ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,422,614, issued on Sept. 23, was assigned to AMPLICONYX OY (Tampere, Finland).
"Active optical vortex fiber" was invented by Valery Filippov (Tampere, Finland) and Yuriy Chamorovskiy (Moscow).
According to the abstract* released by the U.S. Patent & Trademark Office: "Various example embodiments relate to active optical fibers and devices using active optical fibers. An active optical fiber may comprise a central part surrounded by an annular active core. The fiber may have a tapered longitudinal profile such that the fiber comprises a single-mode portion and a multimode portion. The annular core may have low birefringence, obtained for example by rotating (spinning) the fiber prefo...