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Optical Engineering

Multimode waveguide spot size width converter for silicon photonics applications
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Paper Abstract

We present the design of a parabolic multimode waveguide used as a spot size width converter. The designed structure allows reducing the input spot size width an order of magnitude using a very short structure with respect to linear or conventional tapers. An illustrative example of spot width reduction from 10 microns to a Si wire of 1 micron with a small length in the order of 17 microns and a coupling efficiency of ∼90% is presented. Using a linear taper structure with a taper length >100  μm, the coupled power is still less than that obtained by the parabolic multimode interference (PMMI) guide. This means that the PMMI offers a length reduction of more than with respect to the linear taper to achieve the same spot reduction.

Paper Details

Date Published: 10 March 2015
PDF: 6 pages
Opt. Eng. 54(3) 037103 doi: 10.1117/1.OE.54.3.037103
Published in: Optical Engineering Volume 54, Issue 3
Show Author Affiliations
Salwa El-Sabban, Helwan Univ. (Egypt)
Diaa Khalil, Ain-Shams Univ. (Egypt)

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