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High-density multilayer optical disc stor age was investigated by em ploying advanced signal pro cessing 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, sequence d 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. Keywords : Blu-ray disc, high-density recording, multilayer, ad aptive PRML, interlayer crosstalk, SAMQES, 200 GB 1. INTRODUCTION Blu-ray disc (BD) systems have already in corporated dual-layer disc structures to increase their storage capacity up to 50 GB for both read-only and recordable applications. |
