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Q: Fachverband Quantenoptik und Photonik

Q 27: Precision Measurements and Metrology IV (joint session Q/A)

Q 27.6: Talk

Wednesday, March 16, 2022, 12:00–12:15, Q-H11

Influence of Spontaneous Brillouin Scattering in Cascaded Fiber Brillouin Amplification for Fiber-Based Optical Frequency Dissemination — •Jaffar Kadum and Sebastian Koke — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

The roadmap towards the redefinition of the SI Second in terms of an optical atomic clock transition demands a comparison between remote optical clocks. Ultra-stable coherent frequency dissemination via interferometric fiber links (IFLs) is currently the only available method to compare the best optical clocks at the level of their uncertainty over continental scales. Fiber Brillouin amplifiers (FBAs) are an attractive alternative to conventional Erbium-doped fiber amplifiers due to high gain and greatly reduced back-reflection sensitivity [1]. FBA exploits the stimulated Brillouin scattering (SBS) effect initiated by the nonlinear interactions of signal and counterpropagating pump wave. However, the spontaneous Brillouin scattering (SpBS) resulting from thermally excited acoustic waves [2] degrades the signal-to-noise ratio, which may become limiting for IFLs longer than currently demonstrated. To gain deeper insight into the properties of amplified SpBS in cascaded FBA and to optimize future longer FBA-based IFLs, we developed a simulation model, which will be introduced and discussed in this contribution. 1.O. Terra et al. , *Brillouin amplification in phase coherent transfer of optical frequencies over 480 km fiber,* Opt. Express 18, (2010). 2.R.W. Boyd et al., *Noise initiation of stimulated Brillouin scattering,* Phys. Rev. A, 42, (1990).