Advanced Reliability Enhancement Techniques in Free-Space Optical Communication Systems: A Review of WDM, QAM, PDM, OAM, and Hybrid RF/FSO Architectures
Free-space optical (FSO) communication is an attractive candidate for high-capacity terrestrial backhaul, fronthaul, last-mile access, high-altitude-platform, unmannedaerial-vehicle and satellite feeder links because it offers fiber-like optical bandwidth without laying fiber. The same narrow optical beam that enables...