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

Du-Ri Song | Zendy; Chang Su Jun | Zendy; Sun Do Lim | Zendy; Byoung Yoon Kim | Zendy

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

Author(s) -

Du-Ri Song,

Chang Su Jun,

Sun Do Lim,

Byoung Yoon Kim

Publication year - 2014

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.030873

Subject(s) - materials science , optics , birefringence , wavelength , optical fiber , optical filter , polarization maintaining optical fiber , optoelectronics , dispersion shifted fiber , fiber optic sensor , physics

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 >35 nm by changing the applied frequency, and the coupling efficiency is higher than 92% with <5 nm 3-dB bandwidth.

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