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Theses

Source d'impulsions brèves à 1,55µm en laser à cavité verticale externe pour application à l'échantillonnage optique linéaire

Abstract : This thesis focuses on the development, fabrication and use of optically pumped vertical external cavity surface emitting lasers (VECSEL), to achieve short pulse sources at high repetition rate emitting at 1550nm. These sources are opening the door to interesting applications in optical communications to achieve very high repetition rate transmitters, or high speed linear optical sampling The objectives of this thesis were, in a first step, to develop and implement VECSEL structures containing an active zone formed by GaAlInAs/InP quantum wells located at the anti-nodes of the resonant electric field, positioned on a Bragg mirror, all this being bonded to a substrate of good thermal conductivity. For this, we have designed structures optimizing the evacuation of heat generated in the active zone. This has greatly improved the VECSEL performances, especially their output power. The VECSEL performances were evaluated in a simple cavity with two mirrors (plane-concave). The second point was to develop and implement SESAM structures which, owing to their nonlinear characteristics, would allow a passively mode-locked laser operation. The structures contained InGaAsN/GaAs quantum wells. The studied parameters were the number of quantum wells, and the resonant or anti-resonant behavior of the structure. The linear and nonlinear optical characterizations were used to optimize the SESAM structure and estimate their performances. Finally, the compatibility between the VECSEL and SESAM structures, in terms of modulation depth and resonance wavelength, made it possible to obtain the passive mode locking operation. The obtained pulses show two different behaviors depending on the dispersion properties of the structures. With low dispersion, we have made the first demonstration of a passively mode-locked VECSEL at 1550nm, operating at room temperature. An all-optical sampling device implementing the linear optical sampling technique using short laser pulses has been realized and tested. This device will allow displaying eye diagrams and constellation diagrams with an expected sensitivity around -20dBm of average power. Testing the device allowed to visualize the acquisition of very high repetition rate signals (40 Gb/s).
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Aghiad Khadour. Source d'impulsions brèves à 1,55µm en laser à cavité verticale externe pour application à l'échantillonnage optique linéaire. Sciences de l'ingénieur [physics]. Ecole Polytechnique X, 2009. Français. ⟨tel-00467637⟩

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