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The authors proposed a selective assign shortest path first (SASPF) algorithm for routing and wavelength assignment in the presence of four wave mixing (FWM) in wavelength division multiplexing network with a design parameter Vm. In order to maintain a reasonably good performance in terms of blocking probability to fulfil the connection requests but also to allow acceptable FWM effects, Vm is an important design parameter (number of established optical channels to fulfil the connection requests but also to allow acceptable FWM effects). If its value is too low, many connection requests will not be able to establish, which may lead to higher blocking probability. On the other hand, if its value is too high, it may lead to obvious FWM effects that will affect the network performance. Thus, Vm must be optimum to balance the requirement of the connection requests and also the induced FWM crosstalks. Performance results show that SASPF algorithm outperforms the comparison scheme such as traditional assign shortest path first resulting in low blocking probability with a specific value of Vm.