On the complexity of the regenerator placement problem in optical networks
Proceedings of the twenty-first annual symposium on Parallelism in algorithms and architectures
Impairment aware based routing and wavelength assignment in transparent long haul networks
ONDM'07 Proceedings of the 11th international IFIP TC6 conference on Optical network design and modeling
Regenerator placement with guaranteed connectivity in optical networks
ONDM'07 Proceedings of the 11th international IFIP TC6 conference on Optical network design and modeling
Network design in realistic "all-optical" backbone networks
IEEE Communications Magazine
Dimensioning of survivable WDM networks
IEEE Journal on Selected Areas in Communications
An energy-aware dynamic RWA framework for next-generation wavelength-routed networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Although the problem of dimensioning an optical transport network is not new, the consideration of signal quality degradation caused by the optical medium calls for revisiting the problem in the context of dimensioning optical wavelength division multiplexing (WDM) networks. This paper addresses the issue of minimum-cost planning of long-reach WDM networks in combination with optoelectronic signal regeneration as a countermeasure for sanitizing the signal quality of lightpaths that are found to be impaired. The commonly used method of placing regenerators proportionally to the physical distance covered by a lightpath is evaluated in a realistic dimensioning scenario and for various heterogeneity degrees of optical equipment, showing that it is plagued with a serious tradeoff between efficacy and cost of regeneration. As a remedy, we propose a novel method for design/dimensioning and regeneration placement for WDM networks that employs impairment-awareness. Through experimentation with real optical network configurations and for varying heterogeneity of optical equipment, the proposed method is shown to break the aforementioned tradeoff, resulting in significant reduction in regeneration effort compared to distance-based regeneration. This is achieved without compromising the signal quality of any of the lightpaths selected by the dimensioning process and with increased cost efficiency.