Carrier transport effects on pulse statistics of modulated quantum well lasers

Luis Pesquera; Nasreldin Mustafa; Ignacio Esquivias

doi:10.1117/12.275599

6 June 1997 Carrier transport effects on pulse statistics of modulated quantum well lasers

Luis Pesquera, Nasreldin Mustafa, Ignacio Esquivias

Proceedings Volume 2994, Physics and Simulation of Optoelectronic Devices V; (1997) https://doi.org/10.1117/12.275599
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

We perform a theoretical study of carrier transport effects on the pulse statistics of QW lasers modulated at GHz rates for different bias levels, I_b, and modulation frequencies. The lasers considered are ultra-high speed In_0.35Ga_0.65As/GaAs MQW lasers with intrinsic modulation bandwidths of 40GHz. A rate-equation model, including spontaneous emission noise, which incorporates the dynamics of the unconfined carriers in the core is used. Different values of the transport/capture time, (tau) _cap, and the re-emission time out of the QW's (escape time) (tau) _esc, are considered to illustrate carrier transport effects. Different bias currents near threshold are considered. In this way small enough turn-on delay times and good on-off ratio are obtained.It is found that for slow modulation the laser switch-on is delayed and the timing jitter is increased when (tau) _cap increases and (tau) _esc decreases. These detrimental effects are reduced at high rates. However, the maximum modulation frequency decreases when (tau) _cap increases. Concerning the combined dependence of turn-on time of I_b and on the modulation frequency, the results are similar to those obtained for bulk lasers when (tau) _cap is not very large, even for small (tau) _esc. Timing jitter becomes rather independent of the modulation frequency at GHz rates when biasing slightly below threshold. However, for large (tau) _cap timing jitter increases with the modulation period. The dependence on the modulation frequency is due to the initial condition at the beginning of a pulse, that is very different from the steady state associated to I_b.

Citation Download Citation

Luis Pesquera, Nasreldin Mustafa, and Ignacio Esquivias "Carrier transport effects on pulse statistics of modulated quantum well lasers", Proc. SPIE 2994, Physics and Simulation of Optoelectronic Devices V, (6 June 1997); https://doi.org/10.1117/12.275599

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