Contradirectional couplers in silicon-on-insulator rib waveguides

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 nar...

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Bibliographic Details
Published in:Optics letters 2011-10, Vol.36 (20), p.3999-4001
Main Authors: SHI, W, WANG, X, ZHANG, W, CHROSTOWSKI, L, JAEGER, N. A. F
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Integrated optics. Optical fibers and wave guides
Optical and optoelectronic circuits
Optical elements, devices, and systems
Optical waveguides and coupleurs
Optics
Physics
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.36.003999