Design of an X-cut thin-film lithium niobate waveguide as a passive polarization rotator
Design of an X-cut thin-film lithium niobate waveguide as a passive polarization rotator
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DOI：
10.1364/oe.445412
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发表时间：
2021-12
期刊：
影响因子：
3.8
通讯作者：
Luis Cortes Herrera;Xiaotong He;Jaime Cardenas;Govind P. Agrawal
中科院分区：
文献类型：
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作者：
Luis Cortes Herrera;Xiaotong He;Jaime Cardenas;Govind P. Agrawal
X切薄膜锂酸盐波导的横电模和横磁模在与晶体Z轴（光轴）成斜角时，其有效折射率和交换功率发生变化。我们利用这种现象来设计一个被动基模偏振旋转器。在我们的设计中，锂离子酸盐波导相对于其Z轴以最佳角度倾斜，使得材料各向异性引起相位匹配的偏振转换。我们讨论了旋转器的理想器件长度，串扰和带宽。所提出的设计产量紧凑（小于1毫米），低损耗，无源偏振旋转电信波长。
: The transverse-electric and transverse-magnetic modes of an X-cut thin-film lithium niobate waveguide vary in effective indices and exchange power when the waveguide makes an oblique angle with its crystallographic Z-axis, i.e. its optics axis. We leverage this phenomenon to design a passive fundamental-mode polarization rotator. In our design, the lithium niobate waveguide is tilted at an optimum angle with respect to its Z-axis, such that material anisotropy induces phase-matched polarization conversion. We discuss the rotator’s ideal-device length, crosstalk, and bandwidth. The proposed design yields compact (shorter than 1 mm), low-loss, passive polarization rotators for telecom wavelengths.