Controlled-linewidth laser source
US4503541A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1982 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Nov 10, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/026
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Laser linewidth is controlled by reflecting a certain portion of the laser light back into the laser cavity. This control is accomplished by aligning the active layer on an electroabsorptive cell with the active layer of a semiconductor laser on a single substrate with a first waveguide therebetween. Light from the laser is guided by the first waveguide to the electroabsorptive cell whose light absorption is electronically controlled. The laser light propagates through the active region in the electroabsorptive cell and then is guided by a second waveguide to a reflection facet. The laser light is reflected by this reflection facet back through the waveguide-cell-waveguide-laser light path. The foregoing device can be formed using either a monolithic or a hybrid design.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.