Research Areas in Theoretical Physics 2

We study dynamical instabilities arising from optical feedback, optical injection or mode coupling in lasers. The carrier dynamics in the gain material (e.g., semiconductor nanostructures) plays a central role. Another research topic concerns the extent to which these optical systems can be used for hardware-based machine learning. We use numerical methods to solve coupled differential equations as well as analytical methods of nonlinear dynamics for bifurcation analysis.

Research focus Prof. Dr. Kathy Lüdge

Reservoir computing is a machine learning method that can be easily implemented in hardware and is being intensively investigated in the research group. In the project NeurosensEar Neuromorphic Acoustic Sensor Technology for High-Performance Hearing Aids of Tomorrow, funded by the Carl Zeiss Foundation, we are investigating micro-mechanical resonators as InSensor Reservoir Computers.

Reservoir computing for in-sensor applications
Neuromorphic computing with optics
Bild1_DPG_ProjektThP2_70Prozent.pngKathy Lüdge

DFG Projekt (2020-2023) "Hybrid photonic computing in delay-coupled non-linear systems with memory"

Teilprojekt im Sonderforschungsbereich SFB910 (2019-2022) "Collective phenomena in laser networks with nonidentical units"

  • realize all optical reservoir computing schemes (evaluation via benchmark tasks: Chaotic time series prediction, Memory capacity, Channel equalization etc.)
  • develop numerical framework for simulating highly connected delay-coupled networks with memory,
  • analyze impact of network topology on computing performance.
  • explore correlations of performance and bifurcation structure
  • modeling semiconductor quantum-dot lasers with optical feedback, injection or network-coupling
  • emission stability of two-state lasing devices, optical switching applications, neuronal spiking
  • complex emission dynamics of nano- and micro-lasers
Theoretische Physik 2
Frequency combs and short pulse generation
Bild3_ML_jitter_2delayThP2.jpgTheoretische Physik 2
  • pulse shaping in passively mode-locked lasers
  • timing-jitter calculations and performance tuning via optical feedback
  • coupled mode-locked lasers