Design and optimization of compact spot-size converters for silicon photonic devices

B. M. Azizur Rahman, Weifeng Jiang, Sailing He, El-Hang Lee
2019 Smart Photonic and Optoelectronic Integrated Circuits XXI  
Citation: Rahman, B. M. A. ORCID: 0000-0001-6384-0961 and Jiang, W. (2019). Design and optimization of compact spot-size converters for silicon photonic devices. 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
more » ... con 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 polarizationindependent 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 electronicphotonics integrated circuits platform.
doi:10.1117/12.2513193 fatcat:o4l346tvzjc5bgn74xqg7tjk5i