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In this paper, we study the possible parametric down conversion processes ina periodically poled customized Lithium Niobate (LiNbO3) ridge waveguide. Ouranalysis of spontaneous parametric down-conversion (SPDC), first, with aGaussian pump beam mode and second, with an anti-symmetric Hermite-Gaussian HG(1,0) pump beam mode predict the possible down conversion processes in eachcase. From our JSA analysis, it is evident that the generated photons pairs inall these cases are negatively correlated and have orthogonal polarizations. Incase of the former, degenerate photon pairs are emitted at 1550 nm with thehighest efficiency in the fundamental waveguide mode. While, in case of thelatter, non-degenerate photon pairs in different higher order spatial modes aregenerated. Such photons, thus, have multiple degrees of freedom, likepolarization and spatial modes, which can be further harnessed towardshyper-entangled photons for quantum information applications.

Joint spectral amplitude analysis of SPDC photon pairs in a multimode ppLN ridge waveguide