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Orbital angular momentum mode division filtering for photon-phonon coupling.

Zhi-Han Zhu1, Li-Wen Sheng2, Zhi-Wei Lv2

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|January 11, 2017
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Summary
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Stimulated Brillouin scattering (SBS) noise is overcome using orbital angular momentum mode division filtering. This method separates weak signals from strong noise in integrated photonics, enabling quasi-noise-free photonic-phononic devices.

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Area of Science:

  • Nonlinear optics
  • Integrated photonics
  • Acoustic wave interactions

Background:

  • Stimulated Brillouin scattering (SBS) is a key light-matter interaction in transparent materials.
  • SBS is crucial for integrated photonics but suffers from inevitable noise.
  • This noise originates from unwanted coupling between photons and spontaneous phonons.

Purpose of the Study:

  • To propose and demonstrate a method to overcome SBS-induced noise.
  • To enable quasi-noise-free photonic-phononic operations.
  • To enhance signal discrimination in the presence of strong noise.

Main Methods:

  • Orbital angular momentum (OAM) mode division filtering was proposed and experimentally validated.
  • Utilized OAM as a distinguishable degree-of-freedom for signal separation.
  • Applied the method in waveguides supporting multi-orthogonal spatial modes.

Main Results:

  • Successfully demonstrated the discrimination and separation of weak signals from strong SBS noise.
  • Achieved quasi-noise-free photonic-phononic operation.
  • Validated the robustness and flexibility of the OAM filtering method.

Conclusions:

  • OAM mode division filtering effectively overcomes SBS noise.
  • This technique offers a practical solution for noise reduction in SBS processes.
  • The method is compatible with multi-mode waveguides, paving the way for advanced SBS devices.