We demonstrate a novel all-fiber acousto-optic tunable notch filter based on coupling to cladding modes in a single-mode fiber. The device has the advantage of low loss (<0.1 dB) and low polarization dependence. By coupling input light to multiple cladding modes by use of multiple acoustic waves, we achieved an electronically controllable variable spectral profile without a significant coherent cross-talk problem.
© 1997 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2340) Fiber optics and optical communications : Fiber optics components
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.1040) Optical devices : Acousto-optical devices
Hyo Sang Kim, Seok Hyun Yun, In Kag Kwang, and Byoung Yoon Kim, "All-fiber acousto-optic tunable notch filter with electronically controllable spectral profile," Opt. Lett. 22, 1476-1478 (1997)