The 6G CWDM are high performance, cost effective modules for serial optical data communications such as CPRI and OBSAI. which is supporting Multi Rate Up to 6.144Gbps, and transmission distance up to 80km on SM fiber. It consists of two sections: The transmitter section incorporates a CWDM DFB driver and re-timer. The receiver section consists of a PIN photodiode integrated with a transimpedance preamplifier (TIA). The module is hot pluggable into the 20-pin connector. The high-speed electrical interface is base on low voltage logic, with nominal 100 Ohms differential impedance and AC coupled in the module.