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Experimental setup for a passive mode-locked external cavity quantum dot (QD) curved two-section (TS) diode laser. DG: Diffractive grating, A: absorber section, G: gain section, L: lens, OI: optical isolator, HWP: haft wave plate, F: fibre, FS: fibre splitter, PD: photo diode, RFSA: RF spectrum analyzer, AUT: autocorrelator, OSC: oscilloscope, OSA: optical spectrum analyzer, PC: personal computer.
Wavelength tuning range in mode-locked regime is presented for different applied gain current and 3 V reverse bias. The highest tuning range of 136.5 nm is achieved for gain current of 1 A.
Wavelength tunability in mode-locked regime from 1182.5 nm to 1319 nm at 3 V reverse bias and 1 A gain current.
(a) Dependence of peak power and (b) pulse duration with the emission wavelength in mode-locked regime for gain current of 900 mA and reverse bias of 3 V, inset: autocorrelation trace for 1226 nm.
(a) Dependence of peak power and (b) pulse duration with different bias conditions for 1226 nm wavelength. The highest peak power of 870 mW was achieved for current of 1 A and reverse bias of 4 V.
(a) A measured autocorrelation trace (black) and Gaussian fitting (red) pulse shape of 26.1 ps resulting in deconvolved pulse duration of 18.4 ps. (b) RF spectrum for highest peak power regime at −4.5 V reverse bias and 1 A gain current for fundamental mode-locking regime of ∼740 MHz.
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