由於智慧手持裝置的應用急速成長，具備寬頻傳輸的無線及行動網路佈建變成相當急迫。當用戶的傳輸頻寬需求持續增加時，包括現有的WiMAX網路服務以及未來4G網路，其無線電訊號在室內容易受到牆壁及室內物品的阻隔，而影響到接收訊號的品質。為有效提高訊號覆蓋率，並提供低成本且彈性的服務，可使用射頻光纖（radio over fiber, RoF）技術，克服室內無線訊號穿透性及覆蓋率不足的問題。本文介紹射頻光纖技術及其應用，並以建置於台灣科技大學的系統，說明如何以低成本的模組，佈建大樓的RoF系統，並展示佈建前後之傳輸效能差異。

The applications and services of broadband wireless networks, including the existing WiMAX and upcoming LTE systems, has been developed and deployed rapidly owing to the needs of large bandwidth and flexible operation. However, the radio signals subject to the blocking by building envelops and may have poor indoor signal quality. To improve the coverage of broadband wireless networks inside buildings, the radio-over-fiber (RoF) technology can be used to enhance the indoor radio signal quality. This article introduces the RoF techniques and their applications. We implement an indoor RoF system with low-cost modules and demonstrate the signal quality enhancement by the technology. The goals are to make the RoF modules to be low cost and easy-installation solutions in the building.