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

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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 >35 nm by changing the applied frequency, and the coupling efficiency is higher than 92% with <5 nm 3-dB bandwidth.
Publisher
OPTICAL SOC AMER
Issue Date
2014-12
Language
English
Article Type
Article
Keywords

SILICA OPTICAL FIBERS; MODE; BIREFRINGENCE; MODULATION; STRENGTH

Citation

OPTICS EXPRESS, v.22, no.25, pp.30873 - 30881

ISSN
1094-4087
DOI
10.1364/OE.22.030873
URI
http://hdl.handle.net/10203/198590
Appears in Collection
PH-Journal Papers(저널논문)
Files in This Item
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