Resolution improvement for digital closed loop resonator micro-optic gyro based on tunable resonator

Chengfei Zhang; Wenyao Liu; Yongqiu Zheng; Panlong An; Jun Tang; Jun Liu

doi:10.1117/1.OE.57.9.097102

24 September 2018 Resolution improvement for digital closed loop resonator micro-optic gyro based on tunable resonator

Chengfei Zhang, Wenyao Liu, Yongqiu Zheng, Panlong An, Jun Tang, Jun Liu

Author Affiliations +

Optical Engineering, Vol. 57, Issue 9, 097102 (September 2018). https://doi.org/10.1117/1.OE.57.9.097102

Abstract

In the resonator micro-optic gyro (RMOG) frequency locking loop, digital-to-analog converter quantization error leads to low-accuracy laser tuning, causing frequency locking and rotation sensing dead zones. This paper proposes a planar waveguide resonator (PWR) frequency locking scheme with a piezoelectric (PZT) ring to tune the PWR resonant frequency to track and lock to the laser frequency. The proposed scheme achieved PZT-PWR Q = 4 × 10⁷ and frequency tuning coefficient = 1.124 MHz / V. Direct comparison on an RMOG device experimentally verified the proposed scheme reduced frequency locking noise to 0.25 deg / s and improved gyro resolution from 1 to <0.05 deg / s.

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Chengfei Zhang, Wenyao Liu, Yongqiu Zheng, Panlong An, Jun Tang, and Jun Liu "Resolution improvement for digital closed loop resonator micro-optic gyro based on tunable resonator," Optical Engineering 57(9), 097102 (24 September 2018). https://doi.org/10.1117/1.OE.57.9.097102

Received: 28 May 2018; Accepted: 5 September 2018; Published: 24 September 2018

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