Abstract
The assumption of zero differential loss between coupling modes in a multimode transmission line reduces the complexity of theoretical analysis. Here we show that in general the approximate solution including differential loss between modes may be computed by convolving the solution for the case of zero differential loss with the Fourier transform of exp (− | Δαu|). The rapidity of loss variation versus frequency is limited to (2Δα/Δβ)f for transmission lines with high Δα
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