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Schematic drawing of the experimental setup.
Comparison of rf spectra with and without feedback.
rf linewidth as a function of external feedback ratio at a bias of 280 mA gain current and −1 V on the absorber. Inset: rf linewidth of 350 Hz under a feedback ratio of −36 dB.
A log-log plot of the integrated rms timing jitter as a function of the rf linewidth under a bias condition of −0.5 V reverse voltage and various gain currents in the free-running case. The slope of the solid line follows a square-root dependence. Inset: SSB-PN spectral density of the fourth harmonic under 300 mA gain current and −0.5 V reverse voltage.
Center frequency shift and rf linewidth variation under feedback ratio of −30 dB as a function of optical delay line change, showing a periodicity of roughly 1.5 mm corresponding to the laser round trip time of 200 ps. Bias condition of MLL: 280 mA gain current and −1 V reverse voltage.
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