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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Interlayer crosstalk reduction of a multilayer Blu-ray Disc using a grating in a three beam optical system
Tatsuro Ide1, Shigeharu Kimura, Eriko Tatsu
1Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan. tatsuro.ide.ps@hitachi.com
Applied Optics
|April 23, 2010
Summary
A novel optical pickup design significantly reduces interlayer crosstalk in multilayer optical discs. This innovation stabilizes tracking error signals, improving data readout stability for devices like triple-layer Blu-ray Discs.
Area of Science:
- Optoelectronics
- Optical Data Storage
Background:
- Multilayer optical discs suffer from interlayer crosstalk, where light reflected from out-of-focus layers causes tracking error signal fluctuations.
- This fluctuation leads to unstable readout signals, degrading data integrity in high-density storage media.
Purpose of the Study:
- To develop and experimentally validate a novel optical pickup design for suppressing interlayer crosstalk in multilayer optical discs.
- To stabilize the differential push-pull (DPP) signal, thereby improving the reliability of data readout.
Main Methods:
- A novel optical pickup incorporating a grating along the optical axis in the return path was developed.
- The pickup's performance was experimentally evaluated for its ability to suppress DPP signal fluctuation.
Main Results:
- DPP signal fluctuation was successfully suppressed from 6% to 2%, a reduction to one-third of the original level.
- Satisfactory readout jitters of approximately 8% were achieved for a triple-layer Blu-ray Disc (BD).
Conclusions:
- The developed optical pickup effectively reduces interlayer crosstalk in multilayer optical discs.
- The experimental results demonstrate the method's validity for enhancing signal stability and readout quality.
