Recently, Ethernet Passive opticalnetworks (EPON) is being deployed widely as the next generation broadband access networks due to the convergence of low cost Ethernet equipment and low cost fiber infrastructure. Bec...
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Recently, Ethernet Passive opticalnetworks (EPON) is being deployed widely as the next generation broadband access networks due to the convergence of low cost Ethernet equipment and low cost fiber infrastructure. Because of the use of shared transmission media between all users, an efficient dynamic bandwidth allocation (DBA) is necessary to enable the quality of service (QoS) in EPON. However, to receive guaranteed QoS, end users first have to sign the contract called Service Level Agreement (SLA) with service provider in which specifies the QoS performances of the provider has to promise as well as the obligations the end users have to obey. Therefore, the central issue of QoS support in EPON is the appropriate dynamic bandwidth allocation scheme that makes sure the SLAs can be exactly fulfilled. According to the negotiation fashions, the SLA can be static or dynamic. Based on current standardized EPON architecture, most studies of the DBA schemes have only focused on achieving static SLAs, and the DBA for dynamic SLAs is rarely discussed. This paper firstly addresses this issue with an extension of EPON framework that supports dynamic SLAs negotiation, and further proposes a dynamic bandwidth allocation (DBA) scheme to fulfill the dynamic SLAs. Detailed simulation experiments are also conducted to study the performance and validate the effectiveness of the proposed solution.
optical Grid has been thought as a promising technology to support large-scale data-intensive distributed applications. For such a system with so many heterogeneous resources involved, faults seem to be inevitable. A ...
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optical grid, the integrated computing environment based on opticalnetwork, is expected to be an efficient infrastructure to support advanced data-intensive grid applications. In optical grid, the faults of both comp...
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We present simulation of electrical joint equalization including both DFE and Viterbi equalizer for PMD compensation in direct-detection PDM systems. The benifit of utilizing joint equalizer for dynamic polarization c...
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ISBN:
(纸本)0858258072
We present simulation of electrical joint equalization including both DFE and Viterbi equalizer for PMD compensation in direct-detection PDM systems. The benifit of utilizing joint equalizer for dynamic polarization control is also investigated.
An simple method to fabricate phase shift in fiber grating is proposed and demonstrated. The phase shift is introduced by cutting the grating and fusion splice. Experimental results are given. Theoretical analysis is ...
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An simple method to fabricate phase shift in fiber grating is proposed and demonstrated. The phase shift is introduced by cutting the grating and fusion splice. Experimental results are given. Theoretical analysis is presented and factors affecting the performance is expatiated.
The wavelength-division multiplexing passive opticalnetwork (WDM-PON) is considered to be a promising method to overlay or upgrade the existing optical access network. A centralized WDM-PON in which the downstream wa...
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The shape of the Web in terms of its graphical structure has been a widely interested topic. Two graphs, Bow Tie and Daisy, have stood out from previous research. In this work, we take a different approach, by viewing...
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ISBN:
(纸本)9781605580852
The shape of the Web in terms of its graphical structure has been a widely interested topic. Two graphs, Bow Tie and Daisy, have stood out from previous research. In this work, we take a different approach, by viewing the Web as a hierarchy of three levels, namely page level, host level, and domain level. Such structures are analyzed and compared with a snapshot of Chinese Web in early 2006, involving 830 million pages, 17 million hosts, and 0.8 million domains. Some interesting results have emerged. For example, the Chinese Web appears more like a teapot (with a large size of SCC, a medium size of IN and a small size of OUT) at page level than the classic bow tie or daisy shape. Some challenging phenomena are also observed. For example, the INs become much smaller than OUTs at host and domain levels. Future work will tackle these puzzles.
A 100-Gb/s high-speed optical transmitter is proposed and experimentally demonstrated. Based on frequencyquadrupling technique, two sub-channels with a fixed 50-GHz spacing are obtained from one laser source. Using re...
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86 Gbit/s hybrid polarization multiplexed OOK/DPSK signal is generated and transmitted at the same wavelength. Clear eye diagrams of demultiplexed OOK and DPSK signals are obtained after transmission over a 106.5 km S...
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