This laser transmitter is important equipment to built CATV HFC network. It is mainly used for long distance optical fiber transmission of television signal, dig-ital TV signal telephone voice signal and data. High performance DFB laser , we select famous brand from the international market for our products as light source. RF power digital automatic processing technology developed and operated by ourselves and RF pre-distortion circuit are used in the part of RF drive. Microcomputer automatic control system is built-in it to ensure excellent performance..