バイポーラデジタルセロダイン方式の高精密な制御による共振方式光ファイバジャイロの性能向上(光ファイバケーブル・コード,通信用光ファイバ,光ファイバ線路構成部品,光線路保守監視・試験技術,接続・配線技術,光ファイバ測定技術,光コネクタ,ホーリーファイバ,機能性光ファイバ,光信号処理,光ファイバ型デバイス,光測定器,レーザ加工,ハイパワーレーザ光輸送,光給電,一般)

概要

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Performance improvement of the resonator fiber optic gyro (R-FOG) is demonstrated by precisely controlling the bipolar digital serrodyne scheme. Suppression of the backscattering induced performance degradation is experimentally demonstrated. Previously, a method to automatically control the amplitude of the bipolar digital serrodyne phase modulation, and thus to suppress the backscattering induced degradation, was developed using the digital gain control function of the function generator with a field programmable gated array (FPGA) based digital signal processor. However, the suppression level was not satisfying. To improve the performance, a scheme employing a gain variable amplifier and the oversampling technique is newly incorporated into the R-FOG. Additionally, a lock-in detection scheme with 90° out-of-phase reference signal is proposed to generate an error signal for the control. With the proposed controlling methods for the bipolar digital scheme, improved bias stability is successfully demonstrated in the experiment.
2011-08-18