Research on Integrated Fiber Optic Gyroscope Phase Modulator
In order to meet the R&D needs of low-cost integrated fiber gyroscope,a PZT fiber phase modulator with small nonlinearity coefficient and stable performance is developed.A new structural design scheme of PZT fiber phase mod-ulator with support bracket is proposed,and the structural parameter design and frequency characteristics analysis of the modulator are completed,and the performance optimization of PZT fiber phase modulator is realized.At the same time,in order to solve the problem of large nonlinear error of PZT fiber phase modulator,a phase hysteresis nonlinear feedback com-pensation scheme based on double closed-loop system is proposed,and the design of SOPC-based demodulation scheme is completed to compensate for the inherent hysteresis nonlinearity error of piezoelectric materials,so as to reduce the bias of the gyroscope and improve the bias stability.An integrated fiber optic gyroscope system based on integrated photonic chips is built,and the experimental results show that the zero drift of the gyroscope is 0.69(°)/h for 10 s,and the technology ef-fectively compensates for the influence of hysteresis nonlinearity error on the accuracy of the gyroscope.
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