本文選題：相干探測 + 平衡探測器��； 參考：《中國科學院大學(中國科學院光電技術研究所)》2017年碩士論文

【摘要】：相干光通信由于其靈敏度較高,傳輸距離長等優(yōu)點廣泛應用于星地通信中。為了實現對微弱信號的探測,在無法協調激光器的發(fā)射功率與信號接收質量的情況下,需要對探測器的接收靈敏度提出很高的要求。平衡探測方式比其他探測方式具有更高的探測靈敏度與信噪比,甚至接近量子極限。在星地激光通信中,由于通信距離較遠,信號光在傳輸時受到大氣信道的二次調制,使得接收機端接收到的信號通常極其微弱。這就對接收機端的對準精度和探測靈敏度提出了很高的要求[1],接收機端的光軸對準是實現星地通信的關鍵。怎樣利用信號光來完成光軸角偏差精密檢測是一個關鍵問題。本文針對此問題開展研究,并與實際需求結合緊密,具有重要的應用價值。本文提出在微弱信號光情況下,運用平衡探測器對光軸偏差角度進行檢測,并將誤差信號通過反饋電路調整快反鏡的角度進行矯正,實現精跟蹤的目的,通過理論分析證明該技術方案合理可行。文章對平衡探測器的工作原理、以及應用它進行光軸偏差檢測的原理,進行了詳細說明;并搭建隔離度光學實驗系統進行驗證、核對實驗結果進行誤差分析;最后對影響平衡探測器性能的因素進行了分析,通過MATLAB仿真給出了不同帶寬條件下信噪比與響應一致性系數之間的關系;仿真結果證明與單端探測相比確實能夠提高信噪比,抑制本振光的強度噪聲。這些工作對相干光通信光學終端系統的設計具有一定的參考價值。
[Abstract]:Coherent optical communication is widely used in satellite-ground communication due to its high sensitivity and long transmission distance. In order to detect the weak signal, the sensitivity of the detector must be very high when the laser's transmitting power and the signal receiving quality can not be coordinated. The balanced detection method has higher detection sensitivity and signal-to-noise ratio than other detection methods, and even approaches the quantum limit. In satellite-to-ground laser communication, because of the long distance, the signal light is modulated by the atmospheric channel in the transmission, so the signal received by the receiver is usually very weak. Therefore, the alignment accuracy and detection sensitivity of the receiver are very high [1], and the optical axis alignment at the receiver is the key to the realization of satellite-ground communication. How to use signal light to complete the precision detection of optical axis angle deviation is a key problem. This paper aims at this problem, and it is closely combined with the actual demand, which has important application value. In this paper, in the case of weak signal light, the balance detector is used to detect the deviation angle of the optical axis, and the error signal is corrected by adjusting the angle of the fast mirror through the feedback circuit to achieve the purpose of fine tracking. Theoretical analysis shows that the technical scheme is reasonable and feasible. In this paper, the working principle of the balance detector and the principle of using it to detect the optical axis deviation are explained in detail, and the isolation optical experimental system is set up to verify and verify the experimental results for error analysis. Finally, the factors affecting the performance of the balanced detector are analyzed, and the relationship between SNR and response consistency coefficient under different bandwidth conditions is given by MATLAB simulation, and the simulation results show that the SNR can be improved in comparison with single-ended detection. Suppress the intensity and noise of the local oscillator. These works have certain reference value for the design of optical terminal system of coherent optical communication.
【學位授予單位】：中國科學院大學(中國科學院光電技術研究所)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1

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