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 $20\text{to}58\mu \mathrm{m}$ were fabricated with such a technique. The interferometers exhibited low thermal sensitivity (less than $1.0\mathrm{pm}∕°\mathrm{C}$), high mechanical strength, broad operation wavelength range, and fringe contrast in the $8–12\mathrm{dB}$ range. The applications of the interferometers for strain sensing (up to $5000\mu ϵ$) is demonstrated.

© 2009 Optical Society of America

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