Abstract: Aiming to address the issues of flexible optical fiber laying path design in fiber optic gyroscopes, which currently relies heavily on manual operation experience, difficulty in controlling optical path stress, and low assembly efficiency, an automatic planning method for low-stress laying path of flexible optical fiber has been proposed, including single-compartment fibers and through-compartment fibers. Based on the set reference information for the laying path, including the starting connection surface, terminating connection surface, laying surface outer circle, and through-compartment hole (applicable only to through-compartment fibers), the automatic planning of low-stress flexible optical fiber laying paths is achieved. Firstly, the low-stress laying path design of the fiber optic cable is carried out based on the bending radius standard of the fiber optic cable, thereby determining the two-dimensional distribution of the fiber optic cable laying path control points. Then, according to the spatial positional relationship between the optical devices and the fiber optic cable laying plane, as well as the through-compartment hole (applicable only to through-compartment fibers), the coordinates of the path control points are discretized in the vertical axis direction. At the same time, adjustments are made to the laying path based on the length of the fiber optic cable; if the fiber optic cable length meets the coiling conditions, coiling operations are performed, ultimately achieving the planning of low-stress fiber optic cable laying paths in three-dimensional space. Based on the above design ideas, an automatic planning system for low-stress laying path of flexible optical fiber has been developed, and relevant practical application tests have been conducted, verifying the effectiveness of the method.

Key words: fiber optic gyroscope, flexible optical fiber, laying path, automatic planning