Chinese Optics Letters, 2024, 22 (1): 013903, Published Online: Jan. 19, 2024  

Long-term ultrastable frequency dissemination via a 50-km spooled fiber link using a two-section DFB laser

Author Affiliations
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.

Zhiqian Yin, Chuanbo Zhang, Shijian Guan, Xin Zhou, Yaguang Wang, Leilei Wang, Manhang Zheng, Yitong Liu, Yunshan Zhang, Xingbang Zhu, Tao Fang, Xiangfei Chen. Long-term ultrastable frequency dissemination via a 50-km spooled fiber link using a two-section DFB laser[J]. Chinese Optics Letters, 2024, 22(1): 013903.

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