本論文探討以低成本的光網路架構設計雙向共線傳輸網路，實現數位電視廣播訊號在收視不良區域之光纖傳輸應用，並試驗背接、1公里單模光纖、4公里單模光纖、1公里多模光纖的傳輸，最後改變垂直共振腔面射型雷射的環境溫度，並進行上下行訊號效能量測。
論文中，首先簡介目前台灣數位電視廣播的標準與發展概況，接著分析不同光源之特性，包含分散式回饋雷射、垂直共振腔面射型雷射、法布里-比洛雷射等，並且比較低成本光接收器與商用光接收器之特性，也討論了改善低成本光接收器電磁干擾之方法。
文中探討同時傳輸上下行訊號時，下行訊號對上行訊號品質之影響，分析在不同光纖傳輸下，上下行訊號之特性變化，研究改變下行直接調變訊號之調變深度對電視訊號品質的影響，與改變雷射的環境溫度對本架構之傳輸效能影響。並且上下行訊號傳輸時，下行訊號品質可以維持41%以上，而上行訊號之Q值可以維持在6.7以上，功率償付值約1.6dB，並且實現低成本與不需溫度控制之雙向傳輸網路。

In this thesis, a low-cost optical network structure is studied for bidirectional transmission. It is demonstrated that an optical fiber transmission can improve the DVB-T broadcasting in the poor receiving area. Experimental results are shown of the back to back transmission, the 1-km and 4-km single-mode fiber, and the 1-km multi-mode fiber. A study is also made of the temperature effect on the VCSEL. Measument results on the VCSEL & FP laser diode are shown.
First, the standards and recent development of DVB-T in Taiwan are introduced. Analyses are made on the characteristics of lasers, including a DFB laser, a VCSEL, and a FP laser. Then, a low-cost optical receiver experiment is shown. Methods to reduce the electromagnetic interference in low-cost optical receiver are also discussed.
In this thesis, the effect of the downstream singal on the upstream singal is investigated. The upstream and downstream transmission characteristics are also studied for different kind of fibers. Moreover, the effects of optical modulation depth and the temperature on the transmission performance are also discussed. A low-cost and un-cooled optical network having a downstream singal quality greater than 41%, a upstreanm singal Q greater than 6.7, and a total power penalty of 1.6dB is presented for bidirectional transmission.

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