# Raman tailored photonic-crystal-fiber for telecom band photon-pair generation

## TL;DR

This paper demonstrates a novel liquid-filled hollow-core photonic-crystal fiber optimized for generating telecom band photon pairs with minimal noise, advancing quantum communication technologies.

## Contribution

It introduces an optimization method linking liquid choice and fiber design for efficient photon-pair generation at telecom wavelengths.

## Key findings

- Identified phase matching ranges with no Raman noise contamination.
- Optimized fiber and liquid combination for telecom photon-pair generation.
- Demonstrated potential for high signal-to-noise ratio in fibered photon sources.

## Abstract

We report on the experimental characterization of a novel nonlinear liquid-filled hollow-core photonic-crystal fiber for the generation of photon pairs at telecommunication wavelength through spontaneous four-wave-mixing. We show that the optimization procedure in view of this application links the choice of the nonlinear liquid to the design parameters of the fiber, and we give an example of such an optimization at telecom wavelengths. Combining the modeling of the fiber and classical characterization techniques at these wavelengths, we identify, for the chosen fiber and liquid combination, spontaneous four-wave-mixing phase matching frequency ranges with no Raman scattering noise contamination. This is a first step toward obtaining a telecom band fibered photon-pair source with a high signal-to-noise ratio.