近年來，為了解決能源耗竭、環境破壞問題，可再生能源的相關研究越來越多。其中，太陽能是一種取之不盡，用之不竭的能源，因此有關太陽能的發展備受注意。為了減少能源的消耗及汙染，本實驗室開發一套照明系統，稱為自然光照明系統，有別於一般的太陽能電池需要經過能量轉換，自然光照明系統則是透過幾何光學設計的元件，將太陽光系統化地直接導入至室內空間進行照明，減少了光電轉換過程中的能量損耗，讓太陽光達到最大的使用效率。
自然光照明系統是以光磚模組做為集光器，經過大面積的鋪設來收集足夠的太陽光。我們所採用的光磚模組具有4個出口，並以光纖作為傳光元件進行傳遞，當光磚數量越多，連接的光纖數量也越多，導致在同樣空間下，光磚的鋪設數量也會因此受到限制。為了解決光磚模組出口過多問題，提高在相同空間下光磚模組的鋪設數量，本論文提出了模組化耦合器之設計，將多出口整合為單一出口，並進行光線傳輸。
本論文中提出的耦合器設計，是利用類似積木可拼湊、組合多樣的特性作為本次在結構上的設計概念。本文採用三維的光路設計與全反射式的雙拋物面無焦壓縮，設計出新一代的模組化耦合器。在結構上，比前一代耦合器更小，經過串接6個耦合器進行模擬分析：在理想的平行光源下，其效率相較於前一代耦合器，雖然僅提升了約4%；但在經過實驗室目前有著±2度發散角的準直器的光源後，其效率相較於前一代耦合器的9.18%，提升至74.7%。由模擬結果可得知，本文提出的新一代耦合器在各方面表現皆優於前一代耦合器。

In recent years, in order to solve the problem of energy depletion and environmental damage, more and more researches on renewable energy have been made. In order to reduce energy consumption and pollution, our laboratory developed a Natural Light Illumination System (NLIS) which designed through geometric optics. The sunlight is systematically introduced directly into the indoor space for illumination, which allows the sunlight to reach the maximum use efficiency.
NLIS uses a lightbrick module as a concentrator. The lightbrick module we use has 4 exit ports and transmits the fiber as a light transmission component. As the number of lightbricks increases, the number of connected fibers increases. In order to solve the problem of excessive exit ports of lightbrick modules, this study proposes the design of modular couplers, which integrates multiple exit ports into a single exit port and transmits light.
In this study, a new generation of modular couplers is designed using three-dimensional optical path design and total internal reflection double paraboloid afocal compression. In terms of structure, it is smaller than the previous generation coupler, and is connected to 6 couplers for simulation analysis：In an ideal parallel source, the efficiency is only about 4% higher than that of the previous generation coupler. However, after passing through the light source of the collimator with a ±2 degree divergence angle. The efficiency is increased to 74.7% compared with 9.18% of the previous generation coupler. As a result that the new generation of couplers proposed in this study is superior to the previous generation couplers in all aspects.

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