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

Author:
Zhong, Qiuhang H  Veerasubramanian, Venkat  Wang, Yun  Shi, Wei  Patel, David  Ghosh, Samir  Samani, Alireza  Chrostowski, Lukas  Bojko, Richard  Plant, David V.  


Journal:
OPTICS EXPRESS


Issue Date:
2014


Abstract(summary):

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 mu m x 20 mu m is realized by curving the gratings in a focusing scheme. (C) 2014 Optical Society of America


Page:
18224---18231


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