From single-band to dual-band scenarios for routing and spectrum assignment in transparent elastic optical networks
Year: 2026
Type: article
Abstract: In elastic optical networks (EONs), the frequency spectrum is divided into narrow slots, and sets of contiguous slots form channels. The NP-hard routing and spectrum assignment (RSA) problem consists of determining, for each traffic demand, a lightpath composed of a source-to-destination path and a channel, while avoiding overlapped channels for demands sharing optical fibers. Traditionally, EONs use a single optical band for transmission. However, the increase in data transmission volumes will soon demand the installation of additional capacity. One possible scenario for network operators is to exploit the use of multiple optical bands in the existing network. This introduces the multi-band RSA problem, which involves not only establishing lightpaths but also determining which band to use and where to deploy new bands. To address this, we developed two integer linear programming (ILP) models for the dual-band RSA problem, where one band is available in the entire network, and a second band can be selectively installed. We adapted two ILP models for the classical single-band RSA to incorporate real-world considerations, such as band installation costs, band opening, and band occupation policies and tested our models on realistic network topologies. We also discuss possible lines for future research, such as studying how to combine multiple optimization aspects and how to take into account quality-of-transmission requirements in the multi-band scenario.
Source: Kuwait Journal of Science
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,100
OpenAlex ID: W7213243368