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Combining a low-coherence source with silicon nitride ring resonators featuring normal group velocity dispersion enables electrically pumped, high-power microcombs, providing on-chip power up to 158 mW and high-coherence comb lines with linewidths as narrow as 200 kHz.

Optical frequency combs in the mid-infrared are required for molecular gas detection applications but their realization in compact microresonator-based platforms is challenging. Here, Griffith et al. demonstrate on-chip broadband comb generation on a silicon microresonator spanning from 2.1 to 3.5 μm.

Breather solitons can be found in both physical and biological nonlinear systems. Here, Yuet al. demonstrate this type of soliton in silicon and silicon nitride microresonators, which advances the understanding of soliton-based comb-generation in microresonators.

Dual-comb spectroscopy is a powerful tool for realizing rapid spectroscopic measurements with high sensitivity and selectivity. Here, Yu et al. demonstrate silicon microresonator-based dual comb spectroscopy in the mid-infrared region, where strong vibrational resonances of many liquids exist.

Using stimulated Brillouin scattering to achieve extremely high optical gain in silicon nanostructures may allow the realization of new integrated chip-scale photonic devices.

The use of a photonic network of coupled degenerate optical parametric oscillators for solving complex optimisation problems would require scalable integration capabilities. Here, the authors exploit χ (3) nonlinearity in SiN to demonstrate on-chip phase-tunable coupling between two DOPO based Ising nodes.

Integrating an optical Kerr frequency comb source with an electronically excited laser pump produces a battery-powered comb generator that does not require external lasers, moveable optics or laboratory set-ups.

Temporal cloaking hides an event in time from being detected; here this is achieved by speeding up one end of a probe beam and slowing down the other to create a ‘time hole’ and to close it afterwards so that the signal amplitude of an event is much reduced.

By exploiting the nonlinearity of on-chip silicon nanowaveguides, a parametric temporal imaging system that can compress optical waveforms in time is demonstrated, enabling generation of complex and rapidly updatable ultrafast optical waveforms.

We demonstrate an all-optical, mode-locking, Kerr-comb frequency division method that provides a chip-scale microwave source that is extremely versatile, accurate, stable and has ultralow noise, using only a single continuous-wave laser.

Researchers design and demonstrate a scalable yet compact chip-based link architecture that may enable terabit-scale optical interconnects for hyperscale data centres.

A femtosecond pulse generator is realized using an electro-optic time-lens system integrated on a lithium niobate photonic chip, capable of tunable repetition rates and wavelengths.

Synchronization of two optical microresonator frequency combs coupled over distances larger than 20 metres is experimentally realized, opening up applications of microresonator combs and offering a chip-based photonic platform for exploring complex nonlinear systems.