http://dr.lib.sjp.ac.lk/handle/123456789/5497 Thu, 23 Apr 2026 10:07:22 GMT 2026-04-23T10:07:22Z http://dr.lib.sjp.ac.lk/handle/123456789/5569 Nonlinear-Impairments- and Crosstalk-Aware Resource Allocation Schemes for Multicore-Fiber-based Flexgrid Networks Dharmaweera, M.N.; Yan, L.; Zhao, J.; Wymeersch, H.; Agrell, E. Abstract: In this study, we propose a novel spectrum and core allocation scheme that incorporates both intra-core physical layer impairments and inter-core crosstalk. We demonstrate that accounting for the latter increases spectral efficiency by at least 50% when crosstalk is significant. Fri, 01 Jan 2016 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/5569 2016-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/5568 An impairment-aware resource allocation scheme for dynamic elastic optical networks Dharmaweera, M.N.; Yan, L.; Zhao, J.; Wymeersch, H.; Agrell, E. By using impairment-driven variable guardbands, our proposed dynamic resource allocation scheme accommodates 50% more traffic in comparison to existing fixed transmission-reach- and guardband-based algorithms. Sun, 01 Jan 2017 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/5568 2017-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/5567 Joint Assignment of Power, Routing, and Spectrum in Static Flexible-Grid Networks Dharmaweera, M. N.; Yen, L.; Zhao, J.; Wymeersch, H.; Agrell, E. This paper proposes a novel network planning strategy to jointly allocate physical layer resources together with the routing and spectrum assignment in transparent nonlinear flexible-grid optical networks with static traffic demands. The physical layer resources, such as power spectral density, modulation format, and carrier frequency, are optimized for each connection. By linearizing the Gaussian noise model, both an optimal formulation and a low complexity decomposition heuristic are proposed. Our methods minimize the spectrum usage of networks, while satisfying requirements on the throughput and quality of transmission. Compared with existing schemes that allocate a uniform power spectral density to all connections, our proposed methods relax this constraint and, thus, utilize network resources more efficiently. Numerical results show that by optimizing the power spectral density per connection, the spectrum usage can be reduced by around 20% over uniform power spectral density schemes. Fri, 01 Jan 2016 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/5567 2016-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/5566 Regenerator site selection in impairment-aware elastic optical networks Dharmaweera, M. N.; Yan, L.; Zhao, J.; Karlsson, M.; Agrell, E. We propose a novel regenerator site selection scheme for nonlinear impairment-aware elastic optical networks. The proposed scheme reduces bandwidth use by up to 40% in a realistic network by employing only 6 regenerator sites. Fri, 01 Jan 2016 00:00:00 GMT http://dr.lib.sjp.ac.lk/handle/123456789/5566 2016-01-01T00:00:00Z