Optical Networks and the Future of Broadband Services

The evolution of broadband services will depend on the widespread deployment of optical networks. The deployment of such networks will, in turn, help drive increased demand for additional capacity. In this world, service providers will have a growing need to be able to flexibly adjust capacity to accommodate uncertain and growing demand. In this article, we present a cost model that highlights the advantages of new optical networking technologies such as Dense Wavelength Division Multiplexing (DWDM) over traditional architectures for optical networks. This analysis highlights the increased flexibility and scalability of DWDM networks, which lowers the deployment costs of such networks in light of growing and uncertain demand. The DWDM architecture holds the promise of allowing the emergence of wavelength markets, where traffic could be switched between service provider networks at the optical layer (without the need for multiple costly and wasteful electronic/optical conversions). While the DWDM and Optical Cross-Connect (OxC) technologies provide a technical infrastructure for supporting wavelength markets, additional developments are also likely to be required. This paper also considers some of the impediments to the growth of wavelength markets, namely the need for secondary markets and standardized contracts

Physical layer aware open optical networking

L'abstract è presente nell'allegato / the abstract is in the attachmen

NETWORK DESIGN UNDER DEMAND UNCERTAINTY

A methodology for network design under demand uncertainty is proposed in this dissertation. The uncertainty is caused by the dynamic nature of the IP-based traffic which is expected to betransported directly over the optical layer in the future. Thus, there is a need to incorporate the uncertainty into a design modelexplicitly. We assume that each demand can be represented as a random variable, and then develop an optimization model to minimizethe cost of routing and bandwidth provisioning. The optimization problem is formulated as a nonlinear Multicommodity Flow problemusing Chance-Constrained Programming to capture both the demand variability and levels of uncertainty guarantee. Numerical work ispresented based on a heuristic solution approach using a linear approximation to transform the nonlinear problem to a simpler linearprogramming problem. In addition, the impact of the uncertainty on a two-layer network is investigated. This will determine how theChance-Constrained Programming based scheme can be practically implemented. Finally, the implementation guidelines for developingan updating process are provided

The Coalition’s plan for fast broadband and an affordable NBN: background papers

Finding a strategy to upgrade telecommunications in Australia has been a challenge for both Labor and the Coalition over the past decade. Between 2004 and 2008 governments from both sides of politics were were unable to reach a deal with Telstra for an upgrade that would fairly balance the interests of Telstra’s shareholders and those of consumers and rival carriers. After winning the 2007 election promising a $4.7 billion National Broadband Network to be built in partnership with the private sector, Labor’s talks with Telstra reached an impasse by late 2008, prompting an abrupt shift in policy. In April 2009 the Government announced it would set up a new taxpayer‐funded company, NBN Co, to build a$43 billion fibre access network. This paper presents the background detail for the Coalition\u27s National Broadband Network plan