Conference Paper

Linewidth Enhancement Factor of Semiconductor Lasers: Results from Round-Robin Measurements in COST 288 Action

Univ. of Zaragoza, Cuarte
DOI: 10.1109/CLEO.2007.4452795 Conference: Lasers and Electro-Optics, 2007. CLEO 2007. Conference on
Source: IEEE Xplore


Round-robin measurements on the linewidth enhancement factor are carried out within several laboratories participating to EU COST 288 action. The alpha-factor is measured by applying up to 7 different techniques. The obtained results are compared.

Download full-text


Available from: J. Rorison
  • Source
    • "Experimentally, various techniques have been proposed for the measurement of the LEF [51], [53]. In this work, we employ the widely used FM/AM technique for extracting the above-threshold LEF, while the ASE method is used for obtaining the below-threshold one. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The modulation dynamics and the linewidth enhancement factor of excited-state (ES) lasing quantum dot (QD) semiconductor lasers are investigated through a set of improved rate equation model, in which the contribution of off-resonant states to the refractive index change is taken into account. The ES laser exhibits a broader modulation response associated with a much lower chirp-to-power ratio in comparison with the ground-state (GS) lasing laser. In addition, it is found that the laser emission in ES reduces the linewidth enhancement factor of QD lasers by about 40% than that in GS. These properties make the ES lasing devices, especially InAs/InP ones emitting at (1.55~mu ) m, more attractive for direct modulation in high-speed optical communication systems.
    Full-text · Article · Dec 2014 · IEEE Journal of Quantum Electronics
  • Source
    • "The α-factor measurement technique developed by Hakki-Paoli [2] and its variants have been traditionally used to characterize materials for multiple longitudinal mode lasers, as it is based entirely on simple optical spectral measurements. However, the results obtained with this method have consistently shown a considerable disagreement with the behaviour of final single longitudinal-mode devices [3]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The linewidth enhancement factor of a Fabry-Perot laser is measured using the traditional Hakki-Paoli gain measurement and two proposed modifications to techniques used for single longitudinal mode lasers.
    Full-text · Conference Paper · May 2009
  • Source
    • "Using disclosed transmitter data [10], a realistic estimation is m =3. In our calculation we use a typical value of C =-3,6 [11]. We suppose that the chirp parameter is independent of the modulation frequency and the intensity [12]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: To increase the signal power in optical networks is crucial to extend the maximum transmission distance. However, the non- linear behavior of the optical fiber limits the signal power e.g. the span of the all-optical network. This paper presents an ana- lytical model and calculation results for the signal quality degradation in an 8-channel and in an 18-channel, 2.5 Gbps coarse wavelength-division-multiplexing (CWDM) system. Based on the proposed model and performed analysis we give the optimal value of the signal power at the transmitter point. The modeling of chromatic dispersion and Raman-scattering, the two main constraints of CWDM optical networks is also presented in detail.
    Full-text · Article ·
Show more