Abstract

We have previously reported on the performance of Multilevel ML^TM technology on a wide variety of systems including CD-, DVD-, and blue-based systems [1-6]. ML technology enables increased capacity and performance over traditional binary-modulation systems. Implementing this technology requires the addition of a single integrated circuit or IC core to the standard electronics of current drives, so manufacturers can provide ML capability without altering existing optics, mechanics, or manufacturing infrastructure. In this paper, we describe precompensation and postcompensation, key Calimetrics’ technologies that enable ML recording. These technologies enable ML recording by making the native nonlinear recording channel behave as a simple linear channel as well as by dynamically adjusting for nonlinear channel variations among different media and drives.

© 2003 Optical Society of America