Title :
Analysis of DPD signal offset caused by optical asymmetry
Author :
Seong-Yun Jeong ; Jung-Bae Kim ; Jin-Yong Kim
Author_Institution :
Multi-Media Lab., LG Electron. Inc., Seoul, South Korea
Abstract :
Differential Phase Detection (DPD) method is now widely used for tracking error generation in DVD players. DPD is known to be relatively immune to the optical asymmetry, but in reality DPD offset results from the lens shift or disc tilt. To achieve a stable tracking servo property, it is necessary to reduce this DPD offset. In this paper, we suggest a simple model to clearly show the causes of DPD offset. The validity of this model is supported by intensive computer simulation which uses vectorial diffraction theory. Some experimental results are compared with calculation and discussed.
Keywords :
light diffraction; optical disc storage; optical information processing; optical tracking; simulation; video discs; DVD players; computer simulation; differential phase detection signal offset; disc tilt; embossed pit structure; lens shift; model; optical asymmetry; optical head; phase difference calculation; stable tracking servo property; tracking error generation; vectorial diffraction theory; Computer simulation; DVD; Diffraction; Laboratories; Laser beams; Lenses; Optical polarization; Phase detection; Servomechanisms; Signal analysis;
Conference_Titel :
Optical Data Storage Topical Meeting, 1997. ODS. Conference Digest
Conference_Location :
Tucson, AZ, USA
Print_ISBN :
0-7803-3885-5
DOI :
10.1109/ODS.1997.603901
