Title :
Application of the Complex Coupled-Mode Theory to Optical Fiber Grating Structures
Author :
Song, Ning ; Mu, Jianwei ; Huang, Wei-Ping
Author_Institution :
State Key Lab. on Fiber-Opt. Local Area Networks & Adv. Opt. Commun. Syst., Shanghai Jiao Tong Univ., Shanghai, China
fDate :
3/1/2010 12:00:00 AM
Abstract :
The complex coupled-mode theory (CMT) is applied to optical fiber grating structures of circular cross section. The radiative fields are treated in terms of discrete complex modes similarly to the guided modes in the conventional CMT. The number of modes that contribute to the couplings may be effectively reduced by considering the phase-matching condition. Therefore, simple analytical expressions for mode amplitudes and powers are obtained. Examples of the Bragg gratings with various outer cladding refractive indexes, e.g., lower, equal to and higher than the inner cladding refractive index, are investigated and show excellent agreement with rigorous numerical solutions.
Keywords :
Bragg gratings; optical fibre cladding; optical fibre couplers; optical fibre theory; optical phase matching; refractive index; Bragg gratings; cladding refractive indexes; complex coupled-mode theory; discrete complex modes; optical couplings; optical fiber grating structures; phase-matching; radiative fields; Coupled-mode theory (CMT); fiber gratings; mode coupling; optical fiber device; perfectly matched layer (PML); radiation mode.;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2010.2041428
