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Proceedings Paper

Wideband Optical Disc Data Recorder Systems
Author(s): G. J. Ammon
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Paper Abstract

This paper describes a wideband optical disc, digital recorder/playback system, the disc itself, test results, applications and future improvements. Recording is accomplished with a modulated laser beam, positioned on the disc by a track mirror and a focus lens. Playback is done at a reduced constant light level. A servo maintains precision focus of the laser spot on the microscopically uneven disc surface. Fine tracking is obtained by a dither track servo. A trilayer antireflection disc structure provides high optical and thermal efficiency, very high sensitivity and signal to noise ratio, and has the potential for low fabrication cost. Record/playback data rates of 50 Mb/s and data densities of 1011 bits per disc side have been demonstrated. Optical disc configurations have been developed for three applications: a 400 Mb/s recorder/reproducer (using eight 50 Mb/s channels), and a 1013 bit jukebox reader, and a 1014 bit mass memory system (with a 3-second access time to any data record). Future systems will use laser diodes for both record and playback, allowing more compact designs with greater reliability and lower cost.

Paper Details

Date Published: 12 February 1980
PDF: 9 pages
Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980); doi: 10.1117/12.958069
Show Author Affiliations
G. J. Ammon, RCA Advanced Technology Laboratories (United States)

Published in SPIE Proceedings Vol. 0200:
Laser Recording and Information Handling
Albert A. Jamberdino, Editor(s)

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