If imported raw materials are used, the cost will be lower than inland, and the technical exchange atmosphere in Shenzhen is relatively strong. First-line manufacturers of Shenzhen optical module: Motel Technology, second-line manufacturers of Xinfeitong Shenzhen optical module: Wan Zhaotong, Feibochuang Shenzhen optical module third-line manufacturers: Yi Jixingtong Wu Hanyou's advanced optical communication technologies, such as Huagong, are all first-line manufacturers in Wuhan, and the R&D centers of Shenzhen manufacturers such as Motel Technology are also located in Wuhan. Relying on Wuhan's technological advantages,