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Summary
This summary is machine-generated.

This study models spontaneous Raman scattering (SpRS) in quantum-classical systems using few-mode fiber (FMF). Optimized FMF design reduces noise, enhancing quantum signal transmission by over 40%.

Keywords:
coexistence systemfew-mode fiberquantum key distributionspontaneous Raman scattering

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Area of Science:

  • Optical Communications
  • Quantum Information Science
  • Fiber Optics

Background:

  • Spontaneous Raman scattering (SpRS) poses a significant noise challenge in quantum-classical coexistence systems.
  • Few-mode fiber (FMF) integrated with wavelength-division multiplexing (WDM) and spatial-division multiplexing (SDM) offers potential for increased capacity but introduces complex crosstalk effects.
  • Understanding and mitigating SpRS is crucial for reliable quantum signal transmission.

Purpose of the Study:

  • To develop a spontaneous Raman scattering (SpRS) model for quantum-classical coexistence systems utilizing FMF with WDM and SDM.
  • To analyze the influence of mode coupling, mode count, and wavelength count on SpRS.
  • To propose an optimized FMF design for noise mitigation and enhanced quantum signal transmission.

Main Methods:

  • Development of an SpRS model based on mode crosstalk theory.
  • Numerical calculations to assess the impact of key factors on SpRS.
  • Design and simulation of a ring-assisted FMF for noise reduction.

Main Results:

  • Identified dominant contributors to SpRS and their relative impact magnitudes.
  • Quantified the influence of mode coupling, number of modes, and wavelengths on SpRS.
  • Demonstrated that the optimized ring-assisted FMF can enhance quantum signal transmission distance by up to 41.5%.

Conclusions:

  • Mode crosstalk significantly influences SpRS in FMF systems.
  • The proposed ring-assisted FMF effectively mitigates noise impacts from SpRS.
  • Optimized FMF designs are essential for advancing long-distance quantum signal transmission in WDM/SDM systems.