title: Wavelength-spacing-tunable multichannel filter incorporating a sampled chirped fiber Bragg grating based on a symmetrical chirp-tuning technique without center wavelength shift.
abstract: We propose and experimentally demonstrate a simple and flexible scheme for a wavelength-spacing-tunable multichannel filter exploiting a sampled chirped fiber Bragg grating based on a symmetrical modification of the chirp ratio. Symmetrical bending along a sampled chirped fiber Bragg grating attached to a flexible cantilever beam induces a variation of the chirp ratio and a reflection chirp bandwidth of the grating without a center wavelength shift. Accordingly, the wavelength spacing of a sampled chirped fiber Bragg grating is continuously controlled by the reflection chirp bandwidth variation of the grating corresponding to the bending direction, which allows for realization of an effective wavelength-spacing-tunable multichannel filter. Based on the proposed technique, we achieve the continuous tunability of the wavelength spacing in a range from 1.51 to 6.11 nm, depending on the bending direction of the cantilever beam.
authors.affiliation: Photonics Research Center, Korea Institute of Science and Technology, Seongbook-Gu, Seoul, South Korea. yyghan@kist.re.kr
authors.forename: Young-Geun
authors.initials: YG
authors.lastname: Han
authors.forename: Xinyong
authors.initials: X
authors.lastname: Dong
authors.forename: Ju Han
authors.initials: JH
authors.lastname: Lee
authors.forename: Sang Bae
authors.initials: SB
authors.lastname: Lee