Abstract

The dynamic temperature phase sensitivity of a three-layer optical fiber is calculated for unjacketed as well as Al- and Hytrel-coated fibers. The calculations include both the variation of the refractive index with temperature and the thermally induced axial and radial strains. The calculated phase sensitivity indicates that it is currently possible to measure a 1-μ°C temperature change at frequencies exceeding 50 kHz with 1 cm of a metal coated optical fiber.

© 1983 Optical Society of America

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