Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 32, Issue 17, Pages 1077-1080Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2020.3011188
Keywords
Couplers; Couplings; Silicon; Loss measurement; Waveguide discontinuities; Optical fiber couplers; Integrated optics; edge coupler; silicon waveguides
Funding
- National Key Research and Development Program of China [2018YFB2200201, 2018YFB2200200]
- National Science Fund for Excellent Young Scholars [61922070]
- National Natural Science Foundation of China [61675178]
- ZJU-Sunny Photonics Innovation Center [2019-05]
- Fundamental Research Funds for the Central Universities
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In this work, we demonstrate an edge coupler (EC) for the coupling between the single mode fiber (SMF) and the silicon photonic waveguide. High coupling efficiency can be achieved by using arrayed waveguides at 1550 nm with an un-patterned cladding. With such a design, the light will be pulled to the top cladding, avoid the using of a cantilever structure. Compared to the conventional inverse taper spot size converter, the widths for the arrayed waveguides are the same, thus it is not critical to determine the position of the end facet for dicing/polishing. We fabricated the proposed structure with only one-step lithography following by a dry etching process. The measured coupling loss is around 1.7 dB/facet, which agrees well with the simulations.
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