The authors present the complete characterization of two cost-efficient photonically integrated slotted lasers that offer regrowth free manufacturing. Furthermore, the application of these devices, as multi-carrier transmitters is also investigated. In particular, the authors employ gain switching, an optical frequency comb (OFC) generation technique based on the direct modulation. The first device used is a dual section discrete mode index patterned device. It comprises two sections, implemented in a master–slave configuration to achieve optical injection locking (OIL) of the slave section. The second, a four-section device, consists of two regrowth-free Fabry-Perot lasers, also forming a master–slave configuration. The authors demonstrate that the additional sections give finer control over the OIL parameters of the device. Results show that the OIL leads to the enhancement of the modulation bandwidth, which in turn can be used to generate a broader OFC. The generated OFC is characterized to demonstrate additional improvements brought by OIL such as reduced optical linewidth and relative intensity noise. The lower fabrication cost of such photonically integrated slotted lasers, accompanied by their applicability to OFC generation make them attractive potential candidates for the employment in next generation short reach optical networks.

中文翻译：

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用于光频梳生成的光子集成增益开关激光器

作者展示了两种具有成本效益的光子集成开槽激光器的完整表征，这些激光器提供无再生制造。此外，还研究了这些设备作为多载波发射机的应用。特别是，作者采用了增益切换，这是一种基于直接调制的光频梳 (OFC) 生成技术。使用的第一个设备是双段离散模式指数图案化设备。它包括两个部分，在主从配置中实现，以实现从属部分的光注入锁定 (OIL)。第二个是四节装置，由两个无再生法布里-珀罗激光器组成，也形成了主从配置。作者证明，附加部分可以更好地控制设备的 OIL 参数。结果表明，OIL 导致调制带宽的增强，进而可用于生成更广泛的 OFC。生成的 OFC 的特征在于证明了 OIL 带来的额外改进，例如减少的光线宽和相对强度噪声。这种光子集成开槽激光器的制造成本较低，加上它们对 OFC 的适用性，使它们成为下一代短距离光网络的有吸引力的潜在候选者。