Figure 2 | Scientific Reports

Figure 2

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

Figure 2

Experimental setup of the synchronisation and measurement system.

EOM: electro-optic modulator; DDF: dispersion-decreasing fibre; PD: photodetector, LN AMP: low-noise amplifier; BPF: bandpass filter; LPF: low-pass filter; RF: radio frequency; EC: electronic coupler; PS: power splitter; PID: proportion integration differentiation. Two optical phase detectors are used in our synchronisation system. One detector is used to detect the phase difference between the OEO and the pulse trains to generate the in-loop phase error. This error signal is low-pass filtered, amplified, PID-regulated and then fed back to the EOM to lock the OEO to the pulse train. The other optical phase detector is used to generate the out-of-loop phase error for measurements of the out-of-loop residual phase noise, phase drift and relative frequency instability.

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