A Design Procedure for High-Performance, Rib-Waveguide-Based Multimode Interference Couplers in Silicon-on-Insulator

Single mode silicon-on-insulator rib waveguides offer a weak lateral confinement, which makes it difficult to design high-performance multimode interference couplers (MMIs) based on these waveguides. Here, a complete design procedure for single etch step MMIs with tapered rib access waveguides is pr...

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Bibliographic Details
Published in:Journal of lightwave technology 2008-08, Vol.26 (16), p.2928-2936
Main Authors: Halir, R., Molina-Fernandez, I., Ortega-Monux, A., Wanguemert-Perez, J.G., Dan-Xia Xu, Cheben, P., Janz, S.
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Applied sciences
Circuit properties
Confinement
Couplers
Design
Electric, optical and optoelectronic circuits
Electronics
Etching
Exact sciences and technology
Integrated optics. Optical fibers and wave guides
Interference
multimode interference (MMI)
Noise levels
Optical and optoelectronic circuits
Optical device fabrication
Optical losses
Optical waveguides
Polarization
Programmable control
rib waveguide
Silicon on insulator technology
silicon-on-insulator
Tolerances
Waveguide transitions
Waveguides
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Summary:Single mode silicon-on-insulator rib waveguides offer a weak lateral confinement, which makes it difficult to design high-performance multimode interference couplers (MMIs) based on these waveguides. Here, a complete design procedure for single etch step MMIs with tapered rib access waveguides is presented, which yields low excess loss (0.1 dB) and good imbalance (0.02 dB). Furthermore, polarization dependence is low, and high fabrication tolerances are achieved, especially with respect to etch depth.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2007.914511