Optical pick-up using wavelength guide with grating coupler ther

Details Optical pick-up using wavelength guide with grating coupler ther Optical pick-up using wavelength guide with grating coupler ther

1989-08-01

1992-11-03

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369118, 369122, G11B 700

Patent

active

051611481

ABSTRACT:
An optical pick-up for an optical disk has a semiconductor laser having an optical axis for generating a laser beam. An objective lens focuses the laser beam onto an optical disk disposed in the path of the optical axis of the semiconductor laser. A wavelength between the semiconductor laser and the objective lens has a plurality of input grating couplers for coupling the laser beam reflected from the optical disk into the waveguide for propagating beams in a plurality of directions. A plurality of output grating couplers radiate the propagated beams from the waveguide. A plurality of photodetectors detect the radiated beams from the output grating couplers.

REFERENCES:
patent: 4779259 (1988-10-01), Kono et al.
patent: 4797867 (1989-01-01), Sunagawa

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