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Study of microcomb threshold power with coupling scaling.

Pei-Hsun Wang1, Kuan-Lin Chiang2, Zong-Ren Yang2

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Summary
This summary is machine-generated.

We optimized microcomb generation by analyzing cavity coupling. This research provides guidelines for designing low-power, high-efficiency microcombs (≥40%) near the generation threshold.

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Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Photonics

Background:

  • Microcombs are crucial for applications like spectroscopy and optical communications.
  • Understanding their generation threshold and conversion efficiency is key to optimizing performance.
  • Cavity coupling is a critical parameter influencing microcomb dynamics.

Purpose of the Study:

  • To model and analyze the generation threshold and conversion efficiency of microcombs.
  • To investigate the impact of cavity coupling on microcomb generation.
  • To provide design guidelines for low-power, high-efficiency microcomb operation.

Main Methods:

  • Utilized the Lugiato-Lefever equation (LLE) for quantitative analysis.
  • Performed numerical solutions for threshold power considering large detuning and Kerr-induced phase shift.
  • Investigated the parameter space of pump power and coupling.

Main Results:

  • Established a quantitative analysis of the generation threshold in the pump power and coupling parameter space.
  • Identified minimum threshold power at over-coupling, consistent with traveling wave theory.
  • Demonstrated the accessibility of high-efficiency (≥40%), stable microcombs around the threshold by tuning coupling.

Conclusions:

  • Cavity coupling significantly influences microcomb generation threshold and efficiency.
  • Optimal microcomb performance is achievable near the generation threshold with appropriate coupling.
  • This study offers universal guidelines for designing efficient and stable microcombs.