This is the lowest value recorded during the current performance-monitoring interval of the received optical power measured on the higher-numbered optical lane of this multi-lane coherent port during the current performance-monitoring interval. The lowest received power seen on this lane during the interval is the figure that matters most, since a dip here specific to this lane (while the other lane stays normal) points to a lane-specific fault such as a partially blocked optical path within the module. For example, if inOpticalPowerLaneHighMin drops sharply during one interval while the low lane's minimum stays flat, that asymmetry points an admin toward a lane-specific defect in the receiving module rather than the fiber.