Transmission of Subcarrier Square Wave in Radio over Fiber Communication System Based on FPGA

To avoid the disadvantages of Radio over Fiber (RoF) communication system in optical domain modulation, subcarrier modulation in electrical domain using Field- Programmable Gate Array (FPGA) is proposed to generate baseband subcarrier square wave. Then the subcarrier signal is modulated to optical signal using optical fiber experimental box, which can be transmitted through optical fiber. The waveform of the original square wave can be observed on the oscilloscope after the transmission through the optical fiber system with good effect. The experimental results show that subcarrier modulation can be done in electrical domain, which prove the feasibility of subcarrier modulation in the electrical domain using FPGA, and providing another way of subcarrier modulation.