Partial-Response Maximum-Likelihood Detection Method for Magneto-Optical Recording

We detected bits sized at 0.237 µm bit length and 0.85 µm track pitch recorded by magnetic field modulation on a magneto-optical disk with a 690-nm laser diode and 0.60-numerical-aperture-objective using a partial-response maximum-likelihood detection method. We confirmed that the optimum partial-re...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1997, Vol.36 (1B), p.549-556, Article 549
Main Authors: NARAHARA, T, ARATANI, K, FUKUMOTO, A, MASUHARA, S
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Magnetic and optical mass memories
Storage and reproduction of information
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Summary:We detected bits sized at 0.237 µm bit length and 0.85 µm track pitch recorded by magnetic field modulation on a magneto-optical disk with a 690-nm laser diode and 0.60-numerical-aperture-objective using a partial-response maximum-likelihood detection method. We confirmed that the optimum partial-response for this high linear density had four coefficients of 1 by analyzing difference metrics of error critical paths. The recorded bits with areal density of 5.6 bit/µm 2 were also detected at a low error rate, which combination is 0.237-µm bit length and 0.75-µm track pitch. Its write power tolerance is limited to ±22%.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.36.549