Thesis Examination Committee

Prof Siu Wing CHENG, CSE/HKUST (Chairperson)

Prof Chin-Tau LEA, ECE/HKUST (Thesis Supervisor)

Prof Kai-Wei KE, Department of Computer Science and Information Engineering, National Taipei University of Technology (External Examiner)

Prof Jiang XU, ECE/HKUST

Prof Danny TSANG, ECE/HKUST

Prof Brahim BENSAOU, CSE/HKUST

Abstract

The energy-per-bit efficiency has quickly become the ultimate limiting factor in the design of a switching fabric for routers and data center networks. People are now turning to optics for solutions. Different optical devices have been invented recently and each has its own advantages and limitations. How to find suitable optical switching architectures to exploit their advantages and avoid their limitations has been a hot research area. 

In this thesis, we study some architecture issues related to two optical switching technologies: AWGs (Arrayed waveguide gratings) and silicon photonic microrings. AWGs have been used in optical datacenter networks, and the microrings in optical NoCs (networks on chips). But AWG-based optical switches have two limitations: scalability and crosstalk. We intend to tackle these two issues in this thesis. We explore constraint-based scheduling to reduce the crosstalk in AWG-based switches which are based on single-stage and two-cascaded AWGs. We also design a highly scalable AWG-based switch architecture which can meet the capacity demand of future data center networks. For microring-based NoCs, we focus on power minimization, which has become an ultimate bottleneck in embedded systems. We study how to use routing to reduce power consumption in microring-based NoCs