Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster VIII

Q 57.11: Poster

Thursday, March 14, 2024, 17:00–19:00, Aula Foyer

Machine-aided Autonomous Dispersion Compensation of Femtosecond Pulses in a Fiber-Integrated System — •Mehmet Müftüoglu, Bennet Fischer, and Mario Chemnitz — Leibniz-Institute of Photonic Technologies, Albert-Einstein-Str. 9, 07745 Jena, Germany.

Dispersion compensation is crucial for optical communication and nonlinear optics. Typical compensation methods rely on bulky dispersive elements such as prisms and gratings or dispersive compensating fibers(DCFs). In this work, we compensated 6-meter fiber system dispersion to achieve transform-limited femtosecond pulses at the lead fiber’s distal end. Wave shaping manipulates individual frequencies in the frequency domain, enhancing control over the phase profile. Our setup consists of a laser, an amplifier(EDFA), a waveshaper, an auto-correlator, and a computer. Our methodology incorporates a feedback loop between the autocorrelator and the waveshaper to optimize the phase of an ultrashort pulse autonomously. For unsupervised system control, we implement the Particle Swarm Optimization algorithm to compensate for target system configuration (e.g. fiber lengths or pump power). The swarm algorithm optimizes the seven free parameters of a polynomial Taylor expansion in 6th order. In our experiments, we consistently approached transform-limited pulses in various scenarios, achieving durations of 120 fs at lower power and 72 fs at higher power. Our machine-assisted compression method is applicable to supercontinuum spectra excitation in highly nonlinear fibers.

Keywords: Pulse Compression; Autonomous systems; Optical Fiber Communication; Ultrashort Pulse Generation; Meta-Heuristic Optimization Application