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首页> 外文期刊>IEEE journal of selected topics in quantum electronics >Dynamics of gain-switching operation in gain-coupled distributed-feedback semiconductor lasers with absorptive grating
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Dynamics of gain-switching operation in gain-coupled distributed-feedback semiconductor lasers with absorptive grating

机译：具有吸收光栅的增益耦合分布反馈半导体激光器中增益切换操作的动力学

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摘要

Very-low-chirping optical short-pulse generation in gain-coupled (GC) distributed-feedback (DFB) semiconductor lasers of absorptive-grating type is investigated. First, we have observed time-resolved spectra of gain-switched optical pulses. The GC DFB laser has shown a very small and characteristic lasing wavelength shift with time. Moreover, we have noticed uncommon bias-dependence of the pulse width and pulse tailing at high bias regime. Then, we have examined spontaneous emission from the grating to probe carrier generation by the optical pulse. Next, we have conducted a rate equation analysis to understand the uncommon pulse dynamics of the GC DFB laser by taking the carrier generation in the grating into account, consequently, all the anomalies observed in the GC DFB laser have successfully been explained. Finally, by making use of the analysis, we have shown a guideline to further improve the pulse shape without sacrificing the low chirping property.
机译：研究了吸收光栅型增益耦合（GC）分布式反馈（DFB）半导体激光器中的低-线性光学短脉冲产生。首先，我们观察了增益切换光脉冲的时间分辨光谱。 GC DFB激光器的激光波长随时间变化非常小且具有特征性。此外，我们注意到在高偏置状态下，脉冲宽度和脉冲拖尾的偏置依存性很差。然后，我们检查了从光栅到光脉冲产生的探针载流子的自发发射。接下来，我们进行了速率方程分析，通过考虑光栅中载流子的产生来理解GC DFB激光器的不常见脉冲动力学，因此，成功地解释了在GC DFB激光器中观察到的所有异常情况。最后，通过分析，我们显示了在不牺牲低线性调频特性的情况下进一步改善脉冲形状的指南。

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