Simulation and application for reflector deformation of optical fiber fabry-perot cavity

A mathematical model for optical fiber Fabry-Perot (F-P) cavity with an arc reflector was proposed. The arc end was assimilated to a step-like model which was structured by annular plane-end fiber F-P cavities. The mathematical model was educed by integral of the annular plane-end fiber F-P cavities and multiple-beam interference theory. Simulation was done based on the mathematical model. When the curvature radius of the arc end is larger than 300 μm, detection is feasible by utilizing arc deformation of the end. To ensure high sensitivity and stable working point, the arc-deformed end must induce large cavity-length range, deform in small radian and has invariable stable state.