Characteristic Analysis Of Highly-Birefringence Photonic Crystal Fiber Ring Resonator For Resonant Fiber Optic Gyro

It has attracted the attention of researchers to use photonic crystal fiber (PCF) in the fiber optic gyroscopes (FOG) because of its unique features: radiation insensitivity, high thermal stability, good polarization maintaining ability and low bending loss. In this paper, a PCF-based fiber ring resonator (FRR) as the key sensing component in resonant FOG (RFOG) is experimentally fabricated. The FRR is composed of 10.8 meter long highly birefringent PCF and a traditional polarization maintaining (PM) coupler with PANDA-type pigtail fiber. The resonating characteristics of PCF-based FRR are experimentally tested and as compared with the conventional PM PANDA-type FRR. It is shown that the finesse of PCF-based FRR is about 14. The impacts of structural parameters on the finesse of the PCF-based FRR are also theoretically analyzed. Moreover, the factors that influent the shot-noise limited sensitivity (SLS) of RFOG are numerically discussed. It is of great significance to optimize the structural parameters of FRR and the application of photonic crystal fiber in RFOG.