Abstract

Vertical optical mode-size transformation from 260nm-thick Si-nanowaveguide to 10~12?m matching the single-mode-fibre-core has been demonstrated using compact multilayer Si/SiO<sup>2</sup>asymmetric GRIN lens (length:~24?m). GRIN lens to single-mode-fibre practical coupling loss of -3.45 dB was achieved.

© 2010 The Optical Society

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