Optical wireless data communication system, and transmitter and receiver used therefor
US6310707A · kind A · utility
17Cited by
15References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1997 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Oct 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C7/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Based on binary transmission data 12, a receiver 11 emits electromagnetic waves 13 with modulated plane of polarization into a free space 16. The data propagates along the free space 16 as the azimuth of the plane of polarization. A receiver 17 accepts the electromagnetic wave 13 with modulated plane of polarization discriminates the data based on the state of the plane of polarization, and outputs the binary received data 18. The data and the clock data are transmitted from a plurality of light-emitting units with different polarization states or wavelengths to omit PLL circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.