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Ultra-broad-band AOTF based on cladding etched single-mode fiber

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5 Author(s)
Tao Jin ; Dept. of Electron. Eng., Tsinghua Univ., Beijing, China ; Qun Li ; Jianhui Zhao ; Kai Cheng
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The etching effect on the bandwidth of acoustooptic coupling between core and cladding modes in a single-mode (SM) fiber was investigated experimentally and theoretically. It was found that when the fiber diameter is etched down to a critical value, extremely broadband acoustooptic tunable filter (AOTF) could be achieved. We demonstrated an ultra-broadband acoustooptic filter with -3-dB bandwidth of 362 nm and dynamic range of >14 dB, which is the broadest bandwidth of AOTF on SMF up to now. The results point to potential realization of a new class of high efficient, fast, all-fiber variable optical attenuator.

Published in:

Photonics Technology Letters, IEEE  (Volume:14 ,  Issue: 8 )