Abstract
This study proposes an optical coupler that can improve the coupling efficiency of the daylight collecting module in the Natural Light Illumination System. According to the simulation, the results show the connection efficiency of the multi-stage series still has 66% at the 5th stage, and new design can effectively raise the tolerance angle. The new design which via Natural Light Illumination System still maintain 76% efficient. It's raised 27% up than the previously coupler.
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