Towards Gigabit-scale digital signal storage enabled by a distributed Raman-amplified optical memory

1. State Key Laboratory of Optical Field Manipulation Science and Technology, Institute of Optics and Electronics, ChineseAcademy of Sciences, Chengdu 610209, China 2. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu610209, China 3. Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China