Influence of the cavity design on the differential gain and linewidth enhancement factor of a QD comb laser

Thibaut Renaud; Heming Huang; Géza Kurczveil; Raymond G. Beausoleil; Di Liang; Frédéric Grillot

doi:10.1117/12.2624500

20 May 2022 Influence of the cavity design on the differential gain and linewidth enhancement factor of a QD comb laser

Thibaut Renaud, Heming Huang, Géza Kurczveil, Raymond G. Beausoleil, Di Liang, Frédéric Grillot

Proceedings Volume 12141, Semiconductor Lasers and Laser Dynamics X; 1214108 (2022) https://doi.org/10.1117/12.2624500
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

This work investigates the effects of the confinement factor on the linewidth enhancement factor in hybrid silicon quantum dot comb lasers, which is a key parameter involved in frequency comb generation. Experiments are performed on two laser devices sharing the same gain material with slightly different cavity designs resulting in different confinement factors. The results highlight that a lower confinement factor leads to a smaller carrier-induced refractive index variation and a larger differential gain, together resulting in a smaller linewidth enhancement factor, which in turn translates into different sets of performance regarding the feedback applications. This paper brings novel insights on the fundamental aspects of quantum dot comb lasers and provides new guidelines of future on-chip light sources for integrated wavelength-division multiplexing applications.

Conference Presentation

Citation Download Citation

Thibaut Renaud, Heming Huang, Géza Kurczveil, Raymond G. Beausoleil, Di Liang, and Frédéric Grillot "Influence of the cavity design on the differential gain and linewidth enhancement factor of a QD comb laser", Proc. SPIE 12141, Semiconductor Lasers and Laser Dynamics X, 1214108 (20 May 2022); https://doi.org/10.1117/12.2624500

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