WO2016134545A1 - 一种补偿光时域反射仪发端信号误差的方法和装置 - Google Patents

一种补偿光时域反射仪发端信号误差的方法和装置 Download PDF

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Publication number
WO2016134545A1
WO2016134545A1 PCT/CN2015/073428 CN2015073428W WO2016134545A1 WO 2016134545 A1 WO2016134545 A1 WO 2016134545A1 CN 2015073428 W CN2015073428 W CN 2015073428W WO 2016134545 A1 WO2016134545 A1 WO 2016134545A1
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sequence
fiber
optical
iteration
attenuation curve
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PCT/CN2015/073428
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English (en)
French (fr)
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黄延穗
罗小东
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2015/073428 priority Critical patent/WO2016134545A1/zh
Priority to EP15882983.8A priority patent/EP3255803B1/en
Priority to ES15882983T priority patent/ES2727161T3/es
Priority to CN201580055449.0A priority patent/CN106797231B/zh
Publication of WO2016134545A1 publication Critical patent/WO2016134545A1/zh
Priority to US15/687,220 priority patent/US10135524B2/en

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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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to a method and apparatus for compensating for a signal error of an optical time domain reflectometer.
  • an optical time domain reflectometer (English: Optical Time Domain Reflectometer; OTDR) is an effective method for monitoring fiber links. Because the fiber will be reflected and attenuated when transmitting light pulses due to Rayleigh scattering, fiber connectors, fusion splices, and the like.
  • the performance of the fiber that the OTDR can detect (for example, the length of the fiber) is affected by the attenuation coefficient of the fiber, and does not accurately reflect the detection performance of the OTDR. Therefore, the detection performance of the OTDR is generally described by the dynamic range.
  • the dynamic range of the OTDR characterizes the maximum optical loss that can be analyzed by the OTDR when the backscattering level of the OTDR port drops to a specific noise level.
  • the OTDR emits a light pulse to the fiber to be tested, and simultaneously detects the reflected and attenuated reflected light reflected from the fiber, and obtains information such as reflection and attenuation of the fiber by the intensity and time relationship of the reflected light pulse, that is, the fiber attenuation curve. Therefore, the detection of the performance of the optical fiber is realized, and the dynamic range of the OTDR is obtained.
  • the light pulses emitted by the OTDR are divided into single light pulses and multiple light pulses.
  • the OTDR For a single optical pulse emitted by the OTDR, the OTDR emits a single optical pulse to the optical fiber to be tested, and detects the reflected light of the optical pulse to obtain a fiber attenuation curve of the detected reflected light.
  • the OTDR transmits a pseudo-random (English: Pseudo-random; English: PN) optical pulse sequence (ie, PN sequence) to the fiber to be tested, and detects the optical signal reflected by the optical fiber. No., the detected optical signal is correlated with the PN sequence to obtain a fiber attenuation curve.
  • a pseudo-random optical pulse sequence ie, PN sequence
  • the emitted multi-light pulse occurs due to the filtering, noise, and the like of the transmitter. Distortion causes the weaker reflected signal at the far end of the fiber to be submerged in the noise, which reduces the performance of the fiber that the OTDR can detect, and also means that the dynamic range of the OTDR is degraded.
  • the embodiments of the present invention provide a method and apparatus for compensating for the error of the originating signal of the optical time domain reflectometer, which is used to solve the problem of the current dynamic range of the multi-pulse OTDR.
  • a method for compensating for an error in an originating signal of an optical time domain reflectometer comprising:
  • the performance of the fiber under test is determined according to the fiber attenuation curve function obtained in this iteration.
  • determining that the fiber attenuation curve function obtained by the iteration satisfies a set condition includes:
  • the method further includes:
  • the actual signal sequence of the PN sequence, the theoretical signal sequence of the PN sequence, and the fiber attenuation curve function calculated by the previous iteration calculate the compensation value of the optical signal that is attenuated during the reflection of the fiber under test.
  • the calculation is obtained according to the difference between the signal sequence and the optical fiber attenuation function calculated by the previous previous iteration
  • the compensation value of the optical signal that is attenuated during the reflection of the fiber under test includes:
  • the calculating, according to the actual signal sequence of the optical signal, the compensation value, and the theoretical signal sequence of the PN sequence includes:
  • the iteration is calculated according to the theoretical signal sequence of the optical signal and the theoretical signal sequence of the PN sequence
  • the obtained fiber attenuation curve function includes:
  • the fiber attenuation curve function calculated by the adjacent previous iteration includes at least one of the following fiber attenuation curve functions:
  • an apparatus for compensating for an error in an originating signal of an optical time domain reflectometer including:
  • a measuring unit configured to detect an actual signal sequence of the pseudo random optical pulse PN sequence transmitted by the transmitter to the optical fiber to be tested, and an actual signal sequence received by the receiver and reflected by the optical fiber under test;
  • a compensation unit configured to calculate, according to an actual signal sequence of the PN sequence, a theoretical signal sequence of the PN sequence, and a fiber attenuation curve function calculated by an adjacent previous iteration, that attenuation occurs during reflection of the fiber under test The compensation value of the optical signal;
  • a calculating unit configured to calculate a fiber attenuation curve function obtained by the iteration according to an actual signal sequence of the optical signal, the compensation value, and a theoretical signal sequence of the PN sequence;
  • the determining unit is configured to determine the performance of the fiber under test according to the fiber attenuation curve function obtained by the iteration when determining that the fiber attenuation curve function obtained by the iteration satisfies the set condition.
  • the determining unit is specifically configured to determine that the fiber attenuation curve function obtained by the iteration meets a set condition, including:
  • the determining unit is further configured to: when the difference is not less than a set threshold, determine the current time The iteratively obtained fiber attenuation curve function does not satisfy the set condition, and triggers the operation of calculating the compensation value of the optical signal attenuated in the next reflection of the fiber under test by using the fiber attenuation curve function obtained by this iteration.
  • the compensation a unit, specifically for calculating a difference between an actual signal sequence of the PN sequence and a theoretical signal sequence of the PN sequence;
  • the compensation unit is configured to calculate, according to the difference between the signal sequence and the previous previous iteration
  • the obtained fiber attenuation function calculates a compensation value of the optical signal that is attenuated during the reflection of the fiber under test, and includes:
  • the calculating unit is configured to calculate, according to an actual signal sequence of the optical signal and the compensation value, a theoretical signal sequence of the optical signal;
  • the calculating unit is specifically configured to: according to the theoretical signal sequence of the optical signal and the PN sequence The theoretical signal sequence, calculate the fiber attenuation curve function obtained in this iteration, including:
  • the fiber attenuation curve function calculated by the adjacent previous iteration includes at least one of the following fiber attenuation curve functions:
  • an apparatus for compensating for an error in an originating signal of an optical time domain reflectometer including:
  • a photodetection device for detecting an actual signal sequence of a pseudo-random optical pulse PN sequence transmitted by the transmitter to the optical fiber under test and an actual signal sequence of the optical signal received by the receiver and reflected by the optical fiber under test;
  • a processing device configured to calculate, according to an actual signal sequence of the PN sequence detected by the photodetecting device, a theoretical signal sequence of the PN sequence, and a fiber attenuation curve function calculated by an adjacent previous iteration, a compensation value of the optical signal that is attenuated during reflection of the fiber to be tested;
  • the performance of the fiber under test is determined according to the fiber attenuation curve function obtained in this iteration.
  • the processing device determines that the fiber attenuation curve function obtained by the iteration meets the set condition, and includes:
  • the processing device is further configured to: when the difference is not less than a set threshold, determine the current time The iteratively obtained fiber attenuation curve function does not satisfy the set condition, and triggers the operation of calculating the compensation value of the optical signal attenuated in the next reflection of the fiber under test by using the fiber attenuation curve function obtained by this iteration.
  • the processing The device according to the actual signal sequence of the PN sequence, the theoretical signal sequence of the PN sequence
  • the compensation function of the optical signal that is attenuated during the reflection of the fiber under test is calculated by the column and the fiber attenuation curve function calculated by the previous iteration, including:
  • the processing device according to the difference between the signal sequence and the optical attenuation of the previous last iteration a function of calculating a compensation value of the optical signal that is attenuated during the reflection of the fiber under test, including:
  • the processing device is based on an actual signal sequence of the optical signal, the compensation value, and a theory of the PN sequence
  • the signal sequence calculates the fiber attenuation curve function obtained in this iteration, including:
  • the processing device according to the theoretical signal sequence of the optical signal and the theoretical signal sequence of the PN sequence, Calculate the fiber attenuation curve function obtained in this iteration, including:
  • the fiber attenuation curve function calculated by the adjacent previous iteration includes at least one of the following fiber attenuation curve functions:
  • the embodiment of the present invention detects the actual signal sequence of the PN sequence transmitted by the transmitter to the fiber under test and the actual signal sequence of the optical signal reflected by the receiver through the fiber under test; according to the actuality of the PN sequence a signal sequence, a theoretical signal sequence of the PN sequence, and a fiber attenuation curve function calculated by an adjacent previous iteration, and calculating a compensation value of the optical signal that is attenuated during the reflection of the fiber under test; Calculating the fiber attenuation curve function obtained by this iteration by calculating the actual signal sequence of the optical signal, the compensation value, and the theoretical signal sequence of the PN; further determining whether the fiber attenuation curve function obtained in this iteration satisfies the set condition, When it is determined that the fiber attenuation curve function obtained in this iteration satisfies the set condition, the performance of the fiber under test is determined according to the fiber attenuation curve function obtained in this iteration.
  • the reflected information of the PN sequence is used to compensate the reflected optical signal in real time, and the dynamics of the optical time domain reflectometer is effectively improved by using an iterative algorithm. range.
  • FIG. 1 is a schematic flow chart of a method for compensating for an error of an originating signal of an optical time domain reflectometer according to the present invention
  • FIG. 2 is a schematic structural diagram of an apparatus for compensating for an error of an originating signal of an optical time domain reflectometer according to the present invention
  • FIG. 3 is a schematic structural diagram of an apparatus for compensating for an error of an originating signal of an optical time domain reflectometer according to the present invention
  • FIG. 4 is a schematic structural view of an optical time domain reflectometer provided by the present invention.
  • an embodiment of the present invention provides a method and apparatus for compensating for an error in an originating signal of an optical time domain reflectometer, by detecting an actual signal sequence of a PN sequence transmitted by a transmitter to an optical fiber under test, and receiving by a receiver.
  • An actual signal sequence of the optical signal reflected by the fiber under test an actual signal sequence of the PN sequence, a theoretical signal sequence of the PN sequence, and a fiber attenuation curve function calculated by an adjacent previous iteration, Calculating a compensation value of the optical signal that is attenuated during the reflection of the fiber under test; calculating the current iteration according to the actual signal sequence of the optical signal, the compensation value, and the theoretical signal sequence of the PN
  • the fiber attenuation curve function further determining whether the fiber attenuation curve function obtained in this iteration satisfies the set condition, and determining the fiber attenuation curve obtained according to the iteration when determining that the fiber attenuation curve function obtained in this iteration satisfies the set condition a function that determines the performance of the fiber under test.
  • the reflected information of the PN sequence is used to compensate the reflected optical signal in real time, and the dynamics of the optical time domain reflectometer is effectively improved by using an iterative algorithm. range.
  • FIG. 1 is a schematic flow chart of a method for compensating for an error of an originating signal of an optical time domain reflectometer according to the present invention.
  • the method can be as follows.
  • Step 101 Detect the actual signal sequence of the PN sequence transmitted by the transmitter to the fiber under test and the actual signal sequence of the optical signal received by the receiver and reflected by the fiber under test.
  • the transmitter transmits a PN sequence to the fiber under test.
  • the PN sequence is a multi-light pulse.
  • the signal coupler couples the received service data with the theoretical signal sequence of the generated PN sequence to modulate the theoretical signal sequence of the PN sequence onto the service data; and modulates the service data of the theoretical signal sequence of the PN sequence. Perform electro-optical conversion and send the converted optical signal to the fiber under test.
  • the photodetection device detects the actual signal sequence of the PN sequence transmitted to the fiber under test.
  • the photoelectric detecting device detects the actual signal sequence of the optical signal reflected by the receiver through the optical fiber, and performs photoelectric conversion, amplification, and filtering on the detected optical signal.
  • Step 102 Calculate, according to an actual signal sequence of the PN sequence, a theoretical signal sequence of the PN sequence, and a fiber attenuation curve function calculated by an adjacent previous iteration, a region where attenuation occurs during reflection of the fiber under test. The compensation value of the optical signal.
  • step 102 first, a difference is calculated based on an actual signal sequence of the PN sequence and a theoretical signal sequence of the PN sequence.
  • the actual signal sequence of the PN sequence and the theoretical signal sequence of the PN sequence are input to a subtractor, and the difference is calculated by a subtractor.
  • the difference of the signal sequence calculated by the subtractor is (Ps-P).
  • the compensation value of the optical signal that is attenuated during the reflection of the fiber under test is calculated.
  • the difference between the multi-optical pulse transmitted by the transmitter and the optical signal reflected by the optical fiber received by the receiver is calculated as a function of the optical attenuation function of the optical time domain reflectometer, and the difference and the adjacent are utilized.
  • the fiber attenuation function calculated in the previous iteration calculates the compensation value of the optical signal that is attenuated during the reflection of the fiber under test.
  • the fiber attenuation curve function calculated by the adjacent previous iteration includes at least one of the following fiber attenuation curve functions: an optical fiber attenuation curve function for offline testing; pre-stored Fiber attenuation curve function.
  • the difference is calculated and adjacent to the previous time.
  • the convolution of the fiber attenuation function obtained by iterative calculation can obtain the compensation value of the optical signal that is attenuated during the reflection of the fiber under test.
  • the difference is (Ps-P)
  • the fiber attenuation function calculated by the previous iteration is f n
  • the compensation value of the optical signal that is attenuated during the reflection of the fiber under test is obtained (Ps- P)*f n .
  • Step 103 Calculate a fiber attenuation curve function obtained by this iteration according to an actual signal sequence of the optical signal, the compensation value, and a theoretical signal sequence of the PN sequence.
  • step 103 first, the actual signal sequence of the detected optical signal is compensated by using the compensation value to obtain a theoretical signal sequence of the compensated optical signal.
  • a theoretical signal sequence of the optical signal is calculated according to an actual signal sequence of the optical signal and the compensation value.
  • the fiber attenuation curve function obtained in this iteration is calculated according to the theoretical signal sequence of the optical signal and the theoretical signal sequence of the PN sequence.
  • the theoretical signal of the optical signal is obtained according to a relationship between a correlation result of a multi-light pulse transmitted by the transmitter and an optical signal reflected by the optical fiber received by the receiver and a fiber attenuation function of the optical time domain reflectometer.
  • the sequence is correlated with the theoretical signal sequence of the PN sequence to obtain a fiber attenuation curve function of the iteration.
  • the theoretical signal sequence of the optical signal the theoretical signal sequence of the PN sequence * the fiber attenuation curve function of this iteration.
  • Step 104 When it is determined that the fiber attenuation curve function obtained in this iteration satisfies the set condition, the iteration is stopped, and the performance of the fiber under test is determined according to the fiber attenuation function.
  • step 104 it is determined that the fiber attenuation curve function obtained in this iteration satisfies the set condition, including:
  • the difference is not less than the set threshold, it is determined that the fiber attenuation curve function obtained by the iteration does not satisfy the set condition, and the calculation of the attenuation curve function of the fiber obtained by using the iteration is performed to obtain the attenuation during the fiber reflection process.
  • the operation of the compensation value of the optical signal is not less than the set threshold.
  • the actual signal sequence of the PN sequence transmitted by the transmitter to the fiber under test and the actual signal sequence of the optical signal reflected by the receiver through the fiber under test are detected by the solution described in the embodiment of the present invention; Calculating the actual signal sequence of the PN sequence, the theoretical signal sequence of the PN sequence, and the fiber attenuation curve function calculated by the previous iteration, and calculating the compensation of the optical signal that is attenuated during the reflection of the fiber under test Calculating a fiber attenuation curve function obtained by the iteration according to the actual signal sequence of the optical signal, the compensation value, and the theoretical signal sequence of the PN; further determining whether the fiber attenuation curve function obtained by the iteration is satisfied The condition is set.
  • the performance of the fiber under test is determined according to the fiber attenuation curve function obtained in this iteration.
  • the reflected information of the PN sequence is used to compensate the reflected optical signal in real time, and the dynamics of the optical time domain reflectometer is effectively improved by using an iterative algorithm. range.
  • FIG. 2 is a schematic structural diagram of an apparatus for compensating for an error of an originating signal of an optical time domain reflectometer according to an embodiment of the present invention.
  • the device comprises: a measuring unit 21, a compensation unit 22, a calculating unit 23 and a determining unit 24, wherein:
  • the measuring unit 21 is configured to detect an actual signal sequence of the pseudo random optical pulse PN sequence transmitted by the transmitter to the optical fiber to be tested, and an actual signal sequence of the optical signal received by the receiver and reflected by the optical fiber under test;
  • the compensating unit 22 is configured to calculate, according to an actual signal sequence of the PN sequence, a theoretical signal sequence of the PN sequence, and a fiber attenuation curve function calculated by an adjacent previous iteration, in the reflection process of the fiber under test Attenuated compensation value of the optical signal;
  • the calculating unit 23 is configured to calculate a fiber attenuation curve function obtained by the iteration according to the actual signal sequence of the optical signal, the compensation value, and the theoretical signal sequence of the PN sequence;
  • the determining unit 24 is configured to determine the performance of the fiber under test according to the fiber attenuation curve function obtained by the iteration when determining that the fiber attenuation curve function obtained by the iteration satisfies the set condition.
  • the determining unit 24 is specifically configured to determine that the fiber attenuation curve function obtained in this iteration satisfies the setting condition, and includes:
  • the determining unit 24 is further configured to: when the difference is not less than a set threshold, determine that the fiber attenuation curve function obtained by the iteration does not satisfy the set condition, and trigger the execution of the light obtained by using the iteration
  • the fiber attenuation curve function calculates the operation of the compensation value of the optical signal that is attenuated during the reflection of the fiber under test for the next time.
  • the compensation unit 22 is specifically configured to calculate a difference between an actual signal sequence of the PN sequence and a theoretical signal sequence of the PN sequence;
  • the compensation unit 22 is configured to calculate, according to the difference between the signal sequence and the fiber attenuation function calculated by the previous previous iteration, the compensation of the optical signal that is attenuated during the reflection of the fiber under test. Values, including:
  • the calculating unit 23 is configured to calculate a theoretical signal sequence of the optical signal according to an actual signal sequence of the optical signal and the compensation value;
  • the calculating unit 23 is configured to calculate a fiber attenuation curve function obtained by the iteration according to the theoretical signal sequence of the optical signal and the theoretical signal sequence of the PN sequence, including:
  • the fiber attenuation curve function calculated by the adjacent last iteration includes at least one of the following fiber attenuation curve functions:
  • the measurement device provided by the embodiment of the present invention may be implemented by using a software, or may be implemented by using a hardware, and is not specifically limited herein.
  • FIG. 3 is a schematic structural diagram of an apparatus for compensating for an error of an originating signal of an optical time domain reflectometer according to an embodiment of the present invention.
  • the apparatus may include a photodetection device 31 and a processing device 32, wherein:
  • the photodetection device 31 is configured to detect an actual signal sequence of the pseudo random optical pulse PN sequence transmitted by the transmitter to the optical fiber to be tested, and an actual signal sequence of the optical signal received by the receiver and reflected by the optical fiber under test;
  • the processing device 32 is configured to calculate, according to an actual signal sequence of the PN sequence detected by the photoelectric detecting device, a theoretical signal sequence of the PN sequence, and a fiber attenuation curve function calculated by an adjacent previous iteration, a compensation value of the optical signal that is attenuated during reflection of the fiber under test;
  • the performance of the fiber under test is determined according to the fiber attenuation curve function obtained in this iteration.
  • the processing device 32 determines that the fiber attenuation curve function obtained by the iteration meets the set condition, and includes:
  • the processing device 32 is further configured to: when the difference is not less than a set threshold, determine that the fiber attenuation curve function obtained by the iteration does not satisfy the set condition, and trigger the execution of the fiber obtained by using the iteration.
  • the attenuation curve function calculates the operation of the compensation value of the optical signal that is attenuated during the reflection of the fiber under test for the next time.
  • the processing device 32 is configured according to the actual signal sequence of the PN sequence, the PN The theoretical signal sequence of the sequence and the fiber attenuation curve function calculated by the previous iteration are calculated, and the compensation value of the optical signal that is attenuated during the reflection of the fiber under test is calculated, including:
  • the processing device 32 calculates, according to the difference between the signal sequence and the fiber attenuation function calculated by the previous last iteration, the compensation of the optical signal that is attenuated during the reflection of the fiber under test. Values, including:
  • the processing device 32 calculates the fiber attenuation curve function obtained by the iteration according to the actual signal sequence of the optical signal, the compensation value, and the theoretical signal sequence of the PN sequence, including:
  • the processing device 32 calculates the fiber attenuation curve function obtained by the iteration according to the theoretical signal sequence of the optical signal and the theoretical signal sequence of the PN sequence, including:
  • the fiber attenuation curve function includes at least one of the following fiber attenuation curve functions:
  • the real-time detection of the PN sequence transmitted by the transmitter end by using the device according to the embodiment of the present invention, using the detected change information of the PN sequence, real-time compensation of the reflected optical signal, and effectively improving the light by using an iterative algorithm The dynamic range of the time domain reflectometer.
  • FIG. 4 is a schematic structural diagram of an optical time domain reflectometer according to an embodiment of the present invention.
  • the optical time domain reflectometer according to the embodiment of the present invention includes a data processing module 41, a service data module 42, a signal coupling module 43, an electro-optic modulation module 44, a coupler 45, a first photodetection module 46, and a first analog-to-digital conversion.
  • the data processing module 41 has the functions of the device described in the embodiment of the present invention.
  • the data processing module 41 may include a PN sequence generating unit 51, a first signal sampling unit 52, a second signal sampling unit 53, a first subtractor 54, a second subtractor 55, a convolution processor 56, and a correlation.
  • the service data module 42 is configured to generate service data, and send the generated service data to the data processing module 41 and the signal coupling module 43.
  • the signal coupling module 43 is configured to couple the received service data with the PN sequence generated by the PN sequence generating unit 51 in the data processing module 41, so that the PN sequence is modulated onto the service data.
  • the electro-optic modulation module 44 is configured to perform electrical-to-optical conversion of the service data modulated by the signal coupling module 43 with the PN sequence, and send it to the optical fiber under test through the coupler 45.
  • a first photodetection module 46 configured to receive an actual signal sequence of the optical signal reflected by the fiber under test from the receiving end of the coupler 45, and perform analog-to-digital conversion by the first analog-to-digital converter 47.
  • the signal is sent to the first signal sampling unit 52 in the data processing module 41.
  • the second photodetection module 48 is configured to detect an actual signal sequence of the PN sequence transmitted to the optical fiber to be tested from the transmitting end of the coupler 45, and perform analog-to-digital conversion by the second analog-to-digital converter 49, and then send the data to the data processing. Module 41.
  • the first subtractor 54 is configured to perform a difference operation on the theoretical signal sequence of the PN sequence generated in the PN sequence generating unit 51 and the actual signal sequence of the PN sequence collected in the second signal sampling unit 53 to obtain a difference, and The difference is sent to convolution processor 56.
  • the convolution processor 56 is configured to calculate, according to the difference and the fiber attenuation curve function calculated by the adjacent last iteration stored in the second fiber function memory 59, the attenuation occurring during the reflection of the fiber under test The compensation value of the optical signal.
  • the second subtractor 55 is configured to calculate the compensation value calculated by the convolution processor 56 and the actual signal sequence of the optical signal collected by the first signal sampling unit 52 to obtain a theoretical signal sequence of the optical signal.
  • the correlation operator 57 is configured to calculate a theoretical signal sequence of the PN sequence generated by the PN sequence generating unit 51 and the second subtractor 55 to obtain a theoretical signal sequence of the optical signal, and calculate a fiber attenuation curve function obtained by the iteration. And obtaining the obtained fiber attenuation curve function into the first fiber function memory 58.
  • the third subtractor 60 is configured to calculate the fiber attenuation curve function obtained by the current iteration stored in the first fiber function memory 58 and the fiber attenuation curve function calculated by the adjacent previous iteration stored in the second fiber function memory 59. The difference between the two is sent to the controller 61.
  • the controller 61 is configured to compare the difference with a set threshold; when the difference is less than a set threshold, determine that the fiber attenuation curve function obtained in this iteration satisfies a set condition, and determines the iteration When the obtained fiber attenuation curve function satisfies the set condition, the performance of the fiber under test is determined according to the fiber attenuation curve function obtained in this iteration;
  • the trigger convolution processor When the difference is not less than the set threshold, determining that the fiber attenuation curve function obtained in this iteration does not satisfy the set condition, the trigger convolution processor performs the fiber attenuation curve function obtained by using the iteration to calculate the next time in the The operation of the compensation value of the optical signal that is attenuated during the reflection of the fiber under test.
  • the fiber attenuation curve function obtained in this iteration does not satisfy the set condition, and the fiber attenuation curve function obtained in this iteration is sent by the first fiber function memory 58. Giving the second fiber function memory 59 and updating the second fiber function storage The fiber attenuation curve function calculated in the last iteration stored in the device 59.
  • embodiments of the present invention can be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can 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, etc.) including computer usable program code.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种补偿光时域反射仪发端信号误差的方法，包括：探测发射器向被测光纤中发送的PN序列的实际信号序列以及接收器接收到的经过被测光纤反射回来的光信号的实际信号序列（101）；根据PN序列的实际信号序列、PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在被测光纤反射过程中发生衰减的所述光信号的补偿值（102）；根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数（103）；在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能（104）。还提供了一种补偿光时域反射仪发端信号误差的装置。

Description

一种补偿光时域反射仪发端信号误差的方法和装置 技术领域
本发明涉及光通信技术领域，尤其涉及一种补偿光时域反射仪发端信号误差的方法和装置。
背景技术
在光通信网络中，光时域反射仪(英文：Optical Time Domain Reflectometer；缩写：OTDR)是一种有效的监测光纤链路的方法。由于光纤会因为瑞利散射、光纤接头、熔接点等原因，在传输光脉冲时会产生反射、衰减。
OTDR所能探测的光纤的性能(例如：光纤的长度)受到光纤衰减系数的影响，并不能准确反映OTDR的探测性能，因此，一般通过动态范围来描述OTDR的探测性能。
其中，OTDR的动态范围表征从OTDR端口的背向散射级别下降到特定噪声级别时OTDR所能分析的最大光损耗。
例如，OTDR向待测光纤发射光脉冲，同时探测从光纤中反射回来的发生反射、衰减的反射光，通过反射光脉冲的强度与时间关系，获得光纤的反射、衰减等信息，即光纤衰减曲线，从而实现对光纤性能的探测，得到OTDR的动态范围。
具体地，OTDR发射的光脉冲分为单光脉冲和多光脉冲。
对于OTDR发射的单光脉冲，OTDR向待测光纤发射单个光脉冲，探测该光脉冲的反射光，获得探测到的反射光的光纤衰减曲线。
但是，在探测光纤性能时，存在需要关闭该波段的光信号，即中断数据业务的缺陷。
对于OTDR发射的多光脉冲，OTDR向待测光纤发射伪随机(英文：Pseudo-random；英文：PN)光脉冲序列(即PN序列)，探测光纤反射的光信 号，将探测到的光信号与PN序列做相关计算，得到光纤衰减曲线。
然而，虽然在探测光纤性能的时候不需要中断数据业务，实现了对光纤性能的实时检测，但是对于OTDR发射的多光脉冲，由于发射器的滤波、噪声等原因，使发射的多光脉冲发生畸变，导致光纤远端的较弱的反射信号被淹没在噪声中，使OTDR所能探测到的光纤的性能下降，也同时意味着OTDR的动态范围下降。
发明内容
有鉴于此，本发明实施例提供了一种补偿光时域反射仪发端信号误差的方法和装置，用于解决目前存在的多脉冲OTDR的动态范围下降的问题。
第一方面，提供了一种补偿光时域反射仪发端信号误差的方法，包括：
探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
结合本发明的第一方面，在第一方面的第一种可能的实施方式中，确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
将所述差值与设定阈值进行比较；
当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
结合第一方面的第一种可能的实施方式，在第一方面的第二种可能的实施方式中，所述方法还包括：
当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
结合第一方面，或者结合第一方面的第一种可能的实施方式，或者结合第一方面的第二种可能的实施方式，在第一方面的第三种可能的实施方式中，根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
结合第一方面的第三种可能的实施方式，在第一方面的第四种可能的实施方式中，根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
结合第一方面，或者结合第一方面的第一种可能的实施方式，或者结合第一方面的第二种可能的实施方式，或者结合第一方面的第三种可能的实施方式，或者结合第一方面的第四种可能的实施方式，在第一方面的第五种可能的实施方式中，根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
结合第一方面的第五种可能的实施方式，在第一方面的第六种可能的实施方式中，根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
结合第一方面，或者结合第一方面的第一种可能的实施方式，或者结合第一方面的第二种可能的实施方式，或者结合第一方面的第三种可能的实施方式，或者结合第一方面的第四种可能的实施方式，或者结合第一方面的第五种可能的实施方式，或者结合第一方面的第六种可能的实施方式，在第一方面的第七种可能的实施方式中，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：
离线测试的光纤衰减曲线函数；
预先存储的光纤衰减曲线函数。
第二方面，提供了一种补偿光时域反射仪发端信号误差的装置，包括：
测量单元，用于探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
补偿单元，用于根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
计算单元，用于根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
确定单元，用于在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
结合本发明的第二方面，在第二方面的第一种可能的实施方式中，所述确定单元具体用于确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
将所述差值与设定阈值进行比较；
当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
结合第二方面的第一种可能的实施方式，在第二方面的第二种可能的实施方式中，所述确定单元，还用于当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
结合第二方面，或者结合第二方面的第一种可能的实施方式，或者结合第二方面的第二种可能的实施方式，在第二方面的第三种可能的实施方式中，所述补偿单元，具体用于计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
结合第二方面的第三种可能的实施方式，在第二方面的第四种可能的实施方式中，所述补偿单元，具体用于根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
结合第二方面，或者结合第二方面的第一种可能的实施方式，或者结合第二方面的第二种可能的实施方式，或者结合第二方面的第三种可能的实施方式，或者结合第二方面的第四种可能的实施方式，在第二方面的第五种可能的实施方式中，所述计算单元，具体用于根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
结合第二方面的第五种可能的实施方式，在第二方面的第六种可能的实施方式中，所述计算单元，具体用于根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
结合第二方面，或者结合第二方面的第一种可能的实施方式，或者结合第二方面的第二种可能的实施方式，或者结合第二方面的第三种可能的实施方式，或者结合第二方面的第四种可能的实施方式，或者结合第二方面的第五种可能的实施方式，或者结合第二方面的第六种可能的实施方式，在第二方面的第七种可能的实施方式中，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：
离线测试的光纤衰减曲线函数；
预先存储的光纤衰减曲线函数。
第三方面，提供了一种补偿光时域反射仪发端信号误差的装置，包括：
光电检测设备，用于探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
处理设备，用于根据所述光电检测设备探测到的所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
根据所述光电检测设备探测到的所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
结合本发明的第三方面，在第三方面的第一种可能的实施方式中，所述处理设备确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
将所述差值与设定阈值进行比较；
当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
结合第三方面的第一种可能的实施方式，在第三方面的第二种可能的实施方式中，所述处理设备，还用于当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
结合第三方面，或者结合第三方面的第一种可能的实施方式，或者结合第三方面的第二种可能的实施方式，在第三方面的第三种可能的实施方式中，所述处理设备根据所述PN序列的实际信号序列、所述PN序列的理论信号序 列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
结合第三方面的第三种可能的实施方式，在第三方面的第四种可能的实施方式中，所述处理设备根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
结合第三方面，或者结合第三方面的第一种可能的实施方式，或者结合第三方面的第二种可能的实施方式，或者结合第三方面的第三种可能的实施方式，或者结合第三方面的第四种可能的实施方式，在第三方面的第五种可能的实施方式中，所述处理设备根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
结合第三方面的第五种可能的实施方式，在第三方面的第六种可能的实施方式中，所述处理设备根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
结合第三方面，或者结合第三方面的第一种可能的实施方式，或者结合第三方面的第二种可能的实施方式，或者结合第三方面的第三种可能的实施方式，或者结合第三方面的第四种可能的实施方式，或者结合第三方面的第五种可能的实施方式，或者结合第三方面的第六种可能的实施方式，在第三方面的第七种可能的实施方式中，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：
离线测试的光纤衰减曲线函数；
预先存储的光纤衰减曲线函数。
本发明实施例通过探测发射器向被测光纤中发送的PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；根据所述光信号的实际信号序列、所述补偿值和所述PN的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；进一步地判断本次迭代得到的光纤衰减曲线函数是否满足设定条件，在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。这样，通过对发射器端发送的PN序列的实时检测，利用检测得到的PN序列的变化信息，对反射回来的光信号进行实时补偿，并借助迭代算法，有效地提升光时域反射仪的动态范围。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明提供的一种补偿光时域反射仪发端信号误差的方法的流程示意图；
图2为本发明提供的一种补偿光时域反射仪发端信号误差的装置的结构示意图；
图3为本发明提供的一种补偿光时域反射仪发端信号误差的装置的结构示意图；
图4为本发明提供的一种光时域反射仪的结构示意图。
具体实施方式
为了实现本发明的目的，本发明实施例提供了一种补偿光时域反射仪发端信号误差的方法和装置，通过探测发射器向被测光纤中发送的PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；根据所述光信号的实际信号序列、所述补偿值和所述PN的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；进一步地判断本次迭代得到的光纤衰减曲线函数是否满足设定条件，在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
这样，通过对发射器端发送的PN序列的实时检测，利用检测得到的PN序列的变化信息，对反射回来的光信号进行实时补偿，并借助迭代算法，有效地提升光时域反射仪的动态范围。
下面结合说明书附图对本发明各个实施例作进一步地详细描述。显然， 所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
如图1所示，为本发明提供的一种补偿光时域反射仪发端信号误差的方法的流程示意图。所述方法可以如下所述。
步骤101：探测发射器向被测光纤中发送的PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列。
在步骤101中，发射器向被测光纤中发送PN序列。该PN序列为多光脉冲。
具体地，信号耦合器将接收到的业务数据和生成的PN序列的理论信号序列进行耦合，使PN序列的理论信号序列调制到业务数据上；并将调制有PN序列的理论信号序列的业务数据进行电光转换，并将转换后的光信号发送至被测光纤中。
光电检测设备探测向被测光纤中发送的PN序列的实际信号序列。
同时，光电检测设备探测接收器接收到的经过被测光纤反射回来的光信号的实际信号序列，并对探测到的光信号进行光电转换、放大、滤波处理。
步骤102：根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
在步骤102中，首先，根据所述PN序列的实际信号序列和所述PN序列的理论信号序列，计算得到差值。
具体地，将所述PN序列的实际信号序列和所述PN序列的理论信号序列输入至减法器，利用减法器计算得到差值。
例如：若所述PN序列的理论信号序列为P，检测得到的所述PN序列的实际信号序列为Ps，那么利用减法器计算得到的信号序列的差值为(Ps-P)。
其次，根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
具体地，根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
这里需要说明的是，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：离线测试的光纤衰减曲线函数；预先存储的光纤衰减曲线函数。
其中，发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系可以表示为：接收器接收到的反射光信号＝发射器发送的多光脉冲与光纤衰减函数的卷积。
也就是说，在计算得到发射器发送的多光脉冲的信号序列的差值时，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算所述差值与相邻上一次迭代计算得到的光纤衰减函数的卷积，即可得到在被测光纤反射过程中发生衰减的所述光信号的补偿值。
例如：若差值为(Ps-P)，相邻上一次迭代计算得到的光纤衰减函数为fn，那么得到在被测光纤反射过程中发生衰减的所述光信号的补偿值为(Ps-P)*fn。
步骤103：根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
在步骤103中，首先，利用所述补偿值对探测到的所述光信号的实际信号序列进行补偿，得到补偿后的所述光信号的理论信号序列。
具体地，根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列。
例如：计算所述光信号的实际信号序列与所述补偿值的差值，将得到差值为所述光信号的理论信号序列。
假设所述光信号的实际信号序列为Rs，所述补偿值为(Ps-P)*fn，那么所述光信号的理论信号序列为Rs-(Ps-P)*fn。
其次，根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
具体地，根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
即所述光信号的理论信号序列＝所述PN序列的理论信号序列*本次迭代的光纤衰减曲线函数。
步骤104：在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，停止迭代，根据所述光纤衰减函数，确定被测光纤的性能。
在步骤104中，确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
将所述差值与设定阈值进行比较；
当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算得到在光纤反射过程中发生衰减的所述光信号的补偿值的操作。
通过本发明实施例所描述的方案，探测发射器向被测光纤中发送的PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；根据所述光信号的实际信号序列、所述补偿值和所述PN的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；进一步地判断本次迭代得到的光纤衰减曲线函数是否满足 设定条件，在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。这样，通过对发射器端发送的PN序列的实时检测，利用检测得到的PN序列的变化信息，对反射回来的光信号进行实时补偿，并借助迭代算法，有效地提升光时域反射仪的动态范围。
图2为本发明实施例提供的一种补偿光时域反射仪发端信号误差的装置的结构示意图。所述装置包括：测量单元21、补偿单元22、计算单元23和确定单元24，其中：
测量单元21，用于探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
补偿单元22，用于根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
计算单元23，用于根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
确定单元24，用于在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
具体地，所述确定单元24具体用于确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
将所述差值与设定阈值进行比较；
当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
所述确定单元24，还用于当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光 纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
可选地，所述补偿单元22，具体用于计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
所述补偿单元22，具体用于根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
可选地，所述计算单元23，具体用于根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
所述计算单元23，具体用于根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
可选地，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：
离线测试的光纤衰减曲线函数；
预先存储的光纤衰减曲线函数。
需要说明的是，本发明实施例提供的测量装置可以通过软件方式实现，也可以通过硬件方式实现，这里不做具体限定。
图3为本发明实施例提供的一种补偿光时域反射仪发端信号误差的装置的结构示意图。所述装置可以包含光电检测设备31和处理设备32，其中：
光电检测设备31，用于探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
处理设备32，用于根据所述光电检测设备探测到的所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
根据所述光电检测设备探测到的所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
可选地，所述处理设备32确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
将所述差值与设定阈值进行比较；
当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
可选地，所述处理设备32，还用于当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
可选地，所述处理设备32根据所述PN序列的实际信号序列、所述PN 序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
可选地，所述处理设备32根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
可选地，所述处理设备32根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
可选地，所述处理设备32根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
可选地，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光 纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：
离线测试的光纤衰减曲线函数；
预先存储的光纤衰减曲线函数。
通过本发明实施例所述的装置对发射器端发送的PN序列的实时检测，利用检测得到的PN序列的变化信息，对反射回来的光信号进行实时补偿，并借助迭代算法，有效地提升光时域反射仪的动态范围。
图4为本发明实施例提供的一种光时域反射仪的结构示意图。本发明实施例中所述的光时域反射仪包含数据处理模块41、业务数据模块42、信号耦合模块43、电光调制模块44、耦合器45、第一光电检测模块46、第一模数转换器47、第二光电检测模块48、第二模数转换器49。
其中，数据处理模块41具备本发明实施例中所描述的装置的功能。
具体地，所述数据处理模块41可以包含PN序列生成单元51、第一信号采样单元52、第二信号采样单元53、第一减法器54、第二减法器55、卷积处理器56、相关运算器57、第一光纤函数存储器58、第二光纤函数存储器59、第三减法器60和控制器61。
业务数据模块42，用于产生业务数据，并将产生的业务数据发送给数据处理模块41和信号耦合模块43。
信号耦合模块43，用于将接收到的业务数据和数据处理模块41中PN序列生成单元51产生的PN序列进行耦合，使得PN序列调制到业务数据上。
电光调制模块44，用于将信号耦合模块43调制有PN序列的业务数据进行电光转换，通过耦合器45发送给被测光纤。
第一光电检测模块46，用于从耦合器45的接收端接收到的经过所述被测光纤反射回来的光信号的实际信号序列，并通过第一模数转换器47进行模数转换后，发送给数据处理模块41中第一信号采样单元52。
第二光电检测模块48，用于从耦合器45的发送端探测向被测光纤中发送的PN序列的实际信号序列，并通过第二模数转换器49进行模数转换后，发送给数据处理模块41中。
第一减法器54，用于将PN序列生成单元51中生成的PN序列的理论信号序列和第二信号采样单元53中采集到的PN序列的实际信号序列进行作差运算，得到差值，并将该差值发送给卷积处理器56。
卷积处理器56，用于根据所述差值和第二光纤函数存储器59中存储的相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
第二减法器55，用于将卷积处理器56计算得到的补偿值与第一信号采样单元52采集到的所述光信号的实际信号序列进行计算，得到所述光信号的理论信号序列。
相关运算器57，用于将PN序列生成单元51中生成的PN序列的理论信号序列与第二减法器55计算得到所述光信号的理论信号序列，计算得到本次迭代得到的光纤衰减曲线函数，并将得到的光纤衰减曲线函数存储至第一光纤函数存储器58中。
第三减法器60，用于计算第一光纤函数存储器58中存储的本次迭代得到的光纤衰减曲线函数与第二光纤函数存储器59中存储的相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值，并将该差值发送给控制器61。
控制器61，用于将所述差值与设定阈值进行比较；当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件，并在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能；
当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发卷积处理器执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
需要说明的是，当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，本次迭代得到的光纤衰减曲线函数由第一光纤函数存储器58发送给第二光纤函数存储器59，并更新第二光纤函数存储 器59中存储的相邻上一次迭代计算得到的光纤衰减曲线函数。
本领域的技术人员应明白，本发明的实施例可提供为方法、装置(设备)、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、装置(设备)和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (24)

  1. 一种补偿光时域反射仪发端信号误差的方法，其特征在于，包括：
    探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
    根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
    根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
    在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
  2. 如权利要求1所述的方法，其特征在于，确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
    计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
    将所述差值与设定阈值进行比较；
    当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
  3. 如权利要求2所述的方法，其特征在于，所述方法还包括：
    当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
  4. 如权利要求1至3任一项所述的方法，其特征在于，根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
    计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
    根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
  5. 如权利要求4所述的方法，其特征在于，根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
    根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
  6. 如权利要求1至5任一项所述的方法，其特征在于，根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
    根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
    根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
  7. 如权利要求6所述的方法，其特征在于，根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
    根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
  8. 如权利要求1至7任一项所述的方法，其特征在于，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤 衰减曲线函数中的至少一种：
    离线测试的光纤衰减曲线函数；
    预先存储的光纤衰减曲线函数。
  9. 一种补偿光时域反射仪发端信号误差的装置，其特征在于，包括：
    测量单元，用于探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
    补偿单元，用于根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
    计算单元，用于根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
    确定单元，用于在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
  10. 如权利要求9所述的装置，其特征在于，
    所述确定单元具体用于确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
    计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
    将所述差值与设定阈值进行比较；
    当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
  11. 如权利要求10所述的装置，其特征在于，
    所述确定单元，还用于当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
  12. 如权利要求9至11任一项所述的装置，其特征在于，
    所述补偿单元，具体用于计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
    根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
  13. 如权利要求12所述的装置，其特征在于，所述补偿单元，具体用于根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
    根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
  14. 如权利要求9至13任一项所述的装置，其特征在于，
    所述计算单元，具体用于根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
    根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
  15. 如权利要求14所述的装置，其特征在于，所述计算单元，具体用于根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
    根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的光纤衰减曲线函数。
  16. 如权利要求9至15任一项所述的装置，其特征在于，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：
    离线测试的光纤衰减曲线函数；
    预先存储的光纤衰减曲线函数。
  17. 一种补偿光时域反射仪发端信号误差的装置，其特征在于，包括：
    光电检测设备，用于探测发射器向被测光纤中发送的伪随机光脉冲PN序列的实际信号序列以及接收器接收到的经过所述被测光纤反射回来的光信号的实际信号序列；
    处理设备，用于根据所述光电检测设备探测到的所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值；
    根据所述光电检测设备探测到的所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数；
    在确定本次迭代得到的光纤衰减曲线函数满足设定条件时，根据本次迭代得到的光纤衰减曲线函数，确定所述被测光纤的性能。
  18. 如权利要求17所述的装置，其特征在于，所述处理设备确定本次迭代得到的光纤衰减曲线函数满足设定条件，包括：
    计算本次迭代得到的光纤衰减曲线函数与相邻上一次迭代计算得到的光纤衰减曲线函数之间的差值；
    将所述差值与设定阈值进行比较；
    当所述差值小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数满足设定条件。
  19. 如权利要求18所述的装置，其特征在于，
    所述处理设备，还用于当所述差值不小于设定阈值时，确定本次迭代得到的光纤衰减曲线函数不满足设定条件，触发执行利用本次迭代得到的光纤衰减曲线函数计算下一次在所述被测光纤反射过程中发生衰减的所述光信号的补偿值的操作。
  20. 如权利要求17至19任一项所述的装置，其特征在于，所述处理设 备根据所述PN序列的实际信号序列、所述PN序列的理论信号序列以及相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
    计算所述PN序列的实际信号序列和所述PN序列的理论信号序列的差值；
    根据所述差值和相邻上一次迭代计算得到的光纤衰减曲线函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
  21. 如权利要求20所述的装置，其特征在于，所述处理设备根据所述信号序列的差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值，包括：
    根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，利用所述差值和相邻上一次迭代计算得到的光纤衰减函数，计算得到在所述被测光纤反射过程中发生衰减的所述光信号的补偿值。
  22. 如权利要求17至21任一项所述的装置，其特征在于，所述处理设备根据所述光信号的实际信号序列、所述补偿值和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
    根据所述光信号的实际信号序列和所述补偿值，计算得到所述光信号的理论信号序列；
    根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数。
  23. 如权利要求22所述的装置，其特征在于，所述处理设备根据所述光信号的理论信号序列和所述PN序列的理论信号序列，计算本次迭代得到的光纤衰减曲线函数，包括：
    根据发射器发送的多光脉冲与接收器接收到的光纤反射的光信号的相关计算结果与光时域反射仪的光纤衰减函数之间的函数关系，将所述光信号的理论信号序列与所述PN序列的理论信号序列进行相关计算，得到本次迭代的 光纤衰减曲线函数。
  24. 如权利要求17至23任一项所述的装置，其特征在于，在首次触发计算补偿值时，所述相邻上一次迭代计算得到的光纤衰减曲线函数包括以下光纤衰减曲线函数中的至少一种：
    离线测试的光纤衰减曲线函数；
    预先存储的光纤衰减曲线函数。
PCT/CN2015/073428 2015-02-28 2015-02-28 一种补偿光时域反射仪发端信号误差的方法和装置 WO2016134545A1 (zh)

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