Abstract

We propose and experimentally demonstrate a novel switchable and discretely tunable comb filter based on a thermally induced linearly chirped fiber Bragg grating. Experimentally we achieved a thermally induced optical bandpass filter that has eight switchable passband peaks with peak separations of 1.6 and 3.2nm, a very narrow bandwidth (as small as 10pm) of each peak, a tunable range of 16.5nm, and a greater than 25dB rejection ratio. Two spectral peaks separated by only 0.8nm were also obtained with this comb filter. This filter provides the unique advantages of an all-fiber structure, switchable spectral peaks, independent tuning of the center wavelength and wavelength spacing of the spectral peaks, low polarization sensitivity, simple structure, ease of fabrication, and low cost.

© 2005 Optical Society of America

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