Abstract

We report on the fabrication of a monolithic fiber Fabry–Perot interferometer whose cavity is a microscopic air bubble. The latter is formed when splicing together a conventional single-mode fiber and an index-guiding photonic crystal fiber with the standard arc-discharge technique. Spherical microcavities with diameters ranging from 20to58μm were fabricated with such a technique. The interferometers exhibited low thermal sensitivity (less than 1.0pm°C), high mechanical strength, broad operation wavelength range, and fringe contrast in the 812dB range. The applications of the interferometers for strain sensing (up to 5000μϵ) is demonstrated.

© 2009 Optical Society of America

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