Accumulation of inband crosstalk in all-optical networks is studied. By app
lying statistical methods, we have investigated how inband crosstalk accumu
lation influences the performance of optical networks of different configur
ations. Our study shows that there exists a delicate dependence between net
work topology and robustness with respect to accumulation of inband crossta
lk, A method is proposed to design optical networks with optical paths sati
sfying a certain level of inband crosstalk performance.