Efficient fiber-to-chip grating coupler for micrometric SOI rib waveguides

Optics Express
C Alonso-RamosRobert Halir

Abstract

Grating couplers are an efficient means for fiber to chip coupling, as they require no facet preparation and enable wafer scale testing. While grating couplers are commonly used in silicon wire waveguides, their application to micrometric silicon-on-insulator rib waveguides is complicated due to the presence of high-order Bloch modes. We study the Bloch modes behavior and their excitation determined by access waveguide design. The latter is implemented to enable single Bloch mode excitation. The use of a design process based on modal analysis is proposed. A grating coupler is proposed in silicon-on-insulator with 1.5 microm thick silicon layer that achieves a coupling efficiency of 65.6% at 1.55 microm. The structure, including interconnection waveguides, access waveguide and grating can be fabricated using a single lithography step.

References

Feb 2, 2002·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Qing CaoJean-Paul Hugonin
Aug 9, 2003·Optics Letters·Vilson R AlmeidaMichal Lipson
Dec 21, 2004·Optics Letters·Dirk TaillaertRoel Baets
May 5, 2009·Optics Letters·Robert HalirJuan G Wangüemert-Pérez
Dec 29, 2003·Optics Express·Anita SureDennis Prather
Nov 27, 2006·Optics Express·Günther RoelkensRoel Baets

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Citations

Jul 19, 2011·Optics Letters·C Alonso-RamosB Lamontagne
Aug 14, 2013·Optics Letters·Sebastian Romero-GarcíaJeremy Witzens
Jun 22, 2013·Optics Express·Sebastian Romero-GarcíaJeremy Witzens
Nov 3, 2017·Optics Express·Milos NedeljkovicGoran Z Mashanovich

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