Easiest way to get a OpticalRendu hooked up is to get a Ethernet switch with Fibre output. The link below has such a device. Infact, that page has all the compatible pieces to get fibre into you USB DAC.
Accessories – Small Green Computer
4-PORT GIGABIT SWITCH WITH FIBER PORT
Then get an OpticalRendu and take the fibre cable from the above switch to the OpticalRendu. Then take a USB cable and hook up to your DAC.
If you stereo system is far from the FIOS router and you do not have Ethernet into your room with the audio system, then there is an easy way to resolve this. In this situation, I use a PowerLine adapter to send the music bits via the copper electrical wiring of my house. It does not matter about noise BEFORE the fibre cable.
I have 3 of these OpticalRendu’s. Send me a DM if you want more help on setting this up.