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Torsional mode acousto-optic tunable filter (AOTF) is demonstrated using a metal-coated birefringent optical fiber for an improved robustness. The changes in acoustic and optical properties of a metal-coated birefringent optical fiber induced by the thin metal coating were analyzed experimentally and theoretically. The filter wavelength shift is successfully explained as a result of combined effect of acoustic wavelength change and optical birefringence change. We also demonstrated a small form-factor configuration by coiling the fiber with 6 cm diameter without performance degradation. The center wavelength of the filter can be tuned &gt;35 nm by changing the applied frequency, and the coupling efficiency is higher than 92% with &lt;5 nm 3-dB bandwidth.

Effect of metal coating in all-fiber acousto-optic tunable filter using torsional wave