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Updated: Aug 6, 2026

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
Published on: July 29, 2013
Free-Form Optical Fiber with a Square Mode and Top-Hat Intensity Distribution
Rafal Kasztelanic1,2, Hue Thi Nguyen2, Dariusz Pysz2
1Faculty of Physics, University of Warsaw, Pasteur 5, Warsaw, 02-093, Poland.
Abstract:
The development of bend-induced effectively single-mode fiber with a square cross-section and flat top-hat intensity distribution is reported using core topology nanostructuring dedicated to femtosecond laser ablation systems. The fiber's core comprises 5419 silica and germanium-doped silica nanorods with a diameter of 430 nm each arranged into a hexagonal lattice. The distribution of the rods is calculated using in-house developed code based on the Monte Carlo algorithm to obtain a target shape of mode and intensity distribution. As a proof-of-concept, a silica nanostructured fiber with a 24 µm core is developed and verified against the purity of mode guidance, bending, and guiding losses. It is shown that for a wavelength of 1030 nm, the fiber is effectively single-mode with 96% mode purity when bending with a radius of 20 cm is applied. The fiber has a measured mode area of 360 µm2, numerical aperture of 0.03, and total losses of 0.07 dB m-1.
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