An Optical Bypass Module is a passive or active optical device designed to maintain signal continuity in a network node when a network element, such as a transponder, router, or switch, fails or is powered off. OBMs are primarily used in optical line protection (OLP) systems, where they. The x-Light, a fiber optic bypass, is a technological solution used in fiber optic networks to improve redundancy and reliability. The goal is to reroute network traffic in the event of failures, preserving connectivity.