Abstract

One approach to increase the capacity of DVD-RAM storage systems is to employ a PRML receiver, which consists of a linear equalizer for partial-response (PR) shaping, and a maximum likelihood sequence estimator (MLSE) [1] - [3]. When a PRML receiver is applied to an optical storage system, its performance tends to be degraded due to the signal asymmetry caused by the nonlinearity of photo-detectors and inaccurate write current control [4]. In this paper. we propose an equalizer with zero-memory nonlinearity for PR shaping and show that the proposed equalizer can outperform conventional linear equalizers.

© 1998 Optical Society of America