本文選題：雙平衡外差探測 + 噪聲抑制�。� 參考：《北京理工大學(xué)》2015年碩士論文

【摘要】：風(fēng)速測量是氣候?qū)W的重要項目之一,提高風(fēng)速測量的精度,對火箭發(fā)射、飛機的起飛和著陸,以及軍事裝備應(yīng)用等方面都具有重要的意義。雙平衡外差探測系統(tǒng)是在平衡探測系統(tǒng)的技術(shù)基礎(chǔ)上,具有穩(wěn)定的環(huán)境適應(yīng)能力和優(yōu)良的信噪比表現(xiàn),同時可實現(xiàn)信號光的強度、頻率、相位、偏振的高精度解調(diào),在相干激光雷達(dá)、相干光通信、外差干涉領(lǐng)域具有廣泛應(yīng)用價值。雙平衡外差探測系統(tǒng)的研制,對于提高2μm相干測風(fēng)激光雷達(dá)的探測靈敏度具有重要意義。本文的主要工作有:1.對雙平衡外差探測系統(tǒng)進行了原理介紹,使用矩陣光學(xué)的方法建立了雙平衡外差探測器的數(shù)學(xué)模型,推導(dǎo)了雙平衡相干探測系統(tǒng)的信噪比公式,通過數(shù)值仿真對平衡外差探測與一般相干探測進行比較,從理論上證明了雙平衡外差探測系統(tǒng)在消除本振相對強度噪聲、提高信噪比上的優(yōu)越性。2.使用OptiSystem光通信仿真軟件搭建了雙平衡探測系統(tǒng)模型,代入實際器件的參數(shù)進行仿真試驗,仿真驗證了雙平衡探測系統(tǒng)在解調(diào)信號光振幅、頻率、相位和偏振度的可行性。3.分析了實際情況下造成平衡探測器兩支路電流不等的成因,數(shù)值模擬了調(diào)節(jié)支路中的衰減系數(shù)對信噪比的影響,通過OptiSystem仿提出并確定了優(yōu)化方案和最優(yōu)化參數(shù)。4.從準(zhǔn)直失配角和光程差不等兩個角度,分析了雙平衡外差探測系統(tǒng)中的空間失配問題,得出了雙平衡探測系統(tǒng)雖然對光程差的偏差不敏感,但對準(zhǔn)直失配角十分敏感的結(jié)論,從原理上指出了系統(tǒng)零件加工工藝和組裝精度的重要性。5.在原有雙平衡外差探測結(jié)構(gòu)的基礎(chǔ)上,提出了新型光纖式雙平衡外差探測結(jié)構(gòu)圖,并使用OptiSystem仿真軟件進行了系統(tǒng)搭建和仿真,仿真驗證了新型光纖式雙平衡外差探測結(jié)構(gòu)的可行性。結(jié)合市場調(diào)研,介紹了適用于本研究的新型特種光纖器件,為光纖式雙平衡外差探測奠定了基礎(chǔ)。
[Abstract]:Wind speed measurement is one of the important climatology items. Improving the accuracy of wind speed measurement is of great significance to rocket launch, aircraft take-off and landing, and military equipment application. The dual balance heterodyne detection system is based on the technology of balance detection system, and has a stable environment adaptability and good signal to noise ratio. It can realize the high precision demodulation of the intensity, frequency, phase and polarization of the signal light. It has wide application value in the field of coherent laser radar, coherent optical communication and heterodyne interference. The development of the dual balance heterodyne detection system is of great significance for improving the detection sensitivity of the 2 m coherent wind lidar. The main work of this paper is 1.: the principle of double balance heterodyne detection system is introduced. A mathematical model of double balance heterodyne detector is established by using matrix optics, and the signal-to-noise ratio formula of the dual equilibrium coherent detection system is derived. Through numerical simulation, the equilibrium heterodyne detection is compared with the general coherent detection, and the double equilibrium heterodyne detection is proved theoretically. The measurement system can eliminate the relative intensity noise of the local oscillator and improve the superiority of the signal to noise ratio..2. uses the OptiSystem optical communication simulation software to build a dual balance detection system model and substituting the parameters of the actual device to carry out the simulation test. The simulation verifies the feasibility of the dual equilibrium detection system to demodulate the amplitude, frequency, phase and degree of polarization of the signal..3. The cause of the difference in the current of two branches of the balance detector is analyzed. The influence of the attenuation coefficient on the signal to noise ratio is numerically simulated. The optimization scheme and the optimization parameter.4. are proposed and determined by OptiSystem imitation, and the dual balance heterodyne detection system is analyzed by the two angles of the collimation and light path difference. In the problem of space mismatch, it is concluded that the dual equilibrium detection system is not sensitive to the deviation of the optical path difference, but it is very sensitive to the straight mismatch angle. The importance of the processing technology and assembly precision of the system parts is pointed out in principle.5.. On the basis of the original dual balance heterodyne detection structure, a new type of optical fiber type double balance heterodyne is put forward. The structure and Simulation of the system are built and simulated with OptiSystem simulation software. The feasibility of the new optical fiber type double balance heterodyne detection structure is verified by simulation, and a new special fiber device suitable for this study is introduced with the market research. It lays the foundation for the detection of optical fiber type double balance heterodyne.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P412.2;TN958.98

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本文編號：1932234