This paper applies non-reciprocal phase error analysis approach to the fiber optic gyroscope coil made of multi-core fiber and fan-in/fan-out devices to estimate the thermal sensitivity analytically for the first time. In the case of MCF symmetric coils, the relationship between the coil parameters, which can take advantage of MC-FOG in terms of sensitivity to temperature change, is quantitatively clarified in comparison with SMF symmetric coils. In addition, the non-reciprocal phase error of the FIFO element under temperature disturbance is quantitatively clarified. The design policy of the coils proposed from these results is also discussed. And method for connecting cores that minimizes the phase error is proposed. As analytical results, besides lowering the manufacturing cost of the coil due to the shorter fiber length, the multi-core fiber coil was found to further reduce the phase error sensitivity compared to a single-mode coil of equivalent length.

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Shinji Mitani, Tadahito Mizutani, Yusaku Tottori, Haruyuki Endo, and Yuichi Takushima, "Analysis of temperature-induced drift rate error in interferometric multi-core fiber optic gyroscope," Proc. SPIE 11852, International Conference on Space Optics — ICSO 2020, 118523E (Presented at International Conference on Space Optics — ICSO 2021: 11 June 2021; Published: 11 June 2021); https://doi.org/10.1117/12.2599545.