介紹了光纖陀螺的工作原理，依據與慣性空間作相對轉動導致的Sagnac效應，對光纖陀螺的關鍵器件即集成光學調制器進行了分析；運用導出的基本公式，對研制光纖陀螺普遍采用的鈮酸鋰Y分支集成電光波導調制器的驅動電壓和調制帶寬參數進行了計算，計算結果為該調制器的設計提供了可靠數據。
關 鍵 詞 光纖陀螺; Y分支調制器; 集成光學; 鈮酸鋰

Abstract A fiber-optic gyro is a kind of optical fiber sensor for the angular velocity. In this paper, the fundamental principle of fiber-optic gyro based on Sagnac effect is reviewed, and the integrated optical phase modulator, which is a key device of the gyro and is our main task in the work, are analysed. According to the yielded equations, the drive voltage and frequency bandwidth in modulation of fiber-optic gyro are calculated, and the calculation results can be contributed to a design of the modulator used in fiber-optic gyro.
Key words fiber-optic gyro; Y-branch modulator; integrated optics; lithium niobate