Common-Mode Noise Reduction In Interferometric Fiberoptic Sensors Using Electrooptic Feedback

A. B. Buckman; K. Park

doi:10.1117/12.963018

13 February 1990 Common-Mode Noise Reduction In Interferometric Fiberoptic Sensors Using Electrooptic Feedback

A. B. Buckman, K. Park

Proceedings Volume 1169, Fiber Optic and Laser Sensors VII; (1990) https://doi.org/10.1117/12.963018
Event: OE/FIBERS '89, 1989, Boston, United States

Abstract

Common-mode perturbations are an important subset of the environmental variations which affect the accuracy and stability of interferometric fiberoptic sensors. These effects, among which are source wavelength drift and spatially uniform temperature and pressure variations, alter the phase shifts in each of the optical paths in the fiber circuit in proportion to the optical path length. Earlier work showed that a recirculating delay line fiberoptic sensor could be modified to compensate for common-mode perturbations, but at the cost of some loss in measurand sensitivity. In this paper, we employ transmittance-dependent electrooptic feedback in an enhanced Mach-Zehnder fiberoptic interferometer to compensate for common-mode perturbations, while enhancing by aproximately an order of magnitude the measurand sensitivity found in the conventional Mach-Zehnder fiber interferometer.

Citation Download Citation

A. B. Buckman and K. Park "Common-Mode Noise Reduction In Interferometric Fiberoptic Sensors Using Electrooptic Feedback", Proc. SPIE 1169, Fiber Optic and Laser Sensors VII, (13 February 1990); https://doi.org/10.1117/12.963018

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