為了產生光微波訊號以用於光載微波系統,直接調制或者外部調至是最簡單的方 法,此兩種方式通常會產生出雙邊帶調制訊號,然而因為光纖中的色散,此類型訊號 會使得微波功率隨著傳輸距離或者微波頻率產生劇烈的變化,如此便會嚴重限制基地 台的建構位置,為了克服如此效應,單邊帶調制訊號相對於雙邊帶調制訊號更適合在 光載微波系統中進行傳輸。在本篇論文中,藉由將半導體雷射操縱在穩定鎖住動態使 其共振腔產生紅移,如此便可將雙邊帶調制訊號轉換成單邊帶調制訊號,為了更加了 解注入穩定鎖住動態以利後續訊號處理的應用,其基本特性相對於不同住入條件亦會 進行深入分析。在此研究中所提出的方法,轉換後的單邊帶調制訊號,邊帶強度差可 同時達到 18 dB 的微波頻率從 22.7 GHz 遍及到 42.7 GHz,此 18 dB 的邊帶強度差異 味著在光纖中微波功率的最大變化可從大於 50 dB 減少到 2.2 dB,特別的是因為本篇 論文所提出的轉換方法是藉由將單一邊帶進行放大以代替抑制,因此其訊號本身的調 制深度會隨之增加,使得相同光功率下拍頻後的微波功率放大,連帶改善訊號品質並 且增加無線傳輸距離。其微波放大等相關特性亦在本篇論文中被討論,微波頻率從 12 GHz 到達 40 GHz,甚至超過,可藉由不同住入條件達到同樣 18 dB 的微波增益, 其放大後的微波訊號品質,包含相位雜訊以及半高寬皆可維持與原訊號相同,而寬頻 的增益意味著可轉換的傳輸速率可達到億赫茲等級,因此藉由此轉換方法的確可使得 訊號進行放大並且實際傳輸。

For radio-over-fiber links, optical double-sideband modulation (DSB) signals, which are typically generated by the simplest scheme of direct or external modulations of optical carriers, suffer from the microwave power fading effect due to the chromatic dispersion over optical fibers. To mitigate such the unwanted effect, single-sideband modulation (SSB) signals are preferred. In this thesis, a semiconductor laser at stable locking dynamics is used as a unit to convert DSB signals into SSB signals through the red-shifted cavity resonance. To deeply realize the applied stable locking dynamics for further applications, its characteristics in terms of operation conditions are detailedly investigated as well. With the proposed scheme, DSB signals can be converted into SSB signals with a sideband rejection ratio of up to 18 dB over a broad microwave frequency of 22.7 to 42.7 GHz, which improves the maximum variation in microwave power from as large as 50 dB to 2.2 dB. Particularly, since the SSB feature is achieved by the enhancement of the lower modulation sideband instead of the suppression, the modulation depth increases, leading to the amplification in microwave power under the same optical power at the photodetector. This can improve the detection sensitivity and the transmission distance. The amplification of 18 dB is achieved over a broad microwave frequency from 12 GHz to more than 40 GHz. The phase features of the microwaves, including 3-dB linewidth and phase noise, are mostly preserved. The broad gain bandwidth of the modulation sidebands leads to the feasibility of data transmission in RoF links with the high data rate of the order of gigahertz. Hence, the detection sensitivity of the data after amplification is indeed improved with the amplified microwaves through the proposed scheme.

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