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Publications
- D. Prousalis and L. Wetzel, “Time References and Clock Signal Synchronization: Entrainment of Mutually Synchronized Networks”, (in preparation)
- D. Prousalis, L. Wetzel, C. Duclut, F. Jülicher, “Synchronization dynamics
in the presence of time delay, inertia and dynamical noise”, (in preparation)
- J. Asmus, D. Platz, B. Friedrich, I. F. Sbalzarini, L. Wetzel, “Basin stability
of phase-locked solutions in networks of delay-coupled phase oscillators”,
(in preparation)
- C. Hoyer, L. Wetzel, D. Prousalis, J. Wagner, F. Jülicher, F. Ellinger, “Mutual Synchronization of Spatially Distributed 24 GHz Oscillators up to Distances of 500 m”, (submitted to TCAS2)
- L. Wetzel, D. Prousalis, R. Riaz, C. Hoyer, N. Joram, J. Fritzsche, F.
Ellinger, and F. Jülicher, “Network Synchronization Revisited: Time Delays in Mutually Coupled Oscillators”, 2022 (Submitted to IEEE Access)
- C. Hoyer, L. Wetzel, D. Prousalis, J. Wagner, F. Jülicher, F. Ellinger, “Stability Analysis of Mutually Synchronized Spatially Distributed 24 GHz Oscillators”, (accepted to I2MTC 2022: IEEE International Instrumentation and Measurement Technology Conference)
- D. Prousalis and L. Wetzel, “Synchronization in the presence of time delays
and inertia: Stability criteria”, (Phys. Rev. E 105, 014210, 2022)
- C. Hoyer, D. Prousalis, L. Wetzel, R.F. Riaz, J. Wagner, F. Jülicher, F. Ellinger, “Mutual Synchronization with 24 GHz Oscillators”, 2021 IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea, 22-28 May 2021, pp. 1-5.
- R.F. Riaz, D. Prousalis, C. Hoyer, J. Wagner, F. Ellinger, F. Jülicher, L. Wetzel, “Stability and Transient Dynamics of PLLs in Theory and Experiments”, 2020 European Conference on Circuit Theory and Design (ECCTD), Sofia, Bulgaria, pp. 1-4
- N. Punetha, L. Wetzel, “How clock heterogeneity affects synchronization
and can enhance stability” (arXiv:1908.11085, accepted to PRE, 2019)
- D. Métivier, L. Wetzel, S. Gupta, “Onset of synchronization in networks of
second-order Kuramoto oscillators with delayed coupling: Exact results and application to phase-locked loops” (Physical Review Research, 2019)
- L. Wetzel, David Jörg, A. Pollakis, Wolfgang Rave, Gerhard Fettweis, Frank Jülicher, “Self-organized synchronization of digital phase-locked loops with delayed coupling in theory & experiment”, (PLoS ONE 12(2):e0171590, February 2017)
- L. Wetzel, A. Pollakis, David Jörg, Wolfgang Rave, Gerhard Fettweis, Frank Jülicher, “Self-organized synchronisation in massive MIMO inspired by biological systems”, (IEEE Workshop 2015 – Molecular, Biological, and Multi-Scale Communications) [researchgate]
- David Jörg, A. Pollakis, L. Wetzel, Wolfgang Rave, Gerhard Fettweis, Frank Jülicher, “Synchronization of Mutually Coupled Digital PLLs to enable Massive MIMO Systems”, (IEEE ICC 2015 – Wireless Communications Symposium) [researchgate]
- A. Pollakis, L. Wetzel, David Jörg, Wolfgang Rave, Gerhard Fettweis, Frank Jülicher, “Synchronization in Networks of Mutually Delay-Coupled Phase-Locked Loops”, (New Journal of Physics, October 2014)
- L. Wetzel, “Effect of distributed delays in systems of coupled phase oscillators”, PhD-thesis, TU-Dresden, Max-Planck-Institute for the Physics of Complex Systems (2012) [qucosa]
- L. Wetzel, L. G. Morelli, A. C. Oates, F. Jülicher and S. Ares, “Synchronization of phase oscillators in the presence of distributed delays”, arXiv:1206.2288v1 (2012)
- L. Wetzel, “Stability and statistical properties of stochastic delay differential equations”, diploma thesis (2008)
Patents
Talks & Poster
- Workshop: Intelligent Machines? Self-Organized Nonlinear Dynamics of Machines across Scales 06/2022 in Dresden, “Ising Machines — Analog Computing Using Coupled Oscillators”
- 2022 Joint conference of the European Frequency and Time Forum & the IEEE International Frequency Control Symposium 04/2022 in Paris, “Mutual Network Synchronization: How Precise Phase Relations Can be Achieved in the Presence of Large Cross-Coupling Time Delays”
- Presentation at Naventik GmbH 04/2021 in Chemnitz, “Entrainment and self-organized synchronization — Spatially distributed clocks and their applications”
- 2021 IQ Preis Mitteldeutschland 05/2021, virtual pitch, “Navigation mit geschlossenen Augen — Richtungshören innerhalb existierender Mobilfunkarchitektur”
- Colloquium: Center for Advancing Electronics Dresden (cfaed) 09/2019 in Dresden “Self-organized synchronization — From localized time references to spatially extended clocking”
- Dynamic Days Conference 06/2016 in Corfu Town (Corfu, Greece), “Phase dynamics of delay-coupled electronic clocks with filter induced memory effects”
- Graduate Lectures Mathematical Department at the TU-Dresden 01/2015, “Synchronization — Embryonic Development to Electronic Networks”
- PhD Circle Meeting 04/2010 in Amsterdam
“Distributed vs Fixed Delay in a System of Coupled Phase Oscillators”
- Meeting of the German Physical Society in Regensburg (DPG 03/2010)
“Distributed vs Fixed Delay in a System of Coupled Phase Oscillators”
- Meeting of the German Physical Society in Dresden (DPG 03/2011)
“Effect of distributed delays on synchronization dynamics”
- Graduate Lecture at Faculty of Science Department of Mathematics 01/2015
“Synchronization: Embryonic Development to Electronic Networks”
- 675. WE-Heraeus Seminar: Delayed Complex Systems 2018, (link)
“Design centering quantifies basin stability of synchronized states in mutually delay-coupled electronic clocks”
- Workshop on Dynamics of Coupled Oscillators: 40 Years of the Kuramoto Model (MPI-PKS 07/2015)
“Robust Synchronization in Electronic Networks with Delay Coupled Distributed Clocks”
- Meeting of the German Physical Society 2009 in Dresden (DPG 03/2009)
“Distributed time delay in the Kuramoto model of coupled oscillators”
- Annual Zebrafish Meeting 07/2009 in Rome, Italy
“The effects of intercellular communication in biological clocks”
- Delayed Complex Systems workshop 2009 in Dresden at (MPI-PKS 10/2009)
“Coupled Phase Oscillators with Distributed Delay”
- Dynamic Days 01/2012 in Baltimore, USA
“Effect of Distributed Delays on Synchronization Dynamics”
- Meeting of the German Physical Society 2012 in Berlin (DPG 03/2012)
“Effects of Distributed Delay in the Coupling of Phase Oscillators for m-twist Solutions”
- Physics of Living Matter 09/2012 in London, UK
“Reconstructing the segmentation clock oscillator” (3rd author)
Scientific Motivation
- In complex systems the synchronization and coordination of many individual parts plays a crucial role. Examples range from multi-core computer architectures, power grid networks, coupled laser arrays, and wireless communication all the way to large groups of interacting cells during embryogenesis or in the brain. Information transmission necessary for the coordination of such large groups of interacting parts is often not instantaneous. This can introduce communication delays within the system which cannot be neglected. In associated mathematical models such delays in the interaction terms lead to qualitatively new behavior. Phenomena like coexisting stable solutions and dynamic behavior that depends nonlinearly on different system parameters can be observed.Detailed analysis of such systems is required to built efficiently designed industrial parts such as power saving micro-electronics or precisely synchronized clocks, as well as to understand the evolution and function of biological systems. Interdisciplinary teamwork, enthusiasm and strong communication skills to bridge different approaches and fields are important to successfully tackle these complex problems.
Education & Work
- 11/2019 – todayPROJECT LEADER of VIP+ validation project “PLL Synchronization”.
Coordination of collaboration with Fraunhofer IZM Assid and the TU-Dresden. Model analysis to inform architecture design of mutual synchronization at 60 GHz. Test and validation of precise phase synchronization over large distances at 24 GHz. Software development of phase-locked loop simulation libraries in Python. Market analysis, unique selling point identification, communication with industry.
- 11/2017 – todayPROJECT LEADER at Max-Planck Institute for the Physics of Complex Systems
Coordination of research in collaboration with international team of 12 scientists. Published research articles, presented our work at international conferences. Received external funding of 1.5 million Euro for a technology validation program to transfer results from basic research to industrial application. Supervising PhD student, guest scientist and internships in distinct research projects.
- 03/2017 – 11/2017Paternity leave and part time patent and project management at MPI-PKS.
- 04/2015 – 03/2017PROJECT LEADER at Max-Planck Institute for the Physics of Complex Systems
Coordinated research in collaboration with international team of 10 scientists. Initiated outreach and communication with industry and Fraunhofer institutes. Organized biweekly Nuclear Lounge after science event with up to 30 participants.
- 02/2015 – 04/2015Parental leave, traveled New Zealand in a camper-van.
- 11/2012 – 02/2015POSTDOC POSITION at Max-Planck Institute for Physics of Complex Systems
Patented novel synchronization concept for modern electronic systems. Established research collaborations on “Self-organized synchronization in networks of delay coupled electronic clocks in theory and experiment”
- 07/2008 – 10/2012PhD at Max-Planck-Institute for the Physics of Complex Systems, Biological Physics, “Effect of Distributed Delays in Systems of Coupled Phase Oscillators”
- 10/2006 – 03/2008Diploma in Physics at University of Leipzig
Diploma thesis: “Stability and Statistical Properties of Stochastic Delay Differential Equations”
Diploma examination in
“Experimental physics” (Grade: 1.0)
“Theoretical physics” (Grade: 1.3)
“Stochastic processes & nonlinear dynamics” (Grade: 1.3)
- 10/2005 – 09/2006Studies of Physics at ETH Zürich, Switzerland
Diploma examination in
“Micro- & Nanosystems” (Grade: 1.3)
“Management & Organization” (Grade: 2.0)
- 10/2002 – 09/2005Studies of Physics at University of Leipzig
09/2004 Intermediate Diploma (GPA: 1.7)
- 08/1999 – 07/2001A-levels at “Sophiengymnasium Colditz” (GPA: 1.6)
- 08/1998 – 06/1999Stay abroad, High School year in the USA (GPA: 1.0)
Skills
- Languages
- English: Full professional proficiency, Cert. “UNIcert III”
- French & Spanish: Elementary proficiency
- German: Mother Tongue
- IT (*) Basic, (**) Advanced, (***) Excellent
- C++ (***)
- MATLAB/Simulink (***)
- Qt (*)
- Linux (***)
- Mathematica (**)
- Gimp & Inkscape (**)
- Adobe Photoshop (*)
- LATEX (**)
- Gnuplot (**)
- HTML (*)
- openGL (*)
- AutoCAD (**)
- Windows (**)
- Microsoft/Open Office (***)
- ImageJ & FIJI (*)
Activities & Outreach
- 01/2015 – 05/2015Art&Science, Flock of Happenings (Florian Dombois), Dresden
- 06/2013 – 04/2015Organizer, Nuclear Lounge After Science Event, MPI-PKS
- 12/2010 – 12/2014Reader, Christmas Stories, Barockviertel Dresden
- 05/2011 – 04/2012Mentoring of high school students, project “Die Komplizen”
- 10/2010 – 03/2011Teaching assistant for practical training in experimental physics at the TU Dresden
- 09/2009 – 10/2009Assistant trainer American Football, Team Saxony
- 10/2008 – 03/2009Teaching assistant for mathematical methods in physics at the TUD
- 09/2007 – 10/2007Student assistant for an introductory course on physics & mathematics at the University of Leipzig
- 12/2004 – 03/2007Private tutoring of students in physics
- 06/2003 – 07/2003Practical training at the Leibniz Institute of Surface Modification, Epitaxial growth of GaAs semiconductors
- 09/2001 – 06/2002Community Service, University Hospital Leipzig, Oncology
- 08/2001 – 09/2001Practical training at Sächsische Bau- & Restaurierungswerkstätten, Management
Interests
- Machine Learning, Artificial Intelligence, Electronic Prototyping, Reading, Politics, Piano, Skiing & Snowboarding, Hiking, Aikido
- First Division American Football (Dresden Monarchs e.V.), Vice-Champion 2013
