In many opto-electronic system, the requirements to the ability of optical filtering and optical frequency discrimination become higher and higher. If the traditional optical techniques are used, the problems of system stability, technical complications and costs of the system will be encountered. However, by using the high optical resolution technique based on atomic transitions, most of problems mentioned above can be overcome. When the atomic transition technique is used in the optical receiver, the same technique must be used in optical transmitter to control the laser frequency. In this way, an atomic transition controlled optical channel is formed. Here the function, principle and structure of an atomic controlled channel and some opto-electronic system using atomic channel technology are presented.