Materials, Photonic Devices, and Sensors

Multimode waveguide spot size width converter for silicon photonics applications

[+] Author Affiliations
Salwa El-Sabban

Helwan University, Faculty of Engineering, Electronics and Communication Engineering Department, 1 Sherif Street, Helwan, Cairo 11792, Egypt

Diaa Khalil

Ain-Shams University, Faculty of Engineering, Electronics and Communication Engineering Department, 1 Elsarayat Street, Abbassia, Cairo 11317, Egypt

Opt. Eng. 54(3), 037103 (Mar 10, 2015). doi:10.1117/1.OE.54.3.037103
History: Received November 29, 2014; Accepted February 18, 2015
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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 >100μm, 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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Topics

Waveguides

Citation

Salwa El-Sabban and Diaa Khalil
"Multimode waveguide spot size width converter for silicon photonics applications", Opt. Eng. 54(3), 037103 (Mar 10, 2015). ; http://dx.doi.org/10.1117/1.OE.54.3.037103


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