Program FIBER

Program Fiber calculates the mode indices, and electric and magnetic fields for a cylindrical core with multiple concentric shells. Input and output is via text on screen, files on disk, and presentation quality graphics. Overlap integrals with a Gaussian focused field, an Airy focused field, or a full vectorial focused field from Program Focus can be calculated to estimate coupling efficiencies. A far field calculation is included to estimate the far field output from the waveguide. Materials are characterized by their refractive index. There are many available wavelength-dependent material files and the user can easily add more. The focusing algorithm is described in more detail in Fundamental Optical Models which can be purchased at Amazon, Barnes & Noble, or Routledge.

Modeling Examples:*

Simple multimode waveguide. Dispersion as a function of radius and wavevector, and Ex field profiles.

W-fiber designed with 1 concentric shell [after M. Monerie, IEEE J. Qu. Electr. QE-18 (1982) 535-42] with very low dispersion at 1.55 microns.

Graded index fiber using 9 concentric cylinders. HE11 mode index as a function of g. Ex field profile for g=2.

Airy fiber designed with 33 concentric shells [after I. Gris-Sanchez, et al., optica 3 (2016) 270-6] with a coupling efficiency into the LP04 mode of ~97%.

Far field spot for SMF-28 single mode fiber with normal end face and 8° slanted end face.

*Note: all plots are generated using commercial graphics software from the text data output of the program though presentation quality graphics on the screen are also generated by the program.