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Updated: Jul 4, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Effects of gain and bandwidth on the multimode behavior of optoelectronic microwave oscillators
Y Kouomou Chembo1, Laurent Larger, Ryad Bendoula
1Département d'Optique, Institut FEMTO-ST, 16 Route de Gray, 25030 Besançon cedex, France. yanne.chembo@femto-st.fr
Abstract:
We show that when subjected to high gain, delay-line optoelectronic oscillators can display a strongly multimode behavior depending on the feedback bandwidth. We found that this dynamical regime may arise when the bandwidth of the feedback loop spans over several hundreds of ring cavity-modes, and also when the oscillator is switched on abruptly. Such a persistent multimode regime is detrimental to the performances of this system which is normally intended to provide ultra-pure and single-mode microwaves. We experimentally evidence this multimode dynamics and we propose a theory to explain this undesirable feature.
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