Journal
OPTICS LETTERS
Volume 32, Issue 10, Pages 1214-1216Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.32.001214
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We have developed a new type of all-fiber band-rejection filter consisting of a helicoidal long-period fiber grating pair of opposite helicities, which provides highly flexible spectral control over the rejection bandwidth. The detailed fabrication method and operation principles of the proposed bandwidth-tunable band-rejection filter are described. The proposed device enables unique rejection bandwidth tuning over more than 14 nm at the rejection level of 15 dB, with low insertion loss and polarization-dependent loss achieved by adjusting torsion stress. (c) 2007 Optical Society of America.
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