US 12,413,328 B2
Polarization-multiplexed self-homodyne analog coherent (PM-SH-ACD) architecture for optical communication links
Aaron Maharry, Goleta, CA (US); Hector Adolfo Andrade Paez, Goleta, CA (US); Clint Lee Schow, Santa Barbara, CA (US); Larry Allen Coldren, Santa Barbara, CA (US); and James Franklin Buckwalter, Santa Barbara, CA (US)
Assigned to Lucidean, Inc., Goleta, CA (US)
Filed by Lucidean, Inc., Wimington, DE (US)
Filed on Oct. 23, 2023, as Appl. No. 18/492,575.
Application 18/492,575 is a continuation of application No. 18/307,717, filed on Apr. 26, 2023, granted, now 11,811,499.
Claims priority of provisional application 63/334,877, filed on Apr. 26, 2022.
Prior Publication US 2024/0056214 A1, Feb. 15, 2024
Int. Cl. H04J 14/06 (2006.01); H04B 10/077 (2013.01); H04B 10/63 (2013.01)
CPC H04J 14/06 (2013.01) [H04B 10/077 (2013.01); H04B 10/63 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A system for polarization-multiplexed self-homodyne analog coherent (PM-SH-ACD) architecture for optical communication links, the system comprising:
a receiver section having:
a polarization splitter rotator (PSR) for splitting received light from an optical fiber into its two constituent polarization components;
a polarization recovery (PR) component for demultiplexing the two constituent polarization components into two demultiplexed polarization signals using a pilot tone or other signal;
a carrier recovery (CR) component for locking the phase of the two demultiplexed polarization signals at the output of the PR component into a first and a second phase-locked signal, the first phase-locked signal containing a modulated signal and the second phase-locked signal containing an unmodulated signal;
a 90 degree optical hybrid component for producing optical quadrature components of the two phase-locked signals;
photodiodes (PDs) for converting the optical quadrature components into electrical current quadrature signals;
two TIAs for converting the electrical current quadrature signals to electrical voltage quadrature data signals; and
a polarization detector for detecting one or more pilot tone signals used by the PR component to determine the state of polarization of the two constituent polarization components.