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 peak rejection efficiency and 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.
© 2011 Optical Society of America
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