Gelonghui September 25th | Changyintong (688143.SH) stated on the interactive platform that our main product optical fiber rings can be widely used in aviation and aviation guidance, marine monitoring, smart grids, 5G communication, oil drilling, earthquake monitoring, rail transportation and other national defense and civil fields. It is the optical sensitive core device and important delay device in many important optical fiber sensing application systems. The company's products can be applied in the commercial aviation inertial navigation field, accurately measure the movement attitude of the carrier, and provide accurate reference data for attitude control.