"Multi-Dimensional Modulation Coding for Page-Oriented Optical Data Storage Systems"

by Dhawat "Eddie" Pansatiankul

May 2002

We present several two-dimensional (2-D) mathematical models for various two-photon PODS systems. Using these 2-D models, we describe the nature of intersymbol interference (ISI) in two-photon PODS systems and find that its characteristics are different from ISI in conventional data storage systems. To overcome the inherent ISI in two-photon PODS systems, we present a novel 2-D modulation coding scheme. We also present a number of fixed-length and variable-length 2-D modulation codes with diverse properties based on our 2-D modulation coding scheme. The bit-error-rate (BER) performance of these 2-D modulation codes is investigated and compared.

In addition to the ISI, the interpage interference (IPI) may also be significant in two-photon PODS systems. We present many three- dimensional (3-D) mathematical models for a variety of two-photon PODS systems to examine IPI and its effects. In order to overcome the effects of ISI and the effects of IPI in two-photon PODS systems simultaneously, we present a new 3-D modulation coding scheme that is an extension of our 2-D modulation coding scheme. Examples of 3-D modulation codes derived from our 3-D modulation coding scheme are also presented. Finally, we discuss techniques to encode and extract clock information in two-photon PODS systems.

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