Title :
Analysis of two parallel long-period fiber gratings
Author :
Chiang, Kin Seng ; Chan, Florence Yuen Ming ; Ng, Mei Nar
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, China
fDate :
5/1/2004 12:00:00 AM
Abstract :
A wavelength-selective coupler constructed with two parallel identical uniform long-period fiber gratings (LPFGs) is analyzed by the coupled-mode theory. The effects of introducing a longitudinal offset distance between the two gratings on the transmission characteristics of the coupler are discussed and the conditions for achieving a 100% coupling efficiency are highlighted. It is found that 100% coupling can be achieved with a practical grating length by using a proper grating design and a suitable index-matching surrounding medium. The theoretical results agree well with the experimental data.
Keywords :
coupled mode analysis; diffraction gratings; optical design techniques; optical fibre couplers; 100 percent; 100% coupling efficiency; coupled-mode theory; grating design; grating length; index matching; longitudinal offset distance; parallel long-period fiber gratings; transmission characteristics; wavelength-selective coupler; Bragg gratings; Fiber gratings; Optical coupling; Optical fiber couplers; Optical fiber theory; Optical filters; Refractive index; Resonance; Strain measurement; Temperature sensors; Coupled-mode theory; LPFGs; fiber gratings; long-period fiber gratings; optical couplers; optical filters;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.825357
