Drive Considerations for Blu-ray Multi-Layer Discs

Abstract

In this paper we look at the issues involved in the drive design for multi-layer Blu-ray Disc. We will discuss the layer thickness correction and signal to noise ratio. Furthermore we will experimentally investigate the layer cross-talk. The cross-talk from data on other layers, and the consequences of the layer cross-talk for the radial push–pull signal of the main spot and the satellite spots are addressed. It is found that a simple drive design is still possible, provided that for radial tracking only the main spot is used.