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Integrated Soliton Microcombs beyond the Turnkey Limit
Ze Wang1, Tianyu Xu1, Yuanlei Wang1,2
1Peking University, State Key Laboratory for Artificial Microstructure and Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Beijing 100871, China.
Physical Review Letters
|August 10, 2026
Summary
Integrated soliton microcombs achieve broader bandwidths using an auxiliary resonator. This method allows access to a far-detuned soliton regime, enhancing microcomb performance beyond current limits.
Area of Science:
- Photonics
- Integrated Optics
- Nonlinear Optics
Background:
- Self-injection locking (SIL) enables soliton microcombs with stable initiation and high coherence.
- However, SIL limits pump detuning, restricting the achievable spectral bandwidth of microcombs.
Purpose of the Study:
- To overcome the detuning limitation in SIL soliton microcombs.
- To achieve broader bandwidths in integrated soliton microcombs.
- To introduce a new control mechanism for frequency tuning.
Main Methods:
- Utilizing an auxiliary resonator to dynamically hybridize the pump mode.
- Implementing adiabatic passage to access a far-detuned soliton regime.
- Characterizing a 25-GHz soliton microcomb system.
Main Results:
- Successfully accessed a far-detuned soliton regime while maintaining linewidth narrowing.
- Increased the 3-dB bandwidth of a 25-GHz soliton microcomb from 17.1 nm to 26.8 nm.
- Introduced an additional degree of freedom for near-orthogonal frequency tuning.
Conclusions:
- The auxiliary resonator hybridization technique effectively broadens integrated soliton microcombs.
- This method provides a pathway to microcombs with performance exceeding the limitations of standard SIL.
- The approach offers enhanced control over microcomb frequency tuning.
