Methods and apparatus for coherent holographic data channels
US9703260B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2015 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Aug 20, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2675
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Methods and devices for coherent holographic data channel techniques. Coherent techniques for data detection generally include homodyne and heterodyne detection. Techniques for quadrature homodyne detection, resampling quadrature homodyne detection, n-rature homodyne detection, and spatial wavefront demodulation. Coherent detection techniques in turn enable coherent channel modulation techniques such as phase modulation (including binary phase shift keying, or BPSK; phase quadrature holographic multiplexing, or QPSK; and quadrature amplitude modulation, or QAM). Coherent detection may also enable or improve the performance of other channel techniques such as partial response maximum likelihood (PRML), the various classes of extended PRML, and of noise-predictive maximum likelihood (NPML) detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.