论文标题
基于宽带直接光子数字化的矢量网络分析
Vector network analysis based on wideband direct photonic digitizing
论文作者
论文摘要
由于测量和分析正在测试的对象的响应的能力，矢量网络分析仪（VNA）已成为各个领域中必不可少的工具之一，例如医学，材料，地质，交流等。常规的VNA通常基于混合体系结构，必须在精度，动态范围和带宽之间做出妥协。在本文中，我们提出了基于宽带直接光子数字化的宽带光子矢量网络分析仪（PVNA）。超强的光学列车直接降低了正在测试的对象的响应信号，然后进行了电式转换和量化，从而避免了传统VNA中复杂的下调程序。采用现有的商业设备，提出的PVNA不仅可以将测量频率范围扩展到110 GHz或更高，而且还可以达到高线性和准确性性能。为了验证理论分析，我们建立了一个实验性PVNA，实现了高达40 GHz的可测量频率，动态范围超过120 dB。带通滤波器的测得的散射参数实验结果与商业网络分析仪的散射结果非常一致。
Vector network analyzers (VNAs) have become one of the indispensable tools in various fields, such as medicine, material, geology, communication, and etc, due to the capacity of measuring and analyzing the response of the object under test. Conventional VNAs, commonly based on mixing architecture, have to make compromises among accuracy, dynamic range, and bandwidth. In this paper, we propose a wideband photonic vector network analyzer (PVNA) based on wideband direct photonic digitizing. Ultrastable optical trains directly undersample the response signals from objects under test, followed by electrooptic conversion and quantization, obviating the intricate downconversion procedures in traditional VNAs. Adopting existing commercial devices, the proposed PVNA can not only extend the measurement frequency range to 110 GHz or higher but also achieve a high linearity and accuracy performance. To validate the theoretical analysis, we establish an experimental PVNA, realizing a measurable frequency span of up to 40 GHz and a dynamic range of more than 120 dB. A measured scattering parameters of a bandpass filter The experimental result is well consistent with that of a commercial network analyzer.
