Author Affiliations
Abstract
1 Engineering Research Center of Precision Photonics Integration and System Application, Ministry of Education & Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education & National Laboratory of Solid State Microstructures & College of Engineering and Applied Sciences & Institute of Optical Communication Engineering & Nanjing University-Tongding Joint Lab for Large-Scale Photonic Integrated Circuits, Nanjing University, Nanjing 210023, China
2 College of Electronics and Optical Engineering and College of Flexible Electronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
3 The 41st Research Institute of China Electronics Technology Group Corp, Qingdao 266000, China
The stable long-distance transmission of radio-frequency (RF) signals holds significant importance from various aspects, including the comparison of optical frequency standards, remote monitoring and control, scientific research and experiments, and RF spectrum management. We demonstrate a scheme where an ultrastable frequency signal was transmitted over a 50 km coiled fiber. The optical RF signal is generated using a two-section distributed feedback (DFB) laser for direct modulation based on the reconstruction equivalent chirp (REC) technique. The 3-dB modulation bandwidth of the two-section DFB laser is 18 GHz and the residual phase noise of -122.87 dBc/Hz is achieved at 10-Hz offset frequency. We report a short-term stability of 1.62×10-14 at an average time of 1 s and a long-term stability of 6.55×10-18 at the measurement time of 62,000 s when applying current to the front section of the DFB laser. By applying power to both sections, the stability of the system improves to 4.42×10-18 within a testing period of 56,737 s. Despite applying temperature variations to the transmission link, long-term stability of 8.63×10-18 at 23.9 h can still be achieved.
frequency dissemination two-section DFB laser phase stability 
Chinese Optics Letters
2024, 22(1): 013903
作者单位
摘要
河北大学物理科学与技术学院河北省光电信息与材料重点实验室,河北 保定 071002
可见光光源,特别是低激发密度的可见光光源,如半导体LED、荧光灯及太阳光,激发的紫外光C段(UVC)上转换材料在无感标识与防伪、光催化、生物和城市环境领域的抗菌等方面具有巨大的应用潜力。可见光激发UVC上转换材料要求:发光中心第一激发态具有较长的能级寿命,且能有效吸收可见光光子;基质材料能有效透过可见光和UVC。由于外层电子的屏蔽作用,稀土离子具有丰富的、寿命较长的能级;高带隙无机材料可以有效透过UVC,因此稀土离子掺杂的无机发光材料是可见光激发UVC上转换荧光体的理想选择。然而可见光激发UVC上转换荧光体较低的发射效率限制了应用,如何提高低激发密度下的UVC上转换功率是当前面临的最大难题。着重介绍可见光激发的UVC上转换材料发展过程,当前的可见光激发UVC上转换的研究现状,低激发密度研究领域面临的挑战、解决途径和方法。
材料 稀土掺杂材料 上转换 短波紫外光 低密度光源 太阳光 materials rare-earth-doped material up-conversion ultraviolet C low density light source sunlight 
激光与光电子学进展
2021, 58(15): 1516013

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