Abstract

A reflectively monitored Fabry–Perot temperature sensor is characterized over a 1250°C temperature range. Dielectric mirrors for the interferometer are incorporated into a continuous length of single-mode fiber by a fusion-splicing technique. The change in optical phase per unit temperature is nearly constant above room temperature but decreases at lower temperatures. Phase-shift data for the germania-doped silica fiber used in these experiments are compared with calculations based on previously reported information on the temperature dependence of refractive index and length in bulk fused silica.

© 1988 Optical Society of America

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