Ian H. White

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0163-6804/99/$10.00 © 1999 IEEE avelength-division multiplexing (WDM) is currently being deployed in telecommunications networks in order to satisfy the increased demand for capacity brought about by both narrowband services and new broadband services such as high-speed Internet. While it is thought that WDM will ultimately evolve to interconnected rings or(More)
One of the major concerns of IPTV network deployment is channel switching (or zapping) delay. This delay can add up to two seconds or more, and its main culprits are synchronisation and buffering. By analysing an extensive dataset comprising 255 thousand users, 150 TV channels, and covering a 6-month period we have observed that most channel switching(More)
We report the first experimental demonstration of a monolithically integrated hybrid dilated 2×2 modular optical switch using Mach-Zehnder modulators as low-loss 1×2 switching elements and short semiconductor optical amplifiers to provide additional extinction and gain. An excellent 40 dB cross-talk/extinction ratio is recorded with data-modulated(More)
Single-wall carbon nanotubes (SWNTs) are at the center of nanotechnology research. Their nonlinear optical behavior makes them promising for applications in ultrafast photonics. SWNTs are indeed good saturable absorbers, i.e., they are transparent to high-intensity light, with ultrafast recovery time. Saturable absorbers must always keep a delicate balance(More)
Layered asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) with high spectral efficiency is proposed in this paper for optical wireless transmission employing intensity modulation with direct detection. In contrast to the conventional ACO-OFDM, which only utilizes odd subcarriers for modulation, leading to an obvious(More)
One of the major concerns of IPTV network deployment is channel change delay (also known as zapping delay). This delay can add up to 2 s or more, and its main culprits are synchronisation and buffering of the media streams. Proving the importance of the problem is the already significant amount of literature addressing it. We start this paper with a survey(More)
We present a local area sub-network design avoiding optical buffering, bit level synchronization and regeneration. Using currently available components we calculate acceptable utilisation when scalability is limited to local, system, storage and desk area networks. The architecture draws upon well-understood computer networking concepts, and uses wavelength(More)
Power density and cooling issues are limiting the performance of high performance chip multiprocessors (CMPs), and off-chip communications currently consume more than 20% of power for memory, coherence, PCI, and Ethernet links. Photonic transceivers integrated with CMPs are being developed to overcome these issues, potentially allowing low hop count(More)