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Dense Wavelength Division Multiplexing (DWDM) allows hundreds of wavelength channels to be carried in a single optical fiber, at the rate of 40 Gb/s and beyond, and is the most promising solution for next generation networks. However, an all-optical-packet switched DWDM network cannot be practically realized due to limitations on optical technologies. We present a DWDM multimode router architecture, which supports electronic packet switching, optical circuit switching, and optical burst switching modes on the same router platform. The multimode router is capable of dynamically reconfiguring wavelengths to operate in the desired switching modes. This approach allows short messages to be switched electronically using packet switching, while allowing the majority of the data transfer (e.g., video) to pass core routers optically. It greatly reduces the need for expensive Optical-Electrical-Optical (O-E-O) converters. In this work, we have proposed the design and also analyzed the multimode router architecture. We analyzed the cost, performance, and energy consumption of the multimode router. More specifically, we developed an analytical cost model to show that the multimode router is cost effective across a wide range of technology factors. A novel dynamic resource allocation method called Predictive Need-based Optimized Resources Allocation (PNdORA) was proposed. The scheme predicts the need of each optical port in the future time frame, and allocates O-E-O converter pairs in real-time. Results indicate that this method improves performance of the multimode router, by several orders of magnitude, under abruptly varying traffic. We have also developed an energy consumption model of the multimode router, and compared it with existing models. We propose the use of MEMS actuated mirrors in the optical switching fabric, as these consume far less energy than any other optical switching fabrics. We show that by deploying the strengths of electronic packet switching, optical circuit switching, and optical burst switching, the multimode router is a cost effective candidate for future bandwidth needs while having a low carbon footprint.



DWDM, Optical Burst Switching, Optical networks, Resource Allocation, Hybrid Routers