Gain Compression

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Frederic Grillot - One of the best experts on this subject based on the ideXlab platform.

  • Gain Compression effect on the modulation dynamics of an optically injection-locked semiconductor laser using Gain lever
    Physics and Simulation of Optoelectronic Devices XXIV, 2016
    Co-Authors: Jean-maxime Sarraute, Kevin Schires, Sophie Larochelle, Frederic Grillot
    Abstract:

    The modulation response of an optically-injected Gain lever semiconductor laser is studied and calculations show that a Gain-lever laser operating under medium to strong optical injection provides a unique and robust configuration for ultra large bandwidth enhancement. Modulation bandwidths above nine times the relaxation oscillation frequency of the free-running laser can be reached using injection-locking conditions that are reasonable for practical applications. The impact of the Gain Compression on the modulation dynamic is discussed for the first time. This work is of prime importance for the development of directly-modulated broadband optical sources for high-speed operation at 40 Gbps and beyond.

  • linewidth broadening factor and Gain Compression in quantum cascade lasers
    Proceedings of SPIE, 2016
    Co-Authors: Louise Jumpertz, Frederic Grillot, Florian Michel, Robert Pawlus, W Elsasser, Mathieu Carras, Kevin Schires
    Abstract:

    In addition to the phase uctuation induced by spontaneous emission, instantaneous carrier variations in semiconductor lasers generate coupling between optical Gain and refractive index. This coupling between phase and amplitude of the electric field in the optical cavity is driven by the linewidth enhancement factor, which is responsible for the optical linewidth broadening, occurrence of nonlinearities or Gain asymmetry, due to the curvature difierence between the conduction and valence bands. This key parameter typically takes values between 2 and 6 in interband lasers with quantum well or quantum dot active media. In quantum cascade lasers, since the lasing transition occurs between two subbands of the conduction band that have therefore similar curvatures, the linewidth enhancement factor was expected to be naught. However sub-threshold linewidth enhancement factor was measured taking values from -0.5 to 0.5 and the above-threshold linewidth enhancement factor at room temperature was found between 0.2 and 2.4. In this work, the linewidth enhancement factor of a mid-infrared quantum cascade laser emitting around 5.6 μm is measured using either the wavelength shift under optical feedback or self-mixing interferometry, resulting in values ranging from 0.8 to 3. Furthermore, a strong increase of the linewidth enhancement factor with the pump current was observed, that can be explained by a relatively large Gain Compression in such structures, of the order of 5 × 10-15 cm3.

  • Impact of the Gain model on the stability assessment in semiconductor DFB lasers
    Physics and Simulation of Optoelectronic Devices XXII, 2014
    Co-Authors: Ivan Aldaya, Cheng Wang, Frederic Grillot, Gabriel Campuzano, Christophe Gosset, Gerardo Castanon
    Abstract:

    Optical injection locking of semiconductor lasers has attracted significant attention due to its applications in laser analysis, modulation characteristic enhancement, and nonlinear dynamics. In many cases, the analysis of the optically injected laser is done by simulation, requiring an accurate laser model and, therefore, an adequate modeling of the Gain Compression at high photon densities. We use the Kobayashi-Lang rate equations to numerically compare the stable locking range considering four different Gain models. Results reveal that at low bias currents, Gain Compression is significant only under weak injection regime. In contrast, for higher bias current, Gain Compression must be considered both in weak and strong injection regimes.

  • Modelling the Gain Compression effects in semiconductor quantum-dot lasers through a new modulation transfer function
    2012
    Co-Authors: Cheng Wang, Frederic Grillot, Jacky Even
    Abstract:

    Modelling the Gain Compression effects in semiconductor quantum-dot lasers through a new modulation transfer function

  • Modelling the Gain Compression effects on semiconductor quantum-dot laser through a new modulation transfer function
    IEEE Photonics Conference 2012, 2012
    Co-Authors: Cheng Wang, Frederic Grillot, Jacky Even
    Abstract:

    Impacts of Gain Compression on modulation properties of quantum dot lasers are investigated with a new modulation transfer function derived from a semi-analytical approach. Results show that non-linear Gain causes severe degradations in laser dynamics.

L. F. Lester - One of the best experts on this subject based on the ideXlab platform.

  • Gain Compression and above-threshold linewidth enhancement factor in 1.3μm InAs-GaAs quantum dot lasers
    IEEE Journal of Quantum Electronics, 2008
    Co-Authors: Frederic Grillot, J.-g. Provost, Béatrice Dagens, L. F. Lester
    Abstract:

    Quantum-dot (QD) lasers exhibit many useful properties such as low threshold current, temperature and feedback insensitivity, chirpless behavior, and low linewidth enhancement factor (alphaH-factor). Although many breakthroughs have been demonstrated, the maximum modulation bandwidth remains limited in QD devices, and a strong damping of the modulation response is usually observed pointing out the role of Gain Compression. This paper investigates the influence of the Gain Compression in a 1.3-mum InAs-GaAs QD laser and its consequences on the above-threshold alphaH-factor. A model is used to explain the dependence of the alphaH-factor with the injected current and is compared with AM/FM experiments. Finally, it is shown that the higher the maximum Gain, the lower the effects of Gain Compression and the lower the alphaH-factor. This analysis can be useful for designing chirpless QD lasers with improved modulation bandwidth as well as for isolator-free transmission under direct modulation.

  • Gain Compression and above threshold linewidth enhancement factor in 1 3 mu hbox m inas gaas quantum dot lasers
    IEEE Journal of Quantum Electronics, 2008
    Co-Authors: Frederic Grillot, Béatrice Dagens, J.-g. Provost, L. F. Lester
    Abstract:

    Quantum-dot (QD) lasers exhibit many useful properties such as low threshold current, temperature and feedback insensitivity, chirpless behavior, and low linewidth enhancement factor (alphaH-factor). Although many breakthroughs have been demonstrated, the maximum modulation bandwidth remains limited in QD devices, and a strong damping of the modulation response is usually observed pointing out the role of Gain Compression. This paper investigates the influence of the Gain Compression in a 1.3-mum InAs-GaAs QD laser and its consequences on the above-threshold alphaH-factor. A model is used to explain the dependence of the alphaH-factor with the injected current and is compared with AM/FM experiments. Finally, it is shown that the higher the maximum Gain, the lower the effects of Gain Compression and the lower the alphaH-factor. This analysis can be useful for designing chirpless QD lasers with improved modulation bandwidth as well as for isolator-free transmission under direct modulation.

  • Gain Compression and Above-Threshold Linewidth Enhancement Factor in 1.3- $\mu\hbox{m}$ InAs–GaAs Quantum-Dot Lasers
    IEEE Journal of Quantum Electronics, 2008
    Co-Authors: Frederic Grillot, Béatrice Dagens, J.-g. Provost, L. F. Lester
    Abstract:

    Quantum-dot (QD) lasers exhibit many useful properties such as low threshold current, temperature and feedback insensitivity, chirpless behavior, and low linewidth enhancement factor (alphaH-factor). Although many breakthroughs have been demonstrated, the maximum modulation bandwidth remains limited in QD devices, and a strong damping of the modulation response is usually observed pointing out the role of Gain Compression. This paper investigates the influence of the Gain Compression in a 1.3-mum InAs-GaAs QD laser and its consequences on the above-threshold alphaH-factor. A model is used to explain the dependence of the alphaH-factor with the injected current and is compared with AM/FM experiments. Finally, it is shown that the higher the maximum Gain, the lower the effects of Gain Compression and the lower the alphaH-factor. This analysis can be useful for designing chirpless QD lasers with improved modulation bandwidth as well as for isolator-free transmission under direct modulation.

  • Gain Compression coefficient and above threshold linewidth enhancement factor in inas gaas quantum dfb lasers
    Physics and simulation of optoelectronic devices. Conference, 2005
    Co-Authors: L Zhang, A L Gray, R H Wang, P M Varangis, L. F. Lester
    Abstract:

    We measure, for the first time, the Gain Compression coefficient and above-threshold linewidth enhancement factor (alpha parameter) in quantum dot (QD) distributed feedback lasers (DFB) by time-resolved-chirp (TRC) characterization. The alpha parameter is measured to be 2.6 at threshold and increases to 8 when the output power of the QD DFB is increased to 3 mW. The dependence of the above-threshold alpha parameter on the optical power is found to be stronger than the optical Gain Compression effect alone can predict. The inhomogeneous Gain broadening, Gain saturation at the ground states and carrier filling in the excited states in QDs are proposed to explain the results.

  • Gain Compression coefficient and above-threshold linewidth enhancement factor in InAs/GaAs quantum DFB lasers
    Physics and Simulation of Optoelectronic Devices XIII, 2005
    Co-Authors: L Zhang, A L Gray, R H Wang, P M Varangis, L. F. Lester
    Abstract:

    We measure, for the first time, the Gain Compression coefficient and above-threshold linewidth enhancement factor (alpha parameter) in quantum dot (QD) distributed feedback lasers (DFB) by time-resolved-chirp (TRC) characterization. The alpha parameter is measured to be 2.6 at threshold and increases to 8 when the output power of the QD DFB is increased to 3 mW. The dependence of the above-threshold alpha parameter on the optical power is found to be stronger than the optical Gain Compression effect alone can predict. The inhomogeneous Gain broadening, Gain saturation at the ground states and carrier filling in the excited states in QDs are proposed to explain the results.

Ernesto Ciaramella - One of the best experts on this subject based on the ideXlab platform.

  • All-optical 40 Gbits/s packet regeneration by means of cross-Gain Compression in a semiconductor optical amplifier.
    Optics letters, 2008
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Sumanta Gupta, Marco Presi, Ernesto Ciaramella
    Abstract:

    We experimentally demonstrate all-optical reshaping of 40 Gbits/s packets by using cross-Gain Compression in a semiconductor optical amplifier (SOA). This scheme, which is based on cross-saturation effects between two conjugate signals copropagating in a single SOA, is wavelength preserving and polarization independent and does not suffer from any transient effect at packet edges. We report evidence of noise redistribution and packet reshaping by means of the bit-error rate versus threshold measurements for different input optical signal-to-noise ratios.

  • 40 Gb/s packet reshaping with no wavelength shift using SOA cross Gain Compression
    2008 Conference on Lasers and Electro-Optics, 2008
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Sumanta Gupta, Marco Presi, Ernesto Ciaramella
    Abstract:

    We experimentally demonstrate a scheme for reshaping 40 Gb/s packets that is wavelength-preserving. The scheme, based on cross-Gain-Compression in an SOA, is polarization-independent and does not suffer from any transient effect at packet edges.

  • Cross-Gain Compression in Semiconductor
    2007
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, Ernesto Ciaramella
    Abstract:

    In this paper, we present a novel scheme that exploits cross-Gain modulation (XGM) in semiconductor optical amplifiers (SOAs) without overall pattern effects. This technique uses two signals with reversed-intensity modulation and different wave- length to exploit propagation and Gain-Compression dynamics in Gain-saturated SOAs at almost constant overall input power. The resulting cross-Gain-Compression mechanism between copropagat- ing waves can lead to all-optical waveform reshaping. By using this technique, we experimentally demonstrate enhanced wavelength conversion by XGM and wavelength-preserving noise Compression at 10 Gb/s. Index Terms—All-optical regeneration, cross-Gain Compression (XGC), cross-Gain modulation (XGM), semiconductor optical am- plifier (SOA), wavelength conversion.

  • Cross-Gain Compression in Semiconductor Optical Amplifiers
    Journal of Lightwave Technology, 2007
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, Ernesto Ciaramella
    Abstract:

    In this paper, we present a novel scheme that exploits cross-Gain modulation (XGM) in semiconductor optical amplifiers (SOAs) without overall pattern effects. This technique uses two signals with reversed-intensity modulation and different wavelength to exploit propagation and Gain-Compression dynamics in Gain-saturated SOAs at almost constant overall input power. The resulting cross-Gain-Compression mechanism between copropagating waves can lead to all-optical waveform reshaping. By using this technique, we experimentally demonstrate enhanced wavelength conversion by XGM and wavelength-preserving noise Compression at 10 Gb/s

  • Evidence of noise Compression by cross Gain Compression in SOAs
    2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference, 2006
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, L. Giorgi, Ernesto Ciaramella
    Abstract:

    Effective Compression of the noise distributions in optical NRZ signals by exploiting cross-Gain-Compression in SOAs is reported. First transmission results show that this simple technique can be used for all-optical 2R regeneration without wavelength conversion.

Giampiero Contestabile - One of the best experts on this subject based on the ideXlab platform.

  • All-optical 40 Gbits/s packet regeneration by means of cross-Gain Compression in a semiconductor optical amplifier.
    Optics letters, 2008
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Sumanta Gupta, Marco Presi, Ernesto Ciaramella
    Abstract:

    We experimentally demonstrate all-optical reshaping of 40 Gbits/s packets by using cross-Gain Compression in a semiconductor optical amplifier (SOA). This scheme, which is based on cross-saturation effects between two conjugate signals copropagating in a single SOA, is wavelength preserving and polarization independent and does not suffer from any transient effect at packet edges. We report evidence of noise redistribution and packet reshaping by means of the bit-error rate versus threshold measurements for different input optical signal-to-noise ratios.

  • 40 Gb/s packet reshaping with no wavelength shift using SOA cross Gain Compression
    2008 Conference on Lasers and Electro-Optics, 2008
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Sumanta Gupta, Marco Presi, Ernesto Ciaramella
    Abstract:

    We experimentally demonstrate a scheme for reshaping 40 Gb/s packets that is wavelength-preserving. The scheme, based on cross-Gain-Compression in an SOA, is polarization-independent and does not suffer from any transient effect at packet edges.

  • Cross-Gain Compression in Semiconductor
    2007
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, Ernesto Ciaramella
    Abstract:

    In this paper, we present a novel scheme that exploits cross-Gain modulation (XGM) in semiconductor optical amplifiers (SOAs) without overall pattern effects. This technique uses two signals with reversed-intensity modulation and different wave- length to exploit propagation and Gain-Compression dynamics in Gain-saturated SOAs at almost constant overall input power. The resulting cross-Gain-Compression mechanism between copropagat- ing waves can lead to all-optical waveform reshaping. By using this technique, we experimentally demonstrate enhanced wavelength conversion by XGM and wavelength-preserving noise Compression at 10 Gb/s. Index Terms—All-optical regeneration, cross-Gain Compression (XGC), cross-Gain modulation (XGM), semiconductor optical am- plifier (SOA), wavelength conversion.

  • Cross-Gain Compression in Semiconductor Optical Amplifiers
    Journal of Lightwave Technology, 2007
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, Ernesto Ciaramella
    Abstract:

    In this paper, we present a novel scheme that exploits cross-Gain modulation (XGM) in semiconductor optical amplifiers (SOAs) without overall pattern effects. This technique uses two signals with reversed-intensity modulation and different wavelength to exploit propagation and Gain-Compression dynamics in Gain-saturated SOAs at almost constant overall input power. The resulting cross-Gain-Compression mechanism between copropagating waves can lead to all-optical waveform reshaping. By using this technique, we experimentally demonstrate enhanced wavelength conversion by XGM and wavelength-preserving noise Compression at 10 Gb/s

  • Evidence of noise Compression by cross Gain Compression in SOAs
    2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference, 2006
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, L. Giorgi, Ernesto Ciaramella
    Abstract:

    Effective Compression of the noise distributions in optical NRZ signals by exploiting cross-Gain-Compression in SOAs is reported. First transmission results show that this simple technique can be used for all-optical 2R regeneration without wavelength conversion.

Roberto Proietti - One of the best experts on this subject based on the ideXlab platform.

  • all optical 40 gbits s packet regeneration by means of cross Gain Compression in a semiconductor optical amplifier
    Optics Letters, 2008
    Co-Authors: G Contestabile, Roberto Proietti, Sumanta Gupta, Marco Presi, E Ciaramella
    Abstract:

    We experimentally demonstrate all-optical reshaping of 40 Gbits/s packets by using cross-Gain Compression in a semiconductor optical amplifier (SOA). This scheme, which is based on cross-saturation effects between two conjugate signals copropagating in a single SOA, is wavelength preserving and polarization independent and does not suffer from any transient effect at packet edges. We report evidence of noise redistribution and packet reshaping by means of the bit-error rate versus threshold measurements for different input optical signal-to-noise ratios.

  • All-optical 40 Gbits/s packet regeneration by means of cross-Gain Compression in a semiconductor optical amplifier.
    Optics letters, 2008
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Sumanta Gupta, Marco Presi, Ernesto Ciaramella
    Abstract:

    We experimentally demonstrate all-optical reshaping of 40 Gbits/s packets by using cross-Gain Compression in a semiconductor optical amplifier (SOA). This scheme, which is based on cross-saturation effects between two conjugate signals copropagating in a single SOA, is wavelength preserving and polarization independent and does not suffer from any transient effect at packet edges. We report evidence of noise redistribution and packet reshaping by means of the bit-error rate versus threshold measurements for different input optical signal-to-noise ratios.

  • 40 Gb/s packet reshaping with no wavelength shift using SOA cross Gain Compression
    2008 Conference on Lasers and Electro-Optics, 2008
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Sumanta Gupta, Marco Presi, Ernesto Ciaramella
    Abstract:

    We experimentally demonstrate a scheme for reshaping 40 Gb/s packets that is wavelength-preserving. The scheme, based on cross-Gain-Compression in an SOA, is polarization-independent and does not suffer from any transient effect at packet edges.

  • Cross-Gain Compression in Semiconductor
    2007
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, Ernesto Ciaramella
    Abstract:

    In this paper, we present a novel scheme that exploits cross-Gain modulation (XGM) in semiconductor optical amplifiers (SOAs) without overall pattern effects. This technique uses two signals with reversed-intensity modulation and different wave- length to exploit propagation and Gain-Compression dynamics in Gain-saturated SOAs at almost constant overall input power. The resulting cross-Gain-Compression mechanism between copropagat- ing waves can lead to all-optical waveform reshaping. By using this technique, we experimentally demonstrate enhanced wavelength conversion by XGM and wavelength-preserving noise Compression at 10 Gb/s. Index Terms—All-optical regeneration, cross-Gain Compression (XGC), cross-Gain modulation (XGM), semiconductor optical am- plifier (SOA), wavelength conversion.

  • Cross-Gain Compression in Semiconductor Optical Amplifiers
    Journal of Lightwave Technology, 2007
    Co-Authors: Giampiero Contestabile, Roberto Proietti, Nicola Calabretta, Ernesto Ciaramella
    Abstract:

    In this paper, we present a novel scheme that exploits cross-Gain modulation (XGM) in semiconductor optical amplifiers (SOAs) without overall pattern effects. This technique uses two signals with reversed-intensity modulation and different wavelength to exploit propagation and Gain-Compression dynamics in Gain-saturated SOAs at almost constant overall input power. The resulting cross-Gain-Compression mechanism between copropagating waves can lead to all-optical waveform reshaping. By using this technique, we experimentally demonstrate enhanced wavelength conversion by XGM and wavelength-preserving noise Compression at 10 Gb/s

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