Abstract
Optical disk readout based on direct optical feedback to a semiconductor laser is studied via simulations. Laser dynamics and the diffraction of light in the extremely short external cavity formed by the laser front facet and the optical disk surface are taken into account. We compute both the variation of the laser's output power and its oscillation spectrum versus the position of scanned data marks. The characteristics of the laser's spectral response versus flying height and versus laser facet reflectance variations are described. Techniques for achieving various types of enhanced playback are discussed.
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