US Patent Issued to NTT on Oct. 14 for "Branch ratio measuring device, branch ratio measuring method, and optical multiplexing/demultiplexing circuit manufacturing method" (Japanese Inventors)

ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,442,987, issued on Oct. 14, was assigned to NTT Inc. (Tokyo).

"Branch ratio measuring device, branch ratio measuring method, and optical multiplexing/demultiplexing circuit manufacturing method" was invented by Takui Uematsu (Musashino, Japan), Hidenobu Hirota (Musashino, Japan) and Hiroyuki Iida (Musashino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure is to provide a branch ratio measuring device, a branch ratio measuring method, and an optical multiplexer/demultiplexer circuit manufacturing method that do not require any optical sources for measurement.A branch ratio measuring device according to the present disclosure i...