This book aims to explain the transmission of wireless and baseband RF signals via fibre for a long distance in high quality, consuming a low-power budget using Optisystem Software. ROF has achieved an effective delivery of wireless and baseband signal, and has also reduces the power consumption. Whereas recent fast growing broadband access technology through wireless is WiMAX (Worldwide Interoperability for Microwave Access). In this book, the ROF implements into WiMAX. And also we will carry out digital modulation technique QAM .It shows the advantage of transmitting signals via fiber rather than via free space in terms of Q-factor, BER, optical spectrum and Eye diagram.