READ ME File For Dataset for 'Splicing hollow core fiber with standard glass-core fiber with ultralow back-reflection and low coupling loss' Dataset DOI: 10.5258/SOTON/D3154 ReadMe Author: Bo Shi, University of Southampton This dataset supports the publication: BO SHI, CONG ZHANG*, THOMAS KELLY, XUHAO WEI, MENG DING, MENG HUANG, SONGNIAN FU, FRANCESCO POLETTI, AND RADAN SLAVÍK Splicing hollow core fiber with standard glass-core fiber with ultralow back-reflection and low coupling loss (In Press) ACS Photonics Uploaded Archive (RAR) includes 5 data files that are Excel format (.xlsx) The figures are as follows: Fig. 1: The back-reflection and coupling loss of spliced SMF-HCF connection. Fig. 4. The relationship between coupling loss and offset of light propagated through GRINs with different cleave angles to a NANF. Fig. 7. Simulated and measured back-reflection from angle-cleaved GRINs with SMF-GRIN offset. Simulations: offset (given next to the data points) optimized for minimum coupling loss. Exper-iment: offset of 4 µm (blue stars) and 5 µm (green triangles). Fig. 8. Back-reflection from zero-offset angle-cleaved SMF-GRIN: simulations (red line), data from literature (blue [22] and green [24] squares), and achieved experimentally here (red circles). Fig. 11. Measured OTDR trace showing back-reflection in the offset-spliced SMF-GRIN angle-spliced to the HCF. Date of data collection: 3/10/2022-18/9/2023 Information about geographic location of data collection: University of Southampton, U.K. Licence: Creative Commons Attribution. Date that the file was created: 12 April, 2024