Optical cable circuit failure point precision locating method

Abstract

Using Brillouin reflectance technique in optical time domain adopted in the invention picks up strain information carried by Brillouin frequency drift caused by change of position information and temperature change carried in power of reflected light. Using method of combining absolute positioning with relative positioning makes successive approximation till exact location is determined finally. Comparing with prior art, the invention has features of omitting tedious calculation and additional data log, shortening time for finding out fault point of optical cable line so as to save cost. The method is general suitable method for positioning fault point applicable to optical cable line in position fixing direct burying type, aerial cable or duct optical cable.

Description

1. Technical field

[0001] The invention relates to a method for locating the fault point of an optical cable line, specifically a method of using Brillouin Optical Time Domain Reflectometry (BOTDR), combining absolute positioning and relative positioning, and successively approaching to finally realize the fault of the optical cable precise positioning of points. 2. Background technology

[0002] With the expansion of the construction scale of communication optical cable lines in my country and the aging phenomenon of existing optical cable lines over time, the possibility of failure of optical cable lines is also increasing. According to statistics, the line part accounts for 74.8% of the failures in the optical communication system, and the direct economic loss caused by the interruption of the optical cable line is 700-800 million yuan every year, which is amazing for the national economy and national defense communications. In the existing optical cable line maintenance...

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