READ ME File For dataset in support of the publication "Broadband optical fibre with an attenuation lower than 0.1 decibel per kilometre" Dataset DOI: 10.5258/SOTON/D3594 Date that the file was created: July, 2025 ------------------- GENERAL INFORMATION ------------------- ReadMe Author: Francesco Poletti, University of Southampton [https://orcid.org/0000-0002-1000-3083] Date of data collection: November 2024 - July 2025 Information about geographic location of data collection: Southampton UK, Romsey UK Related projects: UKRI - EPSRC: FASTNET (EP/X025276/1) -------------------------- SHARING/ACCESS INFORMATION -------------------------- Licenses/restrictions placed on the data, or limitations of reuse: CC-BY Recommended citation for the data: This dataset supports the publication: AUTHORS: Marco Petrovich, Eric Numkam Fokoua, Yong Chen, Hesham Sakr, Abubakar Isa Adamu, Rosdi Hassan, Dong Wu, Ron Fatobene Ando, Athanasios Papadimopoulos, Seyed Reza Sandoghchi, Gregory Jasion, Francesco Poletti TITLE: Broadband optical fibre with an attenuation lower than 0.1 decibel per kilometre JOURNAL: Nature Photonics PAPER DOI IF KNOWN: Links to other publicly accessible locations of the data: Links/relationships to ancillary or related data sets: -------------------- DATA & FILE OVERVIEW -------------------- This dataset contains: Fig1_data.xlsx : column data for the line plots of loss vs wavelength in Figure 1 in the manuscript Fig2_data.xlsx : column data for the line plots of OTDR vs distance and measured cutback loss vs wavelength shown in Figure 2 in the manuscript Fig3_data.xlsx : column data for the line plots of loss vs wavelength and dispersion vs wavelength as shown in Figure 3. Fig4_data.xlsx : column data for the line plots of loss vs wavelength, minimum loss and critical bend radius vs core diameter as shown in Figure 4. Relationship between files, if important for context: NA Additional related data collected that was not included in the current data package: NA If data was derived from another source, list source: NA If there are there multiple versions of the dataset, list the file updated, when and why update was made: NA -------------------------- METHODOLOGICAL INFORMATION -------------------------- Description of methods used for collection/generation of data: Modelling data was obtained from performing finite-element simulations using COMSOL Multiphysics. OTDR and Cutback loss measurements were performed using standard procedures, see https://ieeexplore.ieee.org/document/10526513/ Methods for processing the data: Collected data was plotted using python's matplotlib libraries. Software- or Instrument-specific information needed to interpret the data, including software and hardware version numbers: None Standards and calibration information, if appropriate: None Environmental/experimental conditions: NA Describe any quality-assurance procedures performed on the data: None People involved with sample collection, processing, analysis and/or submission: Marco Petrovich, Eric Numkam Fokoua, Yong Chen, Hesham Sakr, Abubakar Isa Adamu, Rosdi Hassan, Dong Wu, Ron Fatobene Ando, Athanasios Papadimopoulos, Seyed Reza Sandoghchi, Gregory Jasion, Francesco Poletti ----------------------------------------- DATA-SPECIFIC INFORMATION Fig1_data.xlsx ----------------------------------------- Excel file with 5 separate sheets Number of variables: 2 on each sheet, wavelength and loss component Number of cases/rows: Variable list, defining any abbreviations, units of measure, codes or symbols used: Wavelength [nm], Loss [dB/km] Missing data codes: NA Specialized formats or other abbreviations used: NA ----------------------------------------- DATA-SPECIFIC INFORMATION Fig2_data.xlsx ----------------------------------------- Excel file with 7 separate sheets Sheets 1-4: Returned OTDR power vs wavelength and corresponding linear fits sheets 5-7: Loss vs wavelength Number of variables: 2 on each sheet, 1-4 OTDR power vs distance. 5-7: loss v wavelength Number of cases/rows: Variable list, defining any abbreviations, units of measure, codes or symbols used: Distance[km], Power [dB], Wavelength [nm], Loss [dB/km] Missing data codes: NA Specialized formats or other abbreviations used: NA ----------------------------------------- DATA-SPECIFIC INFORMATION Fig3_data.xlsx ----------------------------------------- Excel file with 6 separate sheets Sheet 1: SMF dispersion vs wavelength Sheet 2: HCF dispersion vs wavelength Sheets 3-6: Loss vs wavelength Number of variables: 2 on each sheet, wavelength, dispersion, loss component Number of cases/rows: Variable list, defining any abbreviations, units of measure, codes or symbols used: Wavelength [nm], Dispersion [ps/nm.km], Loss [dB/km] Missing data codes: NA Specialized formats or other abbreviations used: NA ----------------------------------------- DATA-SPECIFIC INFORMATION Fig4_data.xlsx ----------------------------------------- Excel file with11 separate sheets Sheets 1-9: Loss vs wavelength Sheet 10: minimum loss vs core diameter Sheets 11: critical bend radius vs core diameter Number of variables: 2 on each sheet, wavelength, loss, core diameter, bend radius Number of cases/rows: Variable list, defining any abbreviations, units of measure, codes or symbols used: Wavelength [nm], Loss[dB/km], Core diameter [um], bend radius [cm Missing data codes: NA Specialized formats or other abbreviations used: NA