Routing and Wavelength Assignment and Survivability of Optical Channels in Ultra-high Speed IP over DWDM Networks Under Constraints of Residual Dispersion and Nonlinear Effects

Summary Ultra-high speed 10Gb/s and 40 Gb/s optical Ethernet and/or SONET transmission carrying multi-wavelength channels as well as IP over WDM are emerging as the next generation optical networking. Under this ultra- high speed transmission and networking, the dispersion effects due to linear chromatic dispersion effects are critical. This paper investigates the impacts of residual dispersion effects on optically multiplexed channels to be routed over terrestrial or metropolitan all-optical dense wavelength networks. We propose a routing algorithm that integrates the layers of the networks, the physical trans-mission layer, the network wavelength channel management layer and the routers for connecting and routing of wavelength channels over physical lightpaths which are under constraints of wavelength availability, transmission capacity of the lightpath and the dispersion effects over the routed hops. An algorithm, the Hop and Bandwidth Integrated Routing (HBIR), that integrates both the bandwidth availability and the routing hops of the light path, is proposed for routing of lightpaths in a layered graph model which is structured with a wavelength assigned for each layered with the logical and physical links, and an IP layer. The routing is determined by processing the physical links and the logical links in different layers of the model graph. Optical channels with bit rate of 2.5 Gb/s can be dynamically routed without much effects from the residual dispersion. However for channels of operating bit rate of 40 Gb/s under dispersion effects suffers a low survivability rate with a blocking probability significantly increased as compared with the case of no such constraints. These studies are also carried out for the optical networks which are under the effects of nonlinear self phase modulation.