This is the lowest value recorded during the current performance-monitoring interval of the transmitted optical power measured on the higher-numbered optical lane of this multi-lane coherent port during the current performance-monitoring interval. The lowest transmit power seen on this lane during the interval is the figure that matters most, since a dip here specific to this lane could be starving the corresponding lane at the far-end receiver. For example, if outOpticalPowerLaneHighMin dips during the hottest part of the day more than the low lane does, an admin might suspect uneven thermal loading affecting just the high lane's laser.