In this study, optical carrier and data, which is coming from the 1550 nm. CW laser-diode is modulated by using an external optical modulator. The noise that is obtained from the Gaussian white noise source is added to the modulated signal with the help of optical combiners. This combined signal is inputted to the Raman Amplifier and the data is transmitted in a 80 km. fiber optic transmission system. The system is implemented by using chaotic communication technique and the chaotic signal is obtained out of laser diode. Non-return to zero (NRZ) network system is selected in the design.