System and method for recovering carrier phase in optical communications
US9473250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2014 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Nov 8, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0075
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The embodiments of the invention provide methods to deal with problems of cycle slips, angular skew, and residual phase noise for high-speed optical communications employing any arbitrary high-order multi-dimensional modulation formats. The embodiments use a slip process analyzer, a skew angle estimator, and a phase noise variance estimator to provide feedforward soft-decision information of a carrier phase recovery (CPE) for more accurate likelihood calculation based on a high-order hidden Markov model (HMM). The log-likelihood calculation can be done jointly in dual polarization with joint Markov state transition. Some embodiments use a kernel filter or a particle filter for log-likelihood calculation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.