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Generalizing the ‘Kerr-induced synchronization’ concept by means of tailoring the synchronization at arbitrary modes allows to lock and control the repetition rate of a dissipative Kerr soliton frequency comb generated in a silicon nitride microring resonator.

The passive and electronics-free Kerr-induced synchronization of optical-frequency combs could be used in their control and stabilization and to simplify optical clock systems.

Kerr resonators can support a new form of parametrically driven temporal cavity soliton (and associated optical frequency comb), with potential performance advantages that include background-free operation and the possibility of very high pump-to-comb conversion efficiencies.

Optical frequency combs are a key technology in precision time keeping, spectroscopy and metrology. A theoretical proposal shows that introducing topological principles into their design makes on-chip combs more efficient and robust against fabrication defects.

Researchers demonstrate nonlinear wavelength converters whose output wavelengths are controlled with high accuracy by bandgap-protected wavenumber selectivity. Output frequencies are continuously tuned by nearly 300 GHz without compromising efficiency.

Flexible and coherent light generation is of paramount importance to enable new functionalities in integrated silicon photonics. Here the authors, develop an optical parametric oscillator with high conversion efficiency and high output power, based on the third order nonlinearity in a silicon nitride microresonator

Researchers have demonstrated spontaneous soliton formation in an edgeless photonic crystal resonator.

Integrated optical frequency measurements, benefit from broadband on-chip frequency combs. Here the authors present a low-noise microcomb whose span extends from telecom to near-visible wavelengths. Here the authors present a dissipative Kerr soliton formation approximated by introducing the concept of synthetic dispersion.

Combining resonant enhancement with nanophotonic mode engineering in a silicon nitride microring resonator allows spectral translation of a continuous-wave signal from the telecom band (~1,550 nm) to the visible band (~650 nm) through cavity-enhanced four-wave mixing with a translation efficiency of (30.1 ± 2.8)% at a pump power of (329 ± 13) μW.

Efficient photon pair sources connecting visible and telecommunication spectral regions are essential for viable long-distance fibre optic quantum communication architectures. A nanophotonic device is presented that allows kilometre-scale time–energy entanglement as an application.

By combining a photoinduced effective χ⁽²⁾ nonlinearity with resonant enhancement and perfect phase matching in a silicon nitride microring resonator, second-harmonic generation with milliwatt-level output powers with up to 22 ± 1% power conversion efficiency is demonstrated.

Despite larger nonlinear coefficients, waveguide losses have prevented using semiconductors instead of dielectric materials for on-chip frequency-comb sources. By significantly reducing waveguide loss, ultra-low-threshold Kerr comb generation is demonstrated in a high-Q AlGaAs-on-insulator microresonator system.

Broadband Kerr frequency combs require engineering of the dispersion profile of the microresonator, which is challenging to do in an arbitrary fashion, due to the material dispersion and limited number of geometric control parameters of typical platforms used. The authors show and discuss the limits of an arbitrary dispersion engineering technique, based on Fourier synthesis design of photonic crystal microrings, and investigate its impact on soliton formation.

Key steps towards photonic interposers for integrated optical synthesizers are shown: filters, mixers, linear processing of an octave-spanning microcomb, integration of microcomb and interposer layers, and a system-level feasibility analysis.