US 11,811,499 B1
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., Wimington, DE (US)
Filed by Lucidean, Inc., Wimington, DE (US)
Filed on Apr. 26, 2023, as Appl. No. 18/307,717.
Claims priority of provisional application 63/334,877, filed on Apr. 26, 2022.
Int. Cl. H04B 10/077 (2013.01); H04J 14/06 (2006.01); 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:
receiving a polarized signal from a fiber optic cable;
polarization un-rotating by 90 degrees the polarized signal into a first polarized optical signal and a second polarized optical signal, each having some of a second output of a laser light and some of an optical modulated data signal;
a polarization recover (PR) component for recovering a polarization of the first and second polarized optical signals based on a received polarization recovery signal to recover a polarization fixed first optical signal having the optical modulated data signal and to recover a polarization fixed second optical signal having the second output of the laser light, wherein the first and second polarization fixed first optical signal have a same polarization;
a carrier recovery (CR) component for: (a) recovering a frequency and a phase of the second output of the laser light from the polarization fixed second optical signal; (b) demodulating the polarization fixed first optical signal into a polarization and frequency fixed first optical signal having a QPSK data signal and a pilot tone signal; and (c) demodulating the polarization fixed second optical signal into a polar, frequency and phase fixed second optical signal that is the second output of the laser light;
a 90 degree optical hybrid component for splitting the polarization and frequency fixed first optical signal and the polar, frequency and phase fixed second optical signal into 4 optical QPSK quadrature component signals (I+, I−, Q+, Q−);
4 photodiodes (PDs) for converting the 4 optical quadrature component signals into 4 electrical current quadrature signals;
two TIAs for converting the 4 electrical current quadrature signals to 4 electrical voltage QPSK quadrature data signals; and
a polarization detector for detecting a polarization of the pilot tone signal to identify a polarization of a modulated signal and outputting the pilot signal measurement signal based on a detected polarization.