Integrated optical device with improved isolation between the se

Details Integrated optical device with improved isolation between the se Integrated optical device with improved isolation between the se

1986-08-27

1987-12-29

Cardillo, Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369121, G02B 610, G02B 632, G11B 7135

Patent

active

047165596

ABSTRACT:
An optical head for a laser memory disk in accordance with the present invention containing a substrate (1); a waveguide layer (3) formed over a main surface of the substrate; a semiconductor laser (4) provided at an end of the waveguide layer for injecting laser beams into the waveguide; a focusing grating coupler (6) formed on the waveguide layer for focusing the injected laser beams on the disk and introducing beams reflected back from the disk into the waveguide; beam splitters (5) formed on the waveguide layer between the semiconductor laser and the focusing grating coupler, for bisecting each of the reflected beams at a prescribed acute angle; photodetectors (10) for converting the bisected beams into electrical signals; optical isolators (17, 18) formed between the semiconductor laser and the photodetectors.

REFERENCES:
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4478483 (1984-10-01), Sprague
"High-Performance Focusing Grating Coupler Fabricated by Electron-Beam Writing", T. Suhara et al., Technical Digest of Seventh Topical Meeting on Integrated and Guide-Wave Optics, ThD4; Florida, U.S.A., Apr. 24-26 (1984).
"Integrated Optical Photodetector", D. B. Ostrowsky et al., Appl. Phys. Lett., vol. 22, No. 9, 1 May 1973, pp. 463-464.

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