Journal
APPLIED OPTICS
Volume 50, Issue 6, Pages 924-929Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.50.000924
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Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Research Chair
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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. (C) 2011 Optical Society of America
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