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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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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.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, 200241, China

    Meng-xu Chang  (常梦旭), Jing Xu  (徐景) & Yang Chen  (陈阳)

  2. School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan, 430074, China

    Li-zhong Jiang  (江利中)

  3. Shanghai Radio Equipment Research Institute, Shanghai, 200090, China

    Li-zhong Jiang  (江利中) & Qing-bo Liu  (刘庆波)

Authors
  1. Meng-xu Chang  (常梦旭)
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  2. Li-zhong Jiang  (江利中)
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  3. Qing-bo Liu  (刘庆波)
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  4. Jing Xu  (徐景)
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  5. Yang Chen  (陈阳)
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Corresponding author

Correspondence to Yang Chen  (陈阳).

Additional information

This work has been 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), and the Fundamental Research Funds for the Central Universities.

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Chang, Mx., Jiang, Lz., Liu, Qb. et al. Evaluation of the performance of linearly frequency modulated signals generated by heterodyning two free-running laser diodes. Optoelectron. Lett. 17, 266–270 (2021). https://doi.org/10.1007/s11801-021-0103-9

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  • DOI: https://doi.org/10.1007/s11801-021-0103-9

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