A Review of DSP-Based Enabling Technologies for Cloud Access Networks

Abstract

Optical access networks, metro networks and mobile data networks are facing rapidly evolving demands, not only is it essential to satisfy the unyielding need for increased user bandwidths, but future networks must also support the growing wide variation in traffic dynamics and characteristics, due to various emerging technologies, such as cloud-based services, the Internet-of-Things (IoT) and 5G mobile systems, and due to growing trends, such as the proliferation of mobile devices and the rapidly increasing popularity of video-on-demand services. To be cost-effective and commercially sustainable, future optical networks must offer features, such as, dynamic reconfigurability, highly efficient use of network resources, elastic bandwidth provisioning with fine granularity, network sliceabilty and software defined networking (SDN). To meet these requirements Cloud Access Networks (CANs) are proposed which require a number of flexible, adaptive and reconfigurable networking elements. By exploiting digital signal processing (DSP) we have proposed a digital orthogonal filter-based multiplexing technique to implement CANs with multiplexed, independent optical channels at the wavelength, sub-wavelength, and orthogonal sub-band levels. This paper reviews the overall CAN concept, the operating principles of the various CAN network elements and presents an overview of the research work we have undertaken in order to validate the feasibility of the proposed technologies which includes real-time DSP-based demonstrations.

Timing Jitter Analysis and Mitigation in Hybrid OFDM-DFMA PONs

“…T O SATISFY the rigorous requirements imposed by future 5G networks such as ultra-reliable low latency connections, massive device connectivity and the ever-increasing demands for higher capacity, all delivered in a cost and energyefficient manner [1], [2], it is essential to offer elastic, flexible, dynamic and high-performance optical networks which seamlessly converge the traditional mobile and fixed networks into cloud access networks (CANs) [3]. These converged networks can thus offer greater network bandwidth utilisation efficiency and flexibility via features such as shared, on-demand bandwidth provision [4], [5].…”