Journal
OPTICS EXPRESS
Volume 29, Issue 17, Pages 27396-27403Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.430644
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Funding
- Science and Technology Planning Project of Hunan Province [2018JJ1033]
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This paper discusses methods for achieving high-efficiency coupling in integrated nanophotonic chips, analyzes factors affecting coupling efficiency, and proposes a scheme to improve coupling efficiency. The theoretical feasibility of the scheme was validated through experimentation, laying the foundation for the integration of photonic devices and optical fibers.
Because on-chip integration of light sources cannot be realized effectively now, integrated nanophotonic chips must couple external light to the integrated photonic waveguide with high efficiency. Realizing high efficiency coupling requires a low-loss coupling structure. In this paper, the factors allowing high efficiency coupling to be realized are analyzed theoretically and the coupling between a lensed fiber and a tapered silicon nitride (Si3N4) waveguide is realized experimentally. Because the coupling efficiency of this structure is not ideal in the experiment, a scheme of direct alignment between the lensed fiber and a cantilever waveguide is proposed. Although the scheme offers a very high coupling efficiency in theory, because of the warpage of the waveguide they cannot be directly aligned experimentally. Finally, this paper advances a scheme for the tapered fiber to be directly overlapped onto the Si3N4/SiO2 cantilever. It is found that the coupler maintains an ideal coupling efficiency for wavelength from 1530 nm to 1600 nm, laying a foundation for the integration of nano-photonic devices and optical fibers. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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