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Bandwidth-tunable band-rejection filter based on helicoidal fiber grating pair of opposite helicities

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Abstract

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 14nm at the rejection level of 15dB, with low insertion loss and polarization-dependent loss achieved by adjusting torsion stress.

© 2007 Optical Society of America

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