| Popis: |
This paper focuses on analyzing, at the simulation level, the effect of the M-ary Quadrature Amplitude Modulation (M-QAM) technique, for an OFDM-RoF converged network infrastructure based on the XGS-PON standard, with a 10 Gbps capacity for a point-to-point downlink and an FTTH application, with an operating wavelength of 1550 nm or 193.4 THz (overlayed OFDM-RoF/XGS-PON system). The above, with the purpose of determining the network performance, as both the order of the M-QAM modulation and the distance of the optical link are increased, considering that the performance of a radio over optical fiber system can be significantly degraded by nonlinear phenomena present in the optical link, as well as noise and distortion phenomena that affect the signal quality. In the results of the research, the increase in the order of the M-QAM modulation allows us to represent more bits per symbol, however, a higher transmission power is required. Finally, it is considered that it is possible to develop a robust OFDM-RoF converged network infrastructure for speeds in the order of 10 Gbps for the last mile services, since it uses the advantages of both wireless and optical technologies. |
