Even though, the techniques of electronic packet switching are able to meet bandwidth requirement of today’s network traffic, they are limited by abilities of installed electronic parts and demand for transferred data rate, which grows each year. The optical technology used in electronic packet switched networks is used only for poin-to-point data transfers, where data are converted to electric domain for routing purposes, than they are processed and converted back to optical domain at the end of the node. The priority of networks evolution is to remove this conversion bottleneck and to process data in all-optical domain. Such a network which process data in all-optical domain is called the photonic network or the all-optical network.