Hollow Core Fibers

The unique structures of hollow core fibers require advanced mode solvers such as those found in FIMMWAVE to accurately simulate the complex geometry and small details typical of NANF and DNANF cross-sections.

Hollow Core Fibers are a promising area of research creating a fiber that more closely delivers on the promise on light speed communication by having light travel at vacuum speeds down its air-filled core rather than through a material where attenuation and dispersion are introduced. Confinement in the core comes from the intricate nested anti-resonant internal microstructure of the fiber.

• Accurate description of curved geometries using Finite Element Method (FEM) mode solver using a conformal adaptive triangular mesh.

FEM solver mesh on HCF: Triangles accuratly describe geometry + smaller mesh elements used for finer details.

• For high accuracy small elements will be used to desicribe thin geometries typical of NANF and DNANF fibers, while for efficiency, large mesh elements are used for more simple bulk regions.
• The ability to create arbitrary cross section geometries and refractive index profiles including an intuitive editor + Python control.

Photon Design’s engineers are happy to share our Python script for placing HCF geometries. With commands described clearly its quick to pick up how to place rings of nested capillaries at a given position, allowing users to focus on their design.

If this is not on your FIMMWAVE install, reach out with the ‘contact’ button (top right) asking for the hollow core fiber script.

Oxford University investigate Anti Resonant structures with FIMMWAVE to demonstrate the effects of introduced defects to the internal microstructures needed for applying hollow core fibers to gas detection.