DE MICHELI , Marc

The purpose of this article is to show that efficient light coupling in lithium niobate waveguides presenting a strongly confined mode, such as photonic wires, is possible with the use of a periodically segmented waveguide coupler. The coupler consists in an input periodically segmented waveguide whose mode size is adapted to the mode of a...

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We theoretically and numerically study the difference frequency generation and the signal amplification bandwidth together with the pump wavelength acceptance for counterpropagating optical parametric amplifiers. It is shown that the specific advantage of those amplifiers is that the DFG and amplification bandwidth is much narrower than in a...

In optical parametric oscillators based on periodically poled (PP) non-linear quadratic materials, choosing a submicronic poling period allows generating the phase-matched signal and idler waves in opposite directions. In this case a distributed feedback mechanism is established, which enables optical parametric oscillation without the need of...

We model a backward mirrorless optical parametric oscillator in a fragmented GaN waveguide consisting in a sequence of submicronic periodically poled elements separated by uniformly polarized connection sections representing stitching errors. We find that the generated coherent phase of the backscattered wave locks the phases of the forward...

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The present paper focuses on the theoretical characterization and simulation of different graded index segmented LiNbO3 waveguides. Several dependencies of the refractive index versus the z direction of propagation of the applied laser field are examined and a comparative discussion is made, taking into account dispersive and attenuation losses.

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We propose a new proton exchange process to reproducibly realize on lithium niobate highly confining (δne = 0.1) planar waveguides without degrading the nonlinear coefficient of the crystal. Waveguides were fabricated with different acidic baths and the crystallographic changes, the index profiles and the local SHG response were measured. We...

Imperfections of the periodic material impact the performances of Quasi Phase Matched devices. Our numerical study allows predicting the impact of stitching errors on the nonlinear interactions in waveguides using domains induced by e-beam writing in Lithium Niobate and explaining the observed experimental results.

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L'intérêt des guides enterrés en optique non linéaire intégrée est connu de longue date, mais la réalisation de guides performants dans des matériaux fortement non linéaire est restée compliquée. Nous présentons ici les premiers résultats encourageants obtenus grâce à une nouvelle technique d'échange protonique sur niobate de lithium.

—We propose a new proton exchange process to repro-ducibly realize on lithium niobate highly confining (δne = 0.1) planar waveguides without degrading the nonlinear coefficient of the crystal. Waveguides were fabricated with different acidic baths and the crystallographic changes, the index profiles and the local SHG response were measured. We...

International audience

International audience

International audience

International audience

International audience

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We investigate an integrated optical circuit on lithium niobate designed to implement a teleportation-based quantum relay scheme for one- way quantum communication at a telecom wavelength. Such an advanced quantum circuit merges for the first time both optical-optical and electro-optical nonlinear functions necessary for implementing the...

L'augmentation des distances de communication quantique passe par le développement de nouvelles sources de photons uniques et de paires de photons intriqués de plus en plus efficaces et émettant aux longueurs d'ondes des télécommunications. Ceci permet la transmission des photons à l'aide de fibres optiques avec un minimum de pertes à la...