Low-loss fiber-to-chip edge coupler for silicon nitride integrated circuits

Author:

Zhu Xiaotian1,Li Guangkuo1,Wang Xiang2,Li Yuhua3,Davidson Roy2,Little Brent E.2,Chu Sai T.1ORCID

Affiliation:

1. City University of Hong Kong

2. QXP Technology Inc.

3. Zhejiang Sci-Tech University

Abstract

Silicon nitride (SiN) integrated optical waveguides have found a wide range of applications due to their low loss, broad wavelength transmission band and high nonlinearity. However, the large mode mismatch between the single-mode fiber and the SiN waveguide creates a challenge of fiber coupling to these waveguides. Here, we propose a coupling approach between fiber and SiN waveguides by utilizing the high-index doped silica glass (HDSG) waveguide as the intermediary to smooth out the mode transition. We achieved fiber-to-SiN waveguide coupling efficiency of lower than 0.8 dB/facet across the full C and L bands with high fabrication and alignment tolerances.

Funder

City University of Hong Kong

Zhejiang Sci-Tech University

National Natural Science Foundation of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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