Intermediate-Mode-Assisted Optical Directional Couplers via Embedded Periodic Structure
نویسندگان
چکیده
The exchange of power between two identical coupled waveguides with embedded periodic structure along the z direction is studied in the framework of Floquet–Bloch theory. A one-period propagator is calculated and a spectrum of its eigenvalues (eigenphases) is studied. We show that due to special symmetry properties of the Floquet–Bloch operator, a strong enhancement or a total suppression of power exchange can be obtained. The power exchange control is realized by the interaction of lowest order waveguide modes with high-order modes. A numerical example is presented in which the beat length is shortened by more than five orders of magnitude.
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