US Patent Issued to NEC on Nov. 25 for "Laser frequency drift compensation in forward distributed acoustic sensing" (California, New Jersey Inventors)

ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,808, issued on Nov. 25, was assigned to NEC Corp. (Tokyo).

"Laser frequency drift compensation in forward distributed acoustic sensing" was invented by Junqiang Hu (Davis, Calif.) and Yue-Kai Huang (Princeton, N.J.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a forward phase method using regular narrow line width CW laser, to cover the acoustic band with reduced processing speed, while tolerant laser frequency drift. A narrow linewidth CW laser is used to launch its power into an optical fiber at a transmitter side. At a receiver side, another narrow linewidth CW laser is used to coherently detect the received signal. The detected sig...