waveguidedispersion
Waveguide dispersion is the wavelength dependence of the propagation characteristics of light in a guided structure due to the geometry and boundary conditions of the waveguide. It arises when the confinement of light within a core with finite dimensions alters the effective optical path and the phase velocity for different wavelengths, even if the material itself is non-dispersive. In optical systems, the group velocity and phase velocity of a guided mode vary with wavelength because the mode’s effective index changes with wavelength as a result of the waveguide’s cross-section, refractive-index contrast, and mode profile.
In practical terms, waveguide dispersion contributes to the total chromatic dispersion observed in a guided system.
Waveguide dispersion can be engineered by adjusting waveguide dimensions and index contrast. In planar, strip, slot,
Note that in multimode waveguides, modal dispersion arises from differences between modes; waveguide dispersion refers to