Abstract:
Advanced modulation formats play an important role in systems performance carrying data at
100 Gb/s and more in optical networks. Each modulation format has advantages and
disadvantages compared to each other. Therefore, the aim of this project was to carry out a
comparative analysis of the performance of optical transmission systems at 100 Gb/s using
advanced modulation formats RZ-DQPSK (Differential Quadrature Return to Zero Phase
Shift Keying) and DP-QPSK (Dual Polarization Quadrature Phase Shift Keying). The basic
modulation format NRZ (Non-Return-To-Zero) at 100 Gb/s was also analyzed. The
simulation software VPItransmissionMaker™ was used to analyze the performance of each
system.
The results show that the 100 Gb/s DP-QPSK coherent systems are more robust to the
propagation effects than the others with reach values of 1,200 km and 880 km for single
channel and 4-channel WDM simulations, respectively. As for the 100 Gb/s RZ-DQPSK
system, it seems to better resist to the propagation effects than the 100 Gb/s NRZ system
with reach values of 1,000 km and 720 km for single channel simulations. Further analysis of
4-channel 100 Gb/s WDM NRZ and RZ-DQPSK systems must be carried out as the
simulated reach values are significantly lower to the single-channel results.
