US Patent Issued to Sumitomo Electric Industries on Sept. 15 for "Wavelength tunable laser device and method of manufacturing the same" (Japanese Inventor)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,738,711, issued on Sept. 15, was assigned to Sumitomo Electric Industries Ltd. (Osaka, Japan).

"Wavelength tunable laser device and method of manufacturing the same" was invented by Tsutomu Ishikawa (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A wavelength tunable laser device includes a substrate, a plurality of first optical waveguides provided in the substrate, and a plurality of semiconductor elements bonded on a surface of the substrate and on the plurality of first optical waveguides. The semiconductor elements are formed of a III-V group compound semiconductor and have optical gains. Wavelengths with which the optical gains of th...