Research on Dispersion Compensation of 40 GB/s Optical Duo Binary Coded Transmission System
A 40 Gb/s high speed optical transmission system is designed, and the different dispersion compensation schemes are adopted to realize the transmission of the optical duo binary (ODB) signals over 120 km optical fiber. Optical duo binary signals are generated by using a precoder, two low pass filters (LPF) and one mach zehnder modulator (MZM) Through combination of dispersion compensation fiber (DCF) and single mode fiber (SMF) in the transmission link, four different dispersion compensation schemes (pre compensation, post compensation and hybrid compensation (pre+ post) and hybrid compensation (post+ pre) were compared. Analyzing Q factor, BER, eye diagrams and receiver sensitivity in several dispersion compensation schemes, the simulation results are: the cut off frequency of LPF affects the transmission performance, and the hybrid compensation (post+ pre) scheme is the optimal dispersion compensation method.