A photonic approach to generating an optoelectronic oscillator (OEO) based on an integrated mutually coupled (IMC) distributed feedback (DFB) laser is reported. Compared with the traditional construction of an OEO, the IMC-DFB has functions of the laser source, intensity modulator, and microwave photonic filters (MPFs), which could simplify the OEO scheme. An optical feedback loop (O-Loop) and an optoelectronic feedback loop (OE-Loop) are used simultaneously in the proposed scheme. The optical loop was used to reduce the optical linewidth of the IMC-DFB to improve the quality of the laser source in the OE loop. The IMC laser consisted of two distributed feedback (DFB) laser sections with a semiconductor optical amplifier (SOA) section in between. The optical linewidth of the IMC-DFB is reduced from 5.86 MHz to 3.94 kHz due to the feedback of the optical loop. By tuning the current of the SOA and DFB sections, tunable microwaves ranging from 24.9 to 46.5 GHz with single-sideband (SSB) phase noise below −110 dBc/Hz at a 10 kHz offset from the carrier were realized.

中文翻译：

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基于集成互耦合分布式反馈激光器的可调谐宽带光电振荡器

报告了一种基于集成互耦合 (IMC) 分布式反馈 (DFB) 激光器生成光电振荡器 (OEO) 的光子方法。与传统的OEO结构相比，IMC-DFB具有激光源、强度调制器和微波光子滤波器（MPF）的功能，可以简化OEO方案。在所提出的方案中同时使用光反馈回路（O-Loop）和光电反馈回路（OE-Loop）。光学环路用于减小 IMC-DFB 的光线宽，以提高 OE 环路中激光源的质量。IMC 激光器由两个分布式反馈 (DFB) 激光器部分组成，中间有一个半导体光放大器 (SOA) 部分。IMC-DFB 的光线宽从 5.86 MHz 减少到 3。94 kHz 由于光回路的反馈。通过调整 SOA 和 DFB 部分的电流，实现了 24.9 至 46.5 GHz 范围内的可调谐微波，在与载波的 10 kHz 偏移处，单边带 (SSB) 相位噪声低于 -110 dBc/Hz。