发表机构
Graduate School of Sciences and Technology for Innovation, Tokushima University; Department of Physics, Toho University; Institute of Post-LED Photonics (pLED), Tokushima University; Institute of Photonics and Human Health Frontier (IPHF), Tokushima University; Sevensix Inc.（德岛大学科学技术创新研究生院; 东海大学物理系; 德岛大学后LED光子学研究所; 德岛大学光子学与人类健康前沿研究所; Sevensix公司）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出一种基于光纤干涉仪参考光频梳与集成EDFA的Vernier腔的双光注入锁定太赫兹合成器，实现230-320 GHz可调谐输出，在267 GHz处信噪比超70 dB，相位噪声达-95.7 dBc/Hz。
AI 中文摘要
我们展示了一种频率可调谐、低相位噪声的太赫兹（THz）合成器，它基于光纤干涉仪参考的光频梳（OFC）、掺铒光纤放大器（EDFA）集成的Vernier腔以及双光注入锁定（OIL）。Vernier腔将重复频率约为100 MHz的光纤OFC的密集模式转换为有效模式间隔为千兆赫兹量级的滤波梳，便于选择性单模OIL。Vernier腔内的腔内和腔外EDFA使得边模抑制比超过70 dB。对Vernier腔自由光谱范围和OFC重复频率的独立控制提供了灵活的Vernier滤波条件，用于选择双OIL的主模式。两个选定的梳状模式被转移到注入锁定的光载波上，并在单行载流子光电二极管中进行光子混频，以产生连续波THz信号。在230、267和320 GHz处演示了频率可调谐的THz生成。在267 GHz处，获得了超过70 dB的信噪比和在10 kHz偏移处测得的-95.7 dBc/Hz的相位噪声；相位噪声测量受到本地振荡器系统的限制。所提出的架构通过将基于光学参考的OFC与灵活的Vernier辅助梳状模式选择相结合，提供了一种基于光纤的频率可调谐、低相位噪声THz合成方法。
英文摘要
demonstrate a frequency-tunable, low-phase-noise terahertz (THz) synthesizer based on a fiber-interferometer-referenced optical frequency comb (OFC), an erbium-doped fiber amplifier (EDFA)-integrated Vernier cavity, and dual optical injection locking (OIL). The Vernier cavity converts the densely spaced modes of a fiber OFC with a repetition frequency of approximately 100 MHz into a filtered comb with gigahertz-scale effective mode spacing, facilitating selective single-mode OIL. Intracavity and extracavity EDFAs in the Vernier cavity enable a side-mode suppression ratio exceeding 70 dB. Independent control of the Vernier-cavity free spectral range and the OFC repetition frequency provides flexible Vernier filtering conditions for selecting master modes for dual OIL. Two selected comb modes are transferred to injection-locked optical carriers and photomixed in a uni-traveling-carrier photodiode to generate continuous-wave THz signals. Frequency-tunable THz generation is demonstrated at 230, 267, and 320 GHz. At 267 GHz, a signal-to-noise ratio exceeding 70 dB and a measured phase noise of -95.7 dBc/Hz at a 10-kHz offset are obtained; the phase-noise measurement is limited by the local-oscillator system. The proposed architecture provides a fiber-based approach to frequency-tunable, low-phase-noise THz synthesis by combining an optical-reference-based OFC with flexible Vernier-assisted comb-mode selection.
Comments39 pages, 8 figures
