Networking fiber in place of Toslink

I know this sounds crazy. I got a soundbar from a thrift store super cheap since it needed a PS which I had. I want to connect it to my TV and the only applicable connection to it would be toslink (fiber). I don't have any laying around, but I do have plenty of single & multimode fiber patch cables. What is the crazy chance that this would work?

I kinda got the singlemode to fit inside the toslink on the TV just so, and I could see the other end of it light up red. I didn't have time to plug it into the soundbar to see if it actually works.

EDIT: **FAIL**