Abstract

A fiber sensor system based on high-birefringence optical fiber and a frequency-stabilized He–Ne Zeeman laser (λ = 0.6328 μm) has been demonstrated. The small path-length changes of interest are extracted from the amplitude or phase of the laser beat frequency by using either the phase-sensitive detection or the phase-demodulation technique. A minimum detectable optical phase delay of 1.5 × 10⁻⁶ rad/Hz^1/2 or 17 × 10⁻⁶ rad/Hz^1/2 has been achieved.

© 1992 Optical Society of America

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