A tapered optical fiber is used e.g. to lead a collimated beam with a relatively large diameter into a smaller fiber or to get a better energy density in the immediate vicinity of the fiber output.
CeramOptec® provides fused end tapered optical fibers of highest quality. All taper assemblies are available with standard connectors or custom-designed ferrules.
Fig.1: Simplified profile of a fused-end taper
The tapered part is very short (approx. between 5mm and 100mm)
In a fused-end taper the “real” taper is very short and can completely be built in a SMA connector. The thin end of this taper is spliced to a standard fiber. Fused-end tapers are more cost effective compared to continuous tapers and can be built with a customized ratio of input diameter to output diameter.
e.g.: Core A: 200µm, Core B: 100µm, Fiber type: WFGe.
A tapered optical fiber modifies the geometry of an input beam by reducing its diameter and enlarging its output angle.
In other words: A tapered optical fiber acts as a numerical aperture (and beam diameter) converter by converting the input beam NA by the following formula:
NAo = R x NAi
Where: NAo = Output NA (pigtail NA)
NAi = Input NA
R = Ratio of taper input diameter to output diameter
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