Topic
Optical Transport Network
About: Optical Transport Network is a research topic. Over the lifetime, 6055 publications have been published within this topic receiving 85783 citations.
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17 Mar 2002TL;DR: In this article, it was shown that integrated IP/OL restoration of span failures can give substantial benefits over restoration by either layer alone, depending on the single or dual router office architectures and pre and post-failure IP-layer link utilization levels.
Abstract: Even though transport of an equivalent amount of bandwidth at the IP layer is much more expensive than at the optical layer, it is not universally true that restoration of span failures is less expensive when provided at the optical layer. Some critical factors that determine this are single or dual router office architectures and pre and post-failure IP-layer link utilization levels. Furthermore, it was shown that integrated IP/OL restoration can give substantial benefits over restoration by either layer alone.
23 citations
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TL;DR: Simulations show that the proposed optical switch requires a low switching voltage down to 3V and can operate at frequencies in the MHz range and pave the way towards novel optical components that electromechanically manipulate light in both the horizontal and the vertical direction in photonic circuits.
Abstract: Optical switches connect optical circuits, and route optical signals in networks. Nano-electromechanical systems can in principle enable compact and power-effective switches that can be integrated in photonic circuits. We proposed an optical switch based on four coupled waveguides arranged in three-dimensional configuration. The switching operation is controlled by a cantilever displacement of only 55 nm. Simulations show that our proposed device requires a low switching voltage down to 3V and can operate at frequencies in the MHz range. Our results also pave the way towards novel optical components that electromechanically manipulate light in both the horizontal and the vertical direction in photonic circuits.
23 citations
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05 Jun 2011
TL;DR: The benefits, in terms of power saving, provided by the TDS transport architecture are shown by performing a comprehensive overview of the different core network architectures and comparing the power consumption obtained in the different cases.
Abstract: Reducing the Internet power consumption will become a challenging issue, since the Internet is expected to face a high growth in terms of traffic requirements. Simply scaling the network architecture, thus increasing its energy consumption, proportionally to this growth would not be a practical solution. Various energy-efficient approaches have been considered, typically consisting in a dual-layer network architecture through the introduction of an all-optical transport network layer, as relevant power savings can be reached thanks to optical technologies. Optical switching especially allows to significantly reduce the quantity of high power-requiring optical/electronic/optical conversions and electronic processing operations. A further improvement can be obtained with Time Driven Switching (TDS), a technique which allows to switch "fractions" of wavelengths directly in the optical domain exploiting the time-coordination of all network components. In this paper we show the benefits, in terms of power saving, provided by the TDS transport architecture, by performing a comprehensive overview of the different core network architectures and comparing the power consumption obtained in the different cases. With such an optical transport technology, power savings of more than 40% are demonstrated with respect to existing architectures.
23 citations
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18 Sep 2011TL;DR: The concept of data rate adaptive optical packet networks and its network advantages in terms of queuing delay reduction are proposed and demonstrated.
Abstract: We propose and demonstrate a rate-adaptive burst-mode coherent receiver with ultra fast convergence time. We propose the concept of data rate adaptive optical packet networks and show its network advantages in terms of queuing delay reduction.
23 citations
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02 Oct 2003TL;DR: In this article, a variable bandwidth tunable optical spectral filtering device and associated method for selectively directing a portion of a wavelength multiplexed input signal, entering through one or more optical fibers, into one or many output signals provided to one or multiple optical fibers and/or electronic outputs is described.
Abstract: We describe a variable bandwidth tunable optical spectral filtering device and associated method for selectively directing a portion of a wavelength multiplexed input signal, entering through one or more optical fibers, into one or more output signals provided to one or more optical fibers and/or electronic outputs. The optical filtering is accomplished using free-space diffractive wavelength de-multiplexing optics combined with a fixed (permanent) patterned structure located in the spectrally dispersed image plane. The structure can direct a selected spectral portion of the optical signal to one or more separate outputs, such as an optical fiber or power detector. A single active element in the optical path is used to spatially shift, or steer, the entire input spectrum at the dispersed spectral image plane, to control the portion of the input spectrum illuminating specific features on the permanent patterned structure. In one preferred embodiment, a device with a fixed selective area triangular shaped tilted reflective facet on a flat reflective surface is constructed such that the light reflected off the flat reflective surface and off the triangular reflective facet are selectively multiplexed back and directed to different output fiber ports. Inputs at different angles of incidence on the reflective structures may be deflected by the same structures to different output port fiber ports. A reconfigurable variable-bandwidth tunable optical add/drop multiplexing device is constructed using such a filtering device and an application of such an add/drop multiplexing in a optical transport network is demonstrated.
23 citations