铌酸锂
材料科学
光学
混合耦合器
波导管
光电子学
功率分配器和定向耦合器
波长
鼠道耦合器
插入损耗
薄膜
楔形(几何)
物理
纳米技术
作者
Yake Chen,Xiaojun Xie,Yang Sun,Wei Pan,Lianshan Yan
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2024-01-30
卷期号:49 (5): 1145-1145
被引量:4
摘要
We performed an experimental demonstration of a wedge-shaped optical 90° hybrid coupler on the thin-film lithium niobate (TFLN) platform, utilizing a paired-interference-based 2 × 4 multimode interference (MMI) coupler and a general-interference-based 2 × 2 MMI coupler. The fabricated optical 90° hybrid coupler has a compact footprint with a width of 18 µm and a length of 134 µm. In a coherent receiving system, the hybrid coupler directly connects to the balanced photodiode array, eliminating the need for waveguide crossings or cascaded phase shifters. The device exhibits a < 1.1 dB excess loss, a > 20 dB common-mode rejection ratio (CMRR), a < 1.3 dB wavelength sensitive loss, and a < ±5° phase deviation over a spectral range of 1530-1560 nm, which is promising to enable a compact heterogeneously integrated coherent receiving system on the thin-film lithium niobate platform.
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