Design of 16 × 100 Gbps free-space optical system using advanced modulation techniques

In this paper, advanced modulation techniques based on external modulation, such as I-AMI, AMI, and DBRZ, are designed to improve long-haul transmission and lower high power requirements in the FSO communication system. For long-haul 16 × 100 Gbps FSO systems, an alternate mark inversion modulation approach with high-data rate distortion less transmission is possible. The results demonstrate improved performance in terms of performance indicators such as Q-factor (29.62) and BER (3.8e −193 ), as well as improved data transmission capabilities of up to 100 Gbps over a distance of 9 km in clear weather. Because here, AMI technique uses a low input power of 5 dBm instead of a conventional power of 10 dBm, the achieved findings demonstrate a reasonable reduction in signal degradation, especially nonlinear effects.