Theory of resonant frequency spectrum of tunable multi-loop spin-wave optoelectronic oscillators

A theoretical model of the tunable multi-loop optoelectronic oscillators based on photonic and microwave spin-wave delay lines was developed. The theory takes into account a dispersion of electromagnetic waves in optical fibers and a dispersion of spin waves in ferrite films. An expression for transfer function of the multi-loop circuitry was derived. Numerical simulations of the resonant frequency spectra were carried out. Theoretical results are in good agreement with experiment.