The Performance Investigation of Direct Detection Optical OFDM System with Different Modulation Formats

Optical orthogonal frequency division multiplexing (OOFDM) has been shown to be able to resist channel dispersion (CD) and polarization mode dispersion (PMD) and it is considered as a promising long distance optical transmission technology. Direct detection optical OFDM (DDO-OFDM) system is a low-cost system and insensitivity to laser phase noise. In this paper, Optisystem and MATLAB are used to jointly build a DDO-OFDM system, and the transmission performance of CO-OFDM based on M-QAM is studied. Through the simulation, we find that in M-QAM-OOFDM system, with the increase of M, the signal is more sensitive to noise, so in general, we use 16QAM to realize signal transmission.