Amazon.com: Tensun 4K HDMI to HDMI Optical SPDIF TOSLINK Converter Adapter with 3.5mm RCA R/L Stereo HDMI Audio Extractor Splitter for Blue-ray PC Laptop Xbox One HDTV : Electronics
Sonos Optical Audio Adapter Optical digital audio to HDMI adapter cable at Crutchfield
SANOXY 164 ft. (50 m) High Speed Fiber HDMI Active Optical Cable (AOC), Plenum UL, 4K CBL-LDR-HM116-1150 - The Home Depot
Liberty AV Active Optical HDMI Cable, 18G, 4K@60, Plenum Rated - 25' – Conference Table Boxes