Power fiber optic communication line fault monitoring device

Abstract

The present invention discloses an electric power optical fiber communication line fault monitoring device. The electric power optical fiber communication line fault monitoring device employs an optical time domain reflection technology to extract distributed Rayleigh scattering optical signals of the electric power optical fiber communication line, employs a coherent detection mode to improve the sensitivity, employs the logarithmic amplifier and average mode to improve the extraction efficiency of the detection signals and employs the laser frequency hopping scheme based on the pulse counting to reduce the fading noise on the time domain reflection curve. The system program of the device controls a laser driving unit, a signal transmit / receive unit and an optical switch communication control unit to realize the control of the laser output frequency, the sending of the detection optical pulse, the collection and processing of the time domain electric signals and the switching of a detected optical fiber line. The electric power optical fiber communication line fault monitoring device is compact in device structure, high in sensitivity and short in measurement time consumption, can support online monitoring, can rapidly poll all the optical fiber communication lines in a transformer substation communication machine room, and is wide in monitoring range and high in timeliness.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a power fiber optic communication line fault monitoring device for characterization, event identification and fault location of the power fiber optic communication line. Background technique [0002] The length of power optical fiber communication lines is usually between several kilometers and hundreds of kilometers, and optical time domain reflectometers are usually used for line fault monitoring. The optical time domain reflectometer adopts the optical radar principle in the optical fiber, that is, the optical time domain reflectometry technology to identify and locate the fault on the optical fiber line. Considering the importance of power communication business, in order to avoid the strong signal light pulse sent by the optical time domain reflectometer may cause nonlinear optical effect in the optical fiber line and cause the increase of the communication bit error ra...

AI Technical Summary

Problems solved by technology

However, this scheme changes the driving current of the laser synchronously during each detection pulse period to make the output frequency of the laser jump, which will increase the measurement time of the system. For example, it takes 5ms from the time when the laser drive current is changed to when the laser stabilizes the frequency output. Time, if the system measurement result is the average of 100,000 measurement results (each measurement result corresponds to 1 pulse period), then the time spent by the system in the laser frequency hopping process is 500s

This will seriously affect the efficiency of inspection of optical fiber lines in the inspection of power optical fiber lines

In addition, the current optical time domain reflectometer or coherent optical time domain reflectometer does not have a line inspection function, and secondary development and integration need to be done on the basis of it

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