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Contribution à la caractérisation des impulsions ultra-courtes à l’aide de sources laser rapidement accordables

Abstract : Optical swept sources are distinguished by the ability to change their output wavelength in a continuous manner over time. They are used in many applications such as telecommunications, spectroscopy and optical coherence tomography. They are mainly characterized by a narrow instantaneous linewidth, a high sweep rate and a wide tuning range. The advantages of swept sources open the way to other types of applications such as the characterization of ultrashort pulses for example. Generally, these pulses are characterized using nonlinear methods which are slow and too complicated. We have proposed a novel approach based on swept sources for the characterization of ultrashort pulses. By using a linearly wavelength-swept semiconductor laser like SG-DBR (Sampled-Grating Distributed Bragg Reflector), we can scan the entire optical spectrum of the pulses under test in a single measurement. The beat signal between the swept source and the pulsed laser is then used to measure the spectral amplitude and phase of all modes which gives access to the temporal shape of the pulse. The main advantage of our approach is that the entire characterization process is done in a single fast measurement. Indeed, the high sweep rate of the swept source offers the possibility of having real time measurements. In addition, thanks to the wide tuning range, this technique is completely independent of the pulse under test, it requires no prior knowledge of the various properties of the pulse such as the repetition frequency, the number of modes or the frequency of each mode
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https://tel.archives-ouvertes.fr/tel-01943783
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Submitted on : Tuesday, December 4, 2018 - 10:43:30 AM
Last modification on : Monday, August 24, 2020 - 4:16:12 PM

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  • HAL Id : tel-01943783, version 1

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Mokhtar Korti. Contribution à la caractérisation des impulsions ultra-courtes à l’aide de sources laser rapidement accordables. Traitement du signal et de l'image [eess.SP]. Institut National des Télécommunications; Université Abou Bekr Belkaid (Tlemcen, Algérie), 2018. Français. ⟨NNT : 2018TELE0014⟩. ⟨tel-01943783⟩

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