Optical technology has brought about altogether new paradigms in the networking field and created an immense momentum in the telecommunications market. Optical component technologies are now enabling the development and deployment of advanced, optical solutions for many networking needs. Overall, there have been some major trends towards optical networks comprising ring/mesh-routed topologies, and connection management intelligence. One of the key challenges to the evolving optical transport network (OTN) is network survivability; how traffic can be protected in OTN with survivability levels equivalent to those achieved in todays SONET/SDH networks. In this article, we focus on metro optical network protection. We begin with an overview of metro optical transport network survivability requirements, followed by an analysis of various network protection mechanisms and how these mechanisms may evolve to support the development of metro optical networks. The benefits of using ring protection scheme in metro optical networks are demonstrated.
Recently a lot of studies have been focused on the impact of the wavelength converters in a DWDM network for different switch architectures and different traffic load conditions. In addition, most of the previous studies, has assumed that the holding time of the wavelength connection is similar to that of telephone calls. This is not practical in the current optical network applications since most of connections stay permanently. In this paper, we consider new switch architecture with partial wavelength conversion capability. We investigate the benefit of the wavelength conversion in a DWDM network with limited number of wavelength converters assuming that the holding time of the wavelength connection is infinite. Our simulation results indicate that the performance of an optical network with only 25% of wavelength conversion capability is very close to that of an optical network with full wavelength conversion, for the network topology and traffic pattern considered. In another Metro application, we observe that the use of wavelength converters does not have any impact on the network performance.
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