Sidelobe suppression in all-fiber acousto-optic tunable filter using torsional acoustic wave

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We propose two techniques to suppress intrinsic sidelobe spectra in all-fiber acousto-optic tunable filter using torsional acoustic wave. The techniques are based on either double-pass filter configuration or axial tailoring of mode coupling strength along an acousto-optic interaction region in a highly birefringent optical fiber. The sidelobe peak in the filter spectrum is experimentally suppressed from -8.3dB to -16.4dB by employing double-pass configuration. Axial modulation of acousto-optic coupling strength is proposed using axial variation of the fiber diameter, and the simulation results show that the maximum side peak of -9.3dB can be reduced to -22.2dB. We also discuss the possibility of further spectral shaping of the filter based on the axial tailoring of acousto-optic coupling strength. (C)2010 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2010-06
Language
English
Article Type
Article
Keywords

BANDPASS FILTER; OPTICAL-FIBERS

Citation

OPTICS EXPRESS, v.18, no.12, pp.12059 - 12064

ISSN
1094-4087
DOI
10.1364/OE.18.012059
URI
http://hdl.handle.net/10203/19819
Appears in Collection
PH-Journal Papers(저널논문)
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