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Control of laser radiation parameters
Improved dynamics of a tunnelling-injection quantum-dot laser under optical feedback
Faezeh Asadi, Abbas Zarifkar Department of Communications and Electronics, School of Electrical and Computer Engineering, Shiraz University, Iran
Abstract:
We report an investigation of the optical feedback effect on the dynamics of a tunnelling-injection quantum dot (TI QD) semiconductor laser. Assuming the external cavity to be short and using a small signal analysis, the modulation response of a TI QD laser is calculated under optical feedback conditions. The impact of the tunnelling probability, bias-current density, feedback ratio, external cavity length and linewidth enhancement factor on the modulation response of a TI laser is studied. With the optical feedback taken into account, the modulation responses of conventional and TI QD lasers are compared. The obtained results demonstrate that at an appropriate feedback ratio and external cavity length, the laser bandwidth and its relaxation frequency can be improved.
Keywords:
modulation response, quantum dot laser, tunnelling injection.
Received: 12.07.2016 Revised: 31.08.2016
Citation:
Faezeh Asadi, Abbas Zarifkar, “Improved dynamics of a tunnelling-injection quantum-dot laser under optical feedback”, Kvantovaya Elektronika, 46:10 (2016), 883–887 [Quantum Electron., 46:10 (2016), 883–887]
Linking options:
https://www.mathnet.ru/eng/qe16483 https://www.mathnet.ru/eng/qe/v46/i10/p883
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