US Patent Issued to Fujikura on May 12 for "Active element added-optical fiber, preform for active element added-optical fiber, resonator, and fiber laser device" (Japanese Inventors)

ALEXANDRIA, Va., May 12 -- United States Patent no. 12,627,114, issued on May 12, was assigned to Fujikura Ltd. (Tokyo).

"Active element added-optical fiber, preform for active element added-optical fiber, resonator, and fiber laser device" was invented by Tsukasa Hosokawa (Chiba, Japan), Rintaro Kitahara (Chiba, Japan) and Ryoichi Nishimura (Chiba, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An active element added-optical fiber includes a core, having a radius d and including a first region and a second region, and a cladding that surrounds an outer peripheral surface of the core without a gap and propagates light in a few mode. The first region is a region from a central axis of the core to a rad...