Title :
Bragg grating induced cladding mode coupling caused by ultra-violet light absorption
Author :
Bjarklev, A. ; Gruner-Nielsen, L. ; Soccolich, C.E.
fDate :
5/14/1998 12:00:00 AM
Abstract :
A numerical model based on coupled-mode theory and accurate representation of the refractive index is shown to reproduce the transmission characteristics of Bragg gratings in depressed cladding fibres. It is demonstrated that a ghost dip on the short wavelength side of the Bragg reflection is caused by asymmetry from transverse absorption of ultra-violet light during writing, and cannot be eliminated by assuring zero blaze angle
Keywords :
diffraction gratings; light absorption; optical communication equipment; optical fibre couplers; refractive index; wavelength division multiplexing; Bragg grating; WDM; asymmetry; blaze angle; coupled-mode theory; depressed cladding fibres; ghost dip; induced cladding mode coupling; numerical model; refractive index; short wavelength side; transmission characteristics; transverse absorption; ultra-violet light; ultra-violet light absorption;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19980715
