US Patent Issued to NTT on April 14 for "Optical access system and control signal superimposition method" (Japanese Inventors)

ALEXANDRIA, Va., April 15 -- United States Patent no. 12,604,122, issued on April 14, was assigned to NTT Inc. (Tokyo).

"Optical access system and control signal superimposition method" was invented by Kazutaka Hara (Musashino, Japan), Junichi Kani (Musashino, Japan), Shin Kaneko (Musashino, Japan), Takuya Kanai (Musashino, Japan) and Yumiko Senoo (Musashino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is an optical access system that performs communication using an optical signal on which a management control signal used for management and control is superimposed, the optical access system including: a subscriber device on a transmitting side that generates an optical signal by superimposi...