Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster Session I
HL 13.81: Poster
Monday, March 12, 2018, 17:30–19:30, Poster B
Optical frequency comb stabilization of a self-mode-locked quantum dot laser by optical time-delayed self-feedback — •Sebastian Stutz1, Dominik Auth1, Christoph Weber1, Oleg Nikiforov1, Luke F. Lester2, Thomas Walther1, and Stefan Breuer1 — 1Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany — 2Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
Optical frequency combs generated by self-mode-locked semiconductor lasers based on quantum dot (QD) gain material are ideal sources for application in high data rate optical communication, demanding tunable and stable comb-line spacing in the range of 40 GHz. In this work, the impact of fine-delay tunable dual-cavity optical feedback (DC-OFB) on the mode spacing and the optical frequency comb stability generated by a 1 mm long self-mode-locked single-section QD laser emitting at 1255 nm is studied experimentally and by simulation. The linewidth of the laser mode-beating frequency of 40.67 GHz amounts to 1.4 MHz in the of free running case. By fine-delay tuning of both optical feedback lengths, we find a comb-line spacing tuning range of 70 MHz. The beat note linewidth decreases to 2 kHz for well-adjusted optical feedback cavities. Simulation results based on a stochastic time-domain model [Drzewietzki et al., Opt. Expr. 21 (2013), 16142] reproduce the experimentally observed trends with good qualitative and quantitative agreement.