| Summary: | 碩士 === 國立交通大學 === 電子研究所 === 100 === In this thesis, two-section passively mode-locked quantum-dot lasers are
monolithically fabricated by electrically isolation etching between the gain section and
absorber section. As-cleaved cavity lengths of 2 mm and 2.5 mm with gain-to-absorber
ratios of 1:5, 1:6 and 1:8 are prepared for the measurement. The spectral and the temporal
characteristics of mode-locked pulses investigated as a function of forward bias current in
the gain section as well as the reverse bias voltage in the absorber section. To facilitate and
fast the measuring process, we have set up the automatic measurement system to retrieve
the optical spectra, the electrical RF spectra as well as the autocorrelation traces and
analyze them in the systematic mapping. The shortest pulse duration of 2 ps with repetition
rate of 16 GHz is achieved in the study. Moreover, we shorten the cavity length down to 1
mm, and successfully demonstrate the mode-locked pulses with repetition rate as high as
41 GHz and duration as low as 3.4 ps. It is possible to apply this high speed and ultra-short
pulse laser to optical communication and medical imaging.
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