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Linear phase detection for a bimodal fiber sensor

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Abstract

Interference between the LP01 and LP02 modes is used to measure fiber elongation. We present a passive phase-detection technique that uses a mask in the far field of the output beam and spatial filters in the image of the fiber end face, giving a linear response. Experimental results show a precision of about 3% of one period, which corresponds to a 4-μm elongation.

© 1988 Optical Society of America

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