Mixed line rate virtual topology design considering nonlinear interferences between amplitude and phase modulated channels

Abstract

In the last years, the migration from 10 to 40/100 Gbps networks has been proposed as a solution to increase the capacity of transparent optical networks. Initially, the replacement of 10 Gbps legacy equipment was considered. Nowadays, some works point out that the deployment of mixed line rate (MLR) networks, where 10 Gbps and higher bit rate Gbps channels share the same fiber, could be more cost effective than the total replacement of 10 Gbps systems. In this paper, we investigate the planning of 10/40 Gbps MLR networks using the ITU 50 GHz grid, considering nonlinear interferences between 10 and 40 Gbps channels, which degrade the quality of transmission. This approach is novel in the literature. In addition, we conduct a set of tests normalizing the length of fiber links, to observe the trends in MLR planning for different network sizes.

Virtual topology reconfiguration for mixed-line-rate optical WDM networks under dynamic traffic

“…To meet the explosive transmission requirement of the upper layers, based on the new transmitting technique, the rate of a wavelength can be increased from 10 Gbps to higher rates (40/100 Gbps) [4]. Mixed-line-rate (MLR) technique was investigated to increase the bandwidth provided by the WDM networks; in MLR-WDM, different rates (e.g., 10/40/100 Gbps) can be assigned to the wavelength [4][5][6][7][8]. Due to different traffic demands of node-pairs from the upper layers, some lightpaths of a backbone network may not require the highest 100 Gbps capacity.…”

“…In designing the virtual topology on MLR-WDM networks, the input ports of an optical switch and required wavelengths can be reduced by increasing the rate of transmitter and receiver, though the cost of the switches can be reduced [4]. The MLR-WDM virtual topology design (VTD) problem was proposed and studied in Aparicio-Pardo et al and Nag et al [4][5][6], and the goal of the VTD problem studied in [4] is to minimize the cost of transponders for different rates.…”

“…The MLR-WDM virtual topology design (VTD) problem was proposed and studied in Aparicio-Pardo et al and Nag et al [4][5][6], and the goal of the VTD problem studied in [4] is to minimize the cost of transponders for different rates. In MLR-WDM networks without any wavelength converter, the data signal is carried on a unique wavelength from a source node to a destination node.…”

“…That is, a lightpath can be established only if there exists a free wavelength that is not used on all fibers of the lightpath. To avoid collision, no two lightpaths using the same wavelength pass through the same fiber (named as wavelength continuity constraint) [4].…”

“…In Aparicio-Pardo et al [4], authors studied the VTD problem on MLR-WDM networks, and a variant of the VTD problems was considered for the optical connections. In Aparicio-Pardo et al [4], nonlinear impairments of the lightpaths were taken into consideration, and the studied problem was denoted as mixed-line-rates virtual topology design under nonlinear effects (MLR-VTD-uNLE).…”