Optical Filter Design and Analysis
Optical Filter Design and Analysis
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DOI：
10.1002/0471213756
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发表时间：
1999-06
期刊：
影响因子：
--
通讯作者：
C. Madsen;Jian H. Zhao
中科院分区：
文献类型：
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作者：
C. Madsen;Jian H. Zhao
光滤波器的频率特性可以根据期望的响应进行定制，是开发光纤通信系统全带宽潜力的使能技术。光学滤波器的设计通常采用在频域或时域中求解场的电磁模型。这些技术是表征波导特性和单个器件（如定向耦合器）所必需的；然而，对于过滤器设计来说，它们可能变得笨重和不直观。一种更高层次的方法，专注于提供洞察力的滤波器特性，快速计算滤波器响应，并且易于缩放更大和更复杂的滤波器，在本书中得到解决。滤波器的重要特性与电子滤波器和数字滤波器相同。例如，通带宽度，阻带抑制，以及通带和阻带之间的过渡宽度都是带通滤波器的设计参数。对于高比特率光通信系统，还必须了解和控制滤波器的色散特性。考虑到模拟和数字滤波器设计的大量知识，以类似的方式分析光学滤波器是有利的。特别是，这本书是独特的呈现数字信号处理技术的光学滤波器的设计，提供背景材料和理论和实验研究成果。所描述的光学滤光器基本上是广义干涉仪，它以波长无关的方式将输入信号分成许多路径，延迟和重组。通过改变分裂和重组比以及延迟来改变频率响应。使用数字滤波器，可以在不考虑损耗或所需增益的情况下进行拆分和重组；然而，滤光片损耗是光学滤光片设计的主要考虑因素。延迟通常是最小公共延迟的整数倍。一个众所周知的例子是一堆薄膜介电材料，其中每一层是四分之一
Optical filters whose frequency characteristics can be tailored to a desired response are an enabling technology for exploiting the full bandwidth potential of optical fiber communication systems. Optical filter design is typically approached with electromagnetic models where the fields are solved in the frequency or time domain. These techniques are required for characterizing waveguide properties and individual devices such as directional couplers; however, they can become cumbersome and non-intuitive for filter design. A higher level approach that focuses on the filter characteristics providing insight, fast calculation of the filter response, and easy scaling for larger and more complex filters is addressed in this book. The important filter characteristics are the same as those for electrical and digital filters. For example, passband width, stopband rejection, and the transition width between the passband and stopband are all design parameters for bandpass filters. For high bitrate optical communication systems, a filter’s dispersion characteristics must also be understood and controlled. Given the large body of knowledge about analog and digital filter design, it is advantageous to analyze optical filters in a similar manner. In particular, this book is unique in presenting digital signal processing techniques for the design of optical filters, providing both background material and theoretical and experimental research results.The optical filters described are fundamentally generalized interferometers which split the incoming signal into many paths, in an essentially wavelength independent manner, delayed and recombined. The splitting and recombining ratios, as well as the delays, are varied to change the frequency response. With digital filters, the splitting and recombining are done without concern for loss or the required gain; whereas, filter loss is a major design consideration for optical filters. The delays are typically integer multiples of a smallest common delay. A well-known example is a stack of thin-film dielectric materials where each layer is a quarter-