Liekki (Lohja, Finland) has released square and rectangular optical fibers for high-power delivery applications. Square- and rectangular-shaped fibers more closely match optical sources. Different combinations — rectangular core-round cladding or rectangular core-rectangular cladding — are available. The fibers exhibit low photodarkening, flat refractive index profile, and reduced nonlinear effects.

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This article first appeared in the March, 2007 issue of Photonics Tech Briefs Magazine.

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