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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 7,
  • Issue 5,
  • pp. 424-427
  • (2009)

Analysis of differential phase detection signal of a novel multi-level read-only disc

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Abstract

To improve the tracking servo performance, a novel signal waveform multi-level (SWML) read-only disc realized on the digital versatile disc (DVD) platform is presented. The characteristic of the differential phase detection (DPD) signal of the SWML read-only disc is analyzed both in theory and experiment. The amplitude of the DPD signal of the SWML read-only disc in an open tracking servo loop is about 2/3 of that of the DVD read-only disc. The uniformity and symmetry of the DPD signal of the SWML read-only disc are similar to those of the DVD read-only disc and better than the former multi-level run-length limited (ML-RLL) read-only disc.

© 2009 Chinese Optics Letters

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