Multi-function integrated optic chip for miniaturized resonant fiber optic gyroscope

Abstract

Due to the increasing demand for gyroscopes with reduced size, weight, cost, and power consumption (SWaP-C), integrated resonant fiber optic gyroscopes (RFOGs) have gained significant attention for their huge miniaturization potential. This paper presents a multi-function integrated optic chip (MFIOC) for RFOGs, which realizes the integration of beam splitter, polarizer, phase modulators (PMs) and intensity modulators (IMs). The MFIOC based on the annealed proton exchange lithium niobate platform offers powerful polarization filtering capability and low SWaP-C. The independent PM design effectively improves the bias instability and reduce the standard deviation of the gyro output by 23.41 dB. While optimizing the parameters of corresponding IMs reduces intensity feedback noise by 7 dB. This novel RFOG scheme with MFIOC paves the way for further research into high-precision, miniaturized, and integrated RFOGs.