Abstract
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.
Highlights
Optical filters are considered as one of the most important elements of optical and electro-optical systems technology
Photodetectors, and optical filters represent some of the devices used in the optical communication networks. e tunable optical filters are considered vital components in the huge volume optical communication systems based on the wavelength multiplexing approach [1, 2]. e performance of the optical filters affects the overall signal to noise ratio (SNR) and the bit error ratio (BER) of optical communication systems
Liquid Crystal Tunable Optical Filter Structure e structure of the LC tunable filter is composed of two cascaded five-layer optical structure to form the reflective mirrors, with an LC sandwiched in between. e tuning capability in the suggested filter design is realized by inserting a liquid crystal (LC) in the filter cavity as the tuning medium. e effective refractive index of the nematic LC layers can be controlled applying an electric field
Summary
Optical filters are considered as one of the most important elements of optical and electro-optical systems technology. Signal flow graph has been proposed to overcome the drawbacks of the other approaches in difficulties due to the dependence in optics on the concepts of refractive index and to avoid the repeated summations in some other methods. A microwave approach and signal flow graph (SFG) approach were applied to analyze an optical multilayer system in [4].
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