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

Authors :
Xiaotian Zhu
Guangkuo Li
Xiang Wang
Yuhua Li
Roy Davidson
Brent E. Little
Sai T. Chu
Source :
Optics Express. 31:10525
Publication Year :
2023
Publisher :
Optica Publishing Group, 2023.

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.

Details

ISSN :
10944087
Volume :
31
Database :
OpenAIRE
Journal :
Optics Express
Accession number :
edsair.doi...........fadf36faaf1cef0ceb3be311650fd0e9