A tunable narrow-linewidth photonic terahertz (THz) carrier generation scheme using a distributed-Bragg-reflector-based mode-locked laser diode (MLLD) with optical feedback and mode filtering technique is proposed and experimentally demonstrated. Photonic terahertz carrier covering the D-band (110–170 GHz), and H-band (220–325 GHz) was obtained. With the assistance of the feedback loop, the optical linewidth of the MLLD was reduced from MHz to kHz level, and the heterodyning photonics carrier linewidth was reduced from 121.7 kHz to 2.1 kHz, satisfying the linewidth tolerance in the THz communication system with high-order modulation formats.

中文翻译：

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使用光反馈锁模激光二极管产生光子太赫兹载波

提出了一种可调谐的窄线宽光子太赫兹（THz）载流子产生方案，该方案使用基于分布式布拉格反射器的锁模激光二极管（MLLD）并具有光反馈和模式滤波技术，并进行了实验证明。获得了覆盖D波段（110–170 GHz）和H波段（220–325 GHz）的光子太赫兹载波。借助反馈环路，MLLD的光线宽从MHz降低到kHz级别，外差光子载波的线宽从121.7 kHz降低到2.1 kHz，满足了高阶THz通信系统中的线宽容限调制格式。