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Proceedings Paper

Bend-size reduction on the SOI rib waveguide platform
Author(s): Timo Aalto; Matteo Cherchi; Mikko Harjanne; Sami Ylinen; Markku Kapulainen
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Paper Abstract

The minimum bending radius of optical waveguides is typically the most important parameter that defines the footprint and cost of a photonic integrated circuit. In optical fibers and in planar waveguides with equally large mode fields (~10 μm) the bending radii are typically in the cm-scale. The main advantage of using a high index waveguide core with a thickness below 1 μm is the ability to realise single-mode bends with bending radii of just a few micrometers. In this paper we review the dependence of the minimum bending radius on the size and shape of waveguides with the main emphasis on silicon-on-insulator (SOI) waveguides. Then we present simulation and measurement results from advanced waveguide bends and mirrors that have been integrated with 4-10 μm thick single-mode SOI waveguides. We show that multi-step patterning and novel designs allow the reduction of the bending radius by up to three orders of magnitude while also reducing the bending losses by approximately one order of magnitude when compared to traditional rib waveguide bends on 4 μm SOI. This allows to use the μm-scale SOI waveguides for making almost as compact photonic integrated circuits as those based on sub-μm SOI waveguides.

Paper Details

Date Published: 14 March 2013
PDF: 11 pages
Proc. SPIE 8629, Silicon Photonics VIII, 86290D (14 March 2013); doi: 10.1117/12.2002349
Show Author Affiliations
Timo Aalto, VTT Technical Research Ctr. of Finland (Finland)
Matteo Cherchi, VTT Technical Research Ctr. of Finland (Finland)
Mikko Harjanne, VTT Technical Research Ctr. of Finland (Finland)
Sami Ylinen, VTT Technical Research Ctr. of Finland (Finland)
Markku Kapulainen, VTT Technical Research Ctr. of Finland (Finland)

Published in SPIE Proceedings Vol. 8629:
Silicon Photonics VIII
Joel Kubby; Graham T. Reed, Editor(s)

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