本論文主要是將無線光通訊應用於室內短距離傳輸及室內氣體感測。本論文在室內短距離通訊傳輸實驗使用雷射作為傳輸光源，傳輸速率可達到10 Gbit/s，可提供室內個人電腦、電視、音響等裝置作高速光纖接取網路的應用。為了提升無線光通訊的收光效率，本論文結合單模光纖與多模光纖做設計及應用，在發射端使用單模光纖來傳輸訊號，而在接收端則使用多模光纖來耦光，降低耦光的難度。並針對實驗架構作傳輸品質的量測，分別量測傳輸距離在1、1.5、2及2.5公尺時的對光損耗及誤碼率，其量測結果在傳輸距離為1公尺時的對光損耗為0.2 dB，傳輸距離增加到2.5公尺時其對光損耗僅增加0.06 dB為0.26 dB；在誤碼率為10^-9的標準下，在傳輸距離為1公尺時的功率償付值為0.08 dB，傳輸距離增加到2.5公尺時的功率償付值增加0.12 dB為0.2 dB，最後將實驗架構用於室內影像訊號傳輸並成功接收。而室內氣體感測是利用不同氣體會吸收傳輸光源中不同波長的功率的特性，來感測氣體。本實驗使用C+L band的寬頻光源作為傳輸光源來感測氨氣，光源頻帶範圍為1520 nm到1610 nm，其中涵蓋氨氣的吸收頻譜1520 nm到1562 nm，並在接收端使用光頻譜分析儀來觀測吸收光譜的變化。在波長1531.13 nm時，感測氨氣濃度的靈敏度為0.0016 mW/ppm，線性度為0.9881。最後對實驗架構進行穩定度測試，量測結果其最大功率變動量為0.81 dB，平均功率變動量為0.4 dB。

The themes of the thesis were to study indoor optical wireless for communication and gas sensing applications. For communication issue, a laser was modulated to transmit a data rate up to 10 Gbit/s for optical access networks in personal computer, TV and/or audio transmission. In order to enhance the power receiving efficiency in optical wireless, hybrid single-mode fiber (SMF) and multimode fiber (MMF) scheme are used to design the optical wireless system. The SMF acted a laser pigtail to transmit signal to free space while the MMF locates before the receiver to reduce the coupling loss from free space. For performance analysis, the alignment loss and bit error rate were measured in various link distances of 1, 1.5, 2, and 2.5 meters, respectively. The alignment loss for the link distances of 1 meter and 2.5 meters are 0.2 dB and 0.26 dB, respectively. Besides, the 10Gbit/s power penalty are 0.08 dB and 0.2 dB for 1 meter and 2.5 meters, respectively, when compare to back-to-back transmission. Another theme of this thesis was to investigate gas sensing for indoor. By selecting a broadband light source which emission spectrum partially overlapping with the absorption spectrum with gas under test. In our example, a C+L band light source operating in the wavelength range of 1535 nm to 1605 nm was used to monitor Ammonia (NH3). The sensitivity induced loss for NH3 concentration is 0.0016 mW/ppm at 1531.13 nm. For stable analysis, the output power at 1537.53 nm was measured for 5 minutes with 30 sec interval for each step. The average power fluctuation was 0.4 dB, mainly caused by that old broadband light source.

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