The quest towards the integration of ultra-fast, high-precision optical clocks is reflected in the
large number of high-impact papers on the topic published in the last few years. This interest …

Over the past decade, optical frequency combs generated by high-Q microresonators, or
optical microcombs, which feature compact device footprints, low power consumption, and …

Integrated femtosecond pulse and frequency comb sources are critical components for a
wide range of applications, including optical atomic clocks, microwave photonics …

Photonic integrated circuits are widely used in applications such as telecommunications and
data-centre interconnects,,,–. However, in optical systems such as microwave synthesizers …

Microwave photonic technologies, which upshift the carrier into the optical domain, have
facilitated the generation and processing of ultra-wideband electronic signals at vastly …

Optical frequency division based on bulk or fiber optics provides unprecedented spectral
purity for microwave oscillators. To extend the applications of this approach, the challenges …

The commercial success of radio-frequency acoustic filters in wireless communication
systems has launched aluminum nitride (AlN) as one of the most widely used …

Numerous modern technologies are reliant on the low-phase noise and exquisite timing
stability of microwave signals. Substantial progress has been made in the field of microwave …

Optical frequency division via optical frequency combs has enabled a leap in microwave
metrology, leading to noise performance never explored before. Extending this method to …

Frequency microcombs, alternative to mode-locked laser and fiber combs, enable miniature
rulers of light for applications including precision metrology, molecular fingerprinting and …