Buried optical cable fault point positioning system combining breakpoint detection and vibration detection

Abstract

The invention relates to a photoelectric detection system, in particular to a buried optical cable fault point positioning system combining breakpoint detection and vibration detection, which comprises a distributed feedback laser, a narrow-band laser, an optical switch, an acousto-optic modulator, a driver, a circulator, a detected buried optical cable, a photoelectric detector, an acquisition card and a computer, the beneficial effects of the invention are that an optical time domain reflection test technology and a phase-sensitive optical time domain reflection test technology are multiplexed during an optical cable fault point position test; and according to the sequence of optical cable fault point positioning and optical cable vibration position positioning, the buried optical cablefault point positioning is realized by searching the ground position where the ground knocking position and the fault point position coincide.

Description

technical field [0001] The invention relates to a photoelectric detection system, in particular to a buried optical cable fault location system combining breakpoint detection and vibration detection. Background technique [0002] Optical fiber communication technology is based on laser transmission. Laser transmission requires optical cables as carriers, and the on-off of optical cables affects the normal transmission of optical fiber communication information. With the development of optical fiber communication technology, more and more optical cables are laid underground, and the mileage of laying is getting longer and longer, which makes it more and more difficult for engineers to determine the location of the fault point of the optical cable. It takes a lot of money and energy to find the location of the fault point, making it difficult to guarantee the repair efficiency of the cable fault, and the financial and manpower costs are high. For this reason, people need an in...

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Problems solved by technology

This method requires an optical cable wiring diagram for comparison. If there is no optical cable wiring diagram, it is difficult to find the specific location of the fault point, and based on this method, only the approximate location of the fault point on the ground is detected. Finding the point of failure is a waste of time, manpower and material resources

[0006] Among the buried optical cable fault point detection technologies, the national invention patent application "buried communication optical cable fault location device and method on the ground" (public date: 2018.06.15) and "a vibration test for the accurate positioning of the buried optical cable fault on the ground" "Device" (public date: 2018.09.07) all use the phase-sensitive optical time-domain reflectometry detector to detect the fault point of the optical cable: firstly, the buried optical cable is vibrated by continuously hitting the ground, and then the phase-sensitive optical time-domain reflectometry detector is used to detect The vibration state of the optical cable and the location of the fault point of the optical cable. This detection method needs to continuously tap on the optical cable line to find the approximate location of the fault point of the optical cable without knowing the approximate location of the optical cable fault point. This process is also very wasteful. time, human and material

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