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. 2014 Feb 10;111(8):2879–2884. doi: 10.1073/pnas.1400184111

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Fig. 4. — Frequency noise spectrum of the lowest-noise high-Q hybrid laser. The measurement is taken at a pump current of at . Spikes at and correspond to current source electronic noise and FM radio noise, respectively. A spectral linewidth of can be calculated for this laser by multiplying the power spectral density (PSD) value near by . Inset includes the full frequency noise spectrum, showing the feedback-suppressed low-frequency end of the spectrum as well as the onset of the MZI roll-off .

Inline graphic — Frequency noise spectrum of the lowest-noise high-Q hybrid laser. The measurement is taken at a pump current of at . Spikes at and correspond to current source electronic noise and FM radio noise, respectively. A spectral linewidth of can be calculated for this laser by multiplying the power spectral density (PSD) value near by . Inset includes the full frequency noise spectrum, showing the feedback-suppressed low-frequency end of the spectrum as well as the onset of the MZI roll-off .