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CN-122027024-A - Online estimation method for link connection loss of optical fiber amplifier based on reflection characteristic monitoring

CN122027024ACN 122027024 ACN122027024 ACN 122027024ACN-122027024-A

Abstract

The invention discloses an on-line estimation method of link connection loss of an optical fiber amplifier based on reflection characteristic monitoring, which comprises the steps of segmenting reflection peak positions, extracting peak amplitude, peak width, front edge slope, rear edge slope and back scattered baseline difference, obtaining a connection point reflection peak shape characteristic set, refining connection point reflection characterization, improving resolution capability of connection loss identification, weakening superposition influence of amplifier gain disturbance on reflection characteristics, improving estimation stability in an active link by constructing a gain distribution parameter set and correcting the connection point reflection peak shape characteristic set, reducing candidate loss range by establishing a non-monotonic constraint relation between connection loss and return loss, reducing misjudgment probability under different connection types and end face states, completing convergence of target connection loss values by connection point position association check and consistency comparison of adjacent moments, and improving continuity and reliability of on-line estimation results.

Inventors

  • YIN QIN

Assignees

  • 江苏田信塑料光纤有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. The method for online estimating the link connection loss of the optical fiber amplifier based on reflection characteristic monitoring is characterized by comprising the following steps of: Segmenting a reflection track on the chain by utilizing the reflection peak position in the optical fiber amplifier link, extracting peak amplitude, peak width, front slope, back slope and back-scattered baseline difference of each connection point segment, and generating a connection point reflection peak shape feature set; Generating a gain distribution parameter set based on the front-back dispersion power difference of the gain disturbance section and the power inclination amount in the section in the reflection track on the chain, and correcting the reflection peak shape characteristic set of the connection point by utilizing the gain distribution parameter set to generate a corrected reflection characteristic set; Determining a candidate connection loss group and a candidate return loss group according to the correction reflection characteristic group corresponding to each connection point, and establishing a non-monotonic constraint relation between the connection loss and the return loss by combining the connection type identifier and the end face state identifier corresponding to each connection point to generate a constraint connection loss group; And carrying out connection point position association check and adjacent moment consistency comparison on the constraint connection loss group, determining a target connection loss value corresponding to each connection point, and generating a connection loss online estimation result of the optical fiber amplifier link.
  2. 2. The method for online estimating link connection loss of optical fiber amplifier based on reflection feature monitoring according to claim 1, wherein the generating of the set of connection point reflection peak shape features comprises: Screening local maximum reflection points in the reflection track on the chain, determining the local maximum reflection points with peak values higher than adjacent back scattering sections and back scattering transition areas in front of and behind the peak values as reflection peak positions, and forming a connection point position sequence according to the arrangement sequence of the reflection peak positions in the reflection track on the chain; searching positions with the reflection peak positions as centers along the reflection track on the chain in the front and rear directions of the peak respectively, wherein the positions are turned and the average amplitude difference of adjacent track sections is not increased any more, and determining the track interval between the positions obtained by searching before the peak and the positions obtained by searching after the peak as the connection point section corresponding to the connection point position; Respectively extracting the amplitude difference between the peak highest point and the back-scattered base line before the peak as peak amplitude, extracting the corresponding front-to-back distance when the amplitude in the connecting point segment reaches half of the peak highest point as peak width, extracting the amplitude change rate of the rising section before the peak as front slope, extracting the amplitude change rate of the falling section after the peak as rear slope, and extracting the difference between the average amplitude of the back-scattered transition zone after the peak and the average amplitude of the back-scattered transition zone before the peak as back-scattered base line difference after the peak; And combining peak amplitude, peak width, front edge slope, back edge slope and back-scattered baseline difference corresponding to each connection point segment according to the connection point position sequence to generate a connection point reflection peak shape characteristic group.
  3. 3. The method for online estimation of link connection loss of an optical fiber amplifier based on reflection feature monitoring of claim 2, wherein the combining comprises: And sorting peak amplitude, peak width, front edge slope, back edge slope and peak back-scattered baseline difference corresponding to each connection point segment according to the connection point position sequence, forming feature subgroups corresponding to each connection point segment according to the fixed sequence of the peak amplitude, peak width, front edge slope, back edge slope and peak back-scattered baseline difference, and sequentially arranging the feature subgroups according to the connection point position sequence to generate the connection point reflection peak-shaped feature group.
  4. 4. The method for online estimation of link connection loss of an optical fiber amplifier based on reflection feature monitoring according to claim 1 or 2, wherein the generation of the gain distribution parameter set comprises: Respectively extracting the average power of a section front back-scattered section and the average power of a section rear back-scattered section from each gain disturbance section in the reflection track on the chain, and determining the difference between the average power of the section rear back-scattered section and the average power of the section front back-scattered section as the front back-scattered power difference of the corresponding gain disturbance section; Extracting back scattered power variation and position distance between a section starting position and a section ending position of each gain disturbance section respectively, determining the back scattered power variation corresponding to the unit position distance as intra-section power inclination amount of the corresponding gain disturbance section, sequentially sequencing the front back scattered power difference and the intra-section power inclination amount according to the arrangement sequence of the gain disturbance section in the chain reflection track, forming parameter subgroups corresponding to each gain disturbance section according to the fixed sequence of the front back scattered power difference and the back intra-section power inclination amount, and sequentially arranging the parameter subgroups according to the arrangement sequence of the gain disturbance section in the chain reflection track to generate the gain distribution parameter group; Searching a track section with the back scattered power changed in a step mode and the track slope changed synchronously along the reflection track on the chain, and obtaining the gain disturbance section by searching the track section with the back scattered power difference larger than the power fluctuation amplitude of the adjacent back scattered section and the track slope different from the track slope of the adjacent back scattered section in the section.
  5. 5. The method for online estimating link connection loss of an optical fiber amplifier based on reflection feature monitoring according to claim 4, wherein the generating of the corrected reflection feature set comprises: Performing position correlation on each connection point segment and an adjacent gain disturbance segment positioned at the front side of the reflection track on the chain, extracting a front-back dispersion power difference corresponding to the correlated gain disturbance segment and an intra-segment power inclination amount; And sorting the corrected peak amplitude, peak width, front edge slope, back edge slope and peak back-scattered baseline difference according to the connection point position sequence, forming correction feature subgroups corresponding to connection point segments according to the fixed sequence of the peak amplitude, peak width, front edge slope, back edge slope and peak back-scattered baseline difference, and sequentially arranging the correction feature subgroups according to the connection point position sequence to generate the correction reflection feature group.
  6. 6. The method for online estimation of link connection loss of an optical fiber amplifier based on reflection feature monitoring according to claim 5, wherein determining a candidate connection loss group and a candidate return loss group according to the corrected reflection feature group corresponding to each connection point comprises: respectively extracting peak amplitude and back-scattered baseline difference after the peak for the corrected reflection characteristic, and determining an amplitude difference range formed between the peak amplitude and the back-scattered baseline difference after the peak as a candidate connection loss interval; the candidate connection loss intervals are ordered according to a connection point position sequence, candidate connection loss subgroups are formed according to a fixed sequence of the front interval lower limit and the rear interval upper limit, and then the candidate connection loss subgroups are sequentially arranged according to the connection point position sequence, so that candidate connection loss groups are generated; And sorting the candidate echo loss intervals according to the connection point position sequence, forming candidate echo loss subgroups according to a fixed sequence of the front interval lower limit and the rear interval upper limit, and sequentially arranging the candidate echo loss subgroups according to the connection point position sequence to generate the candidate echo loss groups.
  7. 7. The method for online estimation of link connection loss of an optical fiber amplifier based on reflection feature monitoring according to claim 6, wherein the generation of the constraint connection loss group comprises: For each constraint type, dividing the candidate return loss group into a low return loss section, a medium return loss section and a high return loss section, and setting the candidate connection loss value range to gradually decrease in the low return loss section, keep smaller fluctuation in the medium return loss section and gradually increase in the high return loss section so as to form a non-monotonic constraint section in which the connection loss increases with the return loss first and then; Substituting each candidate connection loss section in the candidate connection loss group and each candidate return loss section in the candidate return loss group into the corresponding non-monotonic constraint section, deleting the candidate connection loss section which does not fall into the non-monotonic constraint section, and reserving the candidate connection loss section corresponding to the candidate return loss section which falls into the non-monotonic constraint section; And sequencing the reserved candidate connection loss intervals according to the connection point position sequence, forming constraint connection loss subgroups according to a fixed sequence with the front interval lower limit and the rear interval upper limit, and sequentially arranging the constraint connection loss subgroups according to the connection point position sequence to generate constraint connection loss groups.
  8. 8. The method for online estimation of link connection loss of an optical fiber amplifier based on reflection feature monitoring of claim 7, wherein the determination of the constraint type comprises: sorting the connection type identifiers according to the connection point position sequence to form a connection type sequence; Sequencing the end face state identifiers according to the connection point position sequence to form an end face state sequence; forming an identification pair by using a connection type identification of each sequence in the connection type sequence and an end face state identification of the same sequence in the end face state sequence; And determining the constraint type of the corresponding connection point according to the identification pair.
  9. 9. The method for online estimating link connection loss of an optical fiber amplifier based on reflection feature monitoring according to claim 8, wherein the constraint types specifically include: When the identification pair is a planar physical contact connection type identification and a planar end face state identification, the identification pair is a planar physical contact constraint type; When the identification pair is an ultra-flat physical contact connection type identification and an ultra-flat end face state identification, the identification pair is an ultra-flat physical contact constraint type; when the identification pair is an angular physical contact connection type identification and an angular end face state identification, the identification pair is an angular physical contact constraint type; When the identification pair is a planar physical contact connection type identification and an end face offset state identification, the identification pair is a planar end face offset constraint type; When the identification pair is an ultra-flat physical contact connection type identification and an end face offset state identification, the identification pair is an ultra-flat end face offset constraint type; and when the identification pair is the angular face physical contact connection type identification and the end face offset state identification, the identification pair is the angular face end face offset constraint type.
  10. 10. The method for online estimating link loss of optical fiber amplifier based on reflection characteristic monitoring according to claim 7, wherein the generating of the online estimating result of link loss of the optical fiber amplifier link comprises: sorting the constraint connection loss groups according to the connection point position sequence, and carrying out position association check on each constraint connection loss subgroup at the current monitoring moment and the constraint connection loss subgroup at the same connection point position in the previous monitoring moment to form a connection point position association result; Respectively extracting a constraint connection loss interval of the current monitoring time and a constraint connection loss interval of the previous monitoring time from the connection point position association result, determining the overlapped interval as a check connection loss interval when the two have overlapped intervals, and determining the smaller interval width of the constraint connection loss interval of the current monitoring time and the constraint connection loss interval of the previous monitoring time as the check connection loss interval when the two have no overlapped intervals; extracting an interval median value from the checking connection loss interval, and determining the interval median value as a target connection loss value of a corresponding connection point; and sequencing the target connection loss value according to the connection point position sequence to form a connection loss result sequence, and determining the connection loss result sequence as a connection loss online estimation result of the optical fiber amplifier link.

Description

Online estimation method for link connection loss of optical fiber amplifier based on reflection characteristic monitoring Technical Field The invention relates to the technical field of optical fiber communication monitoring and optical transmission link state evaluation, in particular to an on-line estimation method for link connection loss of an optical fiber amplifier based on reflection characteristic monitoring. Background The optical fiber communication system gradually develops from early passive transmission to long-distance, high-capacity and high-power density parallel active transmission stage, the erbium-doped optical fiber amplifier, the Raman amplifier and the relay amplifying structure are common configurations in trunk transmission, metropolitan interconnection and high-loss optical paths, in the process, attenuation, connection point reflection and connection loss monitoring of an optical fiber link are gradually changed from offline testing to in-service monitoring, in the prior art, optical time domain reflection measurement is widely used for identifying event positions of connectors, fusion points, breakpoints and the like and can represent the insertion loss, propagation loss and reflection condition of the connection points, and in the active amplifying link, the OTDR is integrated into the Raman amplifying system, and a technical path for continuously monitoring the integrity of optical fiber facilities, the insertion loss and the connector back reflection is already available. However, the prior art still has obvious defects in the link scene of the optical fiber amplifier, namely, firstly, gain distribution, back-scattered power rising and track slope change introduced by the amplifier can change the local form of a reflection track, so that the peak amplitude of a connection point and real connection loss can not keep a stable corresponding relation, the estimation mode based on single reflection peak height or single loss abrupt quantity is easily influenced by amplification disturbance, secondly, more side event positioning, total loss measurement or single point reflection detection in the prior art are insufficient in joint utilization of peak shape details such as peak width, front edge slope, back-scattered baseline difference and the like, the stable identification of the connection point loss is difficult to be kept under the change of the working state of the amplifier, thirdly, the back loss and the connection loss are related, but the connection loss are not in a simple linear or monotonic corresponding relation, the reflection increase generally influences the available transmission power and can cause the rise of the measured insertion loss, but the physical contact structures such as APC, UPC and the like are not completely consistent in reflection characteristics and connection loss performance under different connection modes and different end face states, so that the single reflection quantity or single reflection quantity is adopted, the back-scattered baseline difference and the like can not easily be judged, the continuous loss can not be found out, and the continuous result can not be easily estimated, but the continuous result is easy to estimate the back-scattered loss. In summary, the existing optical fiber amplifier link reflection monitoring technology has the problems of unstable connection loss estimation, rough connection loss and return loss relation utilization and insufficient continuity of an online result under the influence of amplification disturbance, and the problems of online estimation precision and stability of connection point connection loss in an optical fiber amplifier link are solved by the present invention. Disclosure of Invention This section is intended to summarize some aspects of embodiments of the application and to briefly introduce some preferred embodiments, which may be simplified or omitted in this section, as well as the description abstract and the title of the application, to avoid obscuring the objects of this section, description abstract and the title of the application, which is not intended to limit the scope of this application. The present invention has been made in view of the above-described problems occurring in the prior art. In order to solve the technical problems, the invention provides the following technical scheme: The invention relates to an on-line estimation method for the link connection loss of an optical fiber amplifier based on reflection characteristic monitoring, which is preferable, wherein the reflection path on the link is segmented by utilizing the reflection peak position in the optical fiber amplifier link, the peak amplitude, peak width, front edge slope, back edge slope and back-scattered baseline difference of each connection point segment are extracted, and a connection point reflection peak shape characteristic group is generated; Generating a gain distribution parameter set based on