title: Heterogeneously integrated III-V/silicon dual-mode distributed feedback laser array for terahertz generation.
abstract: We demonstrate an integrated distributed feedback (DFB) laser array as a dual-wavelength source for narrowband terahertz (THz) generation. The laser array is composed of four heterogeneously integrated III-V-on-silicon DFB lasers with different lengths enabling dual-mode lasing tolerant to process variations, bias fluctuations, and ambient temperature variations. By optical heterodyning the two modes emitted by the dual-wavelength DFB laser in the laser array using a THz photomixer composed of an uni-traveling carrier photodiode (UTC-PD), a narrow and stable carrier signal with a frequency of 0.357 THz is generated. The central operating frequency and the emitted terahertz wave linewidth are analyzed, along with their dependency on the bias current applied to the laser diode and ambient temperature.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Shao
authors.forename: Shahram
authors.initials: S
authors.lastname: Keyvaninia
authors.forename: Mathias
authors.initials: M
authors.lastname: Vanwolleghem
authors.forename: Guillaume
authors.initials: G
authors.lastname: Ducournau
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Jiang
authors.forename: Geert
authors.initials: G
authors.lastname: Morthier
authors.forename: Jean-Francois
authors.initials: JF
authors.lastname: Lampin
authors.forename: Gunther
authors.initials: G
authors.lastname: Roelkens