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We present a scheme for spatial-mode-selective frequency conversion in a few-mode fiber and experimentally demonstrate upconversion of either of two signal modes from C-band to fundamental mode in S-band with crosstalk below -15.5 dB.

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We describe a novel scheme for spatial-mode-entangled photon-pair generation in a few-mode fiber. We experimentally verify the underlying inter-modal parametric processes with two-mode classical signal input and demonstrate high mode purity of the generated idler.