US 11,757,558 B2
Systems, devices, and methods for dual polarization recovery
Segev Zarkovsky, Tel Aviv (IL); and Thomas H. Greer, III, Chapel Hill, NC (US)
Assigned to MELLANOX TECHNOLOGIES, LTD., Yokneam (IL)
Filed by MELLANOX TECHNOLOGIES, LTD., Yokneam (IL)
Filed on Sep. 22, 2021, as Appl. No. 17/481,624.
Prior Publication US 2023/0090061 A1, Mar. 23, 2023
Int. Cl. H04J 14/06 (2006.01); H04B 10/61 (2013.01); H04B 10/532 (2013.01)
CPC H04J 14/06 (2013.01) [H04B 10/532 (2013.01); H04B 10/6162 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a transmitter that generates a combined signal including a first group of optical signals and a second group of optical signals, the first group of optical signals comprising M+X number of optical signals in a first polarization mode, the second group of optical signals comprising N number of optical signals in a second polarization mode, wherein the number of N and M optical signals comprise payload signals, wherein the X number of optical signals comprises at least one first pilot signal; and
a receiver comprising a polarization recovery device including:
a plurality of couplers and a plurality of phase shifters alternately connected in series; and
a polarization controller that controls the plurality of phase shifters, wherein the polarization recovery device receives the combined signal and recovers, from the combined signal, the first group of optical signals with the first polarization mode and the second group of optical signals with the second polarization mode based on feedback indicative of at least one signal characteristic of the at least one first pilot signal.