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In summary, we have proposed and demonstrated the feasibility of a 60-km extendedreach PON system for broadband access in rural areas using a dual-fibre architecture. In the proposed system, each subscriber is serviced by two fibres with symmetric upstream and downstream traffic at a data rate up to 2.5 Gb/s at 1550 nm. The proposed scheme uses purely passive components in the filed, while providing...
We demonstrate a new extended-reach GPON for rural areas using distributed Raman amplification and an SOA. Symmetric 2.5-Gb/s bidirectional transmission is achieved for 32 subscribers over 60-km reach, without using an active extender.
We compare the abilities of photonic and electronic technologies for improving energy efficiency of the Internet. It is not clear whether photonic signal processing technologies will provide a pathway to improving Internet energy efficiency.
We show that packet delay variance of constant bit rate traffic in extended-reach GPONs is larger than standard reach GPONs. We describe an allocation algorithm that produces zero delay variance for constant bit rate traffic.
We provide an overview of the capabilities and limitations of slow light optical buffers. A number of fundamental waveguide properties such as loss and dispersion severely limit the opportunities for practical slow light optical buffering.
A new energy consumption model of IPTV storage and distribution provides insights into the optimal design of a VoD network. Energy consumption is minimized by replicating popular program material on servers close to users.
A new extended-reach GPON for rural areas using distributed Raman amplifiers is proposed and demonstrated. Symmetric 2.5-Gb/s bidirectional transmission is achieved for 32 subscribers over 60-km reach, without using any active extender.
A sleep mode protocol for ONUs is proposed and its impact on re-activation procedures for GPON is examined. The new protocol does not disrupt in-service ONUs.
This paper presents an overview of research aimed at understanding the greenhouse impact of the transmission, switching, and data storage equipment in the Internet, and at devising approaches to minimizing this energy consumption.
We present a model of energy consumption in IP networks. Using this model, we identify energy ldquohotspotsrdquo and estimate how energy consumption will grow with increasing network capacity. Todaypsilas Internet uses less than 1% of the available electricity supply. However, network energy consumption could grow substantially as access rates increase.
We present a new analysis of the modulation bandwidth of nanocavity light emitters. The modulation bandwidth is enhanced by the Purcell effect, but only if the device is operated below threshold. The maximum Purcell-enhanced 3-dB bandwidth scales inversely with the modal volume.
We present a new analysis of the modulation bandwidth of nanocavity light emitters. The modulation bandwidth is enhanced by the Purcell effect, but only if the device is operated below threshold. The maximum Purcell-enhanced 3-dB bandwidth scales inversely with the modal volume.
A tunable transmitter using a self-seeded RSOA, which allows flexible operation of optical virtual private networking (OVPN) in WDM PON is proposed. We successfully demonstrate the use of this transmitter for an initial implementation of OVPN.
The issue of energy consumption in ICT equipment is attracting increasing attention. This paper presents a model of energy consumption in the Internet and uses this model to estimate how Internet energy consumption will scale with increasing network traffic.
We present a new approach for greenfield and incremental optical network capacity allocation under dynamic lightpath demands. The method can improve lightpath blocking performance by one or two orders of magnitude compared to conventional designs.
A collection of slides from the authorpsilas conference presentation on "Optical packet-switched WDM networks: a cost and energy perspective" is given.
We present a comparison of energy consumption of access networks. We consider passive optical networks, fiber to the node, point-to-point optical systems and WiMAX. Optical access technologies provide the most energy-efficient solutions.
We simulate the rate equations of nanocavity lasers, introducing gain compression of both the stimulated and spontaneous emission. The resonance frequency and damping are simultaneously enhanced by the Purcell effect, greatly limiting the modulation bandwidth.
We report a low-cost and bandwidth-efficient scheme for delivering video services to customers over a repeater-based optical access network. Video channels are locally regenerated and delivered on a single wavelength channel together with downstream data.
The energy consumption of the Internet is growing exponentially. We examine the potential of photonic switching to reduce energy consumption by determining the contribution of cross connects and buffers to the total energy consumption of the Internet.
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