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Focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces

Publication Type:

Journal Article

Source:

Optics Express, OSA, Volume 22, Number 15, p.18224--18231 (2014)

URL:

http://www.opticsexpress.org/abstract.cfm?URI=oe-22-15-18224

Keywords:

Gratings; Subwavelength structures

Abstract:

We report on the design and characterization of focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces. With implementation of waveguide dispersion engineered subwavelength structures, an ultra-wide 1-dB bandwidth of over 100 nm (largest reported to date) near 1550 nm is experimentally achieved for transverse-electric polarized light. By tapering the subwavelength structures, back reflection is effectively suppressed and grating coupling efficiency is increased to −4.7 dB. A compact device footprint of 40 µm x 20 µm is realized by curving the gratings in a focusing scheme.

Full Text:

http://dx.doi.org/10.1364/OE.22.018224

Faculty Member(s): 
Lukas.Chrostowski
Research Area(s): 
Photonics and Optics