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12 August 2008Improving the mode profile circularity of microstructured optical fibers by using an Archimedean-like cladding structure
We present a novel microstructured optical fiber (MOF) structure which consists of a 7-missing-holes core surrounded
by a cladding formed by an Archimedean-like lattice of air holes, as opposed to the standard MOF cladding structure
consisting of a triangular lattice. We demonstrate that this new cladding geometry can be achieved through the standard
stack-and-draw MOF fabrication method, the main difference being the fact that the circular capillaries commonly used
in conventional MOF are replaced by hexagonal canes comprising 7 air holes disposed in a centred hexagon (forming
the so-called A7 unit cells). The Archimedean-like lattice MOF (ALMOF) is particularly interesting by the fact that it
features a dodecagonal core, which is a shape much closer to a perfect circle than the hexagonally-shaped core
characteristic of the conventional 7-missing-holes triangular-lattice MOF. As a result, we show that the improved core
circularity of the ALMOF design leads to a significantly more circular fundamental mode profile, which can prove to be
quite interesting for specific applications where the circularity of the mode profile is critical, such as precision laser
micromachining for example.
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Antoine Proulx, Steeve Morency, Claude Paré, "Improving the mode profile circularity of microstructured optical fibers by using an Archimedean-like cladding structure," Proc. SPIE 7099, Photonics North 2008, 70990Q (12 August 2008); https://doi.org/10.1117/12.806737