Study And Innovation On Optical Circuit Switching Of Optical Network-on-chip

With the development of System-on-Chip(SoC) and Network-on-Chip(NoC), the problems of high latency, low bandwidth and high power consumption in electrical interconnection have seriously blocked the innovation and improvement for So C and NoC. Optical Networkon-Chip(ONoC) solve several problems by using optical interconnection instead of electrical interconnection. Optical circuit switching(OCS) is widely used in the designing of ONoCs. By using path-setup, data transmission and path-teardown, OCS can offer good network bandwidth, high switching speed and guarantee the reliability of the transmission. With the increment of network scale and the environmental conditions become increasingly complicated, OCS will lead to seriously network congestion and limit the scalability of the ONoC. Classical OCS do not support the communication of multi-cores to one core at the same time in ONoC.This thesis summarizes the background, and development of ONoC, summarizes the researches and developments on the classic OCS in ONoC. Based on the simulation for classic OCS, we analyze the performance of OCS in ONoC and improve OCS by several ways. Our research achievements are shown as follows.1. Focus on the path-setup blocking problem in OCS-based ONoC, in this thesis, we propose an architecture called Flyover for ONoC. Flyover combines time-division multiplex(TDM) and wavelength-division multiplex(WDM) to solve problems faced by OCS. By suing TDM-WDM communication method, setup stage in OCS-based ONoC is eliminated. Flyover is modularized into two network layers with cluster architecture to improve network scalability, flexibility and the number of time slots. With the result of OPNET simulation, Flyover has better performance compared with equivalent OCS-mesh ONoC under various traffic patterns.2. We further propose an architecture called TTWA for ONoC. TTWA combines torus topology, TDM technology and direction based wavelength assignment to solve problems faced by OCS-based ONoC and improve the inter-cluster parallel communications in previous TDM ONoC. A novel optical router is designed to support the communication in TTWA. The simulation results indicate that TTWA has further improve the network performance under various traffic patterns and improve the number of time slots in pervious TDM ONoC.3. Focus on the complex designing of network architecture and router structure and the problem of cannot support the communication of multi-cores to one core at the same time in the OCS-based ONoC, in this thesis, we propose a non-blocking wavelength routing ONoC based on two-dimension bus architecture is proposed to solve the problem face by previous bus based ONoC. By designing the architecture and communication strategy of the X bus and the Y bus respectively, the new ONoC realizes multi-cores communicate with a destination IP core simultaneously.