Optical storage system having differential phase detector

摘要

A differential phase detector for an optical storage system is set forth. The differential phase detector includes a photodetector circuit arranged to detect light deviations associated with radial errors in the optical storage system. A non-linear equalizer is in communication with the photodetector circuit. The output of the non-linear equalizer is in communication with signal processing circuitry. The signal processing circuitry uses the equalized signals to generate one or more radial error signals.

主权项

1. A phase detector comprising:
difference logic configured to:
receive a first slicing circuit output signal of a first slicing circuit and a second slicing output signal of a second slicing circuit;generate a difference signal having a pulse width corresponding to a difference between edges of the first and second slicing circuit output signals; andaberration compensation circuitry configured to communicate with the difference logic, wherein the aberration compensation circuitry is adapted to ensure generation of the difference signal by the difference logic in the presence of signal aberrations occurring at the edges of the first and second slicing circuit output signals.