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Développement d'un banc de mesure de la forme d'onde de signaux dynamiques complexes par échantillonnage électro-optique

Abstract : We highlight a method and we set up the experiment for the characterization of waveforms up to 100 GHz, by electro-optic sampling. Electro-optical sampling allows to determine ultra fast pulses generated by a photodiode in a coplanar waveguide. In our system, high-speed electrical waveforms are sampled by a train of ultra-short laser pulses via the electro-optic effect. The laser beam is split into two parts. One part of the laser beam excites the photodiode, which generates electrical pulses propagating onto a coplanar waveguide fabricated on a glass substrate. The other part of the laser beam passes through a variable optical delay and crosses an electro-optic material placed on the coplanar waveguide. The electric field between the coplanar waveguide conductors changes the polarization of the optical beam passing through the electro-optical material via the electro-optic effect. The change of polarization can be converted to an amplitude variation which can be measured. For a fixed path delay between the two beams, the sampling pulses intercept repetitively one small portion of the electrical pulse waveform. We can adjust the delay to record the temporal evolution of the electrical pulse waveform. We use a 3D electromagnetic simulation software to optimize the electro-optic structure consisting of a coplanar waveguide on which is placed an electro-optic strip. We design 144 coplanar waveguides on a glass substrate and a calibration kit for the calibration of a vector network analyser used for determining the optimal structure into real working conditions. Then we use this structure for the waveform reconstruction of the electrical pulse generated by the photodiode.
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Submitted on : Friday, July 5, 2013 - 11:34:27 AM
Last modification on : Wednesday, October 20, 2021 - 3:19:19 AM
Long-term archiving on: : Sunday, October 6, 2013 - 4:13:42 AM

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  • HAL Id : tel-00841606, version 1

Citation

Wei Tian. Développement d'un banc de mesure de la forme d'onde de signaux dynamiques complexes par échantillonnage électro-optique. Physique Classique [physics.class-ph]. Université d'Angers, 2013. Français. ⟨tel-00841606⟩

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