Performance investigation for the WDM-passive optical network using multicarrier source

Abstract In this article, the comb wavelength division multiplexing passive optical network (Comb WDM-PON) system has been simulated. Simulation models were created in VPI photonics. The proposed system employs 140 Gbps for seven comb lines. Analytical modelling and simulations are performed for a flat comb source with seven comb lines, variable channel spacing, and a center wavelength. As a result, the performance of the comb WDM-PON system that utilizes a single differential Mach–Zehnder (DiffMZ) modulator comb source is also investigated using different comb line numbers. The total capacity of the system increases as the number of comb lines increases. However, the system performance is degraded. Data rates of 80 Gbit/s can be achieved at the threshold bit error rate of BER (1 × 10−9), over a transmission distance of 200 km using 4 comb lines with a multi-diagonal (MD) code for 4 OLTs.