ACOP-MB: Amplifiers operating point optimization to increase QoT in multiband scenarios

The growing demand for data, driven by the increase in internet users and the need for higher bandwidth services, puts significant pressure on network infrastructures. In this context, maximizing the efficiency of optical networks has been a common effort among companies and academic groups. One promising approach to tackling this challenge is the use of multi-band optical transmissions, which make it possible to increase the data transmission capacity of an optical link. Rather than simply expanding the physical infrastructure, this solution seeks to maximize the use of existing resources. Due to the SRS (Stimulated Raman Scattering) effect, which is significantly present in multiband scenarios, as well as the wavelength-dependent parameters such as attenuation and effective area that increase complexity in these scenarios, a combined and simultaneous optimization process is required for the launch power and amplifiers for each band present on the link. Therefore, in this work, we present a new approach to optimizing QoT (Quality of Transmission) in a multiband scenario, called ACOP-MB (Adaptive Control of Operating Point - Multiband), which uses a genetic algorithm for optimization. We considered optical links with 360 and 440 km, 386 transmission channels in the S, C and L bands simultaneously, and EDFAs (Erbium Doped Fiber Amplifiers) and TDFA (Thulium Doped Fiber Amplifier). The proposed approach achieved a GSNR (Generalized Signal-to-Noise Ratio) of 14.34 dB over a distance of 360 km, representing a gain of approximately 7 dB over traditional loss compensation approach. In addition, ACOP-MB presented a transmission rate around 32 Tb/s higher when compared to the loss compensation approach, in the studied scenario, demonstrating its potential for optimizing the performance of multiband systems in advanced optical networks.