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.
@article{arxiv.2602.15207,
title = {Near-Infrared and Telecommunication-Wavelength Photon-Pair Source in Optical Fiber},
author = {Keshav Kapoor and Dong Beom Kim and Kriti Shetty and Virginia O. Lorenz},
journal= {arXiv preprint arXiv:2602.15207},
year = {2026}
}