Abstract
We discuss mode conversion and splitting in multimode waveguides based on Lewis–Riesenfeld
invariant theory. The design of mode converters/splitters using the dynamical invariant is discussed. Closed form
expressions for the modal power at the output for converter/splitter design are derived. Various design approaches are
discussed and assessed by beam propagation simulations. We show that the invariant-based engineering scheme reduces
device length as compared to the common adiabatic scheme.
© 2013 IEEE
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