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Proceedings Paper

Maximization Of Recording Density Obtainable In Te-Alloys
Author(s): Kees A. Schouhamer Immink; Ronald M. Aarts
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Paper Abstract

We report on high density recording experiments of digital information in Te alloys on pregrooved discs. The recording and reading of information is done on a recorder fitted with an AlGaAs laser. We describe experiments with modulation systems using pit-length modulation based on runlength-limited codes. Runlength-limited sequences were adopted as a modulator output because of the fact that this class of restricted sequences has a great impact in magnetic and optical recording. State-of-the-art high power solid-state lasers can emit a light pulse of sufficient energy for only a limited time and can therefore only be used in a pulsed mode. Pit-length modulation is achieved by adjusting the rotational velocity of the disc and laser pulse write frequency in such a way that oblong pits of overlapping monoholes result. We demonstrate the feasibility of recording densities of up to 1 Mbit/mm2 with the application of pit-length modulation schemes.

Paper Details

Date Published: 26 October 1983
PDF: 8 pages
Proc. SPIE 0396, Advances in Laser Scanning and Recording, (26 October 1983); doi: 10.1117/12.935268
Show Author Affiliations
Kees A. Schouhamer Immink, Philips Research Laboratories (The Netherlands)
Ronald M. Aarts, Philips Research Laboratories (The Netherlands)

Published in SPIE Proceedings Vol. 0396:
Advances in Laser Scanning and Recording
Leo Beiser, Editor(s)

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