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We compare the performance of a digital receiver operating with both a fixed and adaptive decision threshold in response to gain transients arising from network operation of an optically gain-clamped erbium-doped fiber amplifier. An optical burst switching link, based on a recirculating transmission loop, is used to study the effect of transients accumulated across a number wavelength-routing nodes linked by amplified fiber spans where bursts are added and dropped at each node. The use of an adaptive threshold reduces the amount of optical feedback required by a factor of 6 and, in some cases, allows for unclamped operation. 相似文献
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S. Appathurai Y. Benlachtar A. Del Duce M. Düser G. Gavioli R. Lao L. Meflah B. Puttnam R. Waegemans P. M. Watts A. Zapata V. Mikhailov S. Savory B. Thomsen R. I. Killey P. Bayvel 《BT Technology Journal》2006,24(3):144-159
New dynamic optical switching technologies and adaptive transmission techniques will allow increased capacity and flexibility
in future core and metro networks. The Optical Networks Group at UCL has carried out research focused on these areas, in collaboration
with industry and other university research groups, for over a decade. In this paper, the technical challenges to be overcome
in implementing dynamic, high-capacity networks are discussed, and recent results of the group’s work are presented. New network
architectures based on wavelength-routing and optical burst switching have been proposed and analysed, and the experimental
demonstration of burst switching using fast wavelength-tunable lasers is described. High-capacity dense wavelength division
multiplexed transmission systems, using advanced regeneration and equalisation techniques, have been studied, both theoretically,
and experimentally using a dynamically reconfigurable recirculating fibre loop. Research results on advanced optical signal
formats, all-optical 3R regeneration at 40 Gbit/s channel rates, adaptive analogue and digital electronic processing techniques
and optical finite impulse response equalisation are presented. Finally, the development of optical performance monitoring
technology, a key component of future all-optical networks, is described. The paper concludes with a prediction of future
trends in optical communications research. 相似文献
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David Puttnam 《Digital Creativity》2013,24(4):197-204
Space becomes place through a rich interplay of actors, actions and associations, and techniques drawn from performance, gaming and architecture are well adapted to helping us understand and design for complex environments. Our experience working with masters-level interaction design students in the ATELIER project has demonstrated that these ‘cross-dressing’ techniques can create a climate of awareness in which inspirational learning and innovative design can occur. 相似文献
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