US Patent Issued to SUMITOMO ELECTRIC INDUSTRIES on Oct. 14 for "Wavelength multiplexer/demultiplexer" (Japanese Inventors)

ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,442,983, issued on Oct. 14, was assigned to SUMITOMO ELECTRIC INDUSTRIES LTD. (Osaka, Japan).

"Wavelength multiplexer/demultiplexer" was invented by Masato Tanaka (Osaka, Japan), Hidehisa Tazawa (Osaka, Japan), Eiichiro Yamada (Osaka, Japan) and Masato Furukawa (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A wavelength multiplexer/demultiplexer includes a first collimator, M-number of second collimators, M-number of wavelength selective filters, and a base plate. Each of the wavelength selective filters includes a substrate having optical transparency and a multilayer film. The substrate includes a first main surface and a second main sur...