多路复用器
波分复用
通道间距
光学
天文干涉仪
多路复用
功率分配器和定向耦合器
插入损耗
材料科学
制作
带宽(计算)
干涉测量
马赫-曾德尔干涉仪
波长
光学滤波器
串扰
物理
光电子学
计算机科学
电信
病理
医学
替代医学
作者
Laiwen Yu,Jingshu Guo,Hengtai Xiang,Guo‐Zhen Yang,Yuqi Zhao,Yuanrong Li,Daoxin Dai
摘要
Using cascaded Mach-Zehnder interferometers (CMZIs) provides an attractive option for realizing coarse wavelength-division (de)multiplexing (CWDM) filters with low losses, low crosstalk, flat tops, and high scalability. However, they usually have large footprints and insufficient fabrication tolerances, due to the inferior performance of conventional directional couplers (DCs) used for MZIs. Here, a four-channel CMZI wavelength-division (de)multiplexer based on novel Bezier-shape DCs with compact footprints, broad bandwidths and decent fabrication tolerances. For the fabricated (de)multiplexer with 20-nm channel spacing, the excess loss is less than 0.5 dB and the crosstalk is lower than -19.5 dB in the 1-dB bandwidth of 12.8 nm. For the case with a core-width deviation of ±20 nm, the device still performs very well with low losses and low crosstalk. Compared to the state-of-the-art MZI-based CWDM filters, the present device has slightly high performances and a footprint of 0.012 mm2 shrunk greatly by ∼3-folds. This work can be extended for more channels and other material platforms.
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