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11-16 April 2026
Conference 13004 > Paper 13004-500
Paper 13004-500

Nonlinearities, timescales and optical cavities: a toolbox for photonic reservoir computing (Plenary Presentation)

9 April 2024 • 16:35 - 17:20 CEST | Auditorium Schweitzer, Niveau/Level 0


Optical cavities with nonlinear elements and delayed self-coupling are widely explored candidates for photonic reservoir computing (RC). For time series prediction applications that appear in many real-world problems, energy efficiency, robustness and performance are key indicators. With this contribution I want to clarify the role of internal dynamic coupling and timescales on the performance of a photonic RC system and discuss routes for optimization. By numerically comparing various delay-based RC systems e.g., quantum-dot lasers, spin-VCSEL (vertically emitting semiconductor lasers), and semiconductor amplifiers regarding their performance on different time series prediction tasks, to messages are emphasized: First, a concise understanding of the nonlinear dynamic response (bifurcation structure) of the chosen dynamical system is necessary in order to use its full potential for RC and prevent operation with unsuitable parameters. Second, the input scheme (optical injection, current modulation etc.) crucially changes the outcome as it changes the direction of the perturbation and therewith the nonlinearity. The input can be further utilized to externally add a memory timescale that is needed for the chosen task and thus offers an easy tunability of RC systems.


Kathy Lüdge
Technische Univ. Ilmenau (Germany)
Prof. Kathy Lüdge is a full professor at the Technische Universität Ilmenau since 2021, where she is leading the Theoretical Physics II/Computational Physics group at the Physics department. From 2016-2021, she was a full professor at TU Berlin & head of the Nonlinear Laser Dynamics group. She received her doctorate at TU Berlin in 2003 in experimental Surface Science, & completed her habilitation (venia legendi) on nonlinear carrier dynamics in quantum-dot lasers in 2011 at the Inst. of Theoretical Physics at TU Berlin. For her pioneering works on QD laser modelling she received the Karl Scheel Prize of the Physikalische Gesellschaft zu Berlin in 2012. She won a Humboldt Fellowship (Feodor-Lynen) to spend a year at the University of Auckland in 2016, was a DAAD supported visiting scientist at the Univ. of Minnesota in 2002, and visiting professor at FU Berlin (2015-2016). She is a well-known expert on modelling of nonlinear emission dynamics of nanostructured semiconductor devices.
Kathy Lüdge
Technische Univ. Ilmenau (Germany)