Abstract
We use a nonlinear analytic approach to predict the main oscillation mode power and spurious levels in
ultrapure microwave optoelectronic oscillators (OEOs). This approach takes into account N simultaneously mode falling
inside the RF filter bandwidth and calculates all the dominant InterModulation Products (IMPs) that fall in the
fundamental zone. We show that nonlinear microwave photonic links exhibit the capture effect. By considering this
effect, we derive analytical expressions that govern the behavior of the OEOs in the steady state. We find that when
the small-signal open-loop gain is increased beyond a critical value, OEOs start a multimode operation from which the
spurious levels grow rapidly. Our analytical predictions are verified by numerical simulations and experimental data.
© 2013 IEEE
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