This data provides the data points of Figures 1, 2 and 3 from the the paper "Challenges in Extending Optical Fibre Transmission Bandwidth Beyond C+L Band and How to Get There", submitted in the 25th International Conference on Optical Network Design and Modelling 2021 (ONDM2021).Figure1.txt have 2 columns. The first column have the throughput data achieved by some works in the reference. The second column have the distance data, corresponding to the corresponding throughput achieved.Figure2.txt have 4 columns. The first 3 have the launch power data for the cases considered in the paper. The last column has the corresponding wavelength. The file has 660 lines representing 660 WDM channels.Figure3.txt have 8 columns. The first 7 have the SNR data for the cases considered in the paper. The last column has the corresponding wavelength. The file has 660 lines representing 660 WDM channels.