INVESTIGATING PERFORMANCE (BER, SNR) OF ANALOG RADIO-OVER-FIBER (ARoF) AND DIGITAL RADIO-OVER-FIBER (DRoF) SYSTEMS
Abstract
In this paper, we present two typical models of Analog Radio-over-Fiber (ARoF) and Digital Radio-over-Fiber (DRoF) systems that transmission distance is shorter than 120 km. Signal-to-noise ratio (SNR) and bit error rate (BER) in two systems are shown. Matlab-based programme then is written and run to draw graphs and compare the performance (BER, SNR) of two systems corresponding to direct detection and coherent detection for various demodulation methods such as ASK, FSK, PSK including synchronous, asynchronous heterodyne and homodyne techniques. The performance comparison of the two systems is conducted in many different cases such as changing optical power of transmitter (PTX), transmission distance (d), optical power of local oscillator (PLO). We quantitatively determine the BER improvement of DRoF system compared to ARoF when they have the same value of system parameters. Typically, with d = 90 km and PTX = 1 dBm, Direction-Detection ARoF system has BER value of »10-10, DRoF system has a greatly improved BER value (BER »10-23). As for Coherent-Detection synchronous heterodyne PSK configuration with d = 100 km, PLO = 3 dBm, ARoF and DRoF systems achieve BER value of »10-18 and of »10-23 respectively.
