Multi-aperture holographic optical element for illumination sensing in a free space optical communication system
US6661546B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 2002 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Jul 11, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A free space (FSO) receiver includes an illumination sensing unit with multiple illumination apertures. The illumination sensing unit is used in deriving alignment information from portion(s) of a received FSO signal that are incident on the illumination apertures. The FSO receiver provides this information to the FSO transmitter that transmitted the FSO signal so that the FSO transmitter can adjust the direction it is pointing. The illumination apertures can be formed in a holographic optical element on a single substrate. Further, transmission, reception, tracking and/or spotting scope apertures may be formed in the single substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.