In this paper, a liquid crystal tunable thin-film optical bandpass filter is studied and analyzed using the signal flow graph technique. This paper investigates an exact form for calculating the transmission coefficients, reflection coefficients, and the transmission intensity of the filter. The simulation results show the filter performance and the channel shape profile. In addition, the results show the tuning capability of the filter. The signal flow graph technique provides an attractive method for analyzing the thin-film optical filters since it overcomes the difficulty of the refractive index concept in extending to optical applications. Moreover, it simplifies the filter analysis and design process.

中文翻译：

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使用信号流图技术分析液晶可调谐薄膜光学滤波器

本文利用信号流图技术对液晶可调薄膜光学带通滤波器进行了研究和分析。本文研究了计算滤波器的透射系数、反射系数和透射强度的精确形式。仿真结果显示了滤波器性能和通道形状轮廓。此外，结果显示了滤波器的调谐能力。信号流图技术为分析薄膜滤光片提供了一种有吸引力的方法，因为它克服了将折射率概念扩展到光学应用的困难。此外，它还简化了滤波器分析和设计过程。