Impact of PMD induced penalties on 40 Gb/s duobinary optical communication system for fixed and variable scattering section dispersion

In this paper, we evaluate the performance of 40 Gb/s duobianry optical transmitter for different scattering section dispersion and polarization-mode dispersion coefficient of single mode fiber. We observe that the variable scattering section dispersion considerably improves the performance of duobinary optical system as compared to fixed scattering section dispersion where the Q value fluctuates over wide frequency range. Also, duobinary system observes pulse delay of 7 ps for the fixed scattering section dispersion while there is no delay in the received output signal if variable scattering section dispersion is considered.