Abstract

A new type of long-period fiber grating structure that contains dissimilar fiber types is proposed. This dissimilar-fiber long-period fiber grating (DF-LPFG) structure is fabricated by splicing together subperiod sections of dissimilar fiber types. Due to the large index differences that can exist between various fiber types, the resulting DF-LPFGs can be exceptionally short, e.g., a few millimeters. As a demonstration, prototype DF-LPFGs were fabricated by periodically splicing together standard single-mode fiber and dispersion-compensating fiber using a commercially available cleaver and splicer. The resulting DF-LPFGs exhibited clear resonances with attenuations of 35  dB and insertion losses of 8  dB. To the best of the authors’ knowledge, this is the first demonstration of the DF-LPFG concept. Other devices based on this concept may also be realizable.

© 2017 Optical Society of America

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