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Four-wave mixing (FWM) in optical fibre is a leading technique for generating high-quality photon pairs. We report the generation of photon pairs by spontaneous FWM in photonic crystal fibre pumped by a 1.5 GHz repetition-rate vertical-external-cavity surface-emitting laser (VECSEL). The photon pairs exhibit high count rates and a coincidence-to-accidental ratio of over 80. The VECSEL's high repetition-rate, high average power, tunability, and small footprint make this an attractive source for quantum key distribution and photonic quantum-state engineering.
Morris, O. J., Francis-Jones, R. J. A., Wilcox, K. G., Tropper, A. C., & Mosley, P. J. (2014). Photon-pair generation in photonic crystal fibre with a 1.5 GHz modelocked VECSEL. Optics Communications, 327, 39-44. https://doi.org/10.1016/j.optcom.2014.02.003