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.
frequency dissemination two-section DFB laser phase stability 
Chinese Optics Letters
2024, 22(1): 013903
Author Affiliations
1 College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2 School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
3 Photonics Information Technology Laboratory, Institute of Communication Engineering, Army Engineering University of PLA, Nanjing 210007, China
We demonstrate a high-resolution frequency-modulated continuous-wave dual-frequency LIDAR system based on a monolithic integrated two-section (TS) distributed feedback (DFB) laser. In order to achieve phase locking of the two lasers in the TS-DFB laser, the sideband optical injection locking technique is employed. A high-quality linear frequency-modulated signal is achieved from the TS-DFB laser. Utilizing the proposed LIDAR system, the distance and velocity of a target can be measured accurately. The maximum relative errors of distance and velocity measurement are 1.6% and 3.18%, respectively.
dual-frequency LIDAR integrated two-section DFB laser frequency-modulated continuous wave linear frequency modulation 
Chinese Optics Letters
2021, 19(11): 111402

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