Super Monitor Design for Fast Link Failure Localization in All-Optical Networks
An m-cycle is an optical loop-back pre-cross connection of a supervisory wavelength. In a cycle-based link failure detection scheme, a monitor transmits supervisory signals onto the m-cycle, receives them back, and compares with the one sent for fault detection. In this paper, the authors propose the notion of super monitor for cutting down the hardware cost of monitors. Instead of having a dedicated monitor for each m-cycle, a super monitor is placed at the junction of a set of m-cycles. Supervisory signals from a single laser source are split simultaneously onto multiple m-cycles using an optical splitter. As the cost of a monitor is usually dominated by the laser, co-locating conventional monitors to form a super monitor for cost reduction makes sense.