First Demonstration of MWDM-Based 400G-LR4 over 10-km SSMF Supporting 400GE and OTN Dual Rates. - Dong Wang 022; Mingqing Zuo; Wei Zhang; Tao Lin; Jiang Sun; Tao Gui; Wupin Zhang; Dawei Ge; Chendi Jiang; Chenggang Liu; Yunbo Li; Changsheng Li; et al. (OFC, 2023)