from the testing position can be obtained by multiplying all points before the breaking position of the curve by the point spacing, and then the length of the optical fiber breaking position from the testing position is prompted.
FIG. 3 illustrates one embodiment of a computer device of the present invention. The computer device may be a server including a processor, memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used for communicating with an external terminal through a network connection. Which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be appreciated by those skilled in the art that the structure shown in FIG. 3 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, a computer device is also provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor performing the steps of the above-described method embodiments when the computer program is executed.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The present invention is not limited to the structure that has been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (4)
1. An FTTH optical fiber link testing method, comprising:
analyzing the FTTH optical fiber link and determining the length of the FTTH optical fiber link;
according to the length of the FTTH optical fiber link, testing the FTTH optical fiber link by using an OTDR tester through a plurality of sets of range pulse testing conditions preset to obtain a plurality of testing curves;
performing linear fitting on a plurality of test curves to obtain a complete test curve, and determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve;
judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter;
when the FTTH optical fiber link is analyzed and the length of the FTTH optical fiber link is determined, a dynamic test analysis link with a measuring range and a pulse width from large to small is used for determining the length of the FTTH optical fiber link;
performing a linear fit to the plurality of test curves to obtain a complete test curve includes: taking the linear region as a reference, and performing linear fitting on a plurality of test curves with the same saturation peak slope and the same reflection peak rising trend by using a polynomial curve fitting method to obtain a complete test curve;
the loss parameters comprise joint loss parameters and return loss parameters, and the peak parameters comprise peak broadening parameters, peak top saturation length and peak refractive index;
determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve comprises: analyzing the complete test curve, and determining the heights of the starting point and the end point of the reflection peak, the horizontal width of the starting point position of the reflection peak, the height of the peak top and the saturation width of the peak top of the complete test curve; determining loss parameters and peak parameters of the FTTH optical fiber link according to the heights of the starting point and the ending point of the reflection peak, the horizontal width of the starting point position of the reflection peak, the height of the peak top and the saturation width of the peak top;
judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter comprises: comparing the joint loss parameter with a preset joint loss threshold value, and judging that the FTTH optical fiber link has optical fiber joint pollution under the condition that the joint loss parameter is larger than the preset joint loss threshold value; comparing the return loss parameter with a preset return loss threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the return loss parameter is smaller than the minimum value of the preset return loss threshold range as a comparison result; comparing the peak broadening parameter with a preset peak broadening threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the comparison result is that the return loss parameter is smaller than the minimum value of the preset return loss threshold range; calculating the peak height of the FTTH optical fiber link according to the peak broadening parameter, the peak top saturation length and the peak refractive index; and comparing the peak height with a preset peak height threshold, and judging that the optical fiber link is not connected with a light cat when the comparison result is that the peak height is larger than the preset peak height threshold.
2. The FTTH optical fiber link testing method as claimed in claim 1, further comprising:
each test curve is filtered by a sliding window average filtering method and/or a kalman filtering method before the plurality of test curves are linearly fitted.
3. An FTTH optical fiber link testing system, comprising:
the optical fiber length analysis module is used for analyzing the FTTH optical fiber link and determining the length of the FTTH optical fiber link;
the optical fiber curve testing module is used for testing the FTTH optical fiber link by using an OTDR tester according to the length of the FTTH optical fiber link and through preset multiple sets of measuring range pulse testing conditions to obtain multiple testing curves;
the optical fiber curve fitting module is used for carrying out linear fitting on a plurality of test curves to obtain a complete test curve, and determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve;
the optical fiber state judging module is used for judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter;
the fiber length analysis module analyzes the FTTH optical fiber link, and when determining the length of the FTTH optical fiber link, the fiber length analysis module uses a dynamic test analysis link with a measuring range and a pulse width from large to small to determine the length of the FTTH optical fiber link;
when the optical fiber curve fitting module performs linear fitting on a plurality of test curves to obtain a complete test curve, performing linear fitting on a plurality of test curves with saturation peaks, same slope of the saturation peaks and same rising trend of the reflection peaks by using a linear region as a reference through a polynomial curve fitting method to obtain the complete test curve;
the loss parameters comprise joint loss parameters and return loss parameters, and the peak parameters comprise peak broadening parameters, peak top saturation length and peak refractive index;
the optical fiber curve fitting module analyzes the complete test curve when determining loss parameters and peak parameters of the FTTH optical fiber link according to the complete test curve, and determines the reflection peak starting point and end point height, the reflection peak starting point position horizontal width, the peak top height and the peak top saturation width of the complete test curve; determining loss parameters and peak parameters of the FTTH optical fiber link according to the heights of the starting point and the ending point of the reflection peak, the horizontal width of the starting point position of the reflection peak, the height of the peak top and the saturation width of the peak top;
the optical fiber state judging module compares the joint loss parameter with a preset joint loss threshold value when judging the connection state of the FTTH optical fiber link according to the loss parameter and the peak parameter, and judges that the FTTH optical fiber link has optical fiber joint pollution when the comparison result is that the joint loss parameter is larger than the preset joint loss threshold value; comparing the return loss parameter with a preset return loss threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the return loss parameter is smaller than the minimum value of the preset return loss threshold range as a comparison result; comparing the peak broadening parameter with a preset peak broadening threshold range, and judging that the FTTH optical fiber link has optical fiber breakage under the condition that the comparison result is that the return loss parameter is smaller than the minimum value of the preset return loss threshold range; calculating the peak height of the FTTH optical fiber link according to the peak broadening parameter, the peak top saturation length and the peak refractive index; and comparing the peak height with a preset peak height threshold, and judging that the optical fiber link is not connected with a light cat when the comparison result is that the peak height is larger than the preset peak height threshold.
4. The FTTH fiber optic link testing system of claim 3, further comprising:
and the optical fiber curve filtering module is used for carrying out filtering processing on each test curve by a sliding window average filtering method and/or a Kalman filtering method before carrying out linear fitting on a plurality of test curves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311195834.8A CN116938327B (en) | 2023-09-18 | 2023-09-18 | FTTH optical fiber link testing method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311195834.8A CN116938327B (en) | 2023-09-18 | 2023-09-18 | FTTH optical fiber link testing method and system |
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| Publication Number | Publication Date |
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| CN116938327A CN116938327A (en) | 2023-10-24 |
| CN116938327B true CN116938327B (en) | 2024-01-26 |
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