Patent ID: 7995441

Claim:
An optical recording drive adapted for recording data on an associated optical carrier, the optical recording drive comprising: a radiation source capable of emitting a radiation beam, said beam being adapted to write information on the optical carrier as optically detectable effects, a write strategy generator capable of providing the radiation source with a write strategy for an optically detectable effect, the radiation source being arranged to emit a corresponding write pulse train for writing the optically detectable effect, said write pulse train comprising at least an upper and a lower level of power, photo detection means arranged to detect reflected radiation from the optical carrier, said photo detection means being capable of detecting a first reflected radiation beam pulse (R 1 ) from a start time portion of the write pulse train and generating a corresponding first signal (PS 1 ) indicative of the power in the first pulse, the photo detection means further being capable of detecting a second reflected radiation pulse (R 2 ) from an end time portion of the write pulse train and generating a corresponding second signal (PS 2 ) indicative of the power in the second pulse, and processing means for comparing said first signal (PS 1 ) and said second signal (PS 2 ) so as to obtain an indication of the received power in the optically detectable effect as delivered by a power level in the write pulse train wherein the processing means is adapted to obtain an indication of the received power in the optically detectable effect as delivered by a power level in the write pulse train by utilizing the time difference of said first signal (PS 1 ) and said second signal (PS 2 ).