Optical EngineeringMultichannel decision feedback equalizer for high track density in optical recording
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A possible approach to high track density in optical recording is to reduce the track widths and eliminate the spacing between consecutive tracks. Parallel readback of several tracks and combined equalization of the multitrack readback signals is a viable approach toward reducing the deteriorating effects of interference in such a high-trackdensity system. Multichannel readback using laser diode arrays has been reported in optical recording. An additional advantage of multitrack readback is a high data rate. A novel multichannel decision feedback equalizer to reduce interference both within and across the tracks using 2-D feedback is presented. Simulation results shows good improvement in error-rate performance by using multichannel decision feedback equalization. By this readback method, tracks can be brought closer, thus increasing the areal density.