KNTK 3 ft Toslink 5.0mm to Mini 3.5mm Audio Cable S/PDIF Digital Fiber Black

This cable features a full-sized Toslink connector on one end and a mini (3.5mm) Toslink connector on the other end, plus molded connector heads and strain-relief boots. Full-sized male TOSLINK optical audio connectors on one end and Mini male TOSLINK optical audio connectors on one end.

eBay