Need help connecting a digital optic output to an old Bose surround sound

[Dpaolicelli]

I have a new LG smart TV that provides an optical out for audio. How do I connect this to my Bose surround system that only has standard input wires?

 

[kanewolf]

How many inputs does the Bose system have? If it is just two, you could get a optical to analog converter like this