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Papers by Roger Ibrahim

Research paper thumbnail of Amélioration de la dynamique de stabilisation des EDFA grâce à l’insertion d’un amplificateur optique à semiconducteur

Research paper thumbnail of Erbium-Doped-Fiber Characterization: Dynamic Study of Laser Ring Cavity Based on a General Model

Journal of Lightwave Technology, 2000

ABSTRACT In this paper, we propose and demonstrate an original exploitation of relaxation oscilla... more ABSTRACT In this paper, we propose and demonstrate an original exploitation of relaxation oscillations of erbium-doped-fiber laser ring resonators based on a general model for Er cross-sectional characterization. Its main advantage as compared to other existing exploitations relies on the fact that only weak approximations relative to spatial light distribution in the laser are imposed. It is therefore applicable to various resonator configurations, i.e., independent of the active-media length and losses encountered during the single-pass loop propagation. An experimental demonstration is finally presented by comparing the extracted erbium parameters (intrinsic saturation power and absorption) to those obtained with other methods.

Research paper thumbnail of EDFA gain stabilization with fast transient behavior by use of a semiconductor optical amplifier

Quantum Electronics and Laser Science Conference, 2007

We propose a solution to improve gain-clamped EDFA stabilization time by inserting in the convent... more We propose a solution to improve gain-clamped EDFA stabilization time by inserting in the conventional laser loop configuration an extra SOA. Experimental results demonstrate stabilization time as short as 0.2¿s in a purposely-considered critical situation.

Research paper thumbnail of Amélioration de la dynamique de stabilisation des EDFA grâce à l’insertion d’un amplificateur optique à semiconducteur

Research paper thumbnail of Erbium-Doped-Fiber Characterization: Dynamic Study of Laser Ring Cavity Based on a General Model

Journal of Lightwave Technology, 2000

ABSTRACT In this paper, we propose and demonstrate an original exploitation of relaxation oscilla... more ABSTRACT In this paper, we propose and demonstrate an original exploitation of relaxation oscillations of erbium-doped-fiber laser ring resonators based on a general model for Er cross-sectional characterization. Its main advantage as compared to other existing exploitations relies on the fact that only weak approximations relative to spatial light distribution in the laser are imposed. It is therefore applicable to various resonator configurations, i.e., independent of the active-media length and losses encountered during the single-pass loop propagation. An experimental demonstration is finally presented by comparing the extracted erbium parameters (intrinsic saturation power and absorption) to those obtained with other methods.

Research paper thumbnail of EDFA gain stabilization with fast transient behavior by use of a semiconductor optical amplifier

Quantum Electronics and Laser Science Conference, 2007

We propose a solution to improve gain-clamped EDFA stabilization time by inserting in the convent... more We propose a solution to improve gain-clamped EDFA stabilization time by inserting in the conventional laser loop configuration an extra SOA. Experimental results demonstrate stabilization time as short as 0.2¿s in a purposely-considered critical situation.

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