US Patent Issued to Fujikura on Dec. 16 for "Optical amplification apparatus" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,500,387, issued on Dec. 16, was assigned to Fujikura Ltd. (Tokyo).

"Optical amplification apparatus" was invented by Hiroyuki Kusaka (Chiba, Japan) and Masahiro Kashiwagi (Chiba, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical amplification apparatus includes a first amplification optical fiber, a second amplification optical fiber, a first pumping light source, and a second pumping light source. The first amplification optical fiber includes a first core and a first cladding layer. The first core is doped with an active element using a first active element doping concentration distribution. The first cladding layer is disposed out of th...