Bernhard Schrenk

We deploy shortwave-QKD over short-reach in-house/datacom architectures and show that few-mode propagation and speckle-selective loss severely impact the QKD performance. We accomplish 12 kb/s secure-key generation in the presence of 50 co-existing data channels. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved. Full Article  | PDF Article More Like This

This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Thomas Lorünser 1,*, Stephan Krenn 1, Christoph Pacher 1,2 and Bernhard Schrenk 1 1 AIT Austrian Institute of Technology, Giefinggasse 4, 1210 Vienna, Austria 2 fragmentiX Storage Solutions GmbH, Plöcking 1, 3400 Klosterneuburg, Austria * Author to whom correspondence should be addressed.

Abstract Coherent homodyne detection requires precise matching of emission wavelengths between transmitter and local oscillator at the receiver. Injection locking can provide all-optical synchronization of the emission frequencies, even under wavelength-swept emission. By adapting the sweep parameters to the conditions in the optical fiber plant, transmission impairments can be mitigated.