READ ME File For Dataset for 'Connecting hollow-core and standard single-mode fibers with perfect mode-field size adaptation' Dataset DOI: https://doi.org/10.5258/SOTON/D2836 ReadMe Author: Radan Slavík, University of Southampton This dataset supports the publication: Ailing Zhong, Eric Numkam Fokoua, Meng Ding, Daniel Dousek, Dmytro Suslov, Stanislav Zvánovec, Francesco Poletti, Radan Slavík and Matěj Komanec Connecting hollow-core and standard single-mode fibers with perfect mode-field size adaptation, Journal of Lightwave Technology, 2023 Uploaded Archive (ZIP) includes 9 data files that are purely numerical (.xlsx) The figures are as follows: Fig. 2: Fig2_simulated_focal_MFD.xlsx Simulated dependence of focal MFD (in um) over pitch of the GRIN fibre for OM2 fibre (Columns 1 and 2), GRIN100 (Columns 3 and 4) and GRIN 200 (Columns 5 and 6). Fig. 4: Fig4_measured_and_simulated_IL.xlsx Sheet 1 (simulated IL): Simulated IL over beam_width/core_diameter ratio for: 1st window NANF (Columns 1 and 2), 2nd window NANF (Columns 3 and 4), and 1st window DNANF (Columns 5 and 6) Sheet 2 (measured IL): Measured IL over beam_width/core_diameter ratio for: 1st window NANF (Columns 1 and 2), 2nd window NANF (Columns 3 and 4), and 1st window DNANF (Columns 5 and 6) Fig.5: Fig5_Fourier_transform_of_the_transmission_spectra.xlsx Fourier transform-calculated transmission (in dB) over wavelength (in nm) for 2nd window NANF. Sheet 1 (GRIN100_based MFA): for Grin100; Sheet 2 (OM-based-MFA): for OM2. Fig.6: Broadband_sweeping_1st_window_NANF.xlsx Transmission spectra (in dB) over wavelength (in nm) for 1st window NANF, 2nd window NANF and 1st window DNANF. Reference spectra and spectra measured when SSMF-MFA-HCF-MFA-SSMF was inserted are shown as separate files. Reference_1st_window_NANF.xlsx Broadband_sweeping_2nd_window_NANF.xlsx Reference_2nd_window_NANF.xlsx Broadband_sweeping_DNANF.xlsx Reference_DNANF.xlsx Date of data collection: 30/05/2022-11/03/2023 Information about geographic location of data collection: Optoelectronics Research Center, UK. Czech Technical University in Prague, Czech Republic Licence: Open Access Publishing Agreement. Related projects: Czech Science Foundation (GACR) grant GA22-32180S, EPSRC projects EP/P030181/1 and EP/W037440/1. Date that the file was created: 24 October, 2023.