30 research outputs found
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Optical multi-stability in a nonlinear high-order microring resonator filter
We theoretically analyze and experimentally demonstrate optical bi-stability and multi-stability in an integrated nonlinear high-order microring resonator filter based on high-index contrast doped silica glass. We use a nonlinear model accounting for both the Kerr and thermal effects to analyze the instability behavior of the coupled-resonator based filter. The model also accurately predicts the multi-stable behavior of the filter when the input frequency is slightly detuned. To understand the role of the intracavity power distribution, we investigate the detuning of the individual rings of the filter from the optical response with a pump–probe experiment. Such a measurement is performed scanning the filter with a low-power probe beam tuned a few free spectral ranges away from the resonance where the pump is coupled. A comprehensive understanding of the relationship between the nonlinear behavior and the intracavity power distribution for the high-order microring resonator filter will help the design and implementation of future all-optical switching systems using this type of filter
Maximizing the performance for microcomb based microwave photonic transversal signal processors
Microwave photonic (MWP) transversal signal processors offer a compelling
solution for realizing versatile high-speed information processing by combining
the advantages of reconfigurable electrical digital signal processing and
high-bandwidth photonic processing. With the capability of generating a number
of discrete wavelengths from micro-scale resonators, optical microcombs are
powerful multi-wavelength sources for implementing MWP transversal signal
processors with significantly reduced size, power consumption, and complexity.
By using microcomb-based MWP transversal signal processors, a diverse range of
signal processing functions have been demonstrated recently. In this paper, we
provide a detailed analysis for the processing inaccuracy that is induced by
the imperfect response of experimental components. First, we investigate the
errors arising from different sources including imperfections in the
microcombs, the chirp of electro-optic modulators, chromatic dispersion of the
dispersive module, shaping errors of the optical spectral shapers, and noise of
the photodetector. Next, we provide a global picture quantifying the impact of
different error sources on the overall system performance. Finally, we
introduce feedback control to compensate the errors caused by experimental
imperfections and achieve significantly improved accuracy. These results
provide a guide for optimizing the accuracy of microcomb-based MWP transversal
signal processors.Comment: 15 pages, 12 figures, 60 reference
METHODE NUMERIQUE POUR LA MODELISATION DE LA GENERATION D'IMPULSIONS ULTRA-COURTES DANS UN MICRO RESONATEUR OPTIQUE
International audienceOn présente une méthode de modélisation numérique de résonateurs optiques non-linéaires qui s'avère particulièrement adaptée pour l'étude de cavités optiques présentant des facteurs de qualité dépendants de la longueur d'onde. Cette méthode permet d'obtenir rapidement les paramètres de l'impulsion que le système supporte simplement en appliquant des conditions initiales adéquates. Cependant, la méthode ne tient pas compte des effets thermiques qui interviennent dans le système et qui sont d'une très forte importance dans la mise en place expérimentale de ce type de dispositif