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Evaluation of partial-response maximum-likelihood detection for phase-change optical data storage.

C Peng1, M Mansuripur

  • 1Optical Sciences Center, The University of Arizona, Tucson, Arizona 85721, USA. cpeng@u.arizona.edu

Applied Optics
|March 8, 2008
PubMed
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Partial-response maximum-likelihood (PRML) detection enhances rewritable phase-change optical data storage. Jitter, not noise, limits ultrahigh density, indicating PRML

Area of Science:

  • Optical data storage technologies
  • Signal processing for data retrieval
  • Materials science for rewritable media

Background:

  • Rewritable phase-change optical data storage faces limitations in achieving ultrahigh densities.
  • Effective signal detection is crucial for reliable data retrieval from optical media.

Purpose of the Study:

  • To apply and evaluate partial-response maximum-likelihood (PRML) detection for rewritable phase-change optical data storage.
  • To identify the primary factors limiting data density in this storage medium.

Main Methods:

  • Software simulation of PRML detection applied to readout signals from optical disks.
  • Extraction of impulse response, PR equalization, gain adjustment, and clock recovery.
  • Maximum-likelihood sequence estimation using the Viterbi algorithm.

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  • Analysis of bit-error rate and noise characteristics at various linear densities (0.35, 0.31, and 0.2 microm/bit).

    • Main Results:

    • The PRML detection algorithm was successfully applied to simulated phase-change optical data storage signals.
    • Good eye patterns were observed, particularly at linear densities of 0.35 and 0.31 microm/bit.
    • Jitter was identified as the dominant obstacle to ultrahigh density, surpassing the impact of noise.
    • Nonlinear effects in phase-change readout were also noted as a contributing factor.

    Conclusions:

    • PRML detection is a viable method for improving data storage performance in rewritable phase-change media.
    • Minimizing jitter is critical for advancing towards ultrahigh densities in optical data storage.
    • Further research into mitigating nonlinear effects is warranted for future optical storage development.