KEYWORDS: Servomechanisms, Signal processing, Signal detection, Optical tracking, Sensors, Clocks, Stereolithography, Detection and tracking algorithms, Photodetectors, Modulation transfer functions
Differential phase detection (DPD) is the most popular tracking error detection method for read-only optical discs (ROM
discs). However, DPD tracking-error signals deteriorate for high-density discs such as over 30-GB Blu-ray discs (BDs)
where zero-cross detection becomes inaccurate. To solve this problem, we propose a new zero-cross-detection-free DPD
(ZF-DPD) method by applying the least-mean-square (LMS) algorithm adaptive equalizer. We experimentally confirmed
its effectiveness for a high-density (33.3 GB/layer) four-layer BD-ROM disc.
KEYWORDS: Optical discs, Optical storage, Tolerancing, Signal processing, Signal to noise ratio, Reflectivity, Clocks, Multilayers, Data storage, Reliability
High-density multilayer optical disc storage was investigated by employing advanced signal processing methods such as adaptive equalization and adaptive partial-response maximum-likelihood (PRML) detection. Preliminary experiments, recording on single-layer and dual-layer Blu-ray discs (BD), indicate storage capability of 33.3 GB/layer with adaptive 5-tap PRML. A new signal qualification method, sequenced amplitude margin quasi-error estimation (SAMQES), was introduced for high-density multilayer recording, and possibility toward a total storage capacity of 200 GB was examined by using a six-layer BD-Recordable disc. Despite coherent interlayer crosstalk and lower signal-to-noise ratio, SAMQES showed moderate increase from those in single-layer recording.
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