Abstract
High-speed rotation of the disk in optical driver always causes disk tilt, and then produces aberration. Aberration due to disk tilt would affect the intensity of the laser beam on the disk, and reduce the quality of the readout signal. From the specification of the DVD, the effect of small disk tilt still could be endured. However, as the storage density increases, this effect should be taken into consideration in order to improve the signal quality. This thesis will concentrate on the influences due to disk tilt on the high-frequency readout signal in DVD optical driver. Several optical theories used to analyze such deviations and to establish the mathematical model of the optical pickup will be studied. Then the model of the overall optical driver system in reading the data from the disk would be constructed. The variation of HF signal with period from 3T to 11T and 14T is simulated and examined under different disk tilt angles. Finally, the HF signal affected by disk tilt will be compensated by modifying the power of the laser diode. All simulations within this thesis are based on the mathematical model and the MATLAB software.