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. 2015 Aug 27;5:13355. doi: 10.1038/srep13355

Figure 4. Single-sideband (SSB) phase noises of the beat notes from different spectral regions of the comb.

Figure 4

Three filtered spectral regions of the comb with the comb lines are shown in the inset (blue curve: 1529 to 1538 nm; red curve: 1555 to 1564 nm). The black curve shows the whole spectrum excluding the pump. All SSB phase noise spectra show a very low phase noise floor of −130 dBc/Hz at 1 MHz offset from the carrier. For offset frequency below 10 kHz, the phase noise has a roll-off of 30 dB/decade (purple dashed line). The olive curve is the SSB phase noise of the local oscillator used for downmixing the 17.986 GHz beat note.