Optical Disc Recording At 50 Megabits/Second

C. W. Reno; R. J. Tarzaiski

doi:10.1117/12.957256

10 July 1979 Optical Disc Recording At 50 Megabits/Second

C. W. Reno, R. J. Tarzaiski

Proceedings Volume 0177, Optical Information Storage; (1979) https://doi.org/10.1117/12.957256
Event: Technical Symposium East, 1979, Washington, D.C., United States

Abstract

An optical disc system is being developed to address wideband archival digital data storage applications. This system, which has the capability for "instant" playback (i.e., within a few bit periods), is configured about an RCA-proprietary "trilayer" optical disc structure. The optical disc has the potential for achieving high packing density (1011 bits/disc) and high data transfer rates. This paper discusses the RCA approach and experimental results of the implementation of an error detection and correction (EDAC) scheme and of a 50 Mb/s delay modulation encoding channel. The EDAC has been simulated using a computer program with raw data obtained from a readout of an optical disc at 40 Mb/s. The codes employed are described. The EDAC chosen gives about 100-to-1 improvement in error rates for 10 percent overhead. The 50 Mb/s delay modulation (DM) channel implementation will be described. Waveforms for the encoding and decoding signals are shown, along with a description of the logic circuitry used. Approaches for interfacing the encode/decode circuitry with external data equipment are also considered. The discussion of the DM channel includes a description of the synchronization and data identification signals and the manner in which they are serialized and inserted into the data stream.

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C. W. Reno and R. J. Tarzaiski "Optical Disc Recording At 50 Megabits/Second", Proc. SPIE 0177, Optical Information Storage, (10 July 1979); https://doi.org/10.1117/12.957256

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