PCOI: Packet Classification‐Based Optical Interconnect for Data Centre Networks

Rab Nawaz Jadoon,Ghulam Mujtaba,Mohsin Fayyaz,Muhammad Amir Khan,Wuyang Zhou

doi:10.1155/2020/2903157

Abstract

To support cloud services, Data Centre Networks (DCNs) are constructed to have many servers and network devices, thus increasing the routing complexity and energy consumption of the DCN. The introduction of optical technology in DCNs gives several benefits related to routing control and energy efficiency. This paper presents a novel Packet Classification based Optical interconnect (PCOI) architecture for DCN which simplifies the routing process by classifying the packet at the sender rack and reduces energy consumption by utilizing the passive optical components. This architecture brings some key benefits to optical interconnects in DCNs which include (i) routing simplicity, (ii) reduced energy consumption, (iii) scalability to large port count, (iv) packet loss avoidance, and (v) all-to-one communication support. The packets are classified based on destination rack and are arranged in the input queues. This paper presents the input and output queuing analysis of the PCOI architecture in terms of mathematical analysis, the TCP simulation in NS2, and the physical layer analysis by conducting simulation in OptiSystem. The packet loss in the PCOI has been avoided by adopting the input and output queuing model. The output queue of PCOI architecture represents an M/D/32 queue. The simulation results show that PCOI achieved a significant improvement in terms of throughput and low end-to-end delay. The eye-diagram results show that a good quality optical signal is received at the output, showing a very low Bit Error Rate (BER).

Highlights

Data Centre Networks (DCNs) are indispensable entities that enable many of today’s services like social networking, search engines, e-mail, and so on
Work e modelling of optical data centres is very important, as it helps in making important decisions about their performance
It is very important to consider at design time of optical data centres which optical components to use. e choice of optical components directly affects the quality of received signal

Summary

Introduction

DCNs are indispensable entities that enable many of today’s services like social networking, search engines, e-mail, and so on. E signal degradation due to optical components can introduce Bit Error Rate (BER) in optical interconnects. Couplers cause reduction in amplitude, DMLs and VCSELs cause change in shape of signal, FDLs cause delay in bits, FBGs cause addition of noise, and SOAs introduce spikes in the optical signal. Use of DML reduces the cost of communication system as it eliminates the need for separate modulator They introduce nonlinear changes in shape of optical signal which need to be compensated. (1) Mathematical analysis of the input and output queuing is performed (2) Simulation of TCP protocol (3) Eye-diagram analysis is conducted to measure the signal degradation and BER at physical layer.

Related Work

Findings

Conclusions and Future