Silicon-Based Multi-Channel Integrated Detection Chip for a Three-Axis Interferometric Fiber Optic Gyro

This study presents a three-axis interferometric fiber optic gyro (TA-IFOG) that utilizes a silicon-based multi-channel integrated detector chip(MC-IDC) to enhance the system's performance and compactness. Advanced optical integration techniques enable the incorporation of couplers, polarization beam splitters, and photodetectors onto a single chip, thereby further streamlining the design. The test results indicate that the MC-IDC performs excellently. The power distribution across each channel is uniform, with an extinction ratio of 20 dB and a loss of approximately 18 dB. The chip's photoelectric conversion efficiency surpasses 0.9 A/W, and it maintains a dark current below 3.4 nA. Furthermore, testing of the TA-IFOG system confirms that its accuracy is better than 0.18°/h under normal temperature conditions. In comparison with traditional three-axis fiber optic gyros, the TA-IFOG system offers a simplified design that significantly reduces both cost and size, thereby increasing its potential for broader market adoption.