A full-duplex optical fiber/wireless coherent communication system with digital signal processing at the receiver

In this paper, a full-duplex, 120 Gbps optical fiber/wireless system is presented for high-speed and multicasting communication link. Both the wired and wireless systems use Dual Polarization 16 Quadrature Amplitude Modulation (DP-16-QAM) with homodyne detection. Blind Phase Search (BPS) algorithm, Constant Modulus Algorithm (CMA) and Viterbi Phase Estimation (VPE) algorithm are used at the receiver end to compensate for signal distortions such as Chromatic Dispersion (CD), Polarization Mode Dispersion (PMD), nonlinear impairments, frequency and phase mismatch. The system performance is analyzed in terms of Error Vector Magnitude (EVM), Bit Error Rate (BER ≤ 10−12) and constellation diagram based on OptiSystem V.13 simulation platform. The maximum transmission distances achieved are 275 km and 1.1 km for Standard Single Mode Fiber (SSMF) and Free Space Optical Link (FSOL), respectively.