Stabilization of optical Fabry–Perot sensor by active feedback control of diode laser

This paper presents the design and characterization of a fiber Fabry–Perot interferometer (FFPI) acoustic wave detector with its Q point being stabilized actively. The relationship between the reflectivity of the F–P cavity facets and cavity length was theoretically analyzed, and high visibility of 100% was realized by optimized design of the F–P cavity. To prevent the drifting of the Q point, a new stabilization method by actively feedback controlling of the diode laser is proposed and demonstrated, indicating the method is simple and easy operating. Measurement shows that good tracing of Q point was effectively realized.