Paper
28 June 1999 An optical head with coaxial dual-beam cross talk canceller
Kenichi Kasazumi, Kazuhisa Yamamoto, Makoto Kato
Author Affiliations +
Abstract
A type of optical head with crosstalk canceller (CTC)[1] investigated so far increased considerably the storage density of the optical disks. This type of the CTC, however, required off-axis beams to detect signals from adjacent tracks, and also additional electronics to compensate for time delay between the main-beam and the sub-beams. Such beam separation caused the system unstable, because the delay time fluctuates due to the change in the wavelength, and also because the decentering of the disk resulted radial positioning error of sub-beams. To overcome these problems, we have proposed a new typed crosstalk canceller using coaxial dual beams which are orthogonally polarized[2.] In this paper, we demonstrate a practical configuration of an optical head with the CTC, and some experimental results with play back characteristics.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenichi Kasazumi, Kazuhisa Yamamoto, and Makoto Kato "An optical head with coaxial dual-beam cross talk canceller", Proc. SPIE 3864, Joint International Symposium on Optical Memory and Optical Data Storage 1999, 38640D (28 June 1999); https://doi.org/10.1117/12.997599
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KEYWORDS
Head

Optical discs

Objectives

Signal detection

Beam splitters

Diffraction

Optical storage

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