Hybrid Optical Switching Network Research Articles

Hybrid Optical Switching for Data Center Networks

Current data centers networks rely on electronic switching and point-to-point interconnects. When considering future data center requirements, these solutions will raise issues in terms of flexibility, scalability, performance, and energy consumption. For this reason several optical switched interconnects, which make use of optical switches and wavelength division multiplexing (WDM), have been recently proposed. However, the solutions proposed so far suffer from low flexibility and are not able to provide service differentiation. In this paper we introduce a novel data center network based on hybrid optical switching (HOS). HOS combines optical circuit, burst, and packet switching on the same network. In this way different data center applications can be mapped to the optical transport mechanism that best suits their traffic characteristics. Furthermore, the proposed HOS network achieves high transmission efficiency and reduced energy consumption by using two parallel optical switches. We consider the architectures of both a traditional data center network and the proposed HOS network and present a combined analytical and simulation approach for their performance and energy consumption evaluation. We demonstrate that the proposed HOS data center network achieves high performance and flexibility while considerably reducing the energy consumption of current solutions.

Transmission mechanism based on burst filling in hybrid optical burst/circuit switching networks

Hybrid optical switching networks make full use of the advantages of Optical Circuit Switching (OCS) and Optical Burst Switching (OBS). In parallel hybrid optical switching networks, edge nodes choose a switching mode for traffic and no longer change. The inflexible decision making of the traffic transfer mode leads to low resource utilization when the arrival rate of the OCS traffic is lower than the capacity of the light path. In this paper, a new transmission scheme is proposed to improve resource utilization for hybrid optical switching networks. When the traffic arrival rate of the light path is lower than the transmission rate of the light path, the OCS traffic flow is reshaped at the edge nodes to generate a series of voids. Then, several message packets are sent along the light path to inform the core nodes of the voids of the light paths that represent the unused bandwidth resources. To improve the resource utilization, the voids can be filled with data bursts by core nodes. The simulation results show that the new scheme can effectively reduce the burst loss rate and improve the link utilization of the hybrid optical switching network on the premise of a providing service quality guarantee for OCS traffic.

Hybrid Optical Switching for an Energy-Efficient Internet Core

As Internet traffic grows, current core network technologies will raise issues in terms of energy consumption. Here, the authors propose three possible optical network architectures for the next-generation Internet core, including an all-optical hybrid optical switching (HOS) network, an optical/electronic HOS network, and an all-electronic switching network. They evaluate and compare all three networks with regard to performance and power consumption via an event-driven simulator.

Optimal routing for hybrid optical switching networks under traffic demand uncertainties

Based on the Hybrid Optical Switching(HOS) networks,combining the advantages of Optical Circuit Switching(OCS) and Optical Burst Switching(OBS),a new method was proposed to address the problem of designing optimization routing for HOS networks under traffic demand uncertainties.Given the number of wavelength,this paper first reserved several wavelengths for OBS;and then constructed an OCS virtual topology;finally,the reserved wavelengths and optimization method were adopted to achieve OBS routing.In this paper,the network performance optimization metrics is minimizing packet loss probability.The simulation results show that,in the case of the given number of wavelength,this optimal routing method can more effectively reduce packet loss probability of the whole network than the shortest path routing;at the same time,in order to describe the uncertainty of traffic,the authors introduced the uncertainty factor.With the uncertainty factor decreasing,the optimal routing method has less packet loss probability.

一种新的混合光交换网络组建方法

一种新的混合光交换网络组建方法