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(a), (b) Real and imaginary parts, respectively, of the scaled propagation constants β(m)/k0 pertaining to the supermodes of order m = 1 (empty markers) and m = 2 (full markers) of the modified compound profile in Eq. (18), as a function of the scaling parameter ξ, for w = 2λ0, D = 1.02 and |Im(Δε1)| = 0.015. (c), (d) Same as above, but for the supermode of order m = 3. (e), (f) Same as above, but for the supermodes of order m = 4 (empty markers) and m = 5 (full markers).
