Low loss mode size converter from 0.3 /spl mu/m square Si wire waveguides to singlemode fibres

By T. Shoji, T. Tsuchizawa, Toshifumi Watanabe, K. Yamada, H. Morita. 2002

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Coupling strategies for silicon photonics integrated chips [Invited] (2019, methodology): “2 5 E-TM EC: 3 μm × 3 μm polymer SSC, wt 60 nm, l t 200 μm [18] 3.”
Fabrication-Tolerant Waveguide Chirped Grating Coupler for Coupling to a Perfectly Vertical Optical Fiber (2008, background): “The main advantages of such grating couplers over alternative techniques using adiabatic tapers and polished facets [10]–[12] include the capability to place the coupler anywhere on a chip (they need not be located at the edge of a die), no need for facet polishing, and compatibility with wafer-scal”
Review of Silicon Photonics Technology and Platform Development (2021, background): “[12] along with splitters [13], crossings [14], and many other types of passive devices [15]–[17].”
A Grating-Coupler-Enabled CMOS Photonics Platform (2011, background): “Inverse lateral tapers [9], [10] decrease the waveguide width”
Silicon photonic integration in telecommunications (2015, methodology): “A typical method is to use an inverse taper, in which the waveguide is narrowed down to a small tip, causing the optical mode to expand very large [8].”