中心博士后秦军、舒浩文与博士生沈碧涛等与美国UCSB John Bowers教授课题组关于高效率非线性硅基铝镓砷片上的合作工作 “On-chip high-efficiency wavelength multicasting of PAM3/PAM4 signals using low-loss AlGaAs-on-insulator nanowaveguides” 近期正式发表在Optics Letters期刊上，文章基于超低损耗硅基铝镓砷条形波导，提出了一种基于非线性四波混频效应的针对数据中心PAM3/PAM4信号的组播方法，获得了record high的-11.2dB的平均转换效率。此项工作为业界首次实现如此高效的PAM信号组播。

摘要：Nonlinear optics-based optical signal processing (OSP) could potentially increase network flexibility because of its transparency, tunability, and large bandwidth. A low-loss, high nonlinearity, and compact integrated material platform is always the pursuit of OSP. In this Letter, a high-efficiency, one-to-six wavelength multicasting of 10 Gbaud pulse-amplitude modulation (PAM3/PAM4) signals using a 6 cm long Al_0.2Ga_0.8As-on-insulator nanowaveguide is experimentally demonstrated for the first time, to the best of our knowledge. The low-loss, combined with the high nonlinear coefficient of the AlGaAsOI platform, enables us to achieve −11.2dB average conversion efficiency clear eye diagrams and <2.1dB power penalty at KP4-forward error correction threshold (2.4×10⁻⁴) for all the output PAM3/PAM4 multicasting channels. This result points to a new generation of nonlinear OSP photonic integrated circuits.

论文链接：

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-45-16-4539