ALEXANDRIA, Va., June 18 -- United States Patent no. 12,326,642, issued on June 10, was assigned to FUJITSU OPTICAL COMPONENTS Ltd. (Kawasaki, Japan).
"Wavelength filter and laser apparatus" was invented by Yukie Iga (Tachikawa, Japan), Hirotomo Izumi (Kawasaki, Japan), Kazumasa Takabayashi (Atsugi, Japan) and Suguru Akiyama (Tsukuba, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A wavelength filter includes a first filter circuit and a second filter circuit. The first filter circuit that has a passband that is obtained from a vernier effect by connecting, in series, a plurality of ring resonators each having a different transmission wavelength interval and that is within a gain band of an optical amp...