Impacts of carrier capture and relaxation rates on the modulation response of injection-locked quantum dot lasers
Résumé
Taking into account the carrier dynamics in the wetting layer, excited state and the ground state, the intensity modulation properties of an injection-locked quantum dot laser are studied theoretically through a semi-analytical approach. It is demonstrated that both high carrier capture and relaxation rates enhance the modulation bandwidth as well as the resonance-peak amplitude. Moreover, the pre-resonance dip arising under positive detuning can be eliminated as well, which is beneficial for further bandwidth enhancement. It is also found that a large capture time reduces both the resonance frequency and the damping factor while both are increased by a large relaxation time.