Optical filters
US6198863A · kind A · utility
26Cited by
14References
18Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 28, 1998 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Apr 28, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/5045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical filter is formed from at least two grating located in a waveguide region of a semiconductor optical device. Each grating has a multiple peak optical passband. The gratings are spaced apart in the waveguide region and form an optical cavity having a comb-filter characteristic. The gratings may be located in the active region of an optical gain element and in a preferred example are superstructure gratings (SSGs). A number of filters may be joined together in series.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.