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COTDR curve smoothing and event detection method and device

A smooth and event-based technology, applied in the field of optical communication, can solve problems such as poor smoothness of processing result curves and difficulty in event detection, and achieve the effects of smooth curves, low cost, and reduced amplitude jitter

Active Publication Date: 2017-09-22
GUANGXUN SCI & TECH WUHAN
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  • Application Information

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Problems solved by technology

[0007] The present invention mainly solves the technical problems of poor processing result curve smoothness and difficult event detection in the prior art; provides a COTDR curve smoothing and event detection method

Method used

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  • COTDR curve smoothing and event detection method and device
  • COTDR curve smoothing and event detection method and device
  • COTDR curve smoothing and event detection method and device

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Embodiment

[0049] This embodiment provides a COTDR signal smoothing and event detection solution, which realizes signal jitter reduction processing and event automatic detection.

[0050] Ideally, where there are no amplifiers and event points in the COTDR measurement curve, the part of the curve representing the Rayleigh backscattered light power should be linear. Even in a noisy environment, there is a large difference in the linear correlation coefficient between the curve with the event and the curve without the event. Therefore, the linear correlation coefficient of different parts can be used as a criterion to extract and process the parts that do not contain events, so that the parts that contain events are easier to distinguish. If a segment of the curve does not contain events, then the linear fit estimate can be obtained by least squares. Using the linear fitting estimated value as the reference value of the curve and performing weighted average with the original value can smo...

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Abstract

The invention relates to a COTDR curve smoothing and event detection method and device. The method comprises the following steps: a window division step of dividing to-be-processed data into multiple data windows with a preset data segment length, and computing the linearly dependent coefficient of the data in the window; a reference value computing step of comparing the linearly dependent coefficient with the preset threshold value, taking the original data of the data window as the reference data if the linearly dependent coefficient is greater than the predetermined threshold value, or taking the original data after the smoothing processing as the reference data if the linearly dependent coefficient is less than the predetermined threshold value; a filter processing steps of performing the weighted average on the original data in the window and the reference data corresponding to the window to obtain a filter result; a wavelet decomposition step of decomposing the filter result through the wavelet, and performing the wavelet reconstruction after performing zero-setting on the low-frequency coefficient. The scheme disclosed by the invention has the advantages that the smoothing detection curve can be obtained, the amplitude jittering is lowered, and the event can be automatically detected.

Description

technical field [0001] The invention relates to a curve smoothing and event detection method and device, belonging to the field of optical communication, in particular to a COTDR curve smoothing and event detection method and device. Background technique [0002] COTDR (Coherent Optical Time Domain Reflectometry) is a coherent optical time domain reflectometer, which is mainly used for submarine optical cable detection. Since the submarine optical cable needs to measure a long distance, an optical amplifier such as an erbium-doped fiber amplifier (EDFA) is usually used to compensate the transmission loss of signal light. These optical amplifiers will generate a lot of spontaneous emission noise (ASE) when they work, so that a lot of useful information will be submerged in the noise. COTDR can solve this problem through coherent detection and effectively reduce the influence of spontaneous emission noise. [0003] A COTDR is installed at the beginning of the optical fiber t...

Claims

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Application Information

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IPC IPC(8): G06K9/00G01D5/36G01D5/353
CPCG01D5/35303G01D5/35332G01D5/36G06F2218/06
Inventor 周琪陈俊于龙卜勤练徐红春
Owner GUANGXUN SCI & TECH WUHAN
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