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Brian Stern1,2, Xingchen Ji1,2, Yoshitomo Okawachi3

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Researchers developed a laser-integrated Kerr frequency comb generator using silicon nitride waveguides. This compact device achieves low-noise soliton-mode-locked combs with low electrical power, enabling portable frequency references.

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Area of Science:

  • Photonics and nonlinear optics.
  • Integrated photonics and microresonator devices.

Background:

  • Optical frequency combs provide precise frequency and timing.
  • Microresonator-based Kerr frequency combs offer compact and efficient devices.
  • Integration of lasers with microresonators is key for advanced comb generation.

Purpose of the Study:

  • To demonstrate a laser-integrated Kerr frequency comb generator.
  • To achieve low-noise soliton-mode-locked combs with high efficiency.
  • To explore the potential for portable and robust frequency references.

Main Methods:

  • Utilized extremely low-loss silicon nitride waveguides for integrated laser and microresonator cavities.
  • Employed a dual-cavity configuration for laser-microresonator integration.
  • Operated the device with low electrical pump power.

Main Results:

  • Generated low-noise soliton-mode-locked combs with a repetition rate of 194 GHz.
  • Achieved comb generation near 1,550 nm using only 98 mW of electrical pump power.
  • Demonstrated the flexibility and efficiency of the integrated dual-cavity design.

Conclusions:

  • The developed device fulfills the potential for compact, scalable, and power-efficient Kerr frequency combs.
  • The chip-based integration enables highly portable and robust frequency and timing references, sensors, and signal sources.
  • This platform provides tools for investigating comb and soliton generation dynamics.