DocumentCode :
905098
Title :
Contra-directional coupling in grating-assisted guided-wave devices
Author :
Hong, Jin ; Huang, Weiping
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Volume :
10
Issue :
7
fYear :
1992
fDate :
7/1/1992 12:00:00 AM
Firstpage :
873
Lastpage :
881
Abstract :
Contradirectional power coupling in grating-assisted guided-wave devices is studied by applying a vector nonorthogonal coupled-mode formulation. The coupled-mode equations are solved by a transfer matrix method. All the space-harmonics generated by the periodic grating are considered. The coupling can be understood in terms of the interference among the normal modes of coupled waveguides with a grating perturbation. Phase-matching grating periods for maximum reflections are equal to the beat lengths between the two normal modes involved in the coupling process. The reflections are built up constructively (Bragg reflection), resulting in stopbands in the spectral response. The expressions for the grating periods are obtained and compared with those derived from conventional phase-matching conditions
Keywords :
diffraction gratings; harmonic generation; light reflection; optical couplers; optical waveguide theory; Bragg reflection; beat lengths; contra-directional coupling; coupled waveguides; coupled-mode equations; grating periods; grating perturbation; grating-assisted guided-wave devices; harmonic generation; maximum reflections; modal interference; periodic grating; power coupling; space-harmonics; spectral response; stopbands; transfer matrix method; vector nonorthogonal coupled-mode formulation; Arrayed waveguide gratings; Distributed feedback devices; Equations; Frequency conversion; Gratings; Interference; Optical frequency conversion; Optical reflection; Optical transmitters; Optical waveguides; Reflection; Transmission line matrix methods;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/50.144907
Filename :
144907
Link To Document :
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