US Patent Issued to NTT on June 2 for "Optical phase shifter, optical switch and 90 degrees optical hybrid" (Japanese Inventors)

ALEXANDRIA, Va., June 2 -- United States Patent no. 12,645,102, issued on June 2, was assigned to NTT Inc. (Tokyo).

"Optical phase shifter, optical switch and 90 degrees optical hybrid" was invented by Takashi Go (Musashino, Japan), Yuichiro Ikuma (Musashino, Japan), Kenya Suzuki (Musashino, Japan), Keita Yamaguchi (Musashino, Japan) and Ai Yanagihara (Musashino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical phase shifter in which a phase shift amount is kept constant in a wide wavelength region is provided. One aspect is the optical phase shifter constituting of two waveguides of a basic width, and configured so that two lights propagating through each waveguide have a phase difference, in...