Abstract: Fiber optic hydrophone （FOH） technology,as an advanced interdisciplinary technology integrating optics,acoustics,and materials science,demonstrates significant application potential in both military and civilian domains. Using the patent analysis method,through in-depth excavation of patent data in the field of fiber optic hydrophones,a systematic study is conducted on the global/Chinese patent application status of dual-use （military and civilian） technologies for fiber optic hydrophones. Data statistics and technical analysis of patent applications in this field are carried out from aspects such as trends in the number of patent applications,distribution of applicant countries/regions,distribution of major International Patent Classification （IPC） codes,and major patent applicants. The findings reflect the historical development and primary research directions of fiber optic hydrophone,reveals the current domestic and foreign industry development trends and future innovation trends in the field of fiber optic hydrophones,and provides an important reference for China's technological R&D,industrial layout,and integrated development in the military-civilian dual-use field of fiber optic hydrophones.

Key words: fiber optic hydrophone, patent analysis, military-civilian dual-use