Microwave signal filtering is a fundamental and central functionality in radio-frequency (RF) systems. Underpinned by advanced integrated photonics technologies, emerging integrated microwave photonic (IMWP) filter platforms enable reconfigurable and widely tunable RF signal filtering functionalities that were unattainable using conventional electronics while also exhibiting superior features in terms of compactness, light weight, stability, low power consumption, and low latency. This paper presents a comprehensive review of the principles, architectures, and performance of IMWP filters. We highlight recent advances of IMWP filters enabled by on-chip nonlinear optics, RF-interference technology and emerging integration platforms, with an emphasis on the RF performance which is critical for their usability in real-world applications. We conclude with a perspective on future research challenges and new possibilities for IMWP filters.

中文翻译：

---

集成微波光子滤波器

微波信号滤波是射频 (RF) 系统中的一项基本和核心功能。在先进的集成光子学技术的支持下，新兴的集成微波光子 (IMWP) 滤波器平台实现了使用传统电子设备无法实现的可重新配置和广泛可调的射频信号滤波功能，同时还表现出在紧凑、重量轻、稳定性、低功耗、和低延迟。本文全面回顾了 IMWP 过滤器的原理、架构和性能。我们重点介绍了由片上非线性光学、射频干扰技术和新兴集成平台实现的 IMWP 滤波器的最新进展，并强调射频性能对其在实际应用中的可用性至关重要。