DocumentCode :
1075448
Title :
Optimal design of an MMI coupler for broadening the spectral response of an AWG demultiplexer
Author :
Dai, Daoxin ; Liu, Shuzhe ; He, Sailing ; Zhou, Qincun
Author_Institution :
Centre for Opt. & Electromagn. Res., Zhejiang Univ., Hangzhou, China
Volume :
20
Issue :
11
fYear :
2002
fDate :
11/1/2002 12:00:00 AM
Firstpage :
1957
Lastpage :
1961
Abstract :
Optimal design of a multimode interference (MMI) coupler for broadening the spectral response of an arrayed-waveguide grating (AWG) demultiplexer is considered. By using a Gaussian beam approximation, an analytical expression for the spectral response of an AWG demultiplexer (with an MMI section) is obtained. A simple analytical formula is derived to relate the optimal MMI length to the separation between the peaks of the twofold images in the MMI region. This peak separation is related to the width of the MMI section. In the proposed design method, a required 1-dB passband width determines the peak separation, which then determines the optimal value for the length of the MMI section according to the analytical formula. The designed flat-top AWG demultiplexer is verified by the beam propagation method.
Keywords :
arrayed waveguide gratings; demultiplexing equipment; light interference; optical communication equipment; optical couplers; optical design techniques; wavelength division multiplexing; AWG demultiplexer; Gaussian beam approximation; MMI coupler; MMI section width; arrayed-waveguide grating; beam propagation method; design method; designed flat-top AWG demultiplexer; multimode interference coupler; optimal MMI length; optimal design; peak separation; simple analytical formula; spectral response broadening; twofold images; Arrayed waveguide gratings; Design methodology; Electromagnetic waveguides; Helium; Interference; Laboratories; Optical filters; Optical waveguides; Passband; Wavelength division multiplexing;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.2002.806330
Filename :
1161606
Link To Document :
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