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We introduce a new type of states for light in multimode waveguides featuringstrongly enhanced or reduced spectral correlations. Based on the experimentallymeasured multi-spectral transmission matrix of a multimode fiber, we generate aset of states that outperform the established "principal modes" in terms of thespectral stability of their output spatial field profiles. Inverting thisconcept also allows us to create states with a minimal spectral correlationwidth, whose output profiles are considerably more sensitive to a frequencychange than typical input wavefronts. The resulting "super-" and"anti-principal" modes are made orthogonal to each other even in the presenceof mode-dependent loss. By decomposing them in the principal mode basis, weshow that the super-principal modes are formed via interference of principalmodes with closeby delay times, whereas the anti-principal modes are asuperposition of principal modes with the most different delay times availablein the fiber. Such novel states are expected to have broad applications infiber communication, imaging, and spectroscopy.

Super- and Anti-Principal Modes in Multi-Mode Waveguides