US 12,218,707 B2
Coherent receiver with mixed signal processing
Xiang Zhou, Sunnyvale, CA (US); and Hong Liu, Palo Alto, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Filed by Google LLC, Mountain View, CA (US)
Filed on Dec. 6, 2022, as Appl. No. 18/075,938.
Application 18/075,938 is a division of application No. 17/665,988, filed on Feb. 7, 2022, granted, now 11,626,926.
Application 17/665,988 is a division of application No. 17/206,854, filed on Mar. 19, 2021, granted, now 11,283,526, issued on Mar. 22, 2022.
Application 17/206,854 is a division of application No. 16/675,375, filed on Nov. 6, 2019, granted, now 10,979,148, issued on Apr. 13, 2021.
Prior Publication US 2023/0094424 A1, Mar. 30, 2023
Int. Cl. H04B 10/61 (2013.01); H04B 10/2507 (2013.01); H04B 10/524 (2013.01); H04B 10/54 (2013.01); H04B 10/556 (2013.01); H04J 14/06 (2006.01)
CPC H04B 10/5561 (2013.01) [H04B 10/25073 (2013.01); H04B 10/524 (2013.01); H04B 10/541 (2013.01); H04J 14/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving, by a receiver system, a coherent Pulse Amplitude Modulation (PAM) encoded signal;
receiving, by the receiver system, a local oscillator (LO) signal;
performing, by the receiver system using mixed signal processing, polarization recovery between the received coherent PAM encoded signal and the LO signal using a first control loop;
performing, by the receiver system using mixed signal processing, phase recovery between the received coherent PAM encoded signal and the LO signal using a second control loop; and
receiving, by the receiver system, equalizer coefficients for the polarization and phase recovery.