This paper presents the results of a crosstalk analysis of four optical wav
elength division multiplexed (WDM) cross-connect (OXC) topologies, An optim
al set of parameters is determined to reduce the total crosstalk, The scala
bility of the topologies is presented in terms of wavelengths and input fib
ers, The total crosstalk in function of the number of cascaded OXC's is com
pared for the four topologies.