Nonlinear optical processing is becoming a prominent field in modern photonics that empowers technological progress in various fields including optical sensing, optical laser technology, all-optical signal processing, optical image, and quantum optics. In this context, nonlinear optical devices, components, systems and their interrelated applications might play a significant role as they could allow the implementation of high-speed future generation networks, intelligent optical systems, optical processors, THz radiation by optical rectification, optical frequency generation, or of intermediate wavelengths in the visible and infrared range by various parametric processes.

Furthermore, the realization of reconfiguring optical devices and the learning of fundamental aspects of photonics. Encouraged by this context, researchers have been focusing their efforts on the development of nonlinear optical devices, components, systems that can be seamlessly integrated with existing optical systems and devices, and, at the same time, show the innovative functionalities of nonlinear optical processing impact considered fundamental to any future implementation of systems and devices in the optical domain.

This Special Issue will provide a forum for the most recent advances in the modeling of nonlinear optical signal processing devices, components, systems, and their related phenomena. Submissions are expected in relation to the development and characterization of new nonlinear optical systems, devices, components, and design applications in the optical domain. The manuscript may include mathematical, design, analytical concept, simulation, design, research, system design, novel design concepts, and hardware realization, and experiments for nonlinear optical signal processing. Moreover, we also encourage submissions discussing validation with experiments and connection with nonlinear optical signal processing models. The aim of this Special Issue is to bring together original research and review articles that focus on all aspects of nonlinear optical signal processing. Submissions can include interfacial transport, parameter estimation, closure considerations, numerical simulation, experiments, performance analysis, and experimental procedures.

Potential topics include but are not limited to the following:

• Mathematical modelling of nonlinear optical devices, systems, and components
• Numerical design of nonlinear optical signal processing
• Numerical algorithms for nonlinear optical signal processing
• Nonlinear optical signal processing materials
• Nonlinear optical THz generation and detection
• New phase-matching techniques
• Nonlinear optical parametric processes
• All optical light switches and modulators
• All optical processing
• Wave mixing and phase conjugation
• Second-harmonic generation (SHG)
• Quasi-phase matching in optical wave-guides
• Nonlinear waves and solitons
• Fiber and integrated optics
• Ultrafast phenomena
• Quantum optics
• Novel optical fields