Miniaturized Fiber Optic Gyroscope Transceiver Based on a SiN Photonic Chip

Abstract

In this work, we first present a miniaturized fiber optic gyroscope (FOG) transceiver based on an ultra-low loss silicon nitride (SiN) photonic chip operating at O-band. The photonic chip serves as a power splitter and polarizer, featuring high-efficiency edge couplers for hybrid integration with an external broadband light source and a high-performance photodetector (PD). The transceiver is co-assembled based on a standard butterfly package with a thermo-electric cooler (TEC). At a driving current of 100 mA, the transceiver produces an output power of 1.36 mW, which increases to 4.25 mW at 200 mA. Built with a fiber coil with ~380 m length and ~60 mm average diameter, the preliminary transceiver-based FOG exhibits the 10 s Allan deviation of $0.0969~^{\circ }$ /h and the angular random walk (ARW) of $0.0058~^{\circ }$ / $\sqrt {h}$ , which is comparable with their discrete counterparts. By integrating the high-power integration advantages of the SiN photonic platform with a reduction in fiber splices, this approach lays a solid foundation for developing more compact, high-precision, and high-power-required fiber-optic sensing systems.