Research On Waveband Switching Technology For Optical Networks

With the emerging growth in data traffic as well as the substantial improvement on optical fiber transmission ability, further requirements have been placed on switching fabric and traffic grooming algorithms in Wavelength Division Multiplexing (WDM) optical networks. As a consequence, multi-granularity optical switching technology comes to our rescue. Research in this technology is mainly about the architecture of Multi-Granularity OXC (MG-OXC) and waveband traffic grooming algorithms.In this thesis, traffic grooming in multi-granularity optical switching networks are studied. The major contribution of this thesis is summarized as follows:1. Existing architectures of MG-OXC are analyzed and compared. We have observed that the coupling between the waveband switching plane and the wavelength switching plane is tight in traditional MG-OXC, which adds complexity to switching architectures of MG-OXC. Aiming at reducing complexity, a new switching architecture of MG-OXC is proposed in this thesis. In the proposed architecture, the wavelength switching plane and the waveband switching plane are completely independent from one another, which simplifies the switching architecture and reduces switching ports of the wavelength switching plane efficiently.2. Difference among several classic waveband switching algorithms are discussed and compared. To improve the waveband utilization, traffic grooming algorithms for the proposed new architecture are presented. Simulation results show that presented algorithms decrease the traffic blocking possibility efficiently, and hence improve the performance of the network.3. A prediction-based Same-Destination (S-D) traffic grooming strategy is proposed to against the poor performance of traditional S-D traffic grooming strategies. It is proved by simulation results that the new strategy outperforms traditional S-D traffic grooming strategy.