ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,411,366, issued on Sept. 9, was assigned to TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD. (Hsinchu, Taiwan).
"Waveguide structure" was invented by Chan-Hong Chern (Palo Alto, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical phase-shifting device includes a ribbed waveguide portion on an insulating layer, the waveguide portion having a p-n or p-i-n junction extending in a longitudinal direction and having a height. A pair of slab portions are disposed adjacent the waveguide portion, one on each side of the ribbed waveguide portion and on the insulation layer. The slab portion have higher doping concentrations than the respective doping...