This is the lowest value recorded during 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. The lowest received power seen on this lane during the interval matters most, since a dip specific to this lane points to a fault isolated to its optical path inside the module. For example, if inOpticalPowerLaneLowMin dips during the same intervals every day, an admin might correlate that pattern with a scheduled process elsewhere on the shelf that happens to affect only this lane.