Peter T. S. DeVore, David Borlaug and Bahram Jalali
Modulation instability is a universal nonlinear process wherein a weak perturbation grows on an otherwise quiet background. Inspired by recent work on stimulating modulation instability to tame optical rogues waves, DeVore, Borlaug, and Jalali (see their Letter on pp. 566–570) stimulate it with the weak sidebands of an electrooptically modulated carrier. In this process, the sidebands are boosted at the expense of the carrier, which enables low-voltage, high bandwidth modulation, the most pressing need in optical communications. In the cover figure, we see that a traditional optical link weakly transfers high-frequency radio frequency waves, but the fortuitous increase of modulation instability gain with frequency allows transfer of the full bandwidth.