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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 20 — Jul. 10, 1999
  • pp: 4394–4405

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

Chubing Peng and M. Mansuripur  »View Author Affiliations


Applied Optics, Vol. 38, Issue 20, pp. 4394-4405 (1999)
http://dx.doi.org/10.1364/AO.38.004394


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Abstract

We describe the application of partial-response (PR) maximum-likelihood (ML) detection in rewritable phase-change optical data storage. The input to this detector, which is simulated in software, is the actual signal (without any equalization), reproduced from reading of the recorded sequence on an optical disk. The detection algorithm involves the extraction of the impulse response from the readout signal, PR equalization, the adjustment of gain and recovery of clock, ML sequence estimation with the Viterbi algorithm, and analysis of PRML performance. With a laser wavelength of 0.69 µm and an objective lens with a numerical aperture of 0.6, three linear densities are examined: 0.35 and 0.31 µm/bit without modulation code and 0.2 µm/bit with the (1, 7) modulation code. The equalized signal exhibits good eye patterns, especially at the densities of 0.35 and 0.31 µm/bit. Analyses of noise and bit-error rate indicate that jitter, rather than noise, is the main obstacle to realizing ultrahigh density in phase-change media with PRML detection. We also briefly discuss the problem of the inherent nonlinear effect in phase-change readout.

© 1999 Optical Society of America

OCIS Codes
(210.0210) Optical data storage : Optical data storage
(210.4590) Optical data storage : Optical disks
(210.4770) Optical data storage : Optical recording

History
Original Manuscript: December 6, 1998
Revised Manuscript: March 19, 1999
Published: July 10, 1999

Citation
Chubing Peng and M. Mansuripur, "Evaluation of partial-response maximum-likelihood detection for phase-change optical data storage," Appl. Opt. 38, 4394-4405 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-20-4394


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