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Coupling of energy between two propagation modes as a function of the coupling coefficient κ and the difference in propagation constant δ. In the three different cases (δ = 0 and κ = 0, blue lines; δ = 0.04 and κ = 0.02, red lines; δ = 0.04 and κ = 0.1, green lines), the dashed line represents the irradiance of mode a and the full line the irradiance of mode b with an irradiance at origin given by Ia(0) = 1 and Ib(0) = 0.
