US 11,817,909 B1
Phase correction in high speed coherent optical communication
Or Vidal, Hod Hasharon (IL); and Yaron Yoffe, Hod Hasharon (IL)
Assigned to SOLANIUM LABS LTD., Hod Hasharon (IL)
Filed by Solanium Labs Ltd., Hod Hasharon (IL)
Filed on Aug. 24, 2022, as Appl. No. 17/822,109.
Claims priority of provisional application 63/236,254, filed on Aug. 24, 2021.
Int. Cl. H04B 10/00 (2013.01); H04B 10/61 (2013.01); H04B 10/035 (2013.01); H04J 14/00 (2006.01)
CPC H04B 10/6165 (2013.01) [H04B 10/035 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for phase correction, the method comprises:
generating in parallel and by a set of phase error detectors, a set of phase error detection results (PEDRs) related to a set of blocks of digital samples, the digital samples are frequency corrected and represent optical signals conveyed over a coherent optical communication link; wherein the PEDs introduce PED noise that is indifferent to phase errors of the set of the blocks of digital samples;
sending, in a sequential manner, the set of PEDRs, to a loop that comprises a loop filter;
generating, by the loop, phase difference results, wherein each phase difference result is indicative of a phase difference between a certain PEDR of the PEDRs and a loop filtered PEDR generated by filtering a PEDR that precedes the certain PEDR;
processing, by a phase correction unit, the digital samples and the phase different results, to provide phase corrected digital samples.