This read-only CoriantTypesOpticalPower value (default -99.0, indicating no valid reading) reports the actual measured transmit optical power currently being output on the line side of the coherent optical channel (och-os) on the line side of a pluggable transceiver. An administrator compares this live reading against the configured required power to confirm the transceiver is actually producing the requested power level, since a failing laser would show up here as a value well below the target. For example, seeing the actual power on och-os drop significantly below its required setpoint would point a technician toward a failing or end-of-life laser in the pluggable module.