Jin Xiaofeng, Zhu Yanhong, Guo Jiaojiao, Jin Xiangdong, Yu Xianbin, Zheng Shilie, Chi Hao, Zhang Xianmin
Opt Lett. 2017 Oct 15;42(20):4052-4054. doi: 10.1364/OL.42.004052.
A highly sensitive demodulation approach of a vibration-induced phase shift based on a low-noise optoelectronic oscillator (OEO) is proposed and experimentally demonstrated. The vibration-induced optical phase variation is directly converted to the electrical oscillating signal of the OEO with carrier phase-shifted double-sideband (CPS-DSB) modulation, which is realized by cascading a dual-output Mach-Zehnder modulator (DOMZM) and a fiber interferometer. Theoretically, within a CPS-DSB modulated OEO, the minimum detectable optical phase shift is determined by the phase noise achievable, and the sensitivity of the optical phase shift demodulation no longer depends on its frequency. A proof-of-concept OEO oscillating at 100 MHz with ultralow phase noise is built for demonstration. The achieved minimum detectable optical phase shift is 0.58 μrad/√Hz at 1 kHz and 0.21 μrad/√Hz at 10 kHz, which are the best results ever reported, to the best of our knowledge.
提出并通过实验证明了一种基于低噪声光电振荡器（OEO）的振动诱导相移的高灵敏度解调方法。通过载波相移双边带（CPS-DSB）调制，将振动诱导的光学相位变化直接转换为OEO的电振荡信号，这是通过级联双输出马赫-曾德尔调制器（DOMZM）和光纤干涉仪来实现的。理论上，在CPS-DSB调制的OEO中，最小可检测光学相移由可实现的相位噪声决定，并且光学相移解调的灵敏度不再取决于其频率。构建了一个工作在100 MHz且具有超低相位噪声的概念验证OEO进行演示。据我们所知，在1 kHz时实现的最小可检测光学相移为0.58 μrad/√Hz，在10 kHz时为0.21 μrad/√Hz，这是迄今报道的最佳结果。
