I guess the term "fiber optics" escaped your notice. That term indicates microtubules. AFAIK, there are no known optical mechanism, other than via the MT in the optical tract.
The Synaptic Life of Microtubules
Introduction
In neurons, control of microtubule dynamics is required for multiple homeostatic and regulated activities. Over the past few decades, a great deal has been learned about the role of the microtubule cytoskeleton in axonal and dendritic transport, ...
www.ncbi.nlm.nih.gov
Well, that may be so in context of peer reviewed lab results, but this tells me that the main objection based on the warm, wet brain environment that makes quantum function "impossible", has been rendered moot. I believe the tests suggest quantum brain processes can happen and microtubules are potentially capable of these quantum processes. A BIG step!
To my knowledge there is no alternative model that contains sufficient networked numbers of processors to meet the requirement of an emergent non-computable (quantum) data processor, other than microtubule-synaptic networks.
p.s. Interesting that all Universal models, local or non-local, employ "abstract mathematics". It is one of my favorite "common denominators".