US Patent Issued to FURUKAWA ELECTRIC on July 14 for "Optical fiber" (Japanese Inventors)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,679,764, issued on July 14, was assigned to FURUKAWA ELECTRIC Co. LTD. (Tokyo).

"Optical fiber" was invented by Kazunori Mukasa (Tokyo) and Keiichi Aiso (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical fiber includes a core portion made of silica-based glass; and a cladding portion made of silica-based glass having lower maximum refractive index than the core portion, the cladding portion surrounding an outer periphery of the core portion. The core portion is doped with an alkali metal element and chlorine. An average concentration of chlorine is higher than 800 atomic ppm on a cross-section perpendicular to a longitudinal direction of t...