Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: HL Poster II
HL 35.64: Poster
Mittwoch, 3. April 2019, 17:30–20:00, Poster E
Optical frequency comb quantum dash semiconductor lasers subject to optical self feedback — •Patrick Fiala1, Dominik Auth1, Christoph Weber1, Quentin Gaimard2, Abderrahim Ramdane2, and Stefan Breuer1 — 1Institute of Applied Physics, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany — 2Centre de Nanosciences et Nanotechnologies (C2N), CNRS, Marcoussis 91460, France
Self mode-locked quantum dash lasers emitting at 1535 nm are compact photonic sources for broadband optical frequency comb generation. They find application as super-channel sources in datacom. Their mode comb spacing can be dynamically controlled by optical self feedback [Fiala et al, DPG Spring Meeting Berlin (2018), DY 69.18]. In this work, the impact of different optical feedback delays and strengths on the radio-frequency line width, the repetitions rate and thus the comb mode spacing are investigated experimentally. Feedback cavity lengths range from 6 m to 73 m. A dynamic mode spacing control from 2 to 22.5 MHz is demonstrated. A considerable reduction in RF line width from 20 kHz (free-running) to 2.5 kHz is reported. The experimental results are confirmed by a simple stochastic time-domain model [Drzewietzki et al., Opt. Express 21 (2013) 16142; Auth et al., Electron. Lett. 54 (2018), 374].