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Optical Engineering

Signal, Noise, And Codes In Optical Memories
Author(s): David Treves; Dan S. Bloomberg
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Paper Abstract

An analysis is given of the effect of additive and multiplicative noise in the data and servo channels of both write-once and magneto-optic recording systems. Electronic (additive) noise is most severe in the magneto-optic data channel, and laser noise is of particular concern in both the sum tracking channel and the write-once data channel. In a typical optical memory system, the maximum laser light fluctuation should never exceed 10% of the average light level. In the differential channel of such a system, the laser noise should be further reduced by another order of magnitude. In the data channel, nonreturn-to-zero (NRZ) encoding has the greatest immunity to noise. Analysis is made of the extent to which the S/N margin is lost when various run-length-limited codes are used, for both additive and multiplicative noise.

Paper Details

Date Published: 1 July 1986
PDF: 11 pages
Opt. Eng. 25(7) doi: 10.1117/12.7973924
Published in: Optical Engineering Volume 25, Issue 7
Show Author Affiliations
David Treves, Weizmann Institute of Science (Israel)
Dan S. Bloomberg, Xerox Corporation (United States)

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