12 February 1980 Wideband Optical Disc Data Recorder Systems
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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.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. J. Ammon, G. J. Ammon, } "Wideband Optical Disc Data Recorder Systems", Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980); doi: 10.1117/12.958069; https://doi.org/10.1117/12.958069
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