City Research Online

Abstract

We report an improved version of a spot-size converter (SSC) consisting of a silicon nanowire evanescently coupled to a phase-matched Poly-Si multilayer structure. With wider transversal dimensions the multilayer structure expands the mode significantly thus increasing the coupling efficiency with the conventional single-mode fiber. Detailed optimization process of a 17-layer based SSC is discussed and its coupling efficiency with a high-NA fiber of radius 2 μm is obtained as 98% providing only 0.087 dB loss. Vertical alignment tolerance between the optimized SSC and a high-NA fiber of radius 2 μm is also shown. This novel design does not consist of a taper and can be fabricated by using CMOS compatible process. It has a short device length and more relaxed alignment tolerances with the fiber. Full-vectorial and computationally efficient finite element method and the least squares boundary residual method have been used for the analysis and optimization of the proposed structure.

Publication Type:	Article
Additional Information:	The final publication is available at link.springer.com via http://dx.doi.org/10.1007/s11082-017-1066-8
Publisher Keywords:	Spot-size converter, Multilayers, Integrated optics, Silicon, photonics
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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