Vestigial phase shift keying modulation and systems and methods incorporating same
US8437644B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2011 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | Aug 7, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/5561
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In general, optical communication systems and methods may implement a vestigial phase shift keying (PSK) modulation format to enable relatively high transmission rates with closer channel spacing and improved signal detection in a WDM optical communication system. A PSK modulated signal may be correlated with a phase shift, for example, using a delay line interferometer (DLI), to generate a vestigial PSK signal, which may be pre-filtered, combined, and transmitted in the WDM system. The correlation with a phase shift compresses and shifts the signal spectrum such that intersymbol interference (ISI) length may be reduced with minimal increase in the bit error rate (BER) when the vestigial PSK signal is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.