【摘要】：為了優(yōu)化微波光子下變頻的無雜散動態(tài)范圍,結合帶反饋控制的強度調(diào)制器和相位調(diào)制器,提出并驗證了基于強度和相位級聯(lián)調(diào)制的微波光子下變頻方法。通過理論推導和仿真分析了下變頻原理以及本振功率對系統(tǒng)性能的影響,搭建了強度-相位級聯(lián)調(diào)制的微波光子下變頻系統(tǒng),利用自行研制的直流偏置反饋控制模塊確保強度調(diào)制器的工作狀態(tài)穩(wěn)定,對系統(tǒng)進行了性能測試。實驗結果表明,增益和無雜散動態(tài)范圍分別為-6.65dB和108.62dB/Hz~(2/3),與傳統(tǒng)的強度調(diào)制器級聯(lián)下變頻鏈路相比,增益和無雜散動態(tài)范圍分別提高了3.56dB和19.87dB。基于強度和相位級聯(lián)調(diào)制的下變頻方法僅需要單個偏置電壓,且可通過反饋模塊實現(xiàn)工作狀態(tài)的穩(wěn)定控制,系統(tǒng)結構簡單、性能穩(wěn)定,可實現(xiàn)大動態(tài)范圍的微波光子下變頻。
[Abstract]:In order to optimize the spurious dynamic range of microwave photon down-conversion, a microwave photon down-conversion method based on intensity and phase cascade modulation is proposed and verified by combining the intensity modulator and phase modulator with feedback control. The principle of down-conversion and the influence of local vibration power on system performance are analyzed by theoretical derivation and simulation, and a microwave photon down-conversion system with intensity-phase cascade modulation is built. The self-developed DC bias feedback control module is used to ensure the stability of the intensity modulator, and the performance of the system is tested. The experimental results show that the gain and spurious-free dynamic range are-6.65dB and 108.62 dB-Hz ~ (2), respectively, compared with the traditional down-converter link of the intensity modulator, and the gain-gain and the spurious-free dynamic range are 108.62 dB and 108.62 dB, respectively. The gain and spurious free dynamic range are increased by 3.56dB and 19.87dB, respectively. The down conversion method based on intensity and phase cascade modulation only needs a single bias voltage, and can realize stable control of working state through feedback module. The system has simple structure and stable performance, and can realize microwave photon down conversion in a large dynamic range.
【作者單位】： 北京工業(yè)大學應用數(shù)理學院;北京市精密測控技術與儀器工程技術研究中心;電子信息控制重點實驗室;
【基金】：國家自然科學基金資助項目(No.61372061) 北京市青年拔尖創(chuàng)新人才資助項目(No.CIT&TCD201504020) 日新人才和中央支持地方專項配套項目
【分類號】：TN925

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