US Patent Issued to NEC on Nov. 11 for "Repeater device and transmission control techniques in quantum cryptographic communication system" (Japanese Inventor)

ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,470,853, issued on Nov. 11, was assigned to NEC Corp. (Tokyo).

"Repeater device and transmission control techniques in quantum cryptographic communication system" was invented by Hiroshi Imai (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A repeater device that can achieve signal transferring and path switching in optical transmission lines susceptible to environmental changes is provided. The repeater device receives weak signal light and normal reference light and transmits them in a communication network. The repeater includes: an optical route selector that selects an input-side spatial link connected to an upstream adjacent node and an outpu...