ALEXANDRIA, Va., June 16 -- United States Patent no. 12,306,478, issued on May 20, was assigned to Sumitomo Osaka Cement Co. Ltd. (Tokyo).
"Optical modulator and optical transmitter" was invented by Norikazu Miyazaki (Tokyo) and Toru Sugamata (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical modulator includes: an optical waveguide element including an optical waveguide formed on a substrate and a signal electrode for controlling a light wave propagating through the optical waveguide; a drive circuit for outputting two high-frequency signals; and two terminating resistors for respectively terminating outputs of the two high-frequency signals from the drive circuit. The output of one of the hig...