Adaptive post digital filter and inter-symbol interference equalizer for optical communication
US9755763B2 · kind B2 · utility
1Cited by
15References
18Claims
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Key dates
| Filing date | Jul 15, 2015 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Aug 8, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03261
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Modulated optical signals are received in a coherent optical receiver employing both post digital filter and inter-symbol-interference (ISI) equalizer such as a maximum likelihood sequence estimation (MLSE) or Bahl-Cocke-Jelinek-Raviv (BCJR) algorithms. Some disclosed techniques are directed to adaptively adjusting the impulse response in time domain (or equivalently the frequency response in frequency domain) of the post digital filter and the corresponding structure of ISI equalizer in different spectrum-narrowing operation scenarios.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.