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Q: Fachverband Quantenoptik und Photonik

Q 58: Photonik II

Q 58.7: Vortrag

Donnerstag, 22. März 2007, 15:30–15:45, 5J

Reduction of Guided Acoustic Wave Brillouin Scattering in Photonic Crystal Fibers — •Dominique Elser¹, Ulrik Andersen^1,2, Oliver Glöckl¹, Stefan Lorenz¹, Christoph Marquardt¹, and Gerd Leuchs¹ — ¹Institut für Optik, Information und Photonik (Max-Planck-Forschungsgruppe), Universität Erlangen-Nürnberg, Günther-Scharowsky-Str. 1, Bau 24, 91058 Erlangen — ²Department of Physics, Technical University of Denmark, Building 309, 2800 Kgs. Lyngby, Denmark

Guided Acoustic Wave Brillouin Scattering (GAWBS) leads to phase and polarization noise of light propagating in glass fibers. This excess noise is a major limitation for fiber-based squeezing sources as well as for the transmission of quantum information through fibers. In order to achieve quantum states of high quality it is therefore important to reduce the harmful effect of GAWBS.

In Photonic Crystal Fibres (PCFs), light is guided by a photonic crystal structure simultaneously acting as a phononic crystal which modifies the acoustic noise spectrum. By measurements and simulations we have demonstrated a GAWBS-noise reduction in commercially available PCFs. This gives rise to the prospect of fiber squeezers exhibiting less excess noise, resulting in higher quantum state purity. Further improvement can be achieved by tailoring the photonic microstructure such that a reduction of phonons 'by design' is achieved.