Ledraa, AbderahmaneZitouni, Abdelkader2023-09-142023-09-142021https://dspace.univ-boumerdes.dz/handle/123456789/1202753 p.The aim of this work is to do a qualitative study by simulation two different advanced high-order modulation schemes: 8PSK and 8QAM in modern optical fiber communication system, and show the effects of the input power and fiber length at three-bit rates level: 15, 30 and 54 Gbps. The performance of the optical fiber link in terms of constellation diagram for the four modulation schemes is compared and discussed.enOptical CommunicationSimulation Study of High-OrderThesis