【摘要】：模擬光鏈路具有低噪聲、低損耗、高帶寬和大動(dòng)態(tài)范圍等優(yōu)勢,已成為當(dāng)前微波光子領(lǐng)域研究的熱點(diǎn),并在民用通信、雷達(dá)、電子對抗、射電天文和航空航天等領(lǐng)域具有重要的應(yīng)用價(jià)值。論文針對模擬光鏈路信號傳輸與探測過程中傳輸距離、傳輸帶寬和動(dòng)態(tài)范圍受限等問題開展了深入的研究,提出了有效的解決方案,實(shí)現(xiàn)了微波信號長距離、寬帶和大動(dòng)態(tài)范圍的光纖傳輸與感知,論文主要的創(chuàng)新工作如下： 1.針對光纖鏈路色度色散引起信號的周期性功率衰落、從而導(dǎo)致傳輸距離受限的問題,論文提出了一種基于并行強(qiáng)度與相位調(diào)制器的信號調(diào)制技術(shù)。通過利用兩種調(diào)制格式信號的互補(bǔ)頻率響應(yīng),使得接收射頻信號的功率具有頻率不敏感特性,從而功率的衰落得到補(bǔ)償。實(shí)驗(yàn)實(shí)現(xiàn)了0-18GHz頻率范圍射頻信號34km長距離光纖傳輸,系統(tǒng)頻率響應(yīng)平坦,功率抖動(dòng)小于3dB,滿足光載寬帶射頻信號的長距離傳輸?shù)囊蟆?2.針對超寬帶模擬光鏈路多倍頻程受限的問題,論文提出了一種基于雙輸出馬赫增德爾調(diào)制器與偏振復(fù)用的二階諧波失真抑制技術(shù)。實(shí)驗(yàn)實(shí)現(xiàn)了35.8dB的二階諧波失真抑制,同時(shí)二階無雜散動(dòng)態(tài)范圍(SFDR2)提升了約18dB。該方法消除了寬頻帶射頻光傳輸過程中高頻成分受到的諧波失真干擾,從而能夠?qū)崿F(xiàn)寬帶射頻信號的正確解調(diào)。 3.針對模擬光鏈路非線性失真導(dǎo)致的SFDR受限問題,論文分別從全光失真預(yù)補(bǔ)償及數(shù)字失真后補(bǔ)償兩方面開展了非線性失真抑制與動(dòng)態(tài)范圍提升的研究工作。 (1)論文提出了一種基于載波帶處理的全光預(yù)失真方法。該方法通過對載波帶相位進(jìn)行獨(dú)立的控制,使得三個(gè)主要來源下的三階交調(diào)失真(IMD3)分量相互抵消,達(dá)到了IMD3抑制的目的。實(shí)驗(yàn)實(shí)現(xiàn)了高達(dá)34dB的失真抑制。該方法適于高頻信號的線性解調(diào),且結(jié)構(gòu)簡單,易于實(shí)現(xiàn),大大降低了對接收機(jī)及后續(xù)處理的要求。 (2)在數(shù)字失真后補(bǔ)償技術(shù)研究方面,論文結(jié)合低偏置技術(shù)的優(yōu)勢,提出了一種基于調(diào)制器工作點(diǎn)以及基帶信息提取的數(shù)字信號處理(DSP)線性化方法。該方法克服了傳統(tǒng)數(shù)字處理技術(shù)需精確獲知系統(tǒng)傳遞函數(shù)的不足,從而使得數(shù)字失真補(bǔ)償算法更加靈活。同時(shí)該技術(shù)適用于超寬帶多射頻載波模擬光鏈路中載波間互調(diào)失真與交調(diào)失真的共同抑制。 在此基礎(chǔ)上,論文實(shí)現(xiàn)了模擬光鏈路中調(diào)制非線性失真以及前置、后置放大器失真的綜合DSP補(bǔ)償。既充分利用了微波輔助器件改善模擬光鏈路增益及噪聲系數(shù)的優(yōu)勢,又消除了在動(dòng)態(tài)范圍提升方面所帶來的瓶頸,從而實(shí)現(xiàn)模擬光鏈路中多個(gè)特征參數(shù)共同優(yōu)化。系統(tǒng)實(shí)現(xiàn)了27.5dB增益,8.9dB噪聲指數(shù)以及128.3dB@1Hz無雜散動(dòng)態(tài)范圍的高性能模擬光傳輸。相比國際公開報(bào)導(dǎo)指標(biāo),采用該技術(shù)獲得的性能參數(shù)已達(dá)到國際先進(jìn)水平。
[Abstract]:Analog optical link has the advantages of low noise, low loss, high bandwidth and large dynamic range. It has become a hot spot in the field of microwave photons, and has been used in civil communication, radar, electronic countermeasures, etc. Radio astronomy, aerospace and other fields have important application value. In this paper, the transmission distance, bandwidth and dynamic range of analog optical link signal transmission and detection are deeply studied, and an effective solution is put forward to realize the long distance of microwave signal. Broadband and large dynamic range of optical fiber transmission and perception, the main innovative work of the paper as follows: 1. Aiming at the problem of periodic power fading caused by chrominance dispersion in optical fiber link and the limitation of transmission distance, a signal modulation technique based on parallel intensity and phase modulator is proposed in this paper. By using the complementary frequency response of the two modulation formats, the power of the received RF signal is frequency insensitive and the power fading is compensated. The 0-18GHz frequency range RF signal 34km long distance optical fiber transmission is realized experimentally. The system frequency response is flat and the power jitter is less than 3 dB, which meets the requirements of optical broadband radio frequency signal long distance transmission. 2. In order to solve the problem of multi-octave path limitation in UWB analog optical links, a second-order harmonic distortion suppression technique based on dual-output Mahzhendel modulator and polarization multiplexing is proposed in this paper. The second order harmonic distortion suppression of 35.8dB is realized experimentally, and the second order spurious dynamic range (SFDR2) is improved by about 18 dB. The method eliminates the harmonic distortion interference of the high frequency component in the wide band RF optical transmission process, and can realize the correct demodulation of the broadband radio frequency signal. Aiming at the problem of SFDR limitation caused by nonlinear distortion in analog optical link, In this paper, nonlinear distortion suppression and dynamic range enhancement are studied from two aspects: all-optical distortion precompensation and digital distortion post-compensation. (1) an all-optical pre-distortion method based on carrier band processing is proposed in this paper. By independent control of the carrier band phase, the third order Intermodulation distortion (IMD3) components of the three main sources can cancel each other, thus achieving the purpose of IMD3 suppression. The distortion suppression up to 34dB is realized experimentally. This method is suitable for linear demodulation of high frequency signals, and its structure is simple and easy to realize, which greatly reduces the requirements for receiver and subsequent processing. (2) in the research of digital distortion compensation technology, this paper combines the advantages of low bias technology. A linearization method of digital signal processing (DSP) based on modulator operating point and baseband information extraction is proposed. This method overcomes the shortcoming that traditional digital processing technology needs to accurately know the system transfer function, which makes the digital distortion compensation algorithm more flexible. At the same time, this technique is suitable for the suppression of intercarrier Intermodulation distortion and Intermodulation distortion in UWB multi-RF carrier analog optical link. On this basis, the thesis realizes the synthesis DSP compensation of modulation nonlinear distortion and pre- and post-amplifier distortion in analog optical link. It not only makes full use of the advantages of microwave auxiliary device to improve the gain and noise coefficient of analog optical link, but also eliminates the bottleneck caused by dynamic range lifting, thus realizing the common optimization of many characteristic parameters in analog optical link. The high performance analog optical transmission with 27.5dB gain of 8.9 dB noise index and 128.3dB@1Hz with no spurious dynamic range is realized. Compared with the international public reporting index, the performance parameters obtained by this technology have reached the international advanced level.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN929.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 曹培炎;RoF技術(shù)在無線接入網(wǎng)絡(luò)中的應(yīng)用[J];光通信技術(shù);2005年10期

2 吳大偉;;相控陣天線技術(shù)[J];電子技術(shù);1981年12期

3 徐飛;張冠杰;陳矛;;基于FPGA的一種電子戰(zhàn)接收機(jī)信道化設(shè)計(jì)[J];火控雷達(dá)技術(shù);2008年01期

，

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