Speaker
Description
Degenerate optical parametric oscillators (DOPOs) based on Kerr nonlinear microresonators have emerged as a promising platform for applications ranging from squeezed-light generation to photonic computing [1–3]. While significant progress has been made in understanding their steady-state operation, their nonlinear dynamical behaviour remains comparatively unexplored.
Here, we theoretically and experimentally investigate the nonlinear dynamics of a dual-pumped $χ^{(3)}$ DOPO implemented in a silicon nitride microring resonator. By independently controlling the detuning of two continuous-wave pumps, we map the system response across a broad operating parameter space. Distinct monostable, reentrant, and oscillatory regimes are identified and reproduced using coupled nonlinear mode equations.
Analytical steady-state solutions and stability analysis reveal that specific unstable branches undergo Hopf bifurcations, driving the system into self-sustained Kerr oscillations [4]. Numerical simulations predict oscillation frequencies of approximately 45 MHz that can be continuously tuned through pump detuning and optical power. Experimental measurements confirm the existence of these oscillatory states, with oscillation frequencies near 51 MHz and excellent agreement with theoretical predictions.
Beyond identifying the origin of these instabilities, we demonstrate controlled excitation and suppression of oscillatory behaviour through pump-frequency tuning. These results establish a comprehensive picture of the nonlinear dynamical landscape of integrated DOPOs and provide practical guidance for their stable operation in both classical and quantum photonic applications. Furthermore, the observed tunable oscillatory states suggest a route towards integrated microwave and RF photonic signal generation. A detailed account of the underlying nonlinear dynamics, including oscillatory and chaotic regimes, is presented in Ref. [5].
References:
[1] Okawachi et al., Opt. Lett. 40, 5267–5270 (2015);
[2] Tomazio et al., ACS Photonics 12, 227–235 (2025);
[3] Marandi et al., Opt. Express 20, 19322–19330 (2012);
[4] Mazo-Vásquez et al., arXiv:2512.14168 (2025);
[5] Trinchão et al., arXiv:2605.18690 (2026).
| I am the presenting author | Yes |
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