ED23X4B series C-Band booster amplifier is designed for the application of single channel or 1~8 continous ribbon channels (ITU wavelength). Generally,fiber CATV system operates in single wavelength that has no strict requirement on gain flatness. ED23X4B booster amplifier is featured with low NF,high-saturated output power. It is applicable for central bureau and line relay, as well as optical communication network. ED23X4B is applied most commonly and widely compared with other EDFA CATV system.