Filter-based DPSK communications system
US8886049B2 · kind B2 · utility
2Cited by
11References
19Claims
0Family size
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Key dates
| Filing date | Jul 2, 2013 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Jul 2, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/677
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A filter-based method of demodulating differentially encoded phase shift keyed (DPSK) optical signals, such as commonly used binary-DPSK (DBDPSK) and quadrature DPSK (DQPSK) signals, that can achieve optimal receiver sensitivity is described. This approach, which combines filtering and differential phase comparison, can reduce the complexity and cost of DPSK receivers by obviating delay-line interferometer-based demodulation. This can improve receiver stability and reduce size, weight, and power, while maintaining the ability to achieve optimal communications performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.