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We present a continuous-variable QKD system using heterodyne detection. We experimentally determine channel characteristics and compare them to bounds of our entanglement criterion. For the first time, the local oscillator is considered in this verification.
We report on the generation of high-energy femtosecond pulses from an ytterbium-doped photonic crystal fiber oscillator. Sub-150 fs pulses are obtained at low-cavity dispersion. By increasing the normal cavity dispersion, pulse energy exceeds 100 nJ.
We demonstrate amplification of femtosecond pulses in large mode area singlemode Yb-doped photonic bandgap Bragg fibers. 260 fs 5 µJ pulses are obtained at 100 kHz repetition rate (1 W of average power).
A narrow linewidth thulium fiber laser is tuned from 1945 – 2090 nm to investigate atmospheric transmission at 1 km. Results confirm simulations with high transmission >2025 nm and strong atmospheric absorption <1960 nm.
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