ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,438,330, issued on Oct. 7, was assigned to Fujikura Ltd. (Tokyo).
"Optical device and fiber laser apparatus" was invented by Yasuhiro Mashiko (Sakura, Japan), Shinichi Sakamoto (Sakura, Japan) and Sho Namiki (Sakura, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical device includes a first fiber including a first reflector, a second fiber including a second reflector, and an amplifying fiber that has a normalized frequency that is greater than or equal to 5.13 and is wound so as not to intersect on one plane. The amplifying fiber includes an outer section wound in a circular manner. The amplifying fiber includes an inner section having firs...