High Density Optical Disk System Using Two-Dimensional Recording

Koichiro WAKABAYASHI  Hisataka SUGIYAMA  Atsushi SAITO  Takeshi MAEDA  

IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.11   pp.1582-1590
Publication Date: 1995/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Ultra High Density Information Storage Technologies)
lattice recording,  track pitch,  crosstalk,  inter-symbol interference,  two-dimensional equalizer,  coefficient training,  

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A two-dimensional recording method that achieves double recording density by reducing the track pitch is described. This method uses a flat disk and the data are recorded with circular marks on lattice points. Two-dimensional interference consisting of crosstalk and inter-symbol interference is reduced by two-dimensional equalization. To minimize the two-dimensional interference, the optimum equalization coefficients are calculated dynamically with the reproduced signal of the training marks. Reproduction was simulated and this showed that the signal-to-noise ratio of the processed signal was 24.3 dB under ideal conditions and 19.8 dB under worst-case conditions with the usual magneto-optical media using double recording density. These simulation results were checked by a recording/reproduction experiment. The experimental result for the signal-to-noise ratio of the processed signal was 23.6 dB with an areal density of 2.3 Gbit/in2.