Nonlinear characterization and modeling of periodically poled lithium niobate waveguides for 1.5-μm-band cascaded wavelength conversion

Cristiani, Ilaria; Liberale, Carlo; Degiorgio, Vittorio; Tartarini, Giovanni; Bassi, Paolo

doi:10.1016/s0030-4018(00)01099-3

Cited by 14 publications

(8 citation statements)

References 17 publications

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“…6(a). The discrepancy between experiment and theory can be explained by considering the waveguide inhomogeneities [51][52][53][54]. Inhomogeneity of the waveguide channel, e.g.…”

Section: Ii2 Spectral Characterisationmentioning

confidence: 99%

Heralded generation of high-purity ultrashort single photons in programmable temporal shapes

Ansari¹,

Roccia²,

Santandrea³

et al. 2018

Opt. Express

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We experimentally demonstrate a source of nearly pure single photons in arbitrary temporal shapes heralded from a parametric down-conversion (PDC) source at telecom wavelengths. The technology is enabled by the tailored dispersion of in-house fabricated waveguides with shaped pump pulses to directly generate the PDC photons in on-demand temporal shapes. We generate PDC photons in Hermite-Gauss and frequency-binned modes and confirm a minimum purity of 0.81, even for complex temporal shapes.Preparing single photons in pure and controlled spectral-temporal modes is a key requirement for quantum photonic technologies. Diverse applications including quantum-enhanced metrology [1,2], quantum computation [3,4], and quantum encryption [5][6][7] rely on high-contrast interference through stable sources of pure single photons. In addition, widely customisable and precisely controllable temporal-mode shaping is necessary to ensure mode matching between individual sources [8], facilitate coupling between nodes in a quantum network [9], and enable temporal-mode based quantum communication [10] and source mupliplexing [11,12], among other applications. Furthermore, sources with high brightness are essential for scalable performance, and spatially single-mode behaviour is necessary for coupling to optical fibre networks and integrated waveguide devices.Sources based on parametric downconversion (PDC) have granted a simple solution to heralded single-photon generation for decades, but have not yet satisfied all of the above requirements simultaneously. Most PDC sources generate photons with strong spectral correlations which is undesirable for heralded single-photon sources. However, it is possible to minimise the spectral correlation in crystals offering specific dispersion properties along with an adapted pump bandwidth [8,[13][14][15][16][17][18][19][20][21]. This specific dispersion property is linked to the group velocities of the pump and the PDC photons and can be summarised in two categories: matching the group velocity of the pump photon with one of the PDC photons [8,20], or having the group velocity of the pump between the two PDC photons [15,[17][18][19].On the other hand, efficient temporal-mode shaping of the PDC photons is more challenging. Existing methods to create a broadband single photon in an arbitrary temporal mode rely on carving out the desired mode from the original wavepacket as depicted in Fig. 1(a), which can be accurately achieved by temporal or spectral modulation of the photon [22][23][24][25][26]. This method, however, necessarily introduces loss and leads to a reduced rate of pre- * vahid.ansari@uni-paderborn.de With an appropriately designed pump field and group-velocity engineered nonlinear medium, the PDC photons are emitted directly in a desired temporal shape. In both scenarios the purity of heralded single photon rely on the separability of the PDC state in terms of signal and herald fields.pared photons [27] and a low pair-symmetric heralding efficiencies [28]; this poses a practical lim...

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“…6(a). The discrepancy between experiment and theory can be explained by considering the waveguide inhomogeneities [51][52][53][54]. Inhomogeneity of the waveguide channel, e.g.…”

Section: Ii2 Spectral Characterisationmentioning

confidence: 99%

Heralded generation of high-purity ultrashort single photons in programmable temporal shapes

Ansari¹,

Roccia²,

Santandrea³

et al. 2018

Opt. Express

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show abstract

“…We modelled our experimental results with a finite element solver, able to study anisotropic waveguides both in guided [7] and leaky [8] regimes. The simulation program utilizes a particular kind of radiation boundary conditions which have proved to give optimal results in the determination of the complex propagation constant β c =β-j α of leaky modes, where β is the phase constant of the mode analyzed and α is the term which accounts for the radiation losses of the mode.…”

Section: Simulationsmentioning

confidence: 99%

Tunable Bandpass Filter based on Photonic Crystal Fiber filled with Multiple Liquid Crystals

Scolari

Tartarini

Borelli

et al. 2007

LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings

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“…The fiber described above will then be studied utilizing a finite element method (FEM) solver, able to study anisotropic waveguides with arbitrary dielectric tensors both in guided (Cristiani et al 2001) and leaky (Tartarini et al 2005) regimes. In order to put into account the splay alignment of the mesogens, each of the LC-filled capillaries has been approximated dividing its cross section into 24 regions.…”

Section: Fiber Theoretical Modelmentioning

confidence: 99%

“…In this paper, we will report results of a rigorous electromagnetic analysis, performed using the finite element method (FEM) (Saitoh et al 2003;Rahman et al 2006), and discuss such results obtaining highlights of the physics of the modes propagating in such structures, which will explain their exotic behavior. The FEM code we used is particularly suited to this problem as it has been developed to determine guided and leaky modes in waveguides which exhibit a general anisotropy (Tartarini 2000;Cristiani et al 2001;Tartarini et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Spectral properties of liquid crystal photonic bandgap fibres with splay-aligned mesogens

et al. 2007

Self Cite

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Through a detailed electromagnetic analysis we investigate the characteristics of liquid crystal infiltrated photonic crystal Fibers guiding by the Photonic Bandgap effect. The analysis, carried out using the Finite Element Method and including also material dispersion effects, puts into evidence particular spectral features related to the so-called splay alignment of the molecules constituting the liquid crystal, the so called mesogens. Control of these features is of use in the design of new devices for sensing or telecommunication applications.

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Nonlinear characterization and modeling of periodically poled lithium niobate waveguides for 1.5-μm-band cascaded wavelength conversion

Cited by 14 publications

References 17 publications

Heralded generation of high-purity ultrashort single photons in programmable temporal shapes

Heralded generation of high-purity ultrashort single photons in programmable temporal shapes

Tunable Bandpass Filter based on Photonic Crystal Fiber filled with Multiple Liquid Crystals

Spectral properties of liquid crystal photonic bandgap fibres with splay-aligned mesogens

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