Multimode waveguide spot size width converter for silicon photonics applications

Salwa El-Sabban; Diaa Khalil

doi:10.1117/1.OE.54.3.037103

10 March 2015 Multimode waveguide spot size width converter for silicon photonics applications

Salwa El-Sabban, Diaa Khalil

Author Affiliations +

Optical Engineering, Vol. 54, Issue 3, 037103 (March 2015). https://doi.org/10.1117/1.OE.54.3.037103

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 5× with respect to the linear taper to achieve the same spot reduction.

Citation Download Citation

Salwa El-Sabban and Diaa Khalil "Multimode waveguide spot size width converter for silicon photonics applications," Optical Engineering 54(3), 037103 (10 March 2015). https://doi.org/10.1117/1.OE.54.3.037103

Published: 10 March 2015

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