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首页> 外文会议>2017 Conference on Lasers and Electro-Optics Europe amp; European Quantum Electronics Conference >Modeling three-section master oscillator power amplifiers with a voltage driven traveling wave model
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Modeling three-section master oscillator power amplifiers with a voltage driven traveling wave model

机译：使用电压驱动行波模型为三部分主振荡器功率放大器建模

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Summary form only given. Numerous applications such as free space optical communications, metrology and differential absorption lidar systems require high brightness laser sources with spectral purity. Monolithically integrated Master Oscillator Power Amplifiers (MOPAs) are promising candidates to fulfil these requirements. In particular, a three-section bent mOpA at 1.5 μm was recently proposed as laser source for an integrated path differential absorption lidar system for measurement of atmospheric CO2 [1]. The device consists of a distributed feedback (DFB) section acting as master oscillator, a bent modulator (MOD) section and a tapered semiconductor optical amplifier (SOA) section with a tilted front facet to avoid coupled cavity effects [2]. Three separate electrical contacts on the laser chip provide access to the three sections: the DFB current controls the laser emission frequency, the MOD current allows for modulation and the SOA current drives the amplification. The MOD section acts as an absorber or amplifier when driven at zero or positive voltage bias respectively. Complete output extinction requires negative values of the MOD current due to carrier generation caused by the power injected from the DFB into the MOD section [1].Here, we theoretically investigate the observed characteristics of a three-section MOPA both in CW and under modulation operation by means of a Traveling Wave Model (TWM) [3] that naturally includes spatial effects (such as spatial hole burning and coupled-cavity effects) and multimode dynamics. The multi-section TWM [4] has been modified in order to reproduce the electrical behaviour of the MOPA. Specifically, we consider the voltage applied to each section as an input parameter, and then the local current density depends on space through the local carrier density, and it can be positive when the modulator is acting as an amplifier or negative when the modulator is absorbing the light injected by the DFB section.
机译：仅提供摘要表格。自由空间光通信，计量学和差分吸收激光雷达系统等许多应用都需要具有光谱纯度的高亮度激光源。单片集成的主振荡器功率放大器（MOPA）有望满足这些要求。特别是，最近提出了一种三节弯曲的mOpA（1.5μm）作为用于测量大气CO 2 的集成路径差分吸收激光雷达系统的激光源[1]。该器件由充当主振荡器的分布式反馈（DFB）部分，弯曲调制器（MOD）部分和带有倾斜小端面的锥形半导体光放大器（SOA）部分组成，以避免耦合腔效应[2]。激光芯片上的三个单独的电触点可访问三个部分：DFB电流控制激光发射频率，MOD电流允许调制，而SOA电流则驱动放大。分别在零或正偏压下驱动时，MOD部分充当吸收器或放大器。由于DFB向MOD部分注入的功率会导致载波产生，因此要完全消除输出，就需要MOD电流为负值[1]。在这里，我们从理论上研究了在CW和调制情况下三部分MOPA的观测特性。通过行波模型（TWM）[3]进行的自然操作包括空间效应（例如空间空穴燃烧和耦合腔效应）和多模动力学。修改了多节TWM [4]，以重现MOPA的电气行为。具体来说，我们将施加到每个部分的电压作为输入参数，然后局部电流密度取决于通过局部载流子密度的空间，当调制器充当放大器时，它可以为正；当调制器充当吸收器时，它可以为负。 DFB部分注入的光。

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