Abstract Semiconductor optical amplifier (SOA) is a well known non-linear device which can exhibit Tera Hertz switching speed of operation. SOA based switching, therefore, has wide application in fiber optic communication. Here in this communication the authors propose a new concept of frequency encoded parallel data transmission with SOA for optical communication. To achieve the transmission SOA is suggested for the generation of frequency encoded/decoded parallel data. It converts initially an intensity encoded optical data to frequency encoded one; whereas at the receiving end it again returns the intensity encoded data from frequency encoded one.