DS3 Intra-campus and Inter-campus FSO links characterization campaign for polarization-encoded QKD_ LAIQA_WP8_V1.0

The provided dataset includes power monitoring data collected over a 0.5 km free-space optical (FSO) link established to evaluate atmospheric turbulence effects on signal stability and link performance. The 0.5 km Free-Space Optical (FSO) link was deployed between the rooftops of the New and Old Buildings of the School of Electrical and Computer Engineering at the National Technical University of Athens (NTUA), ensuring a clear line-of-sight. The experimental campaign took place on July 4th, 2024, within the NTUA campus (37.97° N, 23.78° E). Data collection occurred during two distinct monitoring periods capturing a range of irradiance fluctuations, thermal gradients, and other mechanical instabilities that may influence optical signal quality.: Nighttime session: 00:06 a.m. to 00:31 a.m. Daylight session: 11:16 a.m. to 11:28 a.m. The dataset includes power level variability due to scintillation, beam wander, and potential misalignment events considering that no stabilization techniques, e.g., beam steering, were used during the operation of the link. Note: The READ_ME file includes a brief guide of the method used for the FSO power monitoring data processing along with some demonstrative results after the truncation of the provided raw data (i.e., Day_500m.rar, and Night_500m.rar) in time windows of 50 seconds as given in folders Day_500m_50sec_time_window.rar and Night_500m_50sec_time_window.rar, respectively.