Abstract
Abstract Based on the primary electro-optic effect of lithium niobate crystal and combined with a polarizer and a Faraday rotator, a novel spatial non-reciprocal phase modulator design scheme suitable for Sagnac loop structure is proposed. On the one hand, this structure fundamentally eliminates the influence of eigenfrequency on the modulation mode of the system, and improves the sensitivity and accuracy of the system. On the other hand, experiments show that this phase modulator has good modulation characteristics and temperature stability. Applying this phase modulator to a fiber optic gyroscope (FOG), the experimental results are in good agreement with the theoretical analysis, which proves the correctness and feasibility of the structure. It provides new options for the use of phase modulators for test instrument such as fiber-optic gyroscopes and current transformers, and provides a way of thinking to promote the development of fiber-optic gyroscopes to high precision.
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