  Harnessing nonlinear optical effects in a photonic chip scale has been proven
useful for a number of key applications in optical communications. Microwave
photonics can also benefit from the adoption of such a technology, creating a
new concept of nonlinear integrated microwave photonics. Here, we discuss the
potential of on-chip nonlinear processing towards the creation of robust and
multifunctional microwave photonic (MWP) processors. We also highlight key
recent results in the field, including frequency agile MWP filters and
ultra-wideband signal generators.
