Hi again,
I think this application is a bit too “macro” for OptiBPM or OptiFDTD, since there are a large number of waveguides and sources. If there is not significant coupling or crosstalk between each individual fiber you could determine the efficiency of injecting the fields.
We don’t have models in our system software for bundles of fiber, but if each fiber performs similarly you could simulate one of them and extrapolate. What type of results are you looking for?
Regards