發(fā)布時(shí)間：2018-05-09 15:18

  本文選題：微波光子濾波器 + 可重構(gòu)性��； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：隨著微波通信技術(shù)的發(fā)展，對于微波信號的高頻傳輸和寬帶通信的需求越來越高。由于電子技術(shù)的限制，傳統(tǒng)的微波濾波電路結(jié)構(gòu)復(fù)雜，價(jià)格昂貴。微波光子濾波器是微波技術(shù)和光學(xué)技術(shù)結(jié)合的產(chǎn)物，可以將微波信號加載到光域中進(jìn)行光學(xué)處理，最后通過光電探測器轉(zhuǎn)換到電域中形成微波。微波光子濾波器的優(yōu)點(diǎn)有濾波頻段高，寬帶寬，體積小，抗電磁干擾，易于接入光纖，可以實(shí)現(xiàn)一些電子微波濾波器所不能實(shí)現(xiàn)的功能。 本文提出一種基于光學(xué)頻率梳和受激布里淵散射的微波光子濾波器，該微波光子濾波器具有可重構(gòu)的單通帶，且通帶可大范圍穩(wěn)定地調(diào)諧。具體內(nèi)容如下： 首先，理論分析基于光學(xué)頻率梳和受激布里淵散射的微波光子濾波器的數(shù)學(xué)模型，，研究了頻率梳和布里淵增益譜的特征，推導(dǎo)了頻率梳的布里淵放大傳遞函數(shù)，提出了通過增加頻率梳條數(shù)和頻率間隔展寬微波光子濾波器通帶的方法。 其次，搭建了基于光學(xué)頻率梳和受激布里淵散射的微波光子濾波器，測量了頻率梳光譜、布里淵增益譜和微波光子濾波器通帶，驗(yàn)證了微波光子濾波器通帶的可重構(gòu)性。研究了微波光子濾波器的可調(diào)諧性，包括調(diào)諧范圍、形狀因子和帶外抑制能力等因素。討論了微波光子濾波器通帶的特征，包括頂部波動(dòng)、幅值階梯下降、底部突起等現(xiàn)象，研究了高階邊帶、泵浦光功率和矢量網(wǎng)絡(luò)分析儀輸出功率等影響微波光子濾波器帶外抑制能力的因素。 最后，實(shí)驗(yàn)結(jié)果顯示，基于頻率梳和受激布里淵散射微波光子濾波器的3-dB帶寬實(shí)現(xiàn)了從34.5MHz到306.8MHz之間的重構(gòu)，通帶調(diào)諧范圍為3GHz到20GHz，帶外抑制能力可達(dá)到40dB。
[Abstract]:With the development of microwave communication technology, the demand for high frequency transmission and broadband communication of microwave signal is increasing. Due to the limitation of electronic technology, the structure of traditional microwave filter circuit is complex and expensive. Microwave photonic filter is a combination of microwave technology and optical technology. Microwave signal can be loaded into optical domain for optical processing. The advantages of microwave photonic filter are high frequency band, wide bandwidth, small volume, anti-electromagnetic interference, easy access to optical fiber, and can realize some functions which can not be realized by electronic microwave filter. In this paper, a microwave photonic filter based on optical frequency comb and stimulated Brillouin scattering is proposed. The microwave photonic filter has a reconfigurable single pass band and can be tuned stably in a large range. The details are as follows: Firstly, the mathematical model of microwave photonic filter based on optical frequency comb and stimulated Brillouin scattering is analyzed theoretically, the characteristics of frequency comb and Brillouin gain spectrum are studied, and the Brillouin amplification transfer function of frequency comb is deduced. A method to widen the pass band of microwave photonic filter by increasing the number of comb and frequency interval is presented. Secondly, a microwave photonic filter based on optical frequency comb and stimulated Brillouin scattering is built. The spectrum of frequency comb, Brillouin gain spectrum and pass band of microwave photonic filter are measured, and the reconfiguration of pass band of microwave photonic filter is verified. The tunability of microwave photonic filter is studied, including tuning range, shape factor and outband suppression ability. The characteristics of the pass band of microwave photonic filter are discussed, including the top wave, the drop of the amplitude step, the bottom protuberance, and the high order sideband. The pump power and the output power of the vector network analyzer affect the off-band suppression ability of microwave photonic filter. Finally, the experimental results show that the 3-dB bandwidth based on the frequency comb and stimulated Brillouin scattering microwave photonic filter can be reconstructed from 34.5MHz to 306.8MHz. The bandpass tuning range is from 3GHz to 20 GHz, and the out-of-band suppression ability can reach 40 dB.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN925;TN713

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本文編號：1866522