In situ fabrication of far-detuned optical fiber wavelength converters.

We demonstrate an in situ approach for the fabrication of all-fiber wavelength converters with a wavelength offset that is both far-detuned and precisely engineered. Such wavelength converters are fabricated using the parametric gain of A2Se3 microwires and finely tuned from successive adjustments of microwire diameter along with real-time monitoring. Wavelength conversion is achieved from a pump at a wavelength of 1.938 μm to any far-detuned idler within the spectral range of 2.347-2.481 μm, resulting in a detuning of 27.0-33.9 THz with a wavelength offset precision within 3.1 THz.