Performance evaluation of N × 80 Gb/s DWDM optical system over SSMF for CSRZ-DPSK and RZ-DPSK signals with optimized alternate polarization

In this paper, the performance of N×80 Gb/s Dense Wavelength Division Multiplexed (DWDM) optical system is evaluated. Improved performance has been reported for CSRZ-DPSK signal with optimized alternate polarization (al-P), over 3120 km of SSMF using 80-km amplified spans in comparison to al-P RZ-DPSK. Investigations were conducted at 0.8 nm and 0.64 nm channel spacing. The results show that the CSRZ-DPSK signal with optimized al-P offers excellent performance for lower line width lasers. Orthogonal polarization and narrow spectrum of CSRZ-DPSK offer 5 dB improvement in quality factor for high-input power per channel with consistent performance over wider line widths. © 2015 by De Gruyter.