Dynamic control action of BPF in OEO to improve the conversion gain

What is it about?

This study introduces the concept of dynamic controlled bandpass filter (BPF) to achieve improved synchronisation capability of a single-loop optoelectronic oscillator (OEO) under the effect of externally applied angle modulated signal. The governing equation for synchronisation ability of an OEO using dynamic control BPF has been derived. Theoretical study and comparison of locking capability enhancement using this dynamic BPF over a conventional static BPF are provided which is properly validated by simulation. Finally, the ability of frequency modulation to amplitude modulation conversion has been compared by measuring the total harmonic distortion values of the reconstructed signals.

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Why is it important?

The center frequency of the dynamic BPF is changed in accordance to the amplitude of the modulating signal amplitude resulting in bringing the operating point in the more linear region of the characteristics curve. The effective modulation index is reduced, the signal handling capacity of the OEO increases.