Noise analysis of hollow core photonic crystal fiber optic gyroscope

Abstract

In this paper, the noise characteristics of Hollow Core Photonic Crystal Fiber (HC-PCF) Interferometer fiber-optic gyroscope (IFOG) which contains the optical fundamental noise, the electronic circuit noise and the backscattering and back-reflection noise induced by HC-PCF is analyzed. A random walk coefficient model for closed-loop HC-PCF IFOG based on the noise power spectrum density is built. Taking into account the correlation modulation and demodulation method used in closed-loop gyro, for different noise sources, the noise power spectrum density at different frequencies are used in the model. Using the model, the main noise source in HC-PCF IFOG is determined. For a HC-PCF IFOG with RWC equals 6.3 × 10−3°/√h, the RWC induced by backscattering and back-reflection noise is 5.2 × 10−3°/√h, account for 67.8 % of the overall RWC. Moreover, a HC-PCF IFOG parameters optimal method is proposed based on the model, which can decrease the random walk coefficient by a factor of 17 %.