ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,463,725, issued on Nov. 4, was assigned to NEC Corp. (Tokyo).
"Optical add/drop multiplexer and optical transmission method" was invented by Motoyoshi Kawai (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical add/drop multiplexer includes: a first wavelength selector configured to output an optical signal of each wavelength of an inputted first wavelength multiplexed signal while selecting a path for each wavelength; a measurement circuit configured to measure optical power of an inputted optical signal; and a second wavelength selector including a circuit configured to output an optical signal of each wavelength of the first wavelength mult...