9 May 2018 Optical feedback stabilization of a frequency comb generated by a self-mode-locked quantum dot laser emitting at 1255 nm
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Abstract
In this contribution we investigate experimentally and by modeling the mode spacing tuning range and stability of optical frequency comb lines generated by a 1 mm long self mode-locked single section quantum dot semiconductor laser subject to dual-cavity all optical self-feedback. The external optical feedback cavities have an optical length of 9.4 m and 16.5 m and are implemented by optical fibers. The optical feedback strengths are below 0.02% back reflected onto the as-cleaved laser facet. The line-width of the laser mode-beating frequency equals optical frequency mode spacing of 40.67 GHz amounts to 1.4 MHz in the free-running case. By fine-delay tuning of both optical feedback lengths, we find a comb-line spacing tuning range of 70 MHz. The radio-frequency linewidth decreases by a factor of 700 down to 2 kHz for particular adjusted optical feedback cavity lengths, thus improve the mode spacing stability. We validate the experimental findings by a simple and universal stochastic time-domain model.
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Sebastian Stutz, Sebastian Stutz, Dominik Auth, Dominik Auth, Christoph Weber, Christoph Weber, Oleg Nikiforov, Oleg Nikiforov, Luke F. Lester, Luke F. Lester, Thomas Walther, Thomas Walther, Stefan Breuer, Stefan Breuer, } "Optical feedback stabilization of a frequency comb generated by a self-mode-locked quantum dot laser emitting at 1255 nm", Proc. SPIE 10682, Semiconductor Lasers and Laser Dynamics VIII, 1068222 (9 May 2018); doi: 10.1117/12.2307551; https://doi.org/10.1117/12.2307551
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