Design and fabrication of the GaAs integrated optical chip for fiber optical gyroscope

Abstract

An integrated optical chip for fiber optical gyroscope (FOG) is designed and fabricated on GaAs. To achieve a high modulation efficiency and a small chip size, a deeply etched waveguide structure is employed, and accordingly a multimode interference (MMI) coupler is used as the 1 2 power splitter. The size of the chip is about 8.5 mm 0.5 mm, which is much smaller than that of LiNbO 3 -based chips. The experimental results show that the extinction ratio (ER) of the TE mode to the TM mode is over 26 dB and the value of V L of the phase modulators is 18 V cm. The method to further lower V is discussed.

Research progress of integrated optical gyroscope

“…In addition to the above three common material platforms, there are proposals for IIOGs based on GaAs [19] and InP [20] platforms. Research on these platforms is limited.…”

“…)] achieved a detection limit of19 deg =h • Hz p in an area smaller than 10 cm 2 . Additionally, a commercial-grade IIOG was demonstrated based on a 3-m-long large-area SiN sensing coil, with an ARW and bias drift of 8.52 deg = h p and 58.7 deg =h, respectively.…”

The Research of Fiber Optic Gyroscope Error Based on Insertion Loss and Beam-Splitting Ratio of Y-Waveguide

“…As the core of digital closed-loop fiber optic gyroscopes, integrated lithium niobate optical devices (commonly known as y-waveguide) is the important way to develop of high precision fiber optic gyroscope. Y-integrated optical waveguide Phase modulator is a core component of the interferometric fiber optic gyroscope, which set couplers, polarizer, Phase modulator as a whole, its have a big impact on precision and stability of gyro [1,2,3]. It is important to learn about y-waveguide indicators and study on measurement method of main parameters.…”