Digital phase estimator, digital phase locked loop and optical coherent receiver
US7970290B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2008 |
| Grant date | Jun 28, 2011 |
| Priority date | — |
| Expiry date | Jan 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/65
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention provides a digital phase estimator, a digital phase locked loop and an optical coherent receiver. The optical coherent receiver comprises a local oscillator laser, for supplying a local oscillator optical signal; an optical 90 degree frequency mixer, for mixing a received optical signal with the local oscillator optical signal; first and second balancing photoelectric detectors, for converting the optical signals outputted from the optical 90 degree frequency mixer into baseband electrical signals; first and second A/D converters, for respectively converting output signals from the first and the second balancing photoelectric detectors into digital signals; a digital phase locked loop, for compensating a phase difference between a carrier signal of the received optical signal and the local oscillator optical signal, and outputting the compensated signal; and a data recovering unit, for recovering data from the compensated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.