Equalizer design for clock recovery based on multi-level optical disk using signal waveform modulation
Meng Shao, Jing Pei, Bo Yang · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2013
With smaller pits and lands in multi-level optical disks using signal waveform modulation than those in DVD disks, the ISI and nonlinear attenuation of the read-out signal become more serious. One ordinary way is using an equalizer at sample rate 1/T, we proposed one method of designing the equalizer in fixed sample rate with digital interpolation. According to the analysis of the multi-level optical disk channel, we get the target frequency-response cure and implement it with seven order FIR filter. From the result of the read out experiment with multi-level optical disk, the clock of the RF signal could be recovered with the proposed equalizer.