This is the average value over the current performance-monitoring interval of the received optical power measured on the lower-numbered optical lane of this multi-lane coherent port during the current performance-monitoring interval. Averaging this lane's received power over the interval lets an admin see whether this lane is running at a materially different level than its sibling high lane, a sign of a lane-specific rather than port-wide issue. For example, an admin diagnosing a coherent module with one persistently noisier lane would compare inOpticalPowerLaneLowAvg against the high-lane average across several intervals to confirm the imbalance is consistent rather than a one-off blip.