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... The DACs are a vital component of the OFDM systems; hence, extra complexity must not be incurred on transmitter if taking advantage of the arbitrary arrangement of the constellation points in the I/Q plane. The complexity can increase at the receiver owing for the need of 2-D decision unit at searching table rather than a normal QAM slicer [29]. ...
The use of optical-OFDM systems is mainly restricted by their limited dynamic range as a result of a high peak to average power ratio (PAPR) and nonlinear distortion (NLD). Radio-over-Fiber (RoF) systems are mainly deployed for light modulation and mm-wave signals transmission over fiber links. This paper evaluated the performance of RoF links with respect to their external modulation in a bid to highlight the challenges attributable to the various optical system components. The Mach-Zehnder Modulator (MZM) have been used in external modulation; it is a tested modulation scheme for quadrature amplitude modulation QAM (a vector modulation format) where signal subcarriers are generated using an OFDM scheme. Simulation results based on Optisystem 13 software exposes that the receiver performance of the optimum system for achieving has a better Bit Error Rate (BER) and three longest distance as 10, 50, 100 km for 16 QAM-OFDM-RoF system are reached by using optimum receiver launch power.
