ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,555,971, issued on Feb. 17, was assigned to NEC Corp. (Tokyo).
"Light amplification device, light transmission system, and light amplification method" was invented by Hitoshi Takeshita (Tokyo), Keiichi Matsumoto (Tokyo) and Hidemi Noguchi (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Light amplification devices using coupled multi-core optical fibers have a figure of merit that temporally varies, which makes it difficult to perform performance evaluation and to build a light transmission system using the same. Accordingly, a light amplification device of the present invention comprises: a band control means that controls the wavelength band of a...