Flexible Bandwidth Allocation in Filterless Optical Networks

Abstract

Abstract-We introduce the new concept of an elastic filterless optical network and propose an efficient heuristic algorithm for solving the static routing and spectrum assignment problem. Our simulation results obtained for different network topologies under multi-period traffic show increasing bandwidth savings with the growth of traffic load compared to a fixed-grid scenario. We also show the benefits of periodical spectrum defragmentation.

Agile filterless optical networking

“…Filterless solutions have been proposed for terrestrial and submarine network topologies. The first studies were focused on regional and core network applications [6][7][8][9][10]. Unsurprisingly, comparative cost analyses in terrestrial networks have shown significant savings are achievable in the filterless network solutions due to replacement of switching and filtering elements by simple fiber couplers.…”

“…Wavelength or spectrum consumption in filterless networks has been studied extensively [6][7][8][9][10][12][13][14]. Typical performance results are illustrated in Fig.…”

“…The results show that filterless solutions are good for networks with small numbers of nodes (£ 10-12) and size (with respect to system transmission reach), as well as good connectivity (³ 0.8) and high average nodal degree (³ 3.0). Additional 20-30% savings in spectrum consumption are possible through flex-grid operation which can be achieved at minimal upgrade cost in filterless networks [9,10]. A programmable filterless network architecture based on optical white boxes (or spatial switches) has also been proposed to reduce the spectrum consumption in filterless networks at a lower cost than ROADM-based approaches [16].…”

Programmable filterless network architecture based on optical white boxes

“…Elastic passive filterless networks were recently introduced in [13], along with a heuristic approach for survivable RSA with dedicated path protection. The RSA problem with the objective of minimizing spectrum usage in passive filterless networks (unprotected design) was further studied in [14].…”

Filterless architecture for coherent undersea networks

“…Furthermore, the filterless architecture of both the edge terminals and line systems allows for more flexible bandwidth allocation through elastic or flexible networking, which can potentially improve the spectrum utilization in high-capacity submarine networks [19].…”