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Frontiers in Optics

Near-infrared photon-pair generation by intermodal four-wave mixing in a few-mode fiber

Erik Nicolai Christensen, Søren M. M. Friis, Jacob G. Koefoed, Mario A. Usuga Castaneda, Karsten K. Rottwitt

Published Jan 1, 2017• 1 citation
Publisher

Abstract

We demonstrate a photon-pair source based on intermodal four-wave mixing in a few-mode fiber generating photons at 965 nm and 1187 nm in the LP01 and LP02 modes, respectively, with a coincidence-to-accidental ratio of 12.
DOI
10.1364/fio.2017.jw4a.6

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Four-wave mixing in optical fibers has been proven to have many applications within processing of classical optical signals. In addition, recent developments in multimode fibers have made it possible to achieve the necessary phase-matching for efficient four-wave mixing over a very wide bandwidth. Thus, the combination of multimode fiber optics and four-wave mixing is very attractive for various applications. This is especially the case for applications in quantum communication, for example in photon-pair generation. This is the subject of this work, where we discuss the impact of fluctuations in core radius on the quality of the heralded single-photon states and demonstrate experimental results of intermodal spontaneous four-wave mixing for photon-pair generation.
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We present a photon-pair source in commercially available optical fiber that produces paired photons at telecommunication and near-infrared (NIR) wavelengths. The highly nondegenerate pairs are 700 nm apart: one in the 1500 nm E- and S-band telecommunication range and the other in the 830 nm NIR range. The high non-degeneracy means the photon pairs are far-detuned from Raman noise, resulting in a high coincidence-to-accidental ratio even while operating at room temperature. The source produces two spectrally and spatially distinct phase-matched processes with low spectral cross-talk, distinct transverse spatial modes in the NIR, and a single fundamental spatial mode in the telecommunication range. The source's room-temperature operation, off-the-shelf materials, and multiplexing potential make it promising for deployment in quantum networks.