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Transport of Assigned Wavelength Channels Over Ultra-high Speed Ethernet All-Optical DWDM Networks Under Constraints of Fiber Chromatic and Polarization Mode Dispersion Effects


Le Nguyen Binh, Le Huu Binh


Vol. 9  No. 8  pp. 27-37


High speed 10Gb/s and 40 Gb/s optical Ethernet and SONET or SDH transmission systems carrying multi-wavelength channels are considered as the backbone of the next generation optical metro-networking technological development. Under this ultra-high speed transmission and networking, dispersion effects due to linear chromatic and polarization differential mode group delays and nonlinear effects of the single mode optical fibers are critical. This paper reports the traffic transport characteristics of multi-wavelength-channel optical networks with the channel bit rate from 2.5 Gb/s to 40 Gb/s. A layer graph approach is proposed by partitioning the multi-wavelength multi-path networks into parallel logical layers assigned to each wavelength, the physical transmission layer, and a layer for channel management. Once the edge nodes of the network are established, a cost function is established for the routing and wavelength assignment that integrates the layers and the routers for connecting and routing of wavelength channels over the physical lightpaths. The wavelength transport paths are dynamically subject to wavelength availability, capacity of the lightpath and the dispersion limit imposed on selected routed hops. Blocking probability of the network traffics are obtained for different high speed cases. Severed blocking is observed for networks operating at speed higher than 20 Gb/s in metropolitan area. Advanced modulation formats and electronic equalization are expected to be useful in these networking scenarios. The blocking probability is further increased when the polarization mode dispersion effects are taken into account. Optical channels with bit rate greater than 20 Gb/s may not be operational if adaptive dispersion compensation is not implemented.


integrated routing, DWDM networks, network traffic, network graph