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Evaluation of the performance of linearly frequency modulated signals generated by heterodyning two free-running laser diodes

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【作者】 常梦旭； 江利中； 刘庆波； 徐景； 陈阳；

【Author】 CHANG Meng-xu;JIANG Li-zhong;LIU Qing-bo;XU Jing;CHEN Yang;Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University;School of Artificial Intelligence and Automation, Huazhong University of Science and Technology;Shanghai Radio Equipment Research Institute;

【通讯作者】 陈阳;

【机构】 Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University； School of Artificial Intelligence and Automation, Huazhong University of Science and Technology； Shanghai Radio Equipment Research Institute；

【摘要】 A method to evaluate the influence of the laser linewidth on the linearly frequency-modulated(LFM) signals generated by heterodyning two free-running laser diodes(LDs) is proposed. The Pearson correlation coefficient between the instantaneous frequency of the generated LFM signal and that of an ideal LFM signal is introduced to quantify the quality of the generated LFM signal. The closed-form solution of the correlation coefficient is given, which shows that the correlation coefficient is determined by the ratio of the LFM signal bandwidth to the square root of the total linewidth of the two LDs when the observation interval is fixed. Simulation results are also given, which proves the correctness of the theoretical results.

【Abstract】 A method to evaluate the influence of the laser linewidth on the linearly frequency-modulated(LFM) signals generated by heterodyning two free-running laser diodes(LDs) is proposed. The Pearson correlation coefficient between the instantaneous frequency of the generated LFM signal and that of an ideal LFM signal is introduced to quantify the quality of the generated LFM signal. The closed-form solution of the correlation coefficient is given, which shows that the correlation coefficient is determined by the ratio of the LFM signal bandwidth to the square root of the total linewidth of the two LDs when the observation interval is fixed. Simulation results are also given, which proves the correctness of the theoretical results.

【关键词】 modulated； linearly； running； bandwidth； quantify； coherent； stationary； locked； instantaneous； correctness；
【基金】 supported by the National Key R&D Program of China (No.2017YFE0121500);the National Natural Science Foundation of China (Nos.61971193 and 61601297);the Open Fund of State Key Laboratory of Advanced Optical Communication Systems and Networks,Peking University,China (No.2020GZKF005);the Fundamental Research Funds for the Central Universities
  • 【文献出处】 Optoelectronics Letters ,光电子快报(英文版) , 编辑部邮箱 ,2021年05期
  • 【分类号】TN31
  • 【下载频次】21
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