US Patent Issued to Nippon Telegraph and Telephone on June 24 for "Wavelength conversion apparatus" (Japanese Inventors)

ALEXANDRIA, Va., June 25 -- United States Patent no. 12,339,564, issued on June 24, was assigned to Nippon Telegraph and Telephone Corp. (Tokyo).

"Wavelength conversion apparatus" was invented by Takahiro Kashiwazaki (Musashino, Japan), Koji Embutsu (Musashino, Japan), Takeshi Umeki (Musashino, Japan), Osamu Tadanaga (Musashino, Japan), Takushi Kazama (Musashino, Japan), Asuka Inoue (Musashino, Japan), Nobutatsu Koshobu (Musashino, Japan) and Ryoichi Kasahara (Musashino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Even when excitation light having large power is used, damage at the end face of the optical fiber is suppressed, and reduction in wavelength conversion efficiency and reduction in phase s...