DocumentCode :
1349969
Title :
Flat Band Slow Light With High Coupling Efficiency in One-Dimensional Grating Waveguides
Author :
Bao, Changjing ; Hou, Jin ; Wu, Huaming ; Cassan, Eric ; Chen, Lin ; Gao, Dingshan ; Zhang, Xinliang
Author_Institution :
Wuhan Nat. Lab. for Optoelectron., Huazhong Univ. of Sci. & Technol., Wuhan, China
Volume :
24
Issue :
1
fYear :
2012
Firstpage :
7
Lastpage :
9
Abstract :
Flat band slow light with high coupling efficiency is achieved in a simple one-dimensional grating waveguide. An ideal flat band indicating slow light with group index of 18.3 and bandwidth of 10.3 nm is obtained by plane wave expansion calculation. This result is also verified by inputting a Gaussian pulse into a 48.7-μm -long waveguide in a finite-difference time-domain simulation, in which optical pulse delay of 2.85 ps and group index of 17.54 can be observed. Meanwhile, by introducing a step taper, the coupling efficiency could be improved remarkably from below 20% for butt coupling to 70%. The proposed structure is an ideal candidate for wideband and compact low loss slow light delay lines or optical buffers in on-chip signal processing.
Keywords :
delays; diffraction gratings; finite difference time-domain analysis; optical waveguides; slow light; Gaussian pulse; compact low loss slow light delay lines; coupling efficiency; finite-difference time-domain simulation; flat band slow light; group index; on-chip signal processing; one-dimensional grating waveguides; optical buffers; optical pulse delay; plane wave expansion calculation; size 48.7 mum; Couplings; Dispersion; Gratings; Indexes; Optical waveguides; Photonic crystals; Slow light; Dispersion; grating; slow light; waveguide;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2011.2171935
Filename :
6045310
Link To Document :
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