Volume holographic memory (VHM) systems are page-oriented optical data storage systems with a relatively large storage capacity, a high aggregate data transfer rate, and a fast access time as compared with other conventional mass data storage systems. In addition to the noise sources commonly present in a conventional communication channel, the VHM systems use a two-dimensional (2-D) data format and therefore suffers from 2-D electrical/optical hybrid noises. In this dissertation, we apply digital communication coding techniques to such a page-oriented optical memory system. To establish a coding performance baseline, we take an information theoretical perspective to study the design of 4F optical imaging systems, and the storage capacity of page-wise accessed VHM systems. In addition to the information-based figure of merit, bit-error rate (BER) serves as a more practical data fidelity measure. A BER-based optical design and a constant BER recording schedule in VHM systems are shown to support the coding analyses based on the BER metric. We analyze the VHM storage capacity while applying Reed-Solomon error-correction coding (ECC) and demonstrate that the use of the 2-D interleaving together with ECC results in a significant capacity improvement in the presence of systematic errors. In addition, soft-decision iterative decoding affords us a 2-D parallel decoding scheme that unifies the 2-D page equalization and decoding. A highly parallel decoder is discussed in the context of the 2-D low-pass channel mitigation and error correction. In the last part of this dissertation, we consider hardware implementation issues in 2-D optical systems. We design two coding related components using the MOSIS Orbit 2 mum n-well process to fabricate two CMOS VLSI chips. Power consumption and aerial scaling laws are discussed for each applications.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/283998 |
| Date | January 1999 |
| Creators | Chou, Wu-chun |
| Contributors | Neifeld, Mark A. |
| Publisher | The University of Arizona. |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Dissertation-Reproduction (electronic) |
| Rights | Copyright © 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. |
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