Experimental demonstration of L-band discrete Raman amplifier using germanium doped photonic crystal fiber with high Raman gain coefficient and low loss. - Hui Zhang; Shiqi Zhou; Li Zhang; Liubo Yang; Yifei Xu; Junjie Qi; Zhaolong Liao; Qiqiang Yang; Yaping Liu; Liyan Zhang; Lei Shen; Lei Zhang 001; et al. (OFC, 2026)