Buried optical cable fault ground locator and localization method

Abstract

The invention belongs to the optical cable fault point localization technical field and relates to a buried optical cable fault ground locator and a localization method. The locator includes an ultra-narrow linewidth laser, a distributed feedback laser, an adjustable attenuator, an optical switch, an acousto-optic modulator, an erbium-doped optical fiber amplifier, a circulator, a wavelength division multiplexer, a Raman amplifier, an avalanche photodiode, an acquisition card, a driver, and a computer. With the buried optical cable fault ground locator and the localization method of the invention adopted, the fault location of a designated optical cable can be accurately located; financial and material resources required in finding the fault location of the optical cable can be effectivelyreduced; and the optical paths of an OTDR and the phiOTDR are fully integrated, the same devices can be adopted to simultaneously realize two functions on the basis of a fact that the devices apply different parameters under different modes.

Description

Technical field [0001] The invention belongs to the technical field of optical cable fault point positioning, and relates to a ground locator for buried optical cable faults and a positioning method. Background technique [0002] With the development of communication technology, optical fiber communication network lines are becoming increasingly complex. In the face of the complex social environment, the workload of fiber optic cable maintenance has been increased. Therefore, faster and more accurate detection of the failure points of buried fiber optic cables has become a demand. [0003] Traditional optical fiber cable fault location and search often use an optical time domain reflectometer (OTDR) to measure the length and location of the fault point. OTDR is an instrument that understands the uniformity, defect, fracture, and coupling of the fiber through the analysis of the measurement curve. It uses the backscattered light generated when light propagates in the fiber to obta...

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Problems solved by technology

[0004] However, due to uncontrollable factors such as coil retention, welding, and bending during the laying of optical cables, there is often a large gap between the actual location of the fault point and the length of the optical cable at the fault point measured by the OTDR. OTDR measures the breakpoint distance, uses the measured value to reach a similar location, digs a hole to find the optical cable, and uses OTDR to continue measuring until the cable breakpoint is found. This method is inefficient and requires multiple digging and replacement during the process of finding the breakpoint location, the workload is huge and a lot of financial and material resources are wasted

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