FABRY PEROT SINGLE MODE FIBRE INTERFEROMETER

摘要

An optical fibre interferometer for sensing an incident wave comprises an optical fibre (10) and a polymer film (14) against one end (12) of the fibre. The two opposite faces (16, 18) of the polymer film provide reflecting surfaces of the interferometer, and the optical thickness of the film is modulated by the incident wave (6). The optical fibre (10) comprises a single mode fibre. The device has good stability and small active area, enabling omnidirectional response, even at high frequencies.