A jitter model and signal processing techniques for data recovery in pulse-width modulation (PWM) optical recording are discussed. In PWM, information is stored through modulating sizes of sequential marks alternating in magnetic polarization or in material structure. Jitter, defined as the deviation from the original mark size in the time domain, will result in error detection if it is excessively large. A new approach is taken for data recovery by first using a high speed counter clock to convert time-marks to amplitude-marks, and signal processing techniques are used to minimize jitter according to the jitter model. The signal processing techniques include motor speed and intersymbol interference equalization, differential and additive detection, and differential and additive modulation.
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