ALEXANDRIA, Va., June 18 -- United States Patent no. 12,327,983, issued on June 10, was assigned to FURUKAWA ELECTRIC Co. LTD. (Tokyo).
"Wavelength-variable laser" was invented by Junji Yoshida (Tokyo), Hirokazu Itoh (Tokyo), Satoshi Irino (Tokyo), Yuichiro Irie (Tokyo) and Taketsugu Sawamura (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical semiconductor device outputting a predetermined wavelength of laser light includes a quantum well active layer positioned between a p-type cladding layer and an n-type cladding layer in thickness direction. The optical semiconductor device includes a separate confinement heterostructure layer positioned between the quantum well active layer and the n-type ...