Abstract

We carried out modeling and simulation of the noise properties associated with types of modal oscillations induced by scaling the asymmetric gain suppression (AGS) in multimode semiconductor lasers. The study is based on numerical integration of a system of rate equations of 21-oscillating modes taking into account the self- and cross-modal gain suppression mechanisms. AGS is varied in terms of a predefined parameter, which is controlled by the linewidth enhancement factor and differential gain. Basing on intensive simulation of the mode dynamics, we present a mapping (AGS versus current) diagram of the possible types of modal oscillations. When the laser oscillation is hopping multimode oscillation (HMMO), the spectra of relative intensity noise (RIN) of the total output, and hopping modes are characterized by a sharp peak around the relaxation oscillation frequency and a broad peak around the hopping frequency. The levels of RIN in the regimes of single-mode oscillation are much lower than those under HMMO, and the mode-partition noise is two orders of magnitudes lower.

中文翻译：

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非对称增益抑制对多模半导体激光器相对强度噪声特性的影响

摘要

我们对与通过缩放多模半导体激光器中的不对称增益抑制（AGS）引起的模态振荡类型相关的噪声特性进行了建模和仿真。该研究基于21种振荡模式速率方程系统的数值积分，其中考虑了自模式和交叉模式增益抑制机制。AGS根据预定义参数而变化，该预定义参数由线宽增强因子和差分增益控制。在对模式动力学进行深入模拟的基础上，我们给出了模态振荡的可能类型的映射图（AGS与电流）。当激光振荡为跳频多模振荡（HMMO）时，总输出的相对强度噪声（RIN）的光谱 跳跃模式的特征是在弛豫振荡频率附近有一个尖峰，在跳跃频率附近有一个宽峰。在单模振荡状态下，RIN的水平远低于HMMO模式下的RIN，并且模式分配噪声要低两个数量级。