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. 2016 Jan 25;7(2):18. doi: 10.3390/mi7020018

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© 2016 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Coupling loss between two butt-coupled waveguides of different technologies (SiO₂/PSG/SiO₂ [65], InP/InGaAsP [36], SiO₂/Si/Air [27]) as a function of lateral offset δx for two different gaps S = 0 μm and S = 5 μm.