This CoriantTypesOpticalPower value (default 1.0) sets the target transmit optical power the coherent optical channel (och-os) on the line side of a pluggable transceiver should output on the line side, supporting adjustable-power operation rather than a single fixed factory setting. An administrator tunes this to match the span loss budget of the specific fiber run, raising it for a longer or lossier span and lowering it to avoid overdriving a receiver on a short span. For example, an administrator provisioning och-os onto a long unamplified fiber span might raise this required power value to maintain adequate received power at the far end.