Dual-frequency optoelectronic oscillator based on reconfigurable microwave photonic filters

Dual-frequency optoelectronic oscillators have potential applications in dual-frequency wireless networks, laser radar, and communication systems. This article proposes a dual-frequency optoelectronic oscillator based on a reconfigurable microwave photonic filter. Two microwave signals of different frequencies oscillate simultaneously in the cavity of the photonic oscillator. By adjusting the spectral cutting used to achieve the microwave photonic filter, sinusoidal sampling signals of different spectral ranges can be obtained. The sinusoidal sampling signals are weighted and delayed by a linear time invariant system of dispersion compensation fibers to generate a dual-frequency microwave photonic filter. Based on the microwave photonic filter, dual-frequency microwave signals can be simultaneously output, as well as switching between single and dual-frequencies and tuning different frequencies of a single frequency. The results indicate that the output signal of the optoelectronic oscillator can achieve stable tuning at 370 MHz, 763 MHz, 1 GHz, and 1.36 GHz, and achieve dual-band switching output at 370 MHz and 763 MHz.