US Patent Issued to NTT on May 19 for "Semiconductor optical device" (Japanese Inventors)

ALEXANDRIA, Va., May 19 -- United States Patent no. 12,633,727, issued on May 19, was assigned to NTT INC. (Tokyo).

"Semiconductor optical device" was invented by Takuro Fujii (Tokyo), Shinji Matsuo (Tokyo) and Takuma Tsurugaya (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "There are included: a second semiconductor layer of a second conduction-type formed to be on and in contact with the active layer; and a third semiconductor layer of a second conduction-type formed on the second semiconductor layer, the third semiconductor layer is arranged above a formation region of the active layer, a bottom surface of the third semiconductor layer is arranged in the formation region of the active layer, and a w...