Paper 14090-46
Paper 14090-46
Frequency comb generation in self-injected quantum-dash and quantum-well single-section mode-locked lasers: a comparison
On demand | Presented live 14 April 2026 
Abstract
We present a multidomain experimental comparison of single-section quantum-dash (QDash) and quantum-well (QWell) passively mode-locked lasers under identical operating and measurement conditions. Their behavior is investigated in both the RF and optical domains as functions of bias current and temperature. Static characterization establishes baseline performance, while RF characterization investigates the repetition frequency and RF linewidth of the beat-note signal and extends to timing jitter and long-term stability. Optical measurements characterize the spectrum in terms of central wavelength, spectral bandwidth, number of modes, and the optical linewidth of individual modes. Several results diverge from previously reported trends, revealing contrasting performance between QDash and QWell devices. The study further examines the effects of short and long external optical feedback on their dynamic behavior.
Presenter
Youcef Driouche
Ctr. de Nanosciences et de Nanotechnologies (France)
Youcef Driouche is a researcher in photonics and optical communications. He obtained his PhD in Telecommunications from the University of 8 Mai 1945 Guelma, Algeria, where he developed all-optical systems for laser pulse shaping. After two years as a postdoctoral researcher at Télécom SudParis, Institut Polytechnique de Paris, he joined the Centre de Nanosciences et de Nanotechnologies (C2N) as a postdoctoral fellow. His current research focuses on quantum-dot, quantum-dash, and quantum-well semiconductor lasers, as well as optical frequency comb generation and ultrafast photonic systems. He has published in leading IEEE and Optica journals and has extensive teaching experience in laser and optical transmission technologies.