Gain-Switched Semiconductor Pulsed Laser for Quantum Secure Communication

Qiang, 周强 Zhou; Jinlu, 刘金璐 Liu; Yuanhui, 谷远辉 Gu; Fan, 樊矾 Fan; Yunxiang, 王云祥 Wang; Bingjie, 徐兵杰 Xu

doi:10.3788/cjl201643.0502005

Cited by 2 publications

(1 citation statement)

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“…Compared with other pulse generation methods, this idea has an advantage that a simple driving circuit can be used to generate an ultra-short optical pulse, and the output pulse width is much smaller than the modulation current pulse. Theoretical analysis indicates that the photon lifetime of a typical semiconductor laser is 2~3 picosecond, so a ten picosecond laser pulse can be produced theoretically by using a hundred picosecond current pulse in the process of gain switching [12,13].…”

Section: Introductionmentioning

confidence: 99%

Step-Pulse Modulation of Gain-Switched Semiconductor Pulsed Laser

Sun

Liao

et al. 2019

Applied Sciences

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To improve the peak power and extinction ratio and produce ultra-short pulses, a novel approach is presented in this paper offers a highly effective modulated method for a gain-switched semiconductor laser by using step-pulse signal modulation. For the purpose of single pulse output, then the effects on the output from the gain-switched semiconductor laser are studied by simulating single mode rate equation when changing the amplitude and width of the modulated signal. The results show that the proposed method can effectively accelerate the accumulation speed of the population inversion and we can acquire the output pulse with higher peak power and shorter width. Compared with the traditional rectangular wave modulation, this method is advantageous to obtain a high gain switching effect by increasing the second modulation current and reduce the pulse width to saturation at the best working point. It can be incorporated as a practical and cost-effective approach for many fields which need high extinction ratio short pulse, such as the optical time domain reflectometry.

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Section: Introductionmentioning

confidence: 99%