Zhen Che

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In this paper, we established a optical model and optimized a double-sided hemispherical patterned sapphire substrate (PSS) for highly efficient flip-chip GaN-based light emitting diodes (LEDs). A simulation is conducted to study how light extraction efficiency changes with the change in the parameters of the unit hemisphere for LEDs fabricated on(More)
This study reports on the development of a cost- and time-effective means to optimize a double-sided spherical cap-shaped patterned sapphire substrate (PSS) for highly efficient flip-chip GaN-based light-emitting diodes (LEDs). A simulation is conducted to study how light extraction efficiency (LEE) changed as a function of alteration in the parameters of(More)
In order to design couplers based on side-polished photonic crystal fiber (SPPCF), we made the simulation and calculated the optimum residual radius. A model of coupling region of SPPCF coupler was established. By using Rsoft software, optical propagation characteristics of SPPCF coupler was calculated with different residual radius. The simulation showed(More)
In this paper, we established a optical model and made an analysis of GaN-based LED flip chip by double-sided PSS (patterned sapphire substrate). The result analysis shows that the small distance and large radius of micro-cylinder and micro-hemisphere for cylindrical and hemispherical PSS would be more effective to enhance LED efficacy. The hemispherical(More)
—Visible light communication (VLC) could provide short-range optical wireless communication together with illumination using LED lighting. However, conventional forward error correction (FEC) codes for reliable communication do not have the features for dimming support and flicker mitigation which are required in VLC for the main functionality of lighting.(More)
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