Abstract
At z = 0 a power distribution may be excited by a Gaussian TEM00 beam in a parabolic-index fibre in which each group of modes with a given propagation constant carries the same power as prescribed by Olshansky's steady-state distribution. This power distribution, however, still depends on both mode numbers ν, μ. Such an excitation may be advantageous for measuring losses in fibres and coupling elements.
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