String destTpId = link.getDestTpid();
OtsPmHolder srcOtsPmHoler = getPmMeasurements(sourceNodeId, sourceTpId, "OpticalPowerOutput");
OtsPmHolder destOtsPmHoler = getPmMeasurements(destNodeId, destTpId, "OpticalPowerInput");
String destTpId = link.getDestTpid();
OtsPmHolder srcOtsPmHoler = getPmMeasurements(sourceNodeId, sourceTpId, "OpticalPowerOutput");
OtsPmHolder destOtsPmHoler = getPmMeasurements(destNodeId, destTpId, "OpticalPowerInput");