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Author

Mike J. O'Mahony

Bio: Mike J. O'Mahony is an academic researcher from University of Essex. The author has contributed to research in topics: Packet switching & Optical burst switching. The author has an hindex of 21, co-authored 83 publications receiving 2400 citations.


Papers
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Journal ArticleDOI
TL;DR: The concatenation performance of an optical cross-connect node performing reconfigurable wavelength routing utilising an arrayed waveguide grating and all-optical tuneable wavelength converters is presented.
Abstract: The concatenation performance of an optical cross-connect node performing reconfigurable wavelength routing utilising an arrayed waveguide grating and all-optical tuneable wavelength converters is presented. Error-free transmission after concatenation of 30 such nodes is demonstrated.

4 citations

Journal ArticleDOI
TL;DR: A novel all-optical packet-switched architecture exhibiting low loss and reduced complexity whilst providing wavelength routing, optical buffering and add/drop capabilities is presented.
Abstract: A novel all-optical packet-switched architecture exhibiting low loss and reduced complexity whilst providing wavelength routing, optical buffering and add/drop capabilities is presented. The node is demonstrated to impose less than 1.5 dB power penalty on 2.5 Gbit/s payloads for routing, buffering and adding to or dropping from a local tributary.

4 citations

Journal ArticleDOI
TL;DR: The authors describe an architecture for an all-optical packet-switched routing node which eliminates the detrimental effects of intra-band crosstalk arising from filterless wavelength converters employing cross-gain modulation in semiconductor optical amplifiers.
Abstract: The authors describe an architecture for an all-optical packet-switched routing node which eliminates the detrimental effects of intra-band crosstalk arising from filterless wavelength converters employing cross-gain modulation in semiconductor optical amplifiers. A dual-stage wavelength conversion scheme and an arrayed-waveguide grating for optical routing demonstrates < 0.9 dB power penalty for 800 Mbit/s payloads.

4 citations

Proceedings ArticleDOI
19 Apr 2004
TL;DR: The proposed solution is based on the deployment of high capacity optical infrastructure whilst taking advantage of recent developments in optical networking technologies to provide a physical infrastructure able to fulfill the Grid application requirements and make efficient use of network resources.
Abstract: This work presents a novel solution towards a long-reach intelligent infrastructure for Grid networking. The proposed solution is based on the deployment of high capacity optical infrastructure whilst taking advantage of recent developments in optical networking technologies. Optical burst switching and a user network interface utilizing fast tunable optical technologies provide a physical infrastructure able to fulfill the Grid application requirements and make efficient use of network resources. Furthermore a control and management plane based on extensions of existing artifacts offers peer-to-peer distributed networking to enable Grid services.

4 citations

Journal ArticleDOI
TL;DR: Predictable developments in optical components, sub-systems and systems and their consequences on the architecture and performances of the networks are analysed and specific interest is focused on the various parts of the network structure.
Abstract: On the basis of Europeanist project results in the field of photonics, theoptimist thematic network has produced a roadmap for optical communications This work is described in the present article which provides scenarios for the evolution of the optical network in the coming 10 years Predictable developments in optical components, sub-systems and systems and their consequences on the architecture and performances of the networks are analysed Specific interest is focused on the various parts of the network structure namely the access, the metropolitan area, the wide area and the global networks Technical documents elaborated by theoptimist consortium and minutes fromist workshops can be found on the website http://wwwist-optimistorg/[1] They constitute a main source for further information

4 citations


Cited by
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Journal ArticleDOI
TL;DR: This paper is aimed to demonstrate a close-up view about Big Data, including Big Data applications, Big Data opportunities and challenges, as well as the state-of-the-art techniques and technologies currently adopt to deal with the Big Data problems.

2,516 citations

Proceedings Article
01 Jan 2003

1,212 citations

Journal ArticleDOI
TL;DR: To support bursty traffic on the Internet (and especially WWW) efficiently, optical burst switching (OBS) is proposed as a way to streamline both protocols and hardware in building the future gener...
Abstract: To support bursty traffic on the Internet (and especially WWW) efficiently, optical burst switching (OBS) is proposed as a way to streamline both protocols and hardware in building the future gener...

674 citations

Journal ArticleDOI
TL;DR: An estimation of the global electricity usage that can be ascribed to Communication Technology between 2010 and 2030 suggests that CT electricity usage could contribute up to 23% of the globally released greenhouse gas emissions in 2030.
Abstract: This work presents an estimation of the global electricity usage that can be ascribed to Communication Technology (CT) between 2010 and 2030. The scope is three scenarios for use and production of consumer devices, communication networks and data centers. Three different scenarios, best, expected, and worst, are set up, which include annual numbers of sold devices, data traffic and electricity intensities/efficiencies. The most significant trend, regardless of scenario, is that the proportion of use-stage electricity by consumer devices will decrease and will be transferred to the networks and data centers. Still, it seems like wireless access networks will not be the main driver for electricity use. The analysis shows that for the worst-case scenario, CT could use as much as 51% of global electricity in 2030. This will happen if not enough improvement in electricity efficiency of wireless access networks and fixed access networks/data centers is possible. However, until 2030, globally-generated renewable electricity is likely to exceed the electricity demand of all networks and data centers. Nevertheless, the present investigation suggests, for the worst-case scenario, that CT electricity usage could contribute up to 23% of the globally released greenhouse gas emissions in 2030.

644 citations

Journal ArticleDOI
TL;DR: Some of the critical issues involved in designing and implementing all-optical packet-switched networks are presented.
Abstract: The current fast-growing Internet traffic is demanding more and more network capacity every day. The concept of wavelength-division multiplexing has provided us an opportunity to multiply network capacity. Current optical switching technologies allow us to rapidly deliver the enormous bandwidth of WDM networks. Photonic packet switching offers high-speed, data rate/format transparency, and configurability, which are some of the important characteristics needed in future networks supporting different forms of data. In this article we present some of the critical issues involved in designing and implementing all-optical packet-switched networks.

637 citations