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12 February 1980 Wideband Optical Disc Data Recorder Systems
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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.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. J. Ammon "Wideband Optical Disc Data Recorder Systems", Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980);

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