Abstract

We experimentally demonstrate a novel cosine apodization technique for dual-resonance all-fiber acoustic-optic tunable filter. The technique is based on a hybrid control of input acoustic polarization state and circumferential fiber twist. We will show that intrinsic sidelobe spectra occurring between dual filtering bands are successfully suppressed through our approach, which will be also theoretically confirmed via our analytical and numerical studies. The results illustrate that the spectral positions of each resonance are tuned linearly and continuously by the fiber twist, and that overall sidelobe spectra between two resonances are suppressed regardless of fiber twist angle. The proposed scheme is useful to minimize cross talk between adjacent wavelength channels in optical sensor systems. We highlight that our approach is directly applicable to low-noise matched filtering.

© 2015 Optical Society of America

Spectral shaping of an all-fiber torsional acousto-optic tunable filter

Jeakwon Ko, Kwang Jo Lee, and Byoung Yoon Kim
Appl. Opt. 53(36) 8499-8506 (2014)

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

Kwang Jo Lee, In-Kag Hwang, Hyun Chul Park, and Byoung Yoon Kim
Opt. Express 18(12) 12059-12064 (2010)

Analyses of unintentional intensity modulation in all-fiber acousto-optic tunable filters

Kwang Jo Lee, In-Kag Hwang, Hyun Chul Park, Ki Hak Nam, and Byoung Yoon Kim
Opt. Express 18(5) 3985-3992 (2010)

Axial strain dependence of all-fiber acousto-optic tunable filters

Kwang Jo Lee, In-Kag Hwang, Hyun Chul Park, and Byoung Yoon Kim
Opt. Express 17(4) 2348-2357 (2009)

Low-loss all-fiber acousto-optic tunable filter

D. O. Culverhouse, S. H. Yun, D. J. Richardson, T. A. Birks, S. G. Farwell, and P. St. J. Russell
Opt. Lett. 22(2) 96-98 (1997)