Controlling the transmission bandwidth of anti-resonant hollow-core fibers

We have developed an innovative anti-resonant hollow-core fiber design with capillaries of alternating thicknesses. This unique arrangement, featuring six silica capillaries of two different thicknesses, effectively narrows the transmission bandwidth while maintaining low attenuation. Validated through simulations, our design marks a significant step in developing the first in-line hollow-core bandwidth filter fiber. We envision that our novel fiber design has a variety of applications, such as suppressing non-linear effects and developing wavelength-selective components for future conventional and quantum communication networks.