Jpn. J. Appl. Phys. 38 (1999) pp. 1715-1719  |Next Article|  |Table of Contents|
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New Equalizer to Improve Signal-to-Noise Ratio

Shogo Miyanabe, Hiroki Kuribayashi and KaoruYamamoto

Corporate Research and Development Laboratories, Pioneer Electronic Corporation, 6-1-1 Fujimi, Tsurugashima-Shi, Saitama 350-2288, Japan

(Received September 30, 1998; accepted for publication November 25, 1998)

Signal-to-noise ratio (SNR) of an optical memory disc deteriorates as the recording density increases. The authors have coped with this problem and developed a new equalizer which can improve the SNR by boosting higher frequency components on the readout signal without increasing the inter-symbol interference (ISI). The authors measured the jitter values on a prototype disc applying the new equalizer. The disc had a capacity of 15 Gbytes, a track pitch of 0.37 µm and a minimum pit length of 0.25 µm. An optical head with a second harmonic generation (SHG) blue laser with a wavelength of 430 nm and an objective lens with a NA of 0.6 was used. As a result, it was confirmed that the new equalizer could improve not only the SNR but also the tilt margins. Furthermore, the correlation between the jitter and the bit error rate observed on a conventional equalizer was found unchanged even with the new equalizer.

DOI: 10.1143/JJAP.38.1715
KEYWORDS:optical memory disc, DVD, blue laser, equalizer, FIR filter, inter-symbol interference, signal-to-noise ratio

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References | Citing Articles (23)

  1. F. Yokogawa, S. Ohsawa, T. Iida, Y. Araki, K. Yamamoto and Y. Moriyama: Jpn. J. Appl. Phys. 37 (1998) 2176[JSAP].
  2. H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara and K. Yamamoto: Magneto-Optical Recording Int. Symp./Int. Symp. Optical Memory'97 Tec. Dig.
  3. T. Higuchi, Y. Okumura and T. Iida: Jpn. J. Appl. Phys. 37 (1998) 2130[JSAP].

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