AT&T ST Optical at each end was the best way as Wadia/Teac/ML used to do as a very expensive option, especially when used with a dab of crystal clear optical "Indexing Matching Fluid" on each end to take up any minute air gaps. way out in front of any other digital hook up.
https://5.imimg.com/data5/DP/GX/IB/SELLER-3037762/st-fibre-optic-connector-500x500.png
https://audio-heritage.jp/TEAC-ESOTERIC/player/vrds-20(9).jpg
Cheers George