In order to identify the relationship between fiber unit strain and fiber composite submarine cable strain so as to accurately measure the submarine cable strain distribution by using the distributed optical fiber sensing technology

this paper conducts mathematical modeling for and simulation of the said relationship.It first establishes the mathematical model on the basis of analyzing the submarine cable structure and the finite element model by rationally simplifying the submarine cable structure.Then it conducts the linear stretching numerical calculation and compares the calculation results and mathematical model.The results show that the they are in agreement

in other work

the fiber unit strain is linear with the submarine cable strain and smaller than the latter

which means we can use fiber unit strain to calculate the submarine cable strain and provide a theoretical basis for monitoring the state of submarine cables on the basis of distributed optical fiber strain measurements.