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Photon-number dependent afterpulsing in superconducting nanostrip single-photon detectors
Sebastian M. F. Raupach, Mariia Sidorova, Alexej D. Semenov
Superconducting nanostrip single-photon detectors (SNSPD) are wide-spread tools in photonic quantum technologies. Here, we study afterpulsing in commercial SNSPD made of amorphous…
Brillouin amplification supports accuracy in optical frequency transfer over 1400~km of underground fibre
Sebastian M. F. Raupach, Andreas Koczwara, Gesine Grosche
We investigate optical frequency transfer over a 1400~km loop of underground fibre connecting Braunschweig and Strasbourg. Largely autonomous fibre Brillouin amplifiers (FBA) are t…
Optical frequency transfer via a 660 km underground fiber link using a remote Brillouin amplifier
S. M. F. Raupach, A. Koczwara, G. Grosche
In long-haul optical continuous-wave frequency transfer via fiber, remote bidirectional Er-doped fiber amplifiers are commonly used to mitigate signal attenuation. We demonstra…
Chirped Frequency Transfer with an accuracy of and its Application to the Remote Synchronisation of Timescales
S. M. F. Raupach, G. Grosche
We demonstrate combined high-fidelity long-haul transfer of a linearly chirped, optical frequency and time transfer. In a proof-of-principle experiment we transfer an optical frequ…