I don't think you can do what you want to do, though you will want to consult the manual for your specific TV.
It seems that most TVs are not good about sending out an unmolested digital output via optical from the various inputs. Usually, TVs are designed primarily to be able to output the digital signal received via their tuners, and some even do that wrong, downgrading DD 5.1 to 2 channel. And your receiver does not have a USB input.
Also, if you mean the new lossless audio formats from Dolby and dts used with BD, none of those can pass via optical or coaxial digital connection.