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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TL;DR: This article presents ACCORDANCE, a novel optical access network architecture based on OFDMA technology and applied on a PON topology that aims to outperform existing PON solutions in terms of total capacity, bandwidth allocation flexibility, number of users, and network reach.
Abstract: This article presents ACCORDANCE, a novel optical access network architecture based on OFDMA technology and applied on a PON topology. In compliance with next generation optical access requirements, this architecture aims to outperform existing PON solutions in terms of total capacity, bandwidth allocation flexibility, number of users, and network reach. Moreover, it provides the opportunity for convergence with wireless technologies and a smooth migration path from legacy access solutions like TDMA-PONs and DSL.
56 citations
Patent•
AT&T1
TL;DR: In this article, a method and system for capacity-efficient restoration within an optical fiber communication system is proposed, where each optical fiber connection between nodes includes at least three channel groups with different priority levels for restoration switching in response to a connection failure.
Abstract: A method and system provide capacity-efficient restoration within an optical fiber communication system. The system includes a plurality of nodes each interconnected by optical fibers. Each optical fiber connection between nodes includes at least three channel groups with different priority levels for restoration switching in response to a connection failure. The system maintains and restores full-capacity communication services by switching at least a portion of the channel groups from a first optical fiber connection to a second optical fiber connection system based on the priority levels assigned to the channel groups. Service reliability is effectively maintained without incurring additional costs for dedicated spare optical fiber equipment by improving idle capacity utilization.
55 citations
22 Feb 1998
TL;DR: This talk attempts to check whether such optical protection and restoration (optical recovery henceforth) makes practical sense, given similar mechanisms that are already available at the higher layers (e.g., SONET/SDH or ATM).
Abstract: Summary form only given. Experimentation with optical switching technology by various telecom companies for healing an optical network in the face of equipment and fiber failures has made headlines recently. This talk attempts to check whether such optical protection and restoration (optical recovery henceforth) makes practical sense, given similar mechanisms that are already available at the higher layers (e.g., SONET/SDH or ATM). We then discuss the implications of various network parameters on the implementation of optical recovery.
55 citations
TL;DR: This paper considers the application in a flexi-grid network of a FMT system employing hybrid optical/digital mode demultiplexer and low-complexity MIMO-based digital signal processing (DSP), and formulate using linear programming the routing, modulation format, baud rate, and mode assignment problem, for two different switching policies.
Abstract: Application of few-mode transmission (FMT) in transport optical network is currently under scrutiny, especially for metro networks, where shorter distances and pressing traffic increase (e.g., due to a growing need for metro datacenter interconnection) represent promising conditions for FMT deployment. In this paper, we analyze, from a network-level perspective, the benefits introduced by FMT in metro networks. We consider the application in a flexi-grid network of a FMT system employing hybrid optical/digital mode demultiplexer and low-complexity MIMO-based digital signal processing (DSP). Under this system model, we derive the reach values associated to different modulation formats, baud rates, and number of modes. For the first time to the best of our knowledge, we formulate using linear programming the routing, modulation format, baud rate, and mode assignment problem, for two different switching policies (spatially flexible and spatially and spectrally flexible switching). Using our proposed modes, we identify the configurations that ensure minimum spectrum occupation or minimum cost of installed transceivers, and contrast them to the benchmark case of single-mode transmission.
55 citations
TL;DR: In principle, an optical network employing wavelength routing, wavelength reuse, and multihop packet switching is modularly scalable to very large configurations in both the hardware and software sense and is a viable architecture for a new ATM-based telecommunications infrastructure.
Abstract: In principle, an optical network employing wavelength routing, wavelength reuse, and multihop packet switching is modularly scalable to very large configurations in both the hardware and software sense. As such, it is a viable architecture for a new ATM-based telecommunications infrastructure The network architecture considered for a new, scalable, broadband telecommunications infrastructure is based on (1) the use of wavelength division multiplexing (WDM) and wavelength routing; (2) the translation of signals from one wavelength to another at the access stations; and (3) the use of multihop ATM packet switching. These principles permit networks to be built whose size is essentially unlimited. >
55 citations