A sensor consisting of two fiber-optic interferometers of slightly different sensitivities can offer both high sensitivity and a wide dynamic range when the phase difference between the two interferometer outputs is used to identify the order of the fringe from either interferometer output. This technique is demonstrated with a polarimetric temperature sensor utilizing two different lengths of stress-induced birefringent fibers as sensing elements.
© 1988 Optical Society of America
Original Manuscript: May 17, 1988
Manuscript Accepted: July 21, 1988
Published: October 1, 1988
Kin S. Chiang and Hidemi Tsuchida, "Dual-sensor technique for extending the dynamic range of a fiber-optic interferometric sensor," Opt. Lett. 13, 850-852 (1988)