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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16 Oct 1998TL;DR: In this paper, the authors propose an approach to dynamically assign the number of wavelengths at originating and terminating optical signal access apparatus (OSA) to handle variations in network traffic, by checking the occupancy level (or other parameters) of data buffers and determining therefrom the amount of optical signals that should be allocated to handle network traffic from those buffers.
Abstract: An optical signal access apparatus responds to variations in network traffic by dynamically assigning the number of wavelengths at originating and terminating optical signal access apparatus. A controller of an optical signal access apparatus monitors network traffic by checking the occupancy level (or other parameters) of data buffers and determines therefrom the number of optical signals that should be allocated to handle the network traffic from those buffers. When the optical signal access apparatus is part of a router it can be used to control traffic at the router as well as on the links between the routers of an optical network.
41 citations
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TL;DR: In this paper, the authors describe a space-variant optical system and apply it to the case of an optical interconnection network, where the so-called inverse perfect shuffle interconnection is shown in one and two dimensions.
Abstract: The noninteraction of photons makes free-space optics for optical interconnections an important asset to the digital optical computer. In this paper, we describe a space-variant optical system and apply it to the case of an optical interconnection network. As experimental proof of the device's merit, the so-called inverse perfect shuffle interconnection network is shown in one and two dimensions. Considerations regarding the demonstrated system's limitations are also presented.
41 citations
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19 Oct 2003TL;DR: The results show that backup-multiplexing improves the utilization of channels but requires significant computing capacity under a fixed computing capacity budget, and is useful in cases where there is little time disjointness among SLDs.
Abstract: This article addresses the problem of defining working and protection paths for scheduled lightpath demands (SLDs) in an optical transport network. An SLD is a demand for a set of lightpaths (connections), defined by a tuple (s, d, n, /spl alpha/, /spl omega/), where s and d are the source and destination nodes of the lightpaths, n is the number of requested lightpaths and /spl alpha/, /spl omega/ are the set-up and tear-down dates of the lightpaths. The problem is formulated as a combinatorial optimization problem where the objective is to minimize the number of channels required to instantiate the lightpaths. Two techniques are used to achieve this goal: channel reuse and backup-multiplexing. The former consists of assigning the same channel (either working or spare) to several lightpaths, provided that these lightpaths are not simultaneous in time. The latter consists of sharing a spare channel among multiple lightpaths. A spare channel cannot be shared if two conditions hold: a) the working paths of these lightpaths have at least one span in common and b) these lightpaths are simultaneous in time. In the other cases, the spare channel can be shared. We propose a simulated annealing (SA) based algorithm to find approximate solutions to this optimization problem since finding exact solutions is computationally intractable. The results show that backup-multiplexing improves the utilization of channels but requires significant computing capacity. Under a fixed computing capacity budget, the technique is useful in cases where there is little time disjointness among SLDs.
40 citations
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20 Mar 2016TL;DR: A 260-meter security free-space optical data transmission link using orbital angular momentum beams multiplexing and 16-ary quadrature amplitude modulation signals is experimentally demonstrated.
Abstract: We experimentally demonstrate a 260-meter security free-space optical data transmission link using orbital angular momentum (OAM) beams multiplexing and 16-ary quadrature amplitude modulation (16-QAM) signals. We study the beam wandering, power fluctuation, channel crosstalk, bit-error rate (BER) performance, and link security.
40 citations
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TL;DR: Optical dynamics requirement for packet-over-WDM networks is analyzed, yielding multiterabit/second throughput capability by employing submicrosecond switching technology.
Abstract: Optical dynamics requirement for packet-over-WDM networks is analyzed. Optimization among optical switching speed, global resource availability, and local queuing considerations is performed, yielding multiterabit/second throughput capability by employing submicrosecond switching technology.
40 citations