期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 52, 期 21, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ab07d5
关键词
spot size converters; inverse tapers; vertical coupling
资金
- European Union Horizon H2020 Programme (H2020-ICT27-2015, COSMICC) [688516]
- European Union Research Council (ERC) [337508]
- European Research Council (ERC) [337508] Funding Source: European Research Council (ERC)
In recent years, the monolithic integration of new materials such as SiN, Ge and LiNbO3 on silicon (Si) has become important to the Si photonics community due to the possibility of combining the advantages of both material systems. However, efficient coupling between the two different layers is challenging. In this work, we present a spot size converter based on a two-tier taper structure to couple the optical mode adiabatically between Si and SiN. The fabricated devices show a coupling loss as low as 0.058 dB +/- 0.01 dB per transition at 1525 nm. The low coupling loss between the Si to SiN, and vice versa, reveals that this interlayer transition occurs adiabatically for short taper lengths (< 200 mu m). The high refractive index contrast between the Si and SiN is overcome by matching the optical impedance. The proposed two-tier taper structure provides a new platform for optoelectronic integration and a route towards 3D photonic integrated circuits.
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