Coarse frequency offset estimation and correction for high-speed optical communications
US8639126B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2012 |
| Grant date | Jan 28, 2014 |
| Priority date | — |
| Expiry date | May 5, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03057
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and devices are described for compensating for a coarse frequency offset between a received optical signal and a local oscillator at a demodulator. Multiple samples are received of an output of a discrete Fourier transform performed on the received optical signal. A magnitude of each sample is determined, and the determined magnitudes may be filtered by a digital domain filter. A difference is computed between the determined magnitudes for a first set of the samples and the determined magnitudes for a second set of the samples, and a local oscillator correction factor is generated based on at least the computed difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.