ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,556,284, issued on Feb. 17, was assigned to FUJITSU Ltd. (Kawasaki, Japan).
"Optical transmitter that transmits multi-level signal" was invented by Guoxiu Huang (Kawasaki, Japan) and Hisao Nakashima (Kawasaki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical transmitter includes a signal processor and transmission circuit. The signal processor modulates a first signal to generate a first modulated signal, determines a modulo amplitude that is larger than an amplitude of the first modulated signal, inserts a second modulated signal into the first modulated signal to generate a transmission signal, corrects a symbol of the transmission sign...