OPTIMIZATION OF OPTICAL SSB-OFDM SYSTEM WITH DIRECT DETECTION FOR APPLICATION IN METROPOLITAN/REGIONAL NETWORKS

摘要

Due to its spectral efficiency, dispersion robustness, simplicity and transparency to electrical modulation format, orthogonal frequency division multiplexing (OFDM) is a promising technique that allows to increase the capacity and to make the upgrade of optical telecommunications systems already installed. In this work, the study and optimization of OFDM transmission in an optical communication system using direct detection with a short and medium range (metropolitan and regional networks) for a target bit rate of 10 Gbps will be performed exhaustively. The optimization is carried out taking into account the impact of noise accumulation and of signal distortion resulting from bandwidth narrowing introduced by the cascade of add-drop multiplexing nodes on the network performance. Optical transmission of single sideband OFDM signals is considered and the carrier-to-signal power ratio of the OFDM signal is optimized in order to achieve the best network performance.