Combined frequency-locking technology of a digital integrated resonator optic gyroscope with a phase-modulated feedback loop

Zhu Jiangbo; Liu Wenyao; Pan Ziwen; Tao Yu; Yin Shihao; Tang Jun; Liu Jun

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Combined frequency-locking technology of a digital integrated resonator optic gyroscope with a phase-modulated feedback loop

机译：具有相位调制反馈回路的数字集成谐振器光学陀螺仪的组合频锁技术

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In the resonator fiber optic gyroscope (RFOG), the conventional laser feedback loop is realized by adjusting the laser central frequency to tracking the resonance point of the resonator. This method generally relies on the laser tuning coefficient and digital-to-analog converter, which inevitably produces quantization error and limits frequency-locking accuracy and gyro resolution. In addition, the output drift caused by low-frequency noise also is a problem with long-term lock-in tests. In this paper, a novel and simple combined frequency-locking technology based on a phase-modulated feedback loop and a laser feedback loop is proposed by using the high-precision tuning of a phase modulator to improve the resolution and suppress the low-frequency drift. Furthermore, it has been proved by experiments that the resolution is increased by 10 times, while the frequency-locking accuracy is improved from 10 degrees/s to 0.5 degrees/s by using the combined frequency-locking mode. In addition, the low-frequency drift is eliminated with the long-term lock-in of RFOG, and the system resolution from 1 degrees/s to 0.1 degrees/s is accurately displayed. (C) 2019 Optical Society of America

机译：在谐振器光纤陀螺仪（RFOG）中，通过调节激光中心频率来跟踪谐振器的谐振点来实现传统的激光反馈回路。该方法通常依赖于激光调谐系数和数字到模拟转换器，这不可避免地产生量化误差并限制频率锁定精度和陀螺分辨率。此外，由低频噪声引起的输出漂移也是长期锁定测试的问题。本文通过使用相位调制器的高精度调谐来提高基于相位调制反馈回路和激光反馈回路的新颖和简单的组合频锁技术，以提高分辨率并抑制低频漂移。此外，通过实验证明，通过使用组合的频率锁定模式，分辨率增加了10次，而频率锁定精度从10度/秒提高到0.5度/秒。此外，通过RFOG的长期锁定消除了低频漂移，并且精确地显示了从1度到0.1度/ s的系统分辨率。（c）2019年光学学会

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来源
《Applied optics》 |2019年第36期|共7页
作者
Zhu Jiangbo; Liu Wenyao; Pan Ziwen; Tao Yu; Yin Shihao; Tang Jun; Liu Jun;
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作者单位

North Univ China Minist Educ Key Lab Instrumentat Sci &

Dynam Measurement Taiyuan Shanxi Peoples R China;

North Univ China Minist Educ Key Lab Instrumentat Sci &

Dynam Measurement Taiyuan Shanxi Peoples R China;

North Univ China Minist Educ Key Lab Instrumentat Sci &

Dynam Measurement Taiyuan Shanxi Peoples R China;

North Univ China Minist Educ Key Lab Instrumentat Sci &

Dynam Measurement Taiyuan Shanxi Peoples R China;

North Univ China Minist Educ Key Lab Instrumentat Sci &

Dynam Measurement Taiyuan Shanxi Peoples R China;

North Univ China Minist Educ Key Lab Instrumentat Sci &

Dynam Measurement Taiyuan Shanxi Peoples R China;

North Univ China Minist Educ Key Lab Instrumentat Sci &

Dynam Measurement Taiyuan Shanxi Peoples R China;

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Combined frequency-locking technology of a digital integrated resonator optic gyroscope with a phase-modulated feedback loop

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