Impact of the saturable absorber on the linewidth enhancement factor of hybrid silicon quantum dot comb lasers (Student paper)

Thibaut Renaud (1, 2) , Heming Huang (1, 2) , Geza Kurczveil (3) , R G Beausoleil (3) , Frédéric Grillot (1, 2, 4)

1 GTO - Télécommunications Optiques
2 COMELEC - Département Communications & Electronique
3 HP Labs
4 The University of New Mexico [Albuquerque]

This work investigates the effects of the saturable absorber on the linewidth enhancement factor of hybrid silicon quantum dot comb lasers, which is a key parameter involved in frequency comb generation. Experiments have been performed on two carefully chosen laser devices sharing the same gain material and cavity design, with and without saturable absorber. The results unveil that the increase of the reversed bias on the absorber drives up the linewidth enhancement factor, which gives birth to the comb spectrum. This paper brings insights on the fundamental aspects of comb lasers and provides concepting guidelines of future on-chip light sources for integrated wavelength-division multiplexing applications. Keywords: Quantum dots, frequency combs, linewidth enhancement factor, silicon photonics.

Mots clés: Quantum dots frequency combs linewidth enhancement factor silicon photonics; Quantum dots; Frequence combs; Linewidth enhancement factor; Silicon photonics

Domaines: Sciences de l'ingénieur [physics]

Thibaut Renaud, Heming Huang, Geza Kurczveil, R G Beausoleil, Frédéric Grillot. Impact of the saturable absorber on the linewidth enhancement factor of hybrid silicon quantum dot comb lasers (Student paper). 2023 European Conference on Integrated Optics (ECIO), Apr 2023, Twente, Netherlands. ⟨hal-04559961⟩