The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

Recent advances in microwave photonic systems are reviewed, including system
architectures for photonic generation of low-phase-noise microwave signals, linearly chirped …

The exotic physics emerging in non-Hermitian systems with balanced distributions of gain
and loss has recently drawn a great deal of attention. These systems exhibit phase …

The concept of synthetic dimensions in photonics has attracted rapidly growing interest in
the past few years. Among a variety of photonic systems, the ring resonator system under …

Microwave photonic approaches for the generation of microwave signals have attracted
substantial attention in recent years, thanks to the significant advantages brought by …

In quantum mechanics, with the groundbreaking discovery of parity-time symmetry (PT-
symmetry), Bender and Boettcher unfold the nature of the non-Hermitian Hamiltonian to …

Parity-time (PT) symmetry has attracted intensive research interest in recent years. PT
symmetry is conventionally implemented between two spatially distributed subspaces with …

Parity-time (PT) symmetry has been unveiling new photonic regimes in non-Hermitian
systems, with opportunities for lasing, sensing and enhanced light-matter interactions. The …

The optoelectronic oscillator (OEO) is the most widely investigated microwave photonic
hybrid system for the generation of microwave signal with high frequency and low phase …

As a paradigmatic microwave photonic resonant system that is capable of producing high-
quality self-sustained microwave oscillations, the optoelectronic oscillator (OEO) has been …