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(a) The heterostructure of the QD comb laser with band diagram of one period of tunnel injection QD active region and (b) electroluminescence spectrum at 300 K. The inset shows pulsed and cw light-current data at room temperature with threshold current density and and differential efficiency and 40%, respectively.
(a) Temperature dependence of and , from which and were derived to be 110 and 300 K; (b) ground-state modal gain vs current density of comb laser from which a saturation modal gain of per QD layer and a transparency current density are derived.
(a) Electroluminescence spectra at 300 K in the wavelength range of 1283–1288 nm for two cavity lengths: 1040 and . The respective channel spacings are and 0.1 nm; (b) the inset shows electroluminescence spectra at 300 and 323 K with unchanged 0.2 nm peak wavelength spacing.
Small-signal modulation bandwidth of a QD comb laser with at different injection current levels. A maximum modulation bandwidth of 7.5 GHz is measured.
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