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Cylindrical vector beam multiplexer/demultiplexer using off-axis polarization control.

Shuqing Chen1, Zhiqiang Xie1, Huapeng Ye2

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Researchers developed a novel metasurface for cylindrical vector beam (CVB) multiplexing and demultiplexing. This breakthrough enables high-capacity optical communication by precisely controlling off-axis polarization.

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Area of Science:

  • Optics and Photonics
  • Optical Communication

Background:

  • Cylindrical vector beams (CVBs) offer potential for high-capacity optical communication.
  • Existing methods for CVB coupling/separation are limited by the lack of effective off-axis polarization control.

Purpose of the Study:

  • To develop a novel metasurface for efficient CVB multiplexing and demultiplexing.
  • To enable advanced optical communication systems through precise polarization control.

Main Methods:

  • Utilized a metal-dielectric-metal metasurface for off-axis polarization control.
  • Leveraged spin-to-orbit interactions to independently modulate left- and right-handed circularly polarized components of CVBs.
  • Exploited light path reversibility and vector mode conservation for simultaneous multiplexing/demultiplexing.

Main Results:

  • Demonstrated broadband operation from 1310 to 1625 nm, compatible with wavelength-division-multiplexing.
  • Achieved a four-channel CVB multiplexing communication with a transmission rate of 1.56 Tbit/s.
  • Obtained a bit-error-rate of 10^-6 at -21.6 dBm receive power.

Conclusions:

  • The developed metasurface provides an effective solution for CVB multiplexing/demultiplexing.
  • This technology paves the way for high-capacity CVB communication systems.
  • The approach integrates wavelength-division-multiplexing and polarization-division-multiplexing for enhanced performance.