由於地球暖化的影響，越來越多人致力於綠能科技的研究，尤其是使用自然光做為室內照明的領域，因此不少文獻中許多的光學元件漸漸的被創造，並且朝著輕薄短小的目標發展，也有著各種不同的應用。
建築照明耗能隨著社會的發展已佔據了台灣總能源耗能之5%以上，並且有逐漸上升之趨勢。自然光不但能創造高品質的光環境，對於健康、情緒，學習效能和工作效率的提升，並滿足人對自然光的生理與心理上的需求，具有效的節約消耗化石能源。然而現今市面上產品大部分皆是使用集光器搭配光纖的方式將光傳輸至所需要的位置上。
自然光照明系統利用三個子系統:集光子系統、傳光子系統以及放光子系統所組成，將光導引至無法自然採光或其他需要照明之場所。然而現今的自然光照明系統中在多個系統的連結方式尚未有一個高效率的耦合裝置，因此針對這個問題提出了一個耦合裝置來改善這個問題，並且使耦合裝置可以以串接的方式來連結，使得在自然光照明系統中的光纖使用數量得以下降，自然光照明系統得以更方便的使用在既有的建築物當中。

Due to the impact of global warming, more and more people are dedicated to researching of green energy technology, especially the field of indoor lighting by using natural light; therefore, a lot of optical elements are created gradually in many literatures, and set the goal of the development toward light and small, so they have a variety of applications.
With the development of society, architectural lighting energy consumption has accounted for more than 5% of Taiwan’s total energy consumption, the trend is rising gradually. Natural light not only create high-quality light environment that improve health, emotion, learning effectiveness and work efficiency, but also satisfy people physical and psychological needs; furthermore, it conserves fossil energy effectively.
However, most of the products on the market transmit the light to the desired position by using the way of collector with optical fiber.
Natural lighting system combines three subsystems: collector subsystems, transmission subsystems and lighting subsystems. Natural lighting system directs the light to the places without natural light and light required. Nowadays, there is not still a high efficiency of coupling device for linking between many systems in the natural light system, so we propose a coupling device to improve the problem we mentioned. The coupling device can be linked by stringing, it will decrease the number of fiber we use in the natural lighting system; therefore, the system can be applied easily in the currently existing buildings.

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