title: Bandwidth-tunable band-rejection filter based on helicoidal fiber grating pair of opposite helicities.
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 14 nm at the rejection level of 15 dB, with low insertion loss and polarization-dependent loss achieved by adjusting torsion stress.
authors: Advanced Photonics Research Institute, Guangju Institute of Science and Technology, Guangju, Korea. swj6290@gist.ac.kr
authors: Woojin
authors: W
authors: Shin
authors: Bong-Ahn
authors: BA
authors: Yu
authors: Young-Chul
authors: YC
authors: Noh
authors: Jongmin
authors: J
authors: Lee
authors: Do-Kyeong
authors: DK
authors: Ko
authors: Kyunghwan
authors: K
authors: Oh