首页|Long-term ultrastable frequency dissemination via a 50-km spooled fiber link using a two-section DFB laser
Long-term ultrastable frequency dissemination via a 50-km spooled fiber link using a two-section DFB laser
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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 experi-ments,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-sec-tion 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 disseminationtwo-section DFB laserphase stability
尹知谦、张川博、管世健、周昕、王亚光、王磊磊、郑满航、刘奕彤、张云山、朱兴邦、方涛、陈向飞
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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
College of Electronics and Optical Engineering and College of Flexible Electronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China
The 41st Research Institute of China Electronics Technology Group Corp,Qingdao 266000,China
National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu Province of ChinaJiangsu Science and Technology Project
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