Abstract

In optical recording, phase change media has such advantages as direct overwriting, no need for magnetic head and large signal amplitude using simple optics [1]. It is important to develop an appropriate channel model for phase-change media optical recording as it may help us find good equalization and detection schemes. Conventional channel models consider marks as one-dimensional (along the track) and assumes linear superposition in readout [2]. However, as the recording density is increased, mark shapes for different lengths become different and the linear model tends to be less valid. In this paper, we present a more realistic channel model which considers both write and read processes as two-dimensional. An adiabatic thermal model is applied to write marks and geometrical optics is assumed in readout. The resulting channel model consists of two linear filters with a nonlinearity sandwiched in between.

© 1998 Optical Society of America