Time-, Wavelength-, and Code-Domain Optical Reflection Monitoring for Next-Generation Access-Metro Networks
Distributed optical reflectors are proposed to implement essential fault management operations such as fault detection, localization, and notification, in next generation all-optical access-metro networks in the optical layer. Fixed time-slots, wavelengths, or optical codes are assigned to selected key network locations along the path of a monitoring signal where corresponding mirrors are placed. The reflection received at a transmitting node enables online all-optical monitoring of the selected locations. After detailing the network architecture, the authors explore fundamental system design issues such as real-time fault localization algorithms, fault notification delay upper-bounds, and delay line calculation algorithms for synchronous operation.