Bandwidth-tunable band-rejection filter based on helicoidal fiber grating pair of opposite helicities.
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.
Shin
Woojin
W
Advanced Photonics Research Institute, Guangju Institute of Science and Technology, Guangju, Korea. swj6290@gist.ac.kr
Yu
Bong-Ahn
BA
Noh
Young-Chul
YC
Lee
Jongmin
J
Ko
Do-Kyeong
DK
Oh
Kyunghwan
K