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Electrically empowered microcomb laser.

Jingwei Ling1, Zhengdong Gao1, Shixin Xue1

  • 1Department of Electrical and Computer Engineering, University of Rochester, Rochester, NY, USA.

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Summary
This summary is machine-generated.

We developed a new on-chip laser for mode-locked microcombs, overcoming challenges in initialization, efficiency, and reconfigurability. This breakthrough offers robust, on-demand microcomb generation for diverse applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Laser Technology

Background:

  • Optical microcombs are crucial for communication, metrology, and sensing.
  • Existing microcombs face challenges in soliton initialization, power efficiency, and reconfigurability.

Purpose of the Study:

  • To present an on-chip microcomb laser addressing key limitations of current technologies.
  • To demonstrate a robust, on-demand mode-locked microcomb generation system.

Main Methods:

  • Integration of a III-V gain chip with a thin-film lithium niobate (TFLN) photonic integrated circuit (PIC).
  • Development of a laser system enabling direct emission of mode-locked microcombs.

Main Results:

  • Achieved robust, turnkey operation with individual comb linewidths down to 600 Hz.
  • Demonstrated a whole-comb frequency tuning rate exceeding 2.4 × 10^17 Hz/s.
  • Attained 100% optical power utilization for comb generation.

Conclusions:

  • The TFLN-based PIC approach unifies simplicity, electro-optic reconfigurability, and high-speed tunability.
  • This technology enables on-demand mode-locked microcomb generation with broad application potential.