Time-interval quantization in a high-density optical data storage system
AuthorTehranchi, Babak, 1968-
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PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractA hardware system for investigating Intersymbol Interference (ISI) in an optical data storage system has been designed and constructed by the author. The system consists of a pattern generator which produces data patterns of variable lengths and bit rates to be recorded on the optical disk. Data marks of the readback signal are quantized by a light-speed clock-counter system, and transferred in parallel to a personal computer for analysis. SNR values for collected data are obtained by computing mark size deviations of the readback signal from the original marks. A pseudo-random pattern of 31 bits is used for calculating SNR values for different spot sizes. Finally, Additive Interleaving Detection (AID) technique is implemented to compute another set of SNR values. 3-5db SNR improvement is observed when AID technique is used.