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.

FWM wavelength conversion with pump suppression

Abstract: A novel scheme that significantly improves the performance of FWM wavelength conversion is proposed and demonstrated. The scheme offers substantial pump suppression and OSNR improvement and intended for ultra-fast wavelength routing and packet switching applications.

All-optical routing using a 12×12 passive InP wavelength selective router and tuneable wavelength conversion

Abstract: All-optical routing of 2.5 Gbit/s WDM signals across two cascaded optical cross connects (OXCs) with a penalty of only 0.6 dB has been demonstrated using tuneable wavelength converters and a passive WDM router.

Buffering Strategies for Optical Packet Switches

Abstract: Recently, many optical packet switches have been proposed, to overcome to potential problems of future large electronic switch cores. The need for buffering arises due to the unscheduled nature of packet arrivals at the switch inputs,and severalstrategies have evolved to implement this buffering. Examples of these are discussed in this paper, including the use of wavelength to assist in contention resolution; where contending packets can usually be transmitted on different wavelengths. Also, the implementation of multi-stage buffers is discussed, using differing technologies, both with and without deflection routing.

Concatenation performance of optical packet switches that incorporate wavelength converters based on four-wave mixing in semiconductor optical amplifiers

Abstract: Four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs) has been acknowledged as a useful wavelength conversion technique especially due to its ability to convert sequences of ultra fast pulses but also simultaneously a number of wavelengths. An analysis is used to investigate the concatenation performance of optical packet switch that incorporate wavelength or waveband converters based on FWM in SOAs.

On prioritization and optimal buffer management in photonic packet switching nodes

Abstract: The effects of prioritization and buffer sharing for packet switching are analyzed analytically. An adaptive methodology is proposed and evaluated for maximizing switch throughput by optimally managing the usually restricted buffer depth of photonic nodes.

Optical burst switching (OBS) - a new paradigm for an optical Internet

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...

On Global Electricity Usage of Communication Technology: Trends to 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.

Advances in photonic packet switching: an overview

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.