Write Strategy Optimization Method with Two-Step Search for Blu-ray Disc Recording

Abstract

A new write strategy (WS) optimization method with a two-step search process for Blu-ray Disc (BD) recording is developed to shorten the optimization time. This method is realized by the WS optimization system, which is constructed with an optical pickup, a disc tester, and the WS optimization algorithm. The optimization is executed according to the two-step search process along the mathematical axis, which is experimentally derived from the sample WS parameters. As the experimental result, the optimization time is reduced by nearly two-thirds from that achieved using the conventional method performed by the experts. All the jitter values of the playback signal derived from the recorded marks are smaller than the 7% target value and the effectiveness of this new method is experimentally confirmed.

Simplified Transfer Function of Write Compensation for Phase-Change Optical Disks

“…Several write compensation methods have been proposed for the mark formation of phase-change optical disks experimentally. [6][7][8][9][10][11][12][13][14][15][16] These studies could deal with the recording process of the phase-change optical disk using realistic methods; however, they did not directly give the relationship between write compensation and thermal characteristics in an arbitrary phase-change optical disk. The dynamic temperature distribution in an optical disk when an optical beam passed over the optical disk was studied analytically and numerically.…”

Real-Time Write Strategy Optimization Method for Optical Discs

“…[1][2][3][4][5][6][7][8] Write strategy optimization methods to realize stable optical disc recording have been actively investigated. [9][10][11][12][13][14][15][16][17][18][19][20][21] The optical disc drives usually determine the write strategy for a disc at the start of the recording operation and subsequently use the determined write strategy until the recording operation is completed. On the other hand, some commercial discs already released into the market have a variety of recording characteristics depending on the recording position in the radial direction.…”