2025/06/03 by Z Haider, Haider, Zeshan
Engineering · #FOS: Physical sciences #Optical Network Technologies #Optical Wireless Communication Technologies #Quantum Physics (quant-ph) #Semiconductor Lasers and Optical Devices
paper · pdf · doi:10.48550/arxiv.2506.02656
openalex publication_date 2025/06/03 · openalex created_date 2025/10/14 · openalex updated_date 2026/07/28
The experimental implementation of the polarization encoding system is presented using weak coherent pulses at a low enough frequency. The optical pulses are generated through intensity modulation at the repetition rate of 10 pulses/sec with the intensity of 7μW, whose polarization is modulated by the Pockel cell. For a 5 km long fiber link, the key rate is thus limited to 10 bits/sec accompanied by temporal synchronization among the Intensity Modulator (IM), Pockel cell, and the gate of the detector. The system was continuously operated for 5 minutes, and 3000 binary bits were distributed between two nodes with an error rate less than unity. We have used only a single polarization basis, i.e., horizontal and vertical polarizations, as the objective of this experiment is to validate the feasibility of the setup under simplified conditions, intended primarily for the laboratory-scale demonstrations.