Optical Review
Print ISSN : 1340-6000
ISSN-L : 1340-6000
Optimization of Mark Edge Recording Waveform for a Phase Change Rewritable Optical Disk Using a 680 nm Laser Diode
Takashi ISHIDAMamoru SHOJIYoshiyuki MIYABATAYasumasa SHIBATAEiji OHNOShunji OHARA
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1994 年 1 巻 2 号 p. 183-187

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A high density mark edge recording method on a phase change rewritable disk is reported. A carrier-to-noise ratio of 55 dB for a mark length of 0.55 μm is obtained by using a 680 nm, NA 0.6 head and a phase change rewritable disk. In mark edge recording, it is necessary to record each mark in correct length. A new laser power modulation pattern is proposed. This pattern consists of a first-pulse, a multi-pulse chain and a last-pulse. Both positions of the first-pulse and the last-pulse are movable. By adjusting these positions, a jitter, σ/Tw (Tw is window margin), is improved to 6.5% in high density EFM (Eight to Fourteen Modulation) recording of 0.4 μm/bit.
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© 1994 by the Optical Society of Japan
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