Photonic implementation of a highly reconfigurable wideband RF spectral shaper
Photonic implementation of a highly reconfigurable wideband RF spectral shaper
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DOI：
10.1016/j.optcom.2019.03.077
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发表时间：
2019-08
影响因子：
2.4
通讯作者：
Jia Ge;Daniel A. Garon;M. Fok
中科院分区：
文献类型：
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作者：
Jia Ge;Daniel A. Garon;M. Fok
在新兴的射频（RF）系统中，由于多功能射频系统中的多频率操作以及与数据密集型应用相关的大信号带宽使用，动态处理大范围频带的能力是非常需要的。随着业务带宽的增加，射频组件和微波传输介质的频率响应均匀性下降，需要宽带射频频谱均衡来支持宽带高质量业务。因此，需要一种宽带和可重构的射频频谱整形器来动态地控制从低频段到高频频段的射频频谱。不幸的是，传统的射频电子器件在宽工作带宽下实现动态频谱控制是非常具有挑战性的。在本文中，我们利用光子学的优势，展示了一种高度可重构的射频频谱整形器，可以操纵数十GHz宽的射频频谱。该方案基于具有多个可调谐、可重构和可切换通带的微波光子滤波器架构。通过控制通带的形状、带宽和频率，实验实现了用于频谱均衡的高度可重构的宽带频率响应，覆盖了整个0至10 GHz频率范围，衰减可调至40 dB。各种射频均衡功能，包括可调谐的正/负斜率，非/倒抛物线，和多点频谱控制与可调谐的底板实验证明了使用所提出的系统。几个演示的射频功能也已应用于任意脉冲整形。射频频谱整形器可以动态调整以适应不同的场景，这可以使包括射频信号处理系统和通信网络在内的各种应用受益。
In emerging Radio Frequency (RF) systems, the capability to dynamically process a wide range of frequency bands is highly desired due to the multi-frequency operation in multi-function RF systems and the large signal bandwidth usage associated with data-intensive applications. As the operation bandwidth increases, the frequency response uniformity of both RF components and microwave transmission medium degrades, that leads to the need of broadband RF spectrum equalization to support wideband high-quality services. Therefore, a wideband and reconfigurable RF spectral shaper is highly desired for dynamically manipulating the RF spectrum from low- to high-frequency band. Unfortunately, it is very challenging for conventional RF electronics to achieve dynamic spectral control over a wide operation bandwidth. In this paper, we take advantages of photonics and demonstrate a highly-reconfigurable RF spectral shaper that can manipulate an RF spectrum of tens of GHz wide. The proposed scheme is based on a microwave photonic filter architecture with multiple tunable, reconfigurable and switchable passbands. By manipulating the shape, bandwidth, and frequency of the passbands, highly reconfigurable wideband frequency responses for spectral equalization are experimentally achieved, covering the entire 0 to 10 GHz frequency range with adjustable attenuation up to 40 dB. Various RF equalization functions including tunable positive/negative slope, non/inverted parabolic, and multi-point spectral control with tunable floor are experimentally demonstrated using the proposed system. Several of the demonstrated RF functions have also been applied to arbitrary pulse shaping. The RF spectral shaper can be tuned to adapt to different scenarios dynamically, which could benefit a variety of applications including RF signal processing systems and communication networks.