DP-QPSK demodulator
US8786938B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2013 |
| Grant date | Jul 22, 2014 |
| Priority date | — |
| Expiry date | Jan 14, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/223
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an embodiment, a demodulator includes first, second, third, fourth and fifth beam displacers, a half waveplate, and a quarter waveplate. The second beam displacer is positioned to receive an output from the first beam displacer. The third beam displacer is positioned to receive an output from the second beam displacer. The half waveplate is positioned to receive an output from the third beam displacer. The fourth beam displacer is positioned to receive an output from the half waveplate. The fifth beam displacer is positioned to receive an output from the fourth beam displacer. The quarter waveplate is positioned between the fourth beam displacer and the fifth beam displacer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.