Efficient self-imaging grating couplers on a lithium-niobate-on-insulator platform at near-visible and telecom wavelengths
Efficient self-imaging grating couplers on a lithium-niobate-on-insulator platform at near-visible and telecom wavelengths
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DOI：
10.1364/oe.428138
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发表时间：
2021-06-21
期刊：
影响因子：
3.8
通讯作者：
Pernice, Wolfram H. P.
中科院分区：
文献类型：
--
作者：
Lomonte, Emma;Lenzini, Francesco;Pernice, Wolfram H. P.
绝缘体上锂氧化物（LNOI）已成为集成光子学领域一个有前途的平台。非线性光学过程和快速电光调制在超低损耗波导中具有突出的性能。为了利用LNOI技术提供的优势，需要在不同波长范围内工作的合适的光纤到芯片互连。在这里，我们提出了易于制造的自成像变迹光栅耦合器，其特征在于TE 0模式的耦合效率在λ =1550 nm处高达相似或等于47.1%，在λ =775 nm处相似或等于44.9%。我们的方法避免了使用任何金属背反射器来改善方向性或使用多层结构来增强光栅强度。(C)2021年美国光学学会根据OSA开放获取出版协议的条款
Lithium-niobate-on-insulator (LNOI) has emerged as a promising platform in the field of integrated photonics. Nonlinear optical processes and fast electro-optic modulation have been reported with outstanding performance in ultra-low loss waveguides. In order to harness the advantages offered by the LNOI technology, suitable fiber-to-chip interconnects operating at different wavelength ranges are demanded. Here we present easily manufacturable, self-imaging apodized grating couplers, featuring a coupling efficiency of the TE0 mode as high as similar or equal to 47.1% at lambda=1550 nm and similar or equal to 44.9% at lambda=775 nm. Our approach avoids the use of any metal back-reflector for an improved directivity or multi-layer structures for an enhanced grating strength. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement