期刊
APPLIED OPTICS
卷 60, 期 16, 页码 4814-4819出版社
OPTICAL SOC AMER
DOI: 10.1364/AO.425773
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资金
- National Key Research and Development Program of China [2017YFA0206401]
- National Natural Science Foundation of China [62004105]
- Science and Technology Support Program of Jiangsu Province [BE2019101]
- Fund of Nanjing Electronic Devices Institute [1911N291]
A multi-tip edge coupler was proposed to address the mode size mismatch between LNOI waveguide and DFB laser, showing its practical potential in the production of effective LNOI integrated chips.
Lithium niobate-on-insulator (LNOI) has been emerging as a popular integration platform for optical communications and microwave photonics. An edge coupler with high coupling efficiency, wide bandwidth, high fabrication and misalignment tolerance, as well as a small footprint is essential to couple light in or out of the LNOI chip. Some edge couplers have been demonstrated to realize fiber-to-chip coupling in the last few years, but the coupling with distributed feedback (DFB) semiconductor laser is rarely studied. In this paper, we propose a multi-tip edge coupler with three tips to reduce the mode size mismatch between the LNOI waveguide and the DFB laser. The tilted sidewall, fabrication tolerance, misalignment tolerance, and facet reflection due to the effective index mismatch are discussed. It shows that the proposed multi-tip edge coupler can be practically used in the production of effective LNOI integrated chips. (C) 2021 Optical Society of America
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