Feedforward decision-free pilot-aided phase noise estimation for coherent optical M-QAM systems
US10284303B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 2017 |
| Grant date | May 7, 2019 |
| Priority date | — |
| Expiry date | Jun 2, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0075
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus includes an electronic digital signal processor having electrical inputs for receiving a first sequence of measurements of values of a transmitted modulated optical carrier received in a coherent optical receiver and having electrical outputs for a stream of determined transmitted data values demodulated therein from the first sequence. The electronic digital signal processor has first circuitry to determine phase offsets of received pilot values from the first sequence. Additionally, the electronic digital signal processor has second circuitry to correct phase offsets of received ones of the data values from the determined phases of pilot values and data values being temporally interleaved in the transmitted modulated optical carrier. A system and a method are also included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.