This work theoretically investigates the four-level pulse-amplitude modulation characteristics of quantum dot lasers subject to optical injection. The rate equation model takes into account carrier dynamics in the carrier reservoir, in the excited state, and in the ground state, as well as photon dynamics and phase dynamics of the electric field. It is found that the optical injection significantly improves the eye diagram quality through suppressing the relaxation oscillation, while the extinction ratio is reduced as well. In addition, both the adiabatic chirp and the transient chirp of the signal are substantially suppressed.
Yue-Guang Zhou and Cheng Wang, "Pulse-amplitude modulation of optical injection-locked quantum-dot lasers," Proc. SPIE 10526, Physics and Simulation of Optoelectronic Devices XXVI, 1052606 (Presented at SPIE OPTO: January 29, 2018; Published: 23 February 2018); https://doi.org/10.1117/12.2291338.
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