US Patent Issued to Fujikura on Sept. 29 for "Optical fiber preform production method, optical fiber preform, and optical fiber production method" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,747,183, issued on Sept. 29, was assigned to Fujikura Ltd. (Tokyo).

"Optical fiber preform production method, optical fiber preform, and optical fiber production method" was invented by Yoshimichi Amma (Sakura, Japan), Katsuhiro Takenaga (Sakura, Japan) and Ryohei Fukumoto (Sakura, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical fiber preform includes: a cladding glass body that is a cladding of an optical fiber, is cylindrical, and comprises an inner hole along an axial direction; a glass rod accommodated in the inner hole; and a dummy silica rod selected from either one of a first solid dummy silica rod fixed to a first end of the cla...