Abstract
The present invention provides a noise estimator for determining an optical signal-to-noise ratio (OSNR) value of a QAM optical signal. The noise estimator comprises an optical detector configured to directly detect the optical signal and provide an electrical QAM signal representing an instantaneous amplitude of the detected QAM optical signal. A signal processor is configured to determine a statistical parameter value of a predetermined probability density function representing a single fit to a power amplitude distribution of the QAM electrical signal at a first timing within a power eye diagram representation.
| Original language | English |
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| IPC | H04B 10/ 079 A I |
| Patent number | WO2016202923 |
| Filing date | 21/04/2016 |
| Country/Territory | International Bureau of the World Intellectual Property Organization (WIPO) |
| Priority date | 21/04/2016 |
| Priority number | EP20160166385 |
| Publication status | Published - 22 Dec 2016 |