ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,512,909, issued on Dec. 30, was assigned to FANUC Corp. (Yamanashi, Japan).

"Optical communication device and optical communication system" was invented by Yoshiki Satou (Yamanashi-ken, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical communication device according to an embodiment is provided with: a communication circuit for transmitting and receiving a signal using a first communication optical fiber connected to a first port; a tester circuit for transmitting and receiving a test signal using a loop-back optical fiber connected to a second port; a determining unit which, when the amount of optical reception of the test signal is lower...