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arXiv · 2604.02274

Temporal soliton generation in an ultra-high-effective-Q Kerr resonator enabled by Raman gain

Georges Semaan·Yifan Sun·Nicolas Englebert·Simon-Pierre Gorza·François Leo
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Abstract

We demonstrate temporal pattern formation in a coherently driven fiber ring cavity whose effective finesse is continuously reconfigured using distributed Raman amplification. We achieve an effective finesse of up to $\mathcal{F}_{\mathrm{eff}}\approx800$, corresponding to a linewidth of approximately 725 Hz ($Q\approx2.7\times10^{11}$) at 1555 nm. By exploiting the resulting increase in effective photon lifetime, we excite stable temporal cavity solitons and generate a low-repetition-rate frequency comb with a spacing of 580~kHz. Finally, we analyze the impact of the Raman loss-compensation mechanism, particularly its associated noise and show that a trade-off exists between soliton excitation threshold and stability.

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Georges Semaan, Yifan Sun, Nicolas Englebert, Simon-Pierre Gorza, François Leo. 2026-04-02. Temporal soliton generation in an ultra-high-effective-Q Kerr resonator enabled by Raman gain. https://arxiv.org/abs/2604.02274

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