Single-fiber bidirectional transmission： Supports 2-channel Drop/Add services over a single fiber, optimizing scarce fiber resources. Low insertion loss： ≤1.5dB for wave-to-line, ≤2.4dB for west-east/east-west transmission, ensuring efficient signal propagation. High isolation： ≥30dB adjacent channel isolation and ≥45dB non-adjacent isolation, minimizing crosstalk. Wide temperature tolerance： Operates/stores between -40°C to 85°C, suitable for extreme environmental conditions. Modular deployment： FMU plug-in module compatible with 2-slot 1U rack or LGX BOX for flexible installation.