Abstract
A proposal is made of a novel fiber-optic interferometric sensor using a pair of sensing and reference birefringent single-mode fibers contacted in the length direction. A laser beam with orthogonal linearly polarized two-frequency component waves is launched into each fiber in accordance with its birefringent axes. The two-frequency component waves are alternatively guided in the birefringent axes of both fibers. This alternative arrangement results in high-sensitive performance of a strain sensor. The contacting arrangement of the two fibers eliminates the output fluctuations resulting from environmental temperature disturbances.
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