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.
Highlights
Today’s communication networks are increasingly struggling to support the growing demands of emerging network services and traffic, such as the higher data rates, drastically increased the number of connections and ultra-low latency requirements of 5G
It is predicted, that to meet traffic growth demands in the future, operators must offer multi-Gb/s internet connection speeds [3], but provision of multi-Gb/s connections is highly challenging to achieve in a cost-effective manner as subscribers are not prepared to pay significantly increased subscription rates, operators are facing the dilemma of the decoupling effect between traffic growth and revenue growth
Evolve to offer advanced, highly agile, dynamically reconfigurable architectures that support features, such as elastic bandwidth allocation, network slicing and software defined networking (SDN) control. These dynamic networks [4,5] would allow operators to instantly respond to changing traffic demands, offering network features, such as elastic connectivity tailored to the end users’ prevailing needs, automatic network reconfiguration based on identified traffic patterns and provision of dedicated virtual networks with service critical characteristics, such as security and latency
Summary
Today’s communication networks are increasingly struggling to support the growing demands of emerging network services and traffic, such as the higher data rates, drastically increased the number of connections and ultra-low latency requirements of 5G. Evolve to offer advanced, highly agile, dynamically reconfigurable architectures that support features, such as elastic bandwidth allocation, network slicing and SDN control These dynamic networks [4,5] would allow operators to instantly respond to changing traffic demands, offering network features, such as elastic connectivity tailored to the end users’ prevailing needs, automatic network reconfiguration based on identified traffic patterns and provision of dedicated virtual networks with service critical characteristics, such as security and latency.
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