[Racus Laser: C/L band gain optical fiber has been supplied to head communication equipment manufacturers in batches] On September 16th, Raycus Laser stated on the interactive platform that Ruixin, a subsidiary of Raycus Laser, leads the country in the special optical fiber technology, covering the two major directions of high-speed ground transmission and air and space radiation resistance. Self-developed erbium-doped and erbium-ytterbium co-doped optical fibers are suitable for 400G/800G high-speed data communications, 5G bearer networks and trunk line DWDM transmission systems. C/L-band gain optical fibers have been supplied to head communication equipment manufacturers in batches. A number of radiation-resistant optical fiber products have been developed and implemented, achieving national production of raw materials and benchmarking their performance against first-class overseas competitive products. At this stage, they have entered into multi-scenario verification to provide localized key optical fiber reserves for extreme working conditions in space such as satellite inter-satellite communications.