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10 March 2015 Multimode waveguide spot size width converter for silicon photonics applications
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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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286 /2015/$25.00 © 2015 SPIE
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
JOURNAL ARTICLE
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