Method and apparatus for storage and retrieval with multilayer optical disks

摘要

The multilayer optical disk system comprises an optical disk unit including a number of connected optical disks, a number of light sources for providing a number of light beams of different wavelengths, and a wavelength multiplexer for combining the number of light beams into a single beam. Axially dispersing optics are provided, for simultaneously focusing the single beam onto two or more of the optical disks. A wavelength demultiplexer is provided, for splitting light reflected from the two or more of the optical disks according to wavelength to produce two or more separate beams, and a number of detectors detect one of the two or more separate beams.