本論文研究高功率鉺鐿共摻光纖放大器，將其應用在室內無線光通訊系統上，提升傳輸速率與傳輸距離。首先介紹實驗中使用到的鉺鐿共摻光纖、泵激光源以及訊號光源，針對測量的參數作介紹，並使用模擬軟體OptiSystem調製鉺鐿離子的摻雜濃度，使其盡量與實驗用之鉺鐿共摻光纖趨勢擬合。進行單級前向泵激與後向泵激的模擬，當泵激功率提升之後，兩者的增益與雜訊指數會漸趨相近，之後為雙級架構雙前向泵激與雙向泵激的模擬，雙前向泵激架構使用3+5 m的增益光纖，在泵激功率到達2 W時，會達到飽和增益且無殘餘放大自發輻射；雙向泵激部分使用8 m增益光纖，在泵激功率到達2 W時，會有殘餘放大自發輻射，且有飽和增益的情形，此部分為探討增益光纖長度、泵激架構與殘餘放大自發輻射的關係。
而在高功率光纖放大器實作部分，首先找出單級前向泵激架構的最佳長度為2.5 m，在第二級部分加上前向泵激及後向泵激架構，使用2.5+2.7 m增益光纖，訊號光源為波長1550 nm、輸出功率0 dBm的分佈式回饋雷射，泵激光源波長980 nm、驅動電流6 A時，雙前向泵激架構無內建光隔離器可以得到32.42 dB的增益，且雜訊指數在5.7 dB；雙向泵激架構內建光隔離器的增益為30.73 dB，雜訊指數約在6.3 dB；最後是雙向泵激架構無內建光隔離器，得到的增益表現較差為29.93 dB，雜訊指數為在6.5 dB以上。
最後將高功率光纖放大器應用於室內視線型無線光通訊系統上，實際傳輸8.5 Gbps的資料，高功率光纖放大器放置在發射端，使功率提升25 dB以補償傳輸與光分歧損耗，且對此架構進行準直誤差實驗，並分析不同的光纖放大器驅動電流對誤碼率及眼圖的影響，在準直且無干擾情況下，誤碼率可達到10-10左右，若驅動電流提高則能使眼圖更為清晰。

The aim of this thesis is to develop high-power Er/Yb co-doped fiber amplifier and applied it to indoor optical wireless communication to enhance the transmission data rate and extend the receiving area for easy capture the signal. Firstly, the Er/Yb co-doped fiber, pump laser diode(LD), signal source and other related components and devices were introduced. By using the simulation software OptiSystem, the concentration of Erbium ions and Ytterbium ions were simulated based on similar values of the Er/Yb co-doped fiber used in the experiment. Secondly, one-stage forward and backward pump fiber amplifiers were simulated. As the pump power increased, the gain and noise figure(NF) values for both configurations go closer. After then, two-stage forward pump and bidirectional pump were simulated. The lengths of gain fibers used in two-stage forward pump and bidirectional pump fiber amplifiers were 3+5 m and 8 m, respectively. When the pump power was set up to 2W, both of the configurations were gain saturated, but the bidirectional pump configuration still has residual amplified spontaneous emission (ASE). The relation among gain fiber length, pump configuration and residual ASE power were discussed in the thesis.
For high-power fiber amplifier experiment, the optimum gain fiber length of one-stage forward pump configuration is 2.5 m. The gain fiber length is 2.7 m for the second stage, either in forward and backward pump configurations. The signal source is a distributed feedback laser(DFB) laser at 1550 nm and the pump LD at 980 nm were used. Under the condition of 0 dBm for signal power and 6 A driving current for the pump LD, the gain and NF of double-forward pump configuration without optical isolator were 32.42 dB and 5.7 dB, respectively; the gain and NF of bidirectional pump with optical isolator were 30.73 dB and 6.3 dB, respectively; while the gain and NF of bidirectional pump without optical isolator were 29.93 dB and 8.59 dB, respectively.
Finally, the high-power fiber amplifier was applied to indoor optical wireless communications as a boost amplifier. Under the data rate of 8.5 Gbps, the output power was set 25 dB to compensate both the splitting and transmission loss. The effects of driving current on the bit-error-rate and eye diagrams were also measured and discussed. As the transmitter and receiver were well-collimated, the bit-error-rate was as good as 10-10. 

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