Fig. 4: Low-noise microwave generation using a large-scale photonic chip scale interleaver.
From: Large-scale photonic chip based pulse interleaver for low-noise microwave generation
a The power of generated 13.9 GHz microwave as function of the average optical power after interleaving, which is shown together with the power of the 216 MHz fundamental radio frequency signal and the harmonic 13.9 GHz microwave generated by the pulse train without interleaving. This shows the saturation of the photodiode by the original pulse train and the higher power from the interleaved pulse train. b Phase noise of the generated 13.9 GHz microwave from the non-interleaved pulses, the interleaved pulses and the interleaved pulses amplified by an EDFA. The total shot and thermal noise floors are shown as dashed lines.
