Figure 3 | Scientific Reports

Figure 3

From: Highly Stable Wideband Microwave Extraction by Synchronizing Widely Tunable Optoelectronic Oscillator with Optical Frequency Comb

Figure 3

Spectra of the generated microwaves from the OEO at different harmonic frequencies from 2 to 4 GHz.

By adjusting the centre frequency of the electronic filter group, a widely tunable free-running OEO range of 2 to 4 GHz is achieved with a fine frequency step of 144.5 MHz. The frequencies of the microwaves match the harmonics of the OFC.

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