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Ultra-wideband optical diffractive network for mode multiplexing across the entire telecommunication range.

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Researchers developed an ultra-wideband mode multiplexing system covering O, E, S, C, L, and U bands. This breakthrough enhances spectrum utilization for future ultra-high-speed communication networks.

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Area of Science:

  • Optical Communications
  • Photonics
  • Telecommunications Engineering

Background:

  • Growing data traffic necessitates advanced multiplexing technologies.
  • Current research concentrates on C+L band hybrid multiplexing, aiming for over 10 Pb/s capacities.
  • Ultra-wideband (UWB) space division multiplexing (SDM) systems offer expanded spectrum for increased transmission capacity.

Purpose of the Study:

  • To propose and validate a comprehensive model for an ultra-wideband (O+E+S+C+L+U) wavelength-mode hybrid division multiplexing transmission system.
  • To enhance spectrum utilization and transmission capacity in optical communication systems.
  • To design and characterize a UWB mode multiplexer for broadband applications.

Main Methods:

  • Development of a comprehensive model for an O+E+S+C+L+U ultra-wideband mode multiplexing transmission system.
  • Design of a 4-linearly polarized mode multiplexer using an ultra-wideband optical diffractive network and an end-to-end inverse design algorithm.
  • Experimental validation of the mode multiplexer's performance, including mode purity, mode crosstalk, and operational bandwidth.

Main Results:

  • The designed mode multiplexer achieved over 90% mode purity and mode crosstalk below -17 dB.
  • In back-to-back systems, the multiplexer-demultiplexer exhibited crosstalk below -8.87 dB.
  • Experimental validation confirmed a supported bandwidth exceeding 420 nm across O, E, S, C, L, and U bands.
  • Demonstrated efficacy in broadband wavelength-mode hybrid division multiplexing communications.

Conclusions:

  • The proposed ultra-wideband wavelength-mode hybrid division multiplexing system significantly enhances spectrum utilization.
  • The developed mode multiplexer exhibits excellent performance metrics (mode purity, crosstalk) and broad bandwidth compatibility.
  • This technology promises highly efficient ultra-high-speed communication systems for future applications, compatible with existing infrastructure.