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.

Flexible open ring optical network and method

Abstract: A flexible open ring optical network includes a plurality of nodes connected by twin or other suitable optical rings Each node is operable to passively add and passively drop traffic from the rings The nodes may include a transport element for each ring The transport elements include an optical splitter element and an optical combiner element The optical splitter element is operable to passively combine an add signal including local add traffic and a first transport signal including ingress traffic from a coupled optical ring to generate a second transport signal including egress traffic for transmission on the coupled optical ring The optical combiner element is coupled to the optical splitter element and is operable to passively split a third transport signal including the ingress traffic to generate a drop signal including local drop traffic and a fourth transport signal including the ingress traffic Protection switching may be provided by selectively openable switches disposed in and distributed around the rings

Performance Optimization and Evaluation for Torus-Based Optical Networks-on-Chip

Abstract: As a new trend, torus-based optical networks-on-chip (ONoCs), which can be considered as an extension of a 2-D network topology based on a mesh topology, can overcome the bandwidth limitation of a conventional electrical networks-on-chip. Although ONoCs have many advantages, crosstalk and insertion loss are the two main causes of the performance degradation and network scalability constraints. When traditional crossing and optical routers are used in the original torus structure, a bit error rate of 10 -9 is needed for reliable transmission for a network scale of no more than 5 × 5. To improve the performance of torus-based ONoCs and expand network scalability, an optimum crossing of 60° or 120° is applied in an optical router and network for the first time, instead of the conventional crossing fixed at 90°. Furthermore, a mathematical noise analysis model is presented, and then, used in designing an optical communication systems based on a torus-based optical interconnection network. According to the simulation results, optimized torus-based ONoCs have a better signal-to-noise ratio (SNR) for the path-setup link at a certain network scale compared to a traditional network with fixed crossing angle. For example, when the network scale of a torus-based ONoC is 6 × 6 and the input power is 0 dBm, the SNR of a torus-based ONoC using the optimized structure can reach 23.87 dB, which is 2.21 and 9.27 dB higher than those using crux and optimized crossbar routers, respectively.

Hybrid Link/Path-Based Design for Translucent Photonic Network Dimensioning

Abstract: The advancement of ultralong-haul transmission technology has dramatically enhanced the all-optical reaches. However, the actual situations of installed fiber and sites for terrestrial network often prevent implementing a purely transparent network, and thus, opaque reshaping retiming regenerating (3R) regeneration is required to guarantee optical signal reachability. Since 3R regenerators based on optical/electrical/optical conversion tend to dominate the total network costs, an efficient network design method that allocates a minimum number of 3R regenerators to optimum locations is essential to build a cost-effective photonic network. In this paper, we propose such a network-dimensioning method by combining the advantages of link-based and path-based design approaches. It first guarantees optical signal reachability for any possible traffic demand in each segmented linear link. After combining all the links, excessive regenerators are eliminated based on the optical signal quality check with -factor calculation for each wavelength path. A trial design of a large-scale mesh network demonstrated a significant cost savings of more than 30% in comparison with a conventional link-based design. In the trial, the impact of fiber loss coefficient over the total network cost was investigated quantitatively, addressing the importance of such quantitative modeling and analysis.

Next generation optical nodes: The vision of the European research project IDEALIST

Abstract: As traffic demands become more uncertain and newer services continuously arise, novel network elements are needed to provide more flexibility, scalability, resilience and adaptability to today's optical networks. Considering these requirements, within the European project IDEALIST the investigation of elastic optical networks is undertaken with special focus on next generation optical node architectures. As an evolution of existent ROADMs and OXCs, these optical nodes will establish a new paradigm in which the network requirements will be efficiently addressed considering various emerging dimensions. In this article, we describe the drivers, architectures, and technologies that will enable these novel optical nodes. In addition, multivendor traffic interoperability, optical defragmentation, and node cascadability are also described as considerations in the node design.

Evolution of packet-optical integration in backbone and metropolitan high-speed networks: a standards perspective

Abstract: Network operators are currently in the midst of a situation in which there is doubling of bandwidth requirement every two years, although the growth in revenue is nearly flat. In this situation providers must plan their networks to optimize for future growth and take into consideration flat-to-declining operating margins. The OPEX benefits of keeping the data in the lower layers of the network stack can be leveraged to plan future networks. We focus on the impact of evolving standards in the lower layers of the telecommunications stack through the contributions of the IEEE, ITU, and IETF. Specifically, we focus on the WDM, carrier Ethernet, OTN, MPLS, and MPLS-TP set of transport standards. These standards have evolved and are being adapted to meet the requirements of next generation networks and currently being considered in the standard bodies. We show through a simulation study that by adopting the packet-optical integrated standard families, providers would benefit because of CAPEX reduction and thereby enhance margins - benefiting the e-community through better services.