The dependence of lasing properties on the donor concentration is experimentally investigated for 1.3 µm n-type modulation-doped (MD) strained multiquantum well (MQW) lasers. The threshold current density has a minimum at a donor concentration of 3 × 1018 cm-3; the carrier lifetime and the optical gain coefficient decrease with the donor concentration. The turn-on delay time of 100 ps can be expected at 85°C when the MD-MQW structure is applied to a low-leakage buried heterostructure laser.
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