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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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Journal ArticleDOI
TL;DR: This paper presents an optimization framework to optimally plan and deploy a survivable hybrid FiWi network, where traffic from an affected optical network unit (ONU) can be effectively rerouted to backup ONUs through wireless connections in the event of a distribution fiber failure.
Abstract: —Hybrid fiber-wireless (FiWi) networks, which benefit from high bandwidth and ubiquitous access of optical and wireless networks, have been identified as a promising technology candidate for next-generation broadband access. As various component/fiber failures may occur in hybrid FiWi networks, thus affecting huge numbers of end users, survivability has become one of the key important deployment considerations in such networks. This paper focuses on developing optimal network planning strategies to achieve survivable hybrid FiWi networks. In particular, to address the additional cost involved in deploying backup fibers in previously proposed redundancy strategies against distribution fiber failures, we propose the use of wireless routing through the ubiquitous wireless coverage of end users in a hybrid FiWi network. We present an optimization framework to optimally plan and deploy a survivable hybrid FiWi network, where traffic from an affected optical network unit (ONU) can be effectively rerouted to backup ONUs through wireless connections in the event of a distribution fiber failure. However, focusing only on the resilience of a network without considering its cost, and ignoring the resultant capacity, latency, and coverage under normal and protection operating conditions, is impractical. Our proposed framework therefore ensures maximum end-user coverage whilst satisfying survivability, connectivity, delay, and capacity constraints of the network, by optimizing the placement of passive optical splitters, ONUs, and wireless routers in conjunction with fiber and wireless connections. Moreover, we demonstrate the feasibility of our framework in the context of an urban deployment under different deployment scenarios. In particular, our results provide insight into how survivable FiWi networks can be deployed without compromising on the latency, coverage, and capacity requirements of such networks.

31 citations

Proceedings ArticleDOI
06 Mar 2005
TL;DR: A 226 node, 128 channel Raman gain based DWDM system being deployed by Verizon GNI to create a nationwide automated optical network carrying 10 Gb/s traffic and offering 40 Gb-s traffic capability is presented.
Abstract: We present a 226 node, 128 channel Raman gain based DWDM system being deployed by Verizon GNI to create a nationwide automated optical network carrying 10 Gb/s traffic and offering 40 Gb/s traffic capability.

31 citations

Proceedings ArticleDOI
11 May 2003
TL;DR: Simulation results show that a number of data channel scheduling algorithms that use burst segmentation and fiber delay lines can effectively reduce the packet loss probability compared to existing scheduling techniques.
Abstract: Optical burst switching is a promising solution for terabit transmission of IP data bursts over WDM networks. One of the key components in the design of optical burst-switched nodes is the development of channel scheduling algorithms that can efficiently handle data burst contentions. Currently, traditional scheduling techniques use wavelength conversion and buffering to resolve burst contention. In this paper, we reduce packet losses by proposing a number of data channel scheduling algorithms that use burst segmentation and fiber delay lines (FDLs). The proposed scheduling algorithms are classified based on the placement of the FDL buffers in the optical burst-switched node and are referred to as delay-first or segment-first schemes. Simulation results show that these algorithms can effectively reduce the packet loss probability compared to existing scheduling techniques.

31 citations

Journal ArticleDOI
TL;DR: A novel flat and scalable data center network (DCN) architecture based on fast (nanosecond) distributed buffer-less optical switches and efficient optical flow control and a preliminary experimental validation of the DCN is provided by using a 4 × 4 optical switch prototype.
Abstract: We propose a novel flat and scalable data center network (DCN) architecture based on fast (nanosecond) distributed buffer-less optical switches and efficient optical flow control. The proposed DCN architecture scales as the square of the port count of the optical switches. In order to investigate the performance of the proposed architecture, the system operation of an electronic Top-of-the-Rack (ToR) and the optical switch is fully described, and all functional subsystems are modeled. The performance in terms of DCN scalability, average latency, packet loss, normalized throughput of the network, and electronic buffer size of the ToR is numerically assessed for a medium-size data center supporting 5760 servers and a large-size data center connecting 100 000 servers. Considering a traffic pattern with high inter-cluster (40%) traffic distribution and buffer size of 40 KB, the results report an end-to-end latency of less than 8.1 $\mu\text{s}$ (including retransmission) and a packet loss $ under a load of 0.4 for the large-size data center. Moreover, we provide a preliminary experimental validation of the DCN by using a 4 $\times$ 4 optical switch prototype showing dynamic switching at 40 Gb/s and error-free operation with less than 1.5 dB penalty for the longest path.

31 citations

Proceedings ArticleDOI
R.W. Tkach1, J. A. Nagel1, J. Strand1
01 Jan 1998
TL;DR: Network management is complicated by transparency in that there is no simple way to determine in what part of the network the degradation occurred, and monitoring optical power or signal-to-noise ratio, but these analog measurements will not detect pulse distortion arising from nonlinearity and dispersion.
Abstract: Summary form only given. Network management is complicated by transparency in that there is no simple way to assure that signals entering or leaving a node are valid. One can envisage monitoring optical power or signal-to-noise ratio, but these analog measurements will not detect pulse distortion arising from nonlinearity and dispersion, for example. When performance is found to be degraded at an endpoint of a connection, there is no simple way to determine in what part of the network the degradation occurred.

31 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202237
202132
202060
201998
201884