Analysis of stress distribution characteristics in optical fibers of submarine cables with different structures

In order to measure fiber strain using distributed fiber strain sensing technology, the strain of three composite submarine cables is reflected. The on-line stress monitoring and intelligent early warning technology of long-distance and highprecision distributed fiber optic sensing submarine cable are studied, and the stress decoupling method of Brillouin distributed fiber based on fiber Brillouin scattering model is realized. Finite element simulation method is used to calculate conductor core strain through optical fiber strain. Combined with finite element simulation analysis, stress distribution characteristics of different stress damage modes of submarine cable such as anchor breakage, anchor hook and hanging are obtained, the alarm threshold of submarine cable stress anomaly is proposed to complete intelligent early warning of submarine cable stress anomaly. It also provides a theoretical basis for submarine cable routing and topographic information anomaly location and typical submarine cable fault diagnosis.