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Updated: May 14, 2025
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
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Nonlinear Dynamics of Coupled-Resonator Kerr Combs
Swarnava Sanyal1, Yoshitomo Okawachi1, Yun Zhao1
1Columbia University, Department of Applied Physics and Applied Mathematics, New York, New York 10027, USA.
Physical Review Letters
|April 11, 2025
Summary
We identified an instability in coupled microresonator systems that prevents mode locking. Introducing loss in the auxiliary resonator suppresses this instability, enabling efficient, high-power soliton combs for diverse applications.
Area of Science:
- Nonlinear optics
- Photonics
- Quantum optics
Background:
- Microresonator systems exhibit complex nonlinear dynamics, including soliton formation and chaos.
- Coupled-resonator systems can achieve deterministic mode locking and efficient frequency comb generation.
Purpose of the Study:
- Investigate the dynamical behavior of coupled-resonator systems in the normal group-velocity-dispersion regime.
- Understand the conditions leading to instability and methods for suppression.
- Provide insights for generating high-power, spectrally broad, and flat mode-locked combs.
Main Methods:
- Theoretical analysis and numerical simulations of coupled-resonator dynamics.
- Stability analysis of single- and multipulse solutions.
- Experimental verification using a silicon-nitride platform.
Main Results:
- Strong mode-coupling can induce an auxiliary resonator instability, preventing comb formation.
- Introducing loss into the auxiliary resonator effectively suppresses this instability.
- Theoretical predictions were experimentally validated.
Conclusions:
- Loss engineering in auxiliary resonators is crucial for stabilizing mode-locked states.
- This work facilitates access to high-performance frequency combs for spectroscopy, metrology, and communications.
- Understanding resonator dynamics is key to advancing photonic technologies.
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