ALEXANDRIA, Va., May 26 -- United States Patent no. 12,640,537, issued on May 26, was assigned to FUJITSU OPTICAL COMPONENTS Ltd. (Kawasaki, Japan).

"Optical device and optical transmitter" was invented by Toshio Ishii (Yokohama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical device includes a generator, a light emitter, a modulator, an optical amplifier, a current source, a storage, and a controller. The generator generates an electric signal of a multilevel amplitude modulation method. The light emitter emits laser light. The modulator modulates the laser light using the electric signal and outputs an optical signal. The optical amplifier optically amplifies the modulated optical signal ac...