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Optimized chaotic Brillouin dynamic grating with filtered optical feedback.

Jianzhong Zhang1,2, Zhuping Li3,4, Yuan Wu3,4

  • 1Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China. zhangjianzhong@tyut.edu.cn.

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Filtered optical feedback (FOF) effectively eliminates spurious Brillouin dynamic gratings (BDGs) in chaotic semiconductor lasers. This method improves the application of chaotic BDGs by preventing unwanted periodic signals, enhancing their performance.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Nonlinear Dynamics

Background:

  • Chaotic Brillouin dynamic gratings (BDGs) offer unique advantages like single, permanent, and localized grating creation.
  • Conventional optical feedback (COF) in chaotic lasers can generate spurious BDGs, limiting practical applications.
  • Eliminating spurious BDGs is crucial for harnessing the full potential of chaotic BDGs.

Purpose of the Study:

  • To propose and investigate a filtered optical feedback (FOF) scheme to suppress spurious BDGs in chaotic semiconductor lasers.
  • To demonstrate the effectiveness of FOF in eliminating unwanted periodic signals that lead to spurious BDGs.
  • To analyze the impact of FOF on the characteristics and performance of chaotic BDGs.

Main Methods:

  • Implementing a filtered optical feedback (FOF) system with controlled spectral width and detuning.
  • Utilizing chaotic laser outputs as pump waves to generate chaotic BDGs in a polarization-maintaining fiber.
  • Conducting comparative analysis between COF and FOF schemes to evaluate BDG generation.

Main Results:

  • FOF effectively suppresses spurious BDGs, overcoming limitations associated with COF.
  • The reflection characterization of chaotic BDGs is significantly improved using the FOF scheme.
  • Analysis reveals the influence of FOF on the reflection and gain spectra of the generated chaotic BDGs.

Conclusions:

  • Filtered optical feedback (FOF) is a viable method for eliminating spurious BDGs in chaotic semiconductor lasers.
  • The FOF technique enhances the quality and applicability of chaotic BDGs for advanced optical applications.
  • Further analysis of FOF's spectral influence provides insights for optimizing chaotic BDG generation.