Title :
Theoretical analysis of cladding-mode waveguide dispersion and its effects on the spectra of long-period fiber grating
Author :
Jeong, H. ; Oh, K.
Author_Institution :
Kwangju Inst. of Sci. & Technol., Gwangju, South Korea
Abstract :
A new method to control the free spectral range (FSR) of a long-period fiber grating (LPFG) is proposed and theoretically analyzed. As the refractive index decreases radially outward in the silica cladding by graded doping of fluorine, waveguide dispersion in the cladding modes was modified to result in the effective indexes change and subsequently the phase-matching conditions for coupling with the core mode in a LPFG. Enlargement of the FSR in a LPFG was theoretically confirmed.
Keywords :
diffraction gratings; finite difference methods; optical fibre cladding; optical fibre communication; optical fibre dispersion; optical fibre theory; optical phase matching; refractive index; spectral analysis; cladding modes; cladding-mode waveguide dispersion; core mode; effective indexes; free spectral range; graded fluorine doping; long-period fiber grating; long-period fiber grating spectra; optical fibre communication; phase-matching conditions; refractive index; silica cladding; waveguide dispersion; Fiber gratings; Filters; Optical fiber communication; Optical fiber devices; Optical fiber dispersion; Optical fiber polarization; Optical fibers; Optical waveguides; Resonance; Waveguide theory;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2003.815641
