Methods and apparatus for beam shaping in optical wireless communications system
US6909854B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2000 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | May 26, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/1121
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical wireless communications system (1) comprises a server or transceiver hub (6) transmitting and/or receiving optical communications with geographically dispersed subscriber units (8) via optical beams. The transceiver hub (6) transmits a beam pattern that has an efficient, rectangular, flat-topped far field optical profile, thus permitting less complex and less expensive transceiver equipment to be employed in the transceiver hub (6) and in the subscriber units (8). In one embodiment, the transceiver hub (6) comprises an optical source (52, FIG. 3), an asymmetrical lens such as a cylindrical lens (60, FIG. 3), and a diffraction element such as a diffractive phase plate (65, FIG. 3). Various methods of shaping an optical transmission profile are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.