Abstract
We demonstrate that the reflection spectrum of a fiber
Fabry–Pérot formed by a single-mode fiber and an
external mirror does not exhibit the standard Lorentzian profile of a
conventional bulk-optic Fabry-Pérot, but is instead highly
asymmetric. Measurements indicate that the sign of this asymmetry is
different for dielectric and metal mirrors. We show that this asymmetry is
due to one of two mechanisms, namely the beam diffraction in the cavity and
the complex phase upon reflection from a metal layer. We present an
analytical approach to accurately model these spectra, and provide simple
analytical formulas, useful in the design and optimization of fiber
Fabry-Pérot-based sensors. Specifically, we present expressions
for the maximum finesse and the condition to obtain full contrast in a fiber
Fabry-Pérot. These results are widely applicable, in particular
to both low- and high-finesse interferometers.
© 2009 IEEE
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