This manuscript tackles the issue of circuit parasitics of reflective semiconductor optical amplifiers (RSOAs), which has been often identified as the main culprit for their relatively poor modulation performance. Building upon the findings related to the beneficial effect of inductive peaking (IP) in the case of small-signals and following the principle of photonic-electronic co-design, in this paper we extend our study and reveal that the same effect can be beneficial for large-signal modulation as well. By using multi-Gaussian probability distribution for analyzing the histograms of the sampled signal at the RSOA's output, we explore the evolution of the back-to-back Q-factor under various operating conditions and benchmark the large-signal modulation performance of the IP enhanced RSOA against the one with parasitics excluded. The study confirms that the IP effect indeed provides enhancement of the Q-factor especially in the case of low input optical powers and low to moderate current densities of bits 0 and 1. We reveal that, provided that the modulation depth is kept fixed, Q-factor can be maximized by finding the optimum current corresponding to bit 0. The major and overall achievement of the IP implementation is the boost of the Q-factor through simple modulation current engineering, breaking the limit for post-processing free high quality transmission (Q ≥ 7) for a broad range of bit-rates and seeding optical powers.

中文翻译：

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利用感应峰值增强 RSOA 的大信号调制性能


本手稿解决了反射式半导体光放大器（RSOA）的电路寄生问题，该问题通常被认为是其调制性能相对较差的主要原因。基于与小信号情况下感应峰化 (IP) 的有益效果相关的发现，并遵循光子电子协同设计的原则，在本文中，我们扩展了我们的研究，并揭示了相同的效果可能是有益的也适用于大信号调制。通过使用多高斯概率分布分析 RSOA 输出端采样信号的直方图，我们探索了各种操作条件下背靠背 Q 因子的演变，并对 IP 增强型的大信号调制性能进行了基准测试。 RSOA 反对排除寄生现象的一种。研究证实，IP 效应确实增强了 Q 因子，尤其是在低输入光功率以及位 0 和 1 的低至中等电流密度的情况下。我们发现，如果调制深度保持固定，Q 值通过找到与位 0 相对应的最佳电流，可以最大化 Q 因子。IP 实现的主要和总体成就是通过简单的调制电流工程提高 Q 因子，突破了免后处理高质量传输的限制（ Q ≥ 7) 适用于广泛的比特率和播种光功率。