铌酸锂
材料科学
光学
耦合损耗
波导管
光电子学
功率分配器和定向耦合器
波长
数值孔径
光纤
物理
作者
Changran Hu,Oscar H. Franco,Tingan Li,Xuanhao Wang,Yuheng Liu,Shiqi Tao,Cheng Zeng,Jinsong Xia
出处
期刊:Optics Express
[The Optical Society]
日期:2021-01-26
卷期号:29 (4): 5397-5397
被引量:101
摘要
Lithium niobate (LN) devices have been widely used in optical communication and nonlinear optics due to its attractive optical properties. The emergence of the thin-film lithium niobate on insulator (LNOI) improves performances of LN-based devices greatly. However, a high-efficient fiber-chip optical coupler is still necessary for the LNOI-based devices for practical applications. In this paper, we demonstrate a highly efficient and polarization-independent edge coupler based on LNOI. The coupler, fabricated by a standard semiconductor process, shows a low fiber-chip coupling loss of 0.54 dB/0.59 dB per facet at 1550 nm for TE/TM light, respectively, when coupled with an ultra-high numerical aperture fiber (UHNAF) of which the mode field diameter is about 3.2 μm. The coupling loss is lower than 1dB/facet for both TE and TM light in the wavelength range of 1527 nm to 1630 nm. A relatively large tolerance for optical misalignment is also proved, due to the coupler’s large mode spot size up to 3.2 μm. The coupler shows a promising stability in high optical power and temperature variation.
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