A Review on Placement of Wavelength Converters in Wdm P-cycle Network

The p-cycles can be described as preconfigured closed protection paths in a mesh network. Like rings, the protection path is preconnected in advance of any failure and protection capacity is very fast and simple. And like mesh p-cycle offers the high capacity efficiency. The use of wavelength converter in p-cycle enhances the capacity and rapid protection mechanism for mesh-restorable networks. We can tradeoff between costs associated with the number of wavelength converters required and the total spare capacity needed for protection. The most important finding is that the number of wavelength converters can be greatly reduced, with placing wavelength converters at the different points between a transparent optical working path layer and a corresponding set of single-wavelength p cycle protection structures. Here we are comparing different techniques named as sparse, partial and sparse-partial wavelength conversion. The main advantages of sparse partial wavelength conversion technique over the full conversion and no conversion are discussed.