US 11,811,452 B2
Optical fiber symbol format conversion system and method
Shuang Sun, Shanghai (CN); Zuodong Wang, Beijing (CN); Wei Mao, Palo Alto, CA (US); and Yun Bai, Beijing (CN)
Assigned to WINGCOMM Co. Ltd., Nantong (CN)
Filed by WINGCOMM Co. Ltd., Nantong (CN)
Filed on Oct. 22, 2021, as Appl. No. 17/508,878.
Claims priority of application No. 202110347221.6 (CN), filed on Mar. 31, 2021.
Prior Publication US 2022/0321218 A1, Oct. 6, 2022
Int. Cl. H04B 10/25 (2013.01); H04B 10/50 (2013.01); H04B 10/516 (2013.01); H04B 10/66 (2013.01)
CPC H04B 10/25 (2013.01) [H04B 10/505 (2013.01); H04B 10/5161 (2013.01); H04B 10/66 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method comprising:
receiving a pulse-amplitude modulated (PAM4) electrical signal at a transmitter for transmission to a receiver;
decoding the PAM4 electrical signal into a pair of non-return-to-zero (NRZ) electrical signals;
converting the pair of NRZ electrical signals into a corresponding pair of NRZ optical signals including a first NRZ optical signal and a second NRZ optical signal;
transmitting the first NRZ optical signal to a receiver over an optical communication channel; and
transmitting the second NRZ optical signal to the receiver over the optical communication channel, wherein the transmitter is configured to switch between a PAM4 signal transmission and an NRZ signal pair transmission.