Full-Duplex 20 Gbit/s Fiber-Optic Link Design Based on Dual-Polarization Differential Quaternary Phase-Shift Keying

Abstract

Low loss and ultra-high bandwidth available in optical domain has led to the shift from electrical signal processing such as modulation, bandwidth allotment etc. toward all optical processing. Implementing millimeter-wave (mm-wave) signals along with advanced modulation techniques to modulate the light has led to the development of technologies such as Radio over Fiber (RoF), Passive Optical Network (PON) and finds application in present and future broadband communication. In this paper a full-duplex 20 Gbit/s RoF system is presented for a transmission distance up to 100 km and overall system performance is studied in terms of Q-factor, Bit Error Rate (BER) and Error Vector Magnitude based on simulation platform. It is observed that the system maintains good performance in terms of coherency (i.e. single laser source) and spectral efficiency (bits/s/Hz) after transmission over Standard Single Mode Fiber (SSMF). Findings are useful to design high speed, lesser bandwidth, and cost-efficient optical communication system. The same can also be implemented in WDM system to get a much higher data rate of 320 Gbps for system using 16 channels.