This is the lowest value recorded during the current performance-monitoring interval of the transmitted optical power measured on the lower-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 outOpticalPowerLaneLowMin dips during a specific interval more than the high lane does, an admin might suspect a defect isolated to the low lane's laser or its drive circuitry.