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Hello, Thank you for the question. You can use a soundbar with an Optical input with this TV, you will simply need an SPDIF to Optical converter to allow them to work together. I can pull up a link to this device if you'd like?
Actually though, I have your TV pulled up in front of me right now, and it's showing that you have an Optical jack labeled "Optical" right next to the Audio Out jacks on the rear of the TV. Does your set not have this and only has the round RCA-type SPDIF plug in?
The converter below takes an "SPDIF" (digital coaxial which is the other term) Input, and then converts it to an Optical Output. SO if your TV only has the single round SPDIF port, then you will simply use the converter below and can then connect it to any soundbar that uses Optical:
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Do you need further assistance with this?
So to answer your question more directly- Yes, you can use a soundbar with Optical Input with this Vizio TV. Let me know if you need anything further.