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Q: Fachverband Quantenoptik und Photonik
Q 59: Poster IV
Q 59.73: Poster
Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof
Characterization of laser noise with an optical fiber interferometer composed of a 3x3 fiber coupler — •Robin Klöpfer1,2, Francesca Celine Catalan1, Ralf Albrecht1, Annika Belz2, Harald Kübler2, Robert Löw2, Gareth Lees1, and Tilman Pfau2 — 1AP Sensing GmbH, Herrenberger Straße 130, 71034 Böblingen, Germany — 25. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
Over the past few decades, fiber-based sensors have been widely deployed in different areas. Distributed acoustic sensing (DAS) in particular has been an important tool for infrastructure monitoring and seismic activity detection. A DAS device sends coherent light into an optical fiber and evaluates the Rayleigh backscattering to monitor strain and acoustic signals over long distances in real time. Because of the high sensitivity of DAS, it is important to ensure a stable optical architecture, starting with a low-noise light source.
Here we characterize the phase and frequency noise of narrow-linewidth lasers using a 120° phase difference unbalanced Michelson interferometer composed of a 3x3 optical fiber coupler. This Michelson interferometer is capable of direct as well as wavelength- and polarization-independent extraction of the differential phase of the incoming laser light, without the need for noise models.
In addition, laser noise measurements are complemented by DAS performance evaluation to identify the most suitable laser for future sensor performance improvements.