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1887

Spot size, adiabaticity and diffraction in tapered fibres

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Abstract

A simple formula is given for the maximum spot size achievable by downtapering a single-mode fibre, regardless of core profile. When the fundamental-mode field is approximately Gaussian, the maximum taper angle associated with minimal loss of spot-size power on a finite-length taper is the classical diffraction angle for a beam passing through a circular aperture.

References

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