Photonic signal processing of microwave signals
Photonic signal processing of microwave signals
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DOI：
10.1109/tmtt.2005.863060
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发表时间：
2006-02
影响因子：
4.3
通讯作者：
R. Minasian
中科院分区：
文献类型：
--
作者：
R. Minasian
光子信号处理提供了实现极高的多千兆赫采样频率的前景，克服了固有的电子限制。这源于光学延迟线固有的优良延迟特性。这些处理器提供了实现高时间带宽操作和高分辨率性能的新能力。光纤内信号处理器与光纤微波系统具有固有的兼容性，并且可以提供与内置信号调节的连接。光子信号处理的基本原理，包括采样，调谐和噪声，进行了讨论。提出了可以扩展光子信号处理器性能的结构，包括用于改善干扰抑制滤波器的滤波器形状特性的方法、用于增加带通滤波器的阻带衰减的技术以及用于实现大的自由光谱范围的方法。讨论了几种光子信号处理器，包括高分辨率微波滤波器、宽调谐滤波器、任意波形发生器和快速信号解调器。描述了解决光子信号处理器中的基本噪声问题的技术，并讨论了用于少抽头陷波滤波器的无相干结构。最后，一个新的概念，实现多抽头相干自由处理器滤波器，基于一种新的频移技术，提出。该结构不仅消除了相位感应强度噪声的限制，而且还可以产生大量的抽头，使处理器具有高性能和高分辨率的实现。
Photonic signal processing offers the prospect of realizing extremely high multigigahertz sampling frequencies, overcoming inherent electronic limitations. This stems from the intrinsic excellent delay properties of optical delay lines. These processors provide new capabilities for realizing high time-bandwidth operation and high-resolution performance. In-fiber signal processors are inherently compatible with fiber-optic microwave systems and can provide connectivity with built-in signal conditioning. Fundamental principles of photonic signal processing, including sampling, tuning, and noise, are discussed. Structures that can extend the performance of photonic signal processors are presented, including methods for improving the filter shape characteristics of interference mitigation filters, techniques to increase the stopband attenuation of bandpass filters, and methods to achieve large free spectral range. Several photonic signal processors, including high-resolution microwave filters, widely tunable filters, arbitrary waveform generators, and fast signal correlators, are discussed. Techniques to solve the fundamental noise problem in photonic signal processors are described, and coherence-free structures for few-tap notch filters are discussed. Finally, a new concept for realizing multiple-tap coherence-free processor filters, based on a new frequency-shifting technique, is presented. The structure not only eliminates the phase-induced intensity noise limitation, but can also generate a large number of taps to enable the achievement of processors with high performance and high resolution.