Integrated optical device with improved isolation between the semiconductor laser and the photodetectors
US4716559A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1986 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Aug 27, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1384
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.