Wavelength selective optical devices using optical directional coupler
US4900119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Apr 1, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12164
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
New types of narrowband wavelength selective optical devices are described. Various configurations are possible, according to the invention, that perform as narrowband wavelength selective transmission or reflection filters or as narrowband wavelength selective optical taps or combiners. The optical devices of the invention include a 3 dB optical directional coupler and wavelength selecting elements such as Bragg reflection gratings or Fabry-Perot resonators usually positioned in optical symmetry with respect to the directional coupler. Two or more wavelength selecting elements can be used to obtain desired filtering characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.