Free‐Form Optical Fiber with a Square Mode and Top‐Hat Intensity Distribution

Advanced Science - Tập 11 Số 33 - 2024
Rafał Kasztelanic1,2, Hue Thi Nguyen2, Dariusz Pysz2, Hugo Thienpont3, Takashige Omatsu4, Ryszard Buczyński1,2
1Faculty of Physics University of Warsaw Pasteur 5 Warsaw 02–093 Poland
2Lukasiewicz Research Network – Institute of Microelectronics and Photonics Wolczynska 133 Warsaw 01–919 Poland
3Department of Applied Physics and Photonics, Vrije Universiteit Brussel, Brussels Photonics, Pleinlaan 2, Brussel, 1050 Belgium
4Faculty of Engineering Chiba University 1–33 Yayoi‐cho Inage‐ku Chiba‐shi Chiba 263–8522 Japan

Tóm tắt

AbstractThe 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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Advanced Science

Tập 11 Số 33

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