Mitigation of nonlinear responses in POLMUX-based long-haul optical communication system with the duo-binary modulation scheme.

A polarization multiplexing-based long-haul optical communication system using the duo-binary modulation technique is proposed and analysed using numerical simulations. The combination of cascaded dispersion compensation fiber (DCF) and single mode fiber (SMF) is used in the proposed system which effectively minimizes the signal distortion and improves the bit error rate (BER) value and the quality factor (Q-factor) obtained, which indicates the capability of a system to differentiate between the logical 1's and 0's in the receiver section. The system can effectively transmit 10 Gbps data over 120 km SMF along with 24 km DCF as well as 800 m free space optical (FSO) distance for an input power of 10 dBm. The obtained minimum BER value of 3.84 × 10− 10 and the Q-factor of 6.29 proves the efficiency of the system. The obtained results confirm that the nonlinear distortions arising due to increasing the input power are significantly reduced and the optimized result is obtained for 10 dBm input power. The variation of the Q-factor with the effective area of the fiber is also investigated. The achieved BER value of 1.67 × 10− 9 for transmission of 20 Gbps data over a distance of 70 km SMF + 14 km DCF + 800 m FSO proves that the system can be used to transmit high data rate in long-range communication. [ABSTRACT FROM AUTHOR]