發(fā)布時間：2018-09-07 15:55

【摘要】：隨著光電子器件以及微波通信技術(shù)的快速發(fā)展,形成了光學(xué)和電學(xué)的交叉學(xué)科,即微波光子學(xué)。微波光子技術(shù)具有帶寬高、重量輕、抗電磁干擾以及損耗低等優(yōu)點,對微波信號的發(fā)生、傳輸和處理等方面都有很大的優(yōu)勢,并且被廣泛應(yīng)用于通信、軍事等方面。而微波光子鏈路是微波光子學(xué)的核心技術(shù)。本論文分析了微波光子鏈路的性能參數(shù),為了解決非線性失真帶來的性能缺陷,提出了基于相位調(diào)制的線性化方案。首先通過理論推導(dǎo)分析了微波光子鏈路的幾個關(guān)鍵的性能參數(shù),即增益、噪聲、帶寬和非線性失真等。并且從理論的角度分析了外調(diào)制技術(shù)以及相位調(diào)制技術(shù),為本文提供了理論基礎(chǔ)。其次,提出了兩個將相位調(diào)制轉(zhuǎn)換為強度調(diào)制的方案,即色散法和濾波法�；�于濾波法,將轉(zhuǎn)換技術(shù)應(yīng)用到光下變頻技術(shù),此技術(shù)主要是利用本地振蕩器對光調(diào)制信號二次調(diào)制的方式將微波信號變頻到低頻和中頻信號,從而方便接收部分對微波信號的解調(diào)和處理。最后提出了一個基于相位調(diào)制的消除色散影響的大動態(tài)范圍的微波光子鏈路,本方案利用相位調(diào)制器的兩個偏振軸,將調(diào)制后的光調(diào)制信號分為兩路,分別濾波處理,分別將相位調(diào)制轉(zhuǎn)換為強度調(diào)制,然后將兩路信號合并,通過控制兩路光載波的輸入功率的比例,實現(xiàn)了抑制三階非線性失真,從而提高動態(tài)范圍。并且,濾波后的信號為單邊帶信號,可以消除色散的影響。
[Abstract]:With the rapid development of optoelectronic devices and microwave communication technology, the interdiscipline of optics and electricity, that is microwave photonics, has been formed. Microwave photon technology has many advantages, such as high bandwidth, light weight, anti-electromagnetic interference and low loss. It has great advantages in microwave signal generation, transmission and processing, and has been widely used in communications, military and so on. Microwave photonic link is the core technology of microwave photonics. In this paper, the performance parameters of microwave photonic link are analyzed. In order to solve the performance defect caused by nonlinear distortion, a linearization scheme based on phase modulation is proposed. Firstly, several key performance parameters of microwave photonic link, such as gain, noise, bandwidth and nonlinear distortion, are analyzed theoretically. The external modulation technology and the phase modulation technology are analyzed theoretically, which provides the theoretical basis for this paper. Secondly, two schemes of converting phase modulation into intensity modulation are proposed, namely dispersion method and filtering method. Based on the filtering method, the conversion technique is applied to the optical downconversion technology, which mainly uses the local oscillator to modulate the optical signal twice to convert the microwave signal to the low frequency and intermediate frequency signal. It is convenient for receiving part to demodulate and process microwave signal. Finally, a large dynamic range microwave photonic link based on phase modulation is proposed. Using the two polarization axes of the phase modulator, the modulated optical modulation signal is divided into two channels, which are filtered and processed separately. The phase modulation is converted into intensity modulation, and then the two signals are combined. By controlling the ratio of input power of the two optical carriers, the third-order nonlinear distortion is suppressed and the dynamic range is improved. Moreover, the filtered signal is a single sideband signal, which can eliminate the influence of dispersion.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN015

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本文編號：2228713