Open AccessBand-rejection fiber filter and fiber sensor based on a Bragg fiber of transversal resonant structure
Author(s) -
Daru Chen,
Tzong–Jer Yang,
Jin-Jei Wu,
Linfang Shen,
Kun-Lin Liao,
Sailing He
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.016489
Subject(s) - fiber bragg grating , materials science , optics , graded index fiber , fiber optic sensor , long period fiber grating , polarization maintaining optical fiber , cladding (metalworking) , plastic optical fiber , dispersion shifted fiber , photonic crystal fiber , all silica fiber , mode volume , transversal (combinatorics) , phosfos , cladding mode , refractive index , optical fiber , optoelectronics , wavelength , physics , composite material , mathematical analysis , mathematics
We propose a novel band-rejection fiber filter based on a Bragg fiber of transversal resonant structure, which can also be used as a fiber sensor. Defect layers are introduced in the periodic high/low index structure in the cladding of the Bragg fiber. Coupling between the core mode and the defect mode results in large confinement loss for some resonant wavelengths inside the band gap of the Bragg fiber. A segment of the Bragg fiber of transversal resonant structure can be used as a band-rejection fiber filter, whose characteristics are mainly determined by the defect layer. The loss peak wavelength of the Bragg fiber is dependent on the refractive index and the thickness of the defect layer which indicates its applications of refractive index and strain sensing.