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Experimental setup. I: Isolator; OC: output coupler ; QD-ECML: quantum-dot external cavity mode-locked laser; QD-SOA: quantum-dot semiconductor optical amplifier.
(a) Normalized autocorrelation trace with different reverse bias voltage. (b) FWHM of autocorrelation signal vs reverse bias voltage on absorber section at .
Spectrum of passive mode-locked pulses. ; reverse bias . (a) Optical spectrum, (b) rf spectrum.
Autocorrelation signal of the compressed pulses.
The chirp of pulses as a function of (a) driving currents and (b) reverse bias voltages.
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