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The scintillation and bit error rate performance of optical wireless communication systems employing Laguerre-Gaussian (LG) beams were evaluated considering the size of the transmitted beam and receiving aperture. As a result, it was found that the system employing LG beams with a high radial number can reduce the effect of scintillation and improve communication quality.
Several methods for the generation of Laguerre-Gauss (LG) beams has been proposed, including conversion from Gaussian beam by liquid crystal optical devices. This method is easier than other methods, and generates "quantized" LG(5,1) beams. If this quantized LG beams propagate over a sufficiently long distance, only the propagation modes remain and LG beams can be generated. In this paper,...
In the last few years, many form of Learning Management Systems (LMS) have been introduced in many educational institutions with the main objective of obtaining meaningful information from the accumulated learning data to be then utilized for increasing the quality of the educations in those institutions. One of the most popular techniques for extracting information is by visualizing the high dimensional...
Free-space laser communications (FSO) is influenced by scintillation and propagation loss increases as the propagation distance becomes longer. Therefore, the communication quality is degraded. In this paper, we examined the propagation characteristics when error correction which is used to improve the communication quality in wireless communication is brought in FSO. As a result, it was confirmed...
In this research we propose a new motion classification method to improve operability of a 3D gesture interface that assists text input on mobile devices. A certain range of time-series finger scale data is cropped and is classified using linear discriminant analysis. To confirm possibility of linear separation, data were visualized using principle component analysis. Experimental result with changing...
Liquid crystal devices are electrically-controllable photonic devices and used in a wide range of ends such as filters, switches and spatial light modulators. So far, we developed smectic liquid crystal material as a liquid crystal device and realized multivalued amplitude/phase modulation and high-speed operation at 2kHz by proposing a high-speed driving scheme. However, because smectic material...
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