Photonic systems design requires simulation over a wide range of scales; fr
om wavelength-sized resonances in lasers and filters, to interactions in gl
obal networks, To design these global systems, while considering the effect
s of the smallest component, requires sophisticated simulation technology,
We have developed the Photonic Transmission Design Suite, which includes fi
ve different signal representations, so that the details of device performa
nce can be efficiently considered within a large network simulation. Altern
atively, a design can be studied using a coarse signal representation befor
e switching to a detailed representation for further refinement. We give ex
amples of the application of these representations, and show how the repres
entation of a signal is adapted as it propagates through a system to optimi
ze simulation efficiency.