Method for generating header and transition flags using DPD technology and optical device using the same

摘要

A method for generating header and groove/land transition flags using the DPD technology and an apparatus using the same are disclosed. The method first sets a first and a second threshold levels. Then, the method generates a phase difference signal. The method generates a first transition flag signal and a second transition flag signal, wherein the first transition flag signal is enabled when the phase difference signal is greater than the first threshold level and the second transition flag signal is enabled when the phase difference signal is smaller than the second threshold level. The method then generates a header flag signal according to the first and the second transition flag signal.