Fiber Fault Management and Protection Solution for Ring-and-Spur WDM/TDM Long-Reach PON
In this paper, a network fault management and protection system for the ring-and-spur Long-Reach Passive Optical Network (LR-PON) is proposed. The authors exploit an adapted, enhanced performance, and inexpensive passive optical components in the field and electronic switches in the Central Office (CO). Their system allows detecting and localizing not only faulty segments but also faulty nodes, hence alleviating the false alarm probability encountered in previous systems. They show that using ring duplication protection in LR-PON can save half the cost compared to full duplication protection with relatively high reliability performance (99.972%).