Abstract
Nowadays fiber biphoton sources are nearly as popular as crystal-based ones. They offer a single spatial mode and easy integrability into optical networks. However, fiber sources lack the broad tunability of crystals, which do not require a tunable pump. Here, we report a broadly tunable biphoton source based on a suspended core fiber. This is achieved by introducing pressurized gas into the fibers hollow channels, changing the step index. The mechanism circumvents the need for a tunable pump laser, making this a broadly tunable fiber biphoton source with a convenient tuning mechanism, comparable to crystals. We report a continuous shift of 0.30THz/bar of the sidebands, using up to 25bar of argon.
Highlights
Optical fibers are an ideal platform for the generation of entangled photon-pairs via spontaneous fourwave mixing (FWM), due to their long light-matter interaction length
suspended-core fiber (SCF) are a class of index-guiding microstructured fibers, where light is guided in a glass core suspended by three glass nanomembranes
We demonstrate a fiber biphoton source with very high coincidence-to-accidental ratio (CAR) and tunability over at least 4.6 THz (∼30 nm measured at the red detuned wavelength, we estimate this shift can be ∼40 THz if 45 bar of xenon are used as filling gas)
Summary
Optical fibers are an ideal platform for the generation of entangled photon-pairs (biphotons) via spontaneous fourwave mixing (FWM), due to their long light-matter interaction length. We combine the high nonlinearity of a solid core fiber with the convenient tuning scheme offered by gas-filled fibers, to implement a tunable source of entangled photons.
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