We present simulations for coupling between a single mode waveguide and modes of a multimode waveguide. The phase matching curve has turning points where a sudden transition occurs between a double resonance and no resonance.

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Conference Frontiers in Optics, FiO 2005
Andreyuk, A., Steele, A, & Albert, J. (2005). Modal dispersion properties of LPG-assisted coupling between single-mode and multimode channel waveguides. Presented at the Frontiers in Optics, FiO 2005.