Polarization-independent grating coupler for micrometric silicon rib waveguides.
Opt Lett
; 37(17): 3663-5, 2012 Sep 01.
Article
em En
| MEDLINE
| ID: mdl-22940983
ABSTRACT
Grating couplers are a promising approach to implement efficient fiber-chip coupling. However, their strong polarization dependence makes dual-polarization operation challenging. In this Letter we propose, for the first time, a polarization-independent grating coupler for thick rib silicon-on-insulator (SOI) waveguides. Coupling efficiency is optimized by designing the grating pitch and duty cycle, without varying the bottom oxide thickness, which significantly simplifies practical implementation. Directivity of the grating coupler is enhanced by a high reflectivity layer under the bottom oxide after the selective removal of the Si substrate. Dual-polarization coupling efficiency of -2.8 dB is shown.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Guideline
Idioma:
En
Revista:
Opt Lett
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Espanha