作者
W Shi, X Wang, W Zhang, L Chrostowski, NAF Jaeger
发表日期
2011/10/15
期刊
Optics letters
卷号
36
期号
20
页码范围
3999-4001
出版商
Optica Publishing Group
简介
We demonstrate contradirectional couplers in silicon-on-insulator rib waveguides using a CMOS compatible technology, in which a periodic dielectric perturbation is introduced in the coupling region between two different-sized rib waveguides. This structure enables high fabrication tolerances for narrow-bandwidth add-drop filters, using commercially available deep-ultraviolet lithography, that do not suffer from having a free spectral range. The simulation using coupled-mode theory and mode-profile calculations shows good agreement with experiment. A narrow bandwidth of 0.35?nm and a low loss of less than 1?dB have been achieved experimentally.
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W Shi, X Wang, W Zhang, L Chrostowski, NAF Jaeger - Optics letters, 2011