Effects of the Gain Saturation Factor on the Nonlinear Dynamics of Optically Injected Semiconductor Lasers
Effects of the Gain Saturation Factor on the Nonlinear Dynamics of Optically Injected Semiconductor Lasers
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DOI：
10.1109/jqe.2014.2301998
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发表时间：
2014-01
影响因子：
2.5
通讯作者：
M. Almulla;Jia-Ming Liu
中科院分区：
文献类型：
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作者：
M. Almulla;Jia-Ming Liu
增益饱和因子描述了与激光腔中循环光场相关的光学磁化率的实部和虚部之间的比例。该因素取决于激光器相对于增益峰值的工作位置。研究增益饱和因子对光注入引起的非线性现象特性的影响，以找到适合各种应用要求的最佳工作条件。这些要求包括高微波频率、低相位噪声、宽带频率可调性、高调制带宽、光学单边带调制和稳定性。通过映射其非线性动态特性作为失谐频率和注入强度的函数，对正、负和零增益饱和因子的光注入半导体激光器进行比较。研究发现，较小或较大负增益饱和因子会增强光注入激光的不稳定性。在稳定锁定和周期性振荡中，小于线宽增强因子的正增益饱和因子的激光器最适合光传输要求。
The gain saturation factor describes the proportionality between the real and imaginary parts of the optical susceptibility associated with the circulating optical field in the laser cavity. This factor depends on where the laser operates relative to the gain peak. The effects of the gain saturation factor on the characteristics of the nonlinear phenomena induced by optical injection are studied to find the optimal operating conditions for various application requirements. Such requirements include high microwave frequency, low phase noise, broadband frequency tunability, high modulation bandwidth, optical single-sideband modulation, and stability. Optically injected semiconductor lasers of positive, negative, and zero gain saturation factors are compared through mappings of their nonlinear dynamical characteristics as functions of the detuning frequency and the injection strength. It is found that the instability of an optically injected laser is enhanced by a smaller or more negative gain saturation factor. In both stable locking and periodic oscillations, a laser of a positive gain saturation factor that is smaller than the linewdith enhancement factor is most suitable for optical transmission requirements.