All-fiber acousto-optic tunable notch filter with a fiber winding driven by a cuneal acoustic transducer
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Published on: May 11, 2014
Wending Zhang1, Feng Gao, Fang Bo
1MOE Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin 300457, China.
Abstract:
We report a type of all-fiber acousto-optic tunable notch filter consisting of a cuneal acoustic transducer and a fiber winding of four unjacketed single-mode fibers. With -32 dB peak rejection efficiency and 178 nm tunable range of the central wavelength, all of the tunable characteristics of the all-fiber acousto-optic tunable filter are kept. In addition, the structure is versatile and convenient for use in building other complicated filters. As an example, a coarse comblike filter has been built by adjusting the axial strains of the unjacketed fibers.
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