Figure 4 | Scientific Reports

Figure 4

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

Figure 4

SSB phase noise measurement results (with a measurement bandwidth of 500 kHz).

(a), (i) and (ii) Absolute phase noise of the free-running and locked OEO, respectively. (iii) Absolute phase noise of a commercial VCO. (iii) Out-of-loop residual phase noise of the OEO locked to the OFC (integrated rms timing jitter approximately 2.2 fs [1 Hz–100 kHz]). (iv) Background noise of the optical phase detector when the microwave signal is not applied. (b), The absolute phase noise of the locked OEO at eleven discrete carrier frequencies.

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