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A nano size single-mode waveguide for a silicon optical modulator was designed using the effective index method (EIM). The width of the waveguide was 350 nm for single-mode operation and the calculated optical confinement was 95.9%. The waveguide was fabricated on silicon-on-insulator (SOI) using e-beam lithography. The measured optical characteristics of the waveguide showed a propagation loss and...
We have compared the performance of analog and digitized radio-over-fiber (RoF) systems with a nonlinear channel condition to investigate which one is more suitable for in-building wireless backhauling. For the comparison, we demonstrated optical multicasting of Wi-Fi compatible signals over both RoF links with nonlinear wavelength conversion, and measured error vector magnitude (EVM) performance...
We developed Autonomous Buoy, which is composed of embedded system, OPC (Optical Particle Counter) and CTD (Conductivity, Temperature, Depth) sensors, to observe underwater environment. The vehicle is an autonomous profiling float that uses a buoyancy engine to cycle horizontally while moving up and down. The autonomous buoy is controlled by embedded system composed of field-programmable gate array...
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