Title :
Intermodal coupling by periodic microbending in dual-core fibers-comparison of experiment and theory
Author :
Dong, L. ; Birks, T.A. ; Ober, M.H. ; Russell, P. St J
Author_Institution :
Optoelectron. Res. Centre, Southampton Univ., UK
fDate :
1/1/1994 12:00:00 AM
Abstract :
Grating coupling (caused by periodic microbending) between the quasi-even and quasi-odd normal modes of dual-core fibers is treated, and an accurate design formula is derived for the coupling coefficient. An analytical form for the intrinsic coupling coefficient of two dissimilar cores is also given. Good agreement is found between theory and experimental data on fibers perturbed either by acoustic flexural waves or fixed mechanical gratings. The paper provides useful design rules for dual-core fiber devices
Keywords :
acousto-optical devices; bending; diffraction gratings; optical couplers; optical fibre theory; optical fibres; accurate design formula; acoustic flexural waves; analytical form; coupling coefficient; dissimilar cores; dual-core fibers; fixed mechanical gratings; grating coupling; intermodal coupling; periodic microbending; quasi-even normal modes; quasi-odd normal modes; Acoustic applications; Acoustic devices; Acoustic waves; Fiber gratings; Filters; Frequency; Optical fiber devices; Optical fiber polarization; Optical fiber theory; Switches;
Journal_Title :
Lightwave Technology, Journal of
