I wouldn't do that. Doing so would render it completely useless, if not counterproductive (more noise/interferences, rather than less).
IMHO, the use of an optical network link may make sense, but only if you really use it to separate, turn away (also physically) as much of the the (electrically and possibly also acoustically) "noisy" stuff from the audio system and the listening room.
That is, it makes sense if you keep only a very low-power, low-noise minimal system (e.g. the "NAA", squeezelite/squeezeplay, netjack or any other similar streaming-based system) connected to the DAC and move everything else (disk server, DSP machine, etc) as far as possible from both the audio system and the listening room itself. For instance placing everything else in the basement, or at least in some other room (as far away as possible from the listening room).
Doing that may really reduce the sources of noise and interferences, including airborne and (audio system) power-line pollution to the minimum possible (regardless of how "noisy" the other parts of the system are).
Optical fibers are thin, flexible and do not pick-up electromagnetic noise and interferences. Single-mode ones can be practically as long as you need (actual limit being several kilometers). Thus they can be easily routed in-wall together with the electrical power lines. Being completely non-conductive, this is not even a safety risk. Hence, if you're aiming to reduce as much as possible any source of noise/interferences, there are really no reasons not to do so...