READ ME File For Dataset for 'Hollow core fiber Fabry-Perot interferometers with reduced sensitivity to temperature ' submitted to Optics Letters. Dataset DOI: 10.5258/SOTON/D2170 ReadMe Author: Meng Ding, University of Southampton This dataset supports the manuscript submitted to optics letters: Meng Ding, E.R. Nemkam Fokoua, J.R. Hayes, F. Poletti, D.J. Richardson, and R. Slavik, "Hollow core fiber Fabry-Perot interferometers with reduced sensitivity to temperature," in Optics Letters. Uploaded Archive (RAR) includes 7 data files that are Excel format (.xlsx) The figures are as follows: Fig. 2: Thermal sensitivity calculated for freely coiled HCFs and Spool coiled HCFs with different coating thickness (Bare, 0 um, Line 3; Thinly-coated, 10 um, Line 4; and Standard-coated, 50 um, Line 5). Fig. 3: Thermal sensitivity of coiled HCF with respect to the fiber diameter and its comparison to free HCFs. Column A: fibre diameter; Column B: thermal sensitivity of spool coiled HCF; Column C: thermal sensitivity of freely coiled HCF. Fig. 4: Thermal sensitivity of coiled HCF (Column B) with respect to coating CTE (Column A). Fig. 5: Thermal sensitivity of coiled HCF with respect to the radius (Column A) at different spool CTE values (0 ppm/K, Column B; -0.05 ppm/K, Column C; -0.1 ppm/K, Column D). Fig. 6: Thermal sensitivity of coiled HCF (Column B) on spool with CTE of -0.05 ppm/K with respect to the central hole radius (Column A) for spool with R = 55 mm. Fig. 8: Example measument of measred reflected power of Zerodur-coiled HCF-FPI (Column B) and free-coiled HCF-FPI (Column C) when temperature (Column A) changes. Fig. 9: Measured and simulated thermal sensitivities of Zerodur-coiled and free-coiled HCF. Simulations considered Zerodur CTE of 0.07 ppm/K. Zerodur-coiled HCF, measurement (Column E & F), simulation (Column G & H); Freely-coiled HCF, measurement (Column A & B), simulation (Column C & D). Date of data collection: 1/6/2021-11/1/2021 Information about geographic location of data collection: University of Southampton, U.K. Licence: Creative Commons Attribution. Related projects: Airguide, RAEng Senior Research Fellowship, Chinese Scholarship Council Date that the file was created: 3 Apirl, 2022