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Schematic of the unidirectional QD ring laser. QD SOA: quantum-dot semiconductor optical amplifier, I: isolator, AM: amplitude modulator, OC: 20% output coupler, PC: polarization controller, rf: rf driving signal, and M: mirror.
(a) Optical spectrum and (b) mode-locked pulse trains.
(a) rf spectrum and RBW, resolution bandwidth, and (b) supermode noise level vs rf frequency detuning.
Residual phase noise and integrated timing jitter.
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