128-QAM dual-polarization chaotic long-haul system performance evaluation

Abstract

Abstract In this research work, performance of 128-quadrature amplitude modulation (QAM) modulation format along with dual polarization is investigated for long-haul communication in chaotic environment at data rate of 112 Gb/s and different fiber lengths. The prime objective of this work is the merger of QAM modulation scheme and optical chaos to acquire higher effective data rate with secure optical communication. The property of semiconductor laser for producing high bandwidth chaos is utilized to encrypt high data rate supported by 128-QAM signal. Chaos produced in this way is then applied to two states i.e., x and y-polarization of signal, at the same time to study results individually through constellation diagrams. The proposed model consisting of 128-QAM transmitter and receiver design, incorporating chaos is tested to investigate and combat the effects of different transmission impairments such as attenuation, dispersion, inline amplifiers effects, and message retrieval.