Modulating retro-reflector optical communication using polarization differential signaling
US8396373B2 · kind B2 · utility
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11References
19Claims
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Key dates
| Filing date | Mar 27, 2009 |
| Grant date | Mar 12, 2013 |
| Priority date | — |
| Expiry date | Jun 1, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2587
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A retroreflector coupled with a polarization rotator is provided according to some embodiments. The polarization rotator can be designed and/or configured to introduce a fraction of a wavelength phase difference in a received beam of light prior to reflecting the beam of light back toward the source of the light. By switching the state of the polarization rotator a communication signal can be modulated on the return beam of light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.