Optical to co-ax output change

Hi, I'm new to this forum and have aquestion.I have a Sont XA-20ES cdp and does anyone know if the optical out can be changed to 75ohm co-ax digital output and aprox. how much it would cost?

You can find these for about $20 - but I would be concerned about added jitter - you might want to test it carefully versus the analog out of the CDP.
Can the cdp internally be changed over to co-ax digital output?I've read you can get cable adaptures to go from optical to co-ax but this really isn't recommended.I didn't make my original question quite clear, sorry.