Immediate OPC - a new proposal of optimum power calibration for DVD + R multisession recording

A new optimum power calibration (OPC) algorithm for optical storage recording is proposed in this paper to provide accurate write power and write strategy settings for multisession recordings. This new OPC proposal, called "immediate optical power calibration" (IOPC), utilizes buffer zone A located in the intro area of the appended sessions to execute the OPC so that the recording area is exactly at the location where the OPC is executed. This methodology is very different from the current OPC being specified in the DVD + R/RW Specification , in which the OPC is executed at either the innermost or outermost OPC areas of a disk and the interpolation method is used to obtain the predicted power for recording. Since the IOPC is executed at a location on the disk exactly where it is to be recorded, the optimal write power and the write strategy settings obtained through the IOPC can thus provide more accurate writing power to achieve better jitter performance for recording. Most important, the IOPC is strictly compliant to the industry standards specified in DVD + R/RW Specifications to assure the recorded disk employing IOPC can be read back universally.