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. 2015 Nov 18;5:16848. doi: 10.1038/srep16848

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Amplitude functions R₁ (a) and R₂ (b) versus wavelength. Phase responses ϕ₁ (c) and ϕ₂ (d) versus wavelength. (e) Losses (blue line) and allowed modes (red line) after evaluation of Eq. 2 and Eq. 3. The gain shape (black line) is also shown. Three modes at 597.3 nm, 598.8 nm and 604.3 nm are highlighted with symbols: triangles, stars and full square, respectively.