Dependence of Differential Phase Detection Signals on Astigmatism in a Focused Spot
We have simulated the differential phase detection (DPD) signal characteristics in the presence of astigmatism in the focused spot of an optical pickup for a DVD player. Both DPD signals generated from four elements and two elements of a four-segment photo-diode have been simulated. The DPD signal l...
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Published in | Japanese Journal of Applied Physics Vol. 43; no. 7S; p. 4870 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
01.07.2004
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Online Access | Get full text |
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Summary: | We have simulated the differential phase detection (DPD) signal characteristics in the presence of astigmatism in the focused spot of an optical pickup for a DVD player. Both DPD signals generated from four elements and two elements of a four-segment photo-diode have been simulated. The DPD signal level and the offset level depend on the direction of astigmatism and the type of detection. In the two-element detection, astigmatism of 45 deg against the tangential direction of an optical disk deteriorates the DPD signal characteristics more severely than that of 0 deg along the tangential direction. |
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ISSN: | 0021-4922 1347-4065 |
DOI: | 10.1143/JJAP.43.4870 |