The variation of read-out signal in an optical disc system having the amplitude modulated apodizer

The most straightforward methods to increase the density of an optical disc are to use a shorter wavelength laser diode, to increase the numerical aperture of the objective lens, and to use an apodizer. Especially, the apodizer causes the diffraction image formed on the disc to be smaller and the re...

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Published inTechnical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464) Vol. 2; pp. 555 - 556 vol.2
Main Authors Seong Jong Park, Young Chol Lee, Sang Hyun Sim, Chang Sub Chung
Format Conference Proceeding
LanguageEnglish
Published IEEE 1999
Subjects
Amplitude modulation
Apertures
Diode lasers
Lenses
Optical diffraction
Optical modulation
Optical reflection
Optimized production technology
Physics
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Summary:The most straightforward methods to increase the density of an optical disc are to use a shorter wavelength laser diode, to increase the numerical aperture of the objective lens, and to use an apodizer. Especially, the apodizer causes the diffraction image formed on the disc to be smaller and the read-out signal to increase. In the paper we investigate numerically the variation of read-out signal in an optical disc system with the amplitude modulated apodizer, using a scalar diffraction theory. The considered apodizers are the truncated Gaussian apodizers, the shaded apodizers, and the central obstruction apodizers.
ISBN:9780780356610
0780356616
DOI:10.1109/CLEOPR.1999.811567