Use of Grating in Reading Multilayer Discs to Reduce Amount of Interlayer Crosstalk

スポンサーリンク

概要

• 論文の詳細を見る

• Crosstalk from adjacent layers affects the tracking error signal of conventional optical pickups when a multilayered disc is read. The tracking error signal fluctuates and makes precise tracking difficult. We propose the use of a grating in the return path to reduce the amount of crosstalk. Using a grating with an uneven plane on the optical axis reduces the amount of stray light causing the crosstalk and allows the target light to pass through. We show that using a grating with an appropriate pitch prevents diffracted light higher than an order of $\pm 1$ from going back to detectors. As the shape and depth of the grating are important factors for the zeroth-order light, we chose a deep triangular grating. We measured the distribution of the transmitted intensity through the grating as a focused beam position was scanned and found that the grating can reduce the amount of crosstalk.

• 2009-03-25

著者

• Watanabe Koichi

  Storage Technology Research Center, Central Research Laboratory, Hitachi, Ltd., 292 Yoshida-cho, Totsuka-ku, Yokohama 244-0817, Japan

• Shintani Toshimichi

  Storage Device Research Department, Central Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan

• Kimura Shigeharu

  Storage Device Research Department, Central Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan

• Anzai Yumiko

  Storage Device Research Department, Central Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan

• Ide Tatsuro

  Storage Device Research Department, Central Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan

• Tatsu Eriko

  Storage Device Research Department, Central Research Laboratory, Hitachi, Ltd., Kokubunji, Tokyo 185-8601, Japan

関連論文

• Use of Grating in Reading Multilayer Discs to Reduce Amount of Interlayer Crosstalk
• High-Speed Write/Read Techniques for Blu-ray Write-Once Discs
• Recordable Multilayer Super-Resolution Optical Disc Realized Using Discrete-Track Three-Dimensional Pit Selection
• Enhancement of Speed Margins for $16\times$ Digital Versatile Disc-Random Access Memory
• One-Laser-Two-Beam Method for Double Overwrite Speed in Rewritable Phase-Change Optical Discs
• Sub-Terabyte-Data-Capacity Optical Discs Realized by Three-Dimensional Pit Selection
• Estimation of Feasibility for 100 Mbps High Data-Transfer Rate on an Optical Disk with High Areal Density Using Multilevel Recording

スポンサーリンク