City Research Online

Abstract

The coupling between a silicon nanowire (NW) and a single mode fiber (SMF) is challenging. Design and optimization of compact spot-size converters (SSCs) for silicon photonics devices are presented by using numerically efficient and rigorous full-vectorial finite-element based approaches. The multi-Poly-Silicon layers based SSCs are proposed and optimized for the quasi-TE and quasi-TM polarizations sequentially. The coupling losses can be reduced to 2.72 dB and 2.45 dB for the quasi-TE and quasi-TM polarizations, respectively by using an eleven Poly-Si layers based SSC. A polarization-independent SSC is also proposed based on the phase-matched multi-Poly-Silicon layer and lower taper waveguide for both the quasi-TE and quasi-TM polarizations. Coupling to a lensed fiber with the radius of 2 μm, the optimized polarization-independent SSC is with the coupling losses of 0.34 and 0.25 dB for the quasi-TE and quasi-TM polarizations, respectively. The on-chip integrated SSC opens up the feasibility of a low cost passive aligned fiber-pigtailed electronic-photonics integrated circuits platform.

Publication Type:	Article
Additional Information:	© Copyright (2019) Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
Publisher Keywords:	Silicon photonics; spot-size converter; multi-layer waveguide; FEM; LSBR
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering

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