Abstract-The

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Internet Protocol layer multicast by means of electronic processing is going to be the bottleneck of the next generation optical networks. Optical routers with optical layer multicast capability will become the new focus to overcome the speed limit and simplify the logical network stack structure. In this paper, optical multicast technologies by multi-wavelength conversion are reviewed and assessed with regards to their suitability for optical routers. Furthermore, experimental performance validation of four potential multi-wavelength conversion techniques is demonstrated. Finally, promising technologies for optical multicast routers are suggested.

An overview is given of various optical packet labeling techniques. The architecture and technologies are discussed for optical packet routing nodes using orthogonal labeling with optoelectronic label processing, and for nodes using time-serial labeling with all-optical time-serial label processing. An example of a nearterm application is given, and a comparison of routing technologies is made regarding their cost and reliability aspects.