Zhang Hongying, Dong Yongkang, Leeson Jesse, Chen Liang, Bao Xiaoyi
Fiber Optics Group, Department of Physics, University of Ottawa, Ottawa, K1N 6N5, Canada.
Appl Opt. 2011 Feb 20;50(6):924-9. doi: 10.1364/AO.50.000924.
A novel high sensitivity optical fiber current sensor (OFCS) based on polarization diversity and a Faraday rotation mirror cavity is proposed and demonstrated. Comparing with single-channel detection in a conventional OFCS, a signal power gain of 6 dB and a signal-to-noise ratio improvement of over 30 dB have been achieved in the new scheme. The cavity amplifies magnetic field-induced nonreciprocal phase modulation, while the Faraday rotation mirrors suppress the reciprocal birefringence. A linear response is obtained for current amplitude as low as several mA at an AC frequency of 1 kHz.
提出并演示了一种基于偏振分集和法拉第旋转镜腔的新型高灵敏度光纤电流传感器（OFCS）。与传统OFCS中的单通道检测相比，新方案实现了6 dB的信号功率增益和超过30 dB的信噪比改善。该腔放大磁场引起的非互易相位调制，而法拉第旋转镜抑制互易双折射。在1 kHz的交流频率下，对于低至几毫安的电流幅度获得了线性响应。
