本文選題：微波光子信號處理 + 光真延時�。� 參考：《北京郵電大學》2014年博士論文

【摘要】：寬帶無線接入、傳感器網(wǎng)絡(luò)、雷達系統(tǒng)、電子對抗、衛(wèi)星通信、儀器儀表及天文探測等正向著頻率范圍大、大帶寬、高動態(tài)范圍、地域廣等方向發(fā)展,對毫米波器件的性能提出了新的挑戰(zhàn)。微波光子學是研究微波和光波相互作用規(guī)律及應(yīng)用的一門新興學科。它利用光子學方法產(chǎn)生、分配、控制與處理寬帶毫米波信號,被認為是應(yīng)對上述挑戰(zhàn)的有效途徑,由此引發(fā)的科學問題已經(jīng)成為微波光子學當前的前沿研究方向,其中微波光子信號處理借助光子技術(shù)通過光信號處理實現(xiàn)對毫米波信號的處理,相對于傳統(tǒng)電子器件具有高頻、超寬帶、可調(diào)諧和可重構(gòu)等優(yōu)勢,具有廣闊的應(yīng)用前景。 本文結(jié)合國家重點基礎(chǔ)研究計劃(973計劃)項目(新型寬帶大動態(tài)毫米波器件及應(yīng)用中的微波光子學基礎(chǔ)研究),圍繞微波光子學領(lǐng)域中光子信號處理技術(shù),重點研究光真延時及光子射頻移相技術(shù)。本文的主要研究工作及創(chuàng)新成果如下： (1)光控波束形成網(wǎng)絡(luò)中光真延時(OTTD)技術(shù)的研究。OTTD技術(shù)抗電磁干擾能力強,體積小、重量輕,并能有效抑制波束偏斜,被認為是寬帶相控陣天線的可選技術(shù)之一。在基于可調(diào)諧激光器和色散器件的OTTD研究基礎(chǔ)之上,針對一維模型結(jié)構(gòu)復雜、難以實現(xiàn)大規(guī)模擴展等問題,本文提出了一種二維OTTD波束形成技術(shù)方案,該方案生成的高增益波束可掃描空間的指定方向,有效地降低系統(tǒng)了復雜度及對可調(diào)諧激光源的要求,并適用于相控陣天線的大規(guī)模擴展。 (2)光控波束形成網(wǎng)絡(luò)中的功率均衡與控制的研究。在實際的光控波束形成網(wǎng)絡(luò)中,由于各種光器件的波長響應(yīng)度不一致,如光耦合器對不同波長信號的耦合系數(shù)不一樣、光放大器對不同波長信號的增益不平坦、光濾波器在不同波長處的插入損耗不一致以及其它非線性器件的影響等,都不可避免地引起各路光信號功率差異,尤其是在大規(guī)模的光控相控陣天線中,這種功率差異更為明顯,因此需要考慮均衡或控制每一路光信號的功率,實現(xiàn)各通道間的功率均衡或控制,從而抑制光控波束形成網(wǎng)絡(luò)生成波束的旁瓣,提高其系統(tǒng)性能。本文提出了一種光功率控制的方法,該方法實現(xiàn)了各路光信號功率的均衡和控制,并進行了仿真驗證說明。 (3)光子射頻移相技術(shù)的研究。移相器要求能夠?qū)崿F(xiàn)RF信號相位0～360。連續(xù)可調(diào)并且保持RF信號幅度不變,同時要求調(diào)諧精度高、操作頻帶寬、抗電磁干擾能力強、低損耗、簡單易行。針對以上要求,本文提出了一種基于單邊帶調(diào)制光載波調(diào)相的光子射頻移相技術(shù)方案,該方案利用優(yōu)化后的光纖光柵實現(xiàn)了光載波和一階邊帶的分離,通過對光載波相位的控制實現(xiàn)了RF信號相位0～360。連續(xù)可調(diào),并且RF信號幅度基本不變,可處理RF信號的頻率范圍達到了22～70GHz。 (4)基于光譜處理的光子射頻移相技術(shù)。光譜處理是微波光子信號處理的分析和設(shè)計的一般方法,該方法以頻譜形式表示信號,探索任意信號在不同的電光/光電變換及系統(tǒng)傳輸過程中的頻譜演化規(guī)律,通過對每個光譜分量進行操作來實現(xiàn)RF信號處理功能。本文首次考慮了微波光子鏈路中色散引起的相位噪聲問題,并提出了一種靈活高效、可調(diào)諧、可重構(gòu)的光子射頻移相技術(shù),該技術(shù)方案利用光譜處理同時補償和控制每一個頻譜分量的幅度和相位,構(gòu)造多個光子射頻移相器的同時有效抑制色散引起的相位噪聲。驗證實驗實現(xiàn)了15GHz射頻信號相位0～360。連續(xù)可控,并且相位抖動小于2。,RF信號幅度變化小于2.5dB。
[Abstract]:Broadband wireless access, sensor networks, radar systems, electronic countermeasures, satellite communications, instrumentation and astronomical detection are developing in the direction of large frequency range, large bandwidth, high dynamic range and wide area, and put forward new challenges to the performance of millimeter wave devices. Microwave photonics is a study of the interaction laws and Applications of microwave and light waves. A new subject. It uses photonics to produce, distribute, control and deal with wide-band millimeter wave signals. It is considered an effective way to deal with the above challenges. The scientific problems caused by it have become the current research direction of microwave photonics, in which microwave photon signal processing is realized by light signal processing with the help of photon technology. Compared with traditional electronic devices, millimeter wave signal processing has the advantages of high frequency, ultra wideband, tunable and reconfigurable, and has broad application prospects.
This paper, based on the national key basic research plan (973 Plan) project (new broadband large dynamic millimeter wave devices and microwave photonics basic research), focuses on Photonics signal processing technology in the field of microwave photonics, focusing on optical true delay and photon radio frequency phase shift technique. The main research work and innovation results are as follows:
(1) the study of optical true delay (OTTD) technology in optical beam forming network (.OTTD) technology, it has strong anti electromagnetic interference ability, small volume, light weight, and can effectively suppress beam deflection. It is considered as one of the optional techniques of wideband phased array antenna. Based on the OTTD research based on tunable laser and dispersion device, the structure of one dimension model In this paper, a two-dimensional OTTD beamforming technique is proposed. This scheme generates the specified direction of the high gain beam scanning space, which can effectively reduce the complexity of the system and the requirements for the tunable laser source, and is suitable for the large-scale expansion of the phased array antenna.
(2) the study of power balance and control in the optical beam forming network. In the actual optical control beam forming network, because of the different wavelength responsiveness of various optical devices, such as the coupling coefficient of the optical coupler to different wavelengths, the gain of the optical amplifier to different wavelengths is not flat, and the optical filter is at different wavelengths. The inconsistency of insertion loss and the influence of other nonlinear devices inevitably cause the difference of power of optical signals in all roads, especially in large-scale optical controlled phased array antennas. This power difference is more obvious. Therefore, the power of each optical signal should be balanced or controlled, and the power balance or control between channels can be realized. In order to suppress the optical beamforming network to generate the sidelobe of the beam and improve the performance of the system, a method of optical power control is proposed in this paper. The method realizes the equalization and control of the optical signal power of each path, and the simulation verification is carried out.
(3) research on photon radio frequency phase shift technology. Phase shifter requires that the phase 0 to 360. of RF signal can be adjusted continuously and keep the amplitude of RF signal unchanged, and it requires high tuning precision, wide operation frequency band, strong anti electromagnetic interference ability, low loss, and simple and easy. In this paper, a kind of phase modulation based on single side band modulation is proposed. The scheme of photofrequency phase shift technology, the scheme uses the optimized fiber Bragg grating to separate the optical carrier and the first order side band. Through the control of the phase of the optical carrier, the phase 0 to 360. of the RF signal can be continuously adjustable, and the amplitude of the RF signal is basically unchanged, and the frequency range of the RF signal can be reached to 22 ~ 70GHz.
(4) photofrfic phase shift technology based on spectral processing. Spectral processing is the general method of analysis and design of microwave photon signal processing. The method is used to express the signal in the form of spectrum, exploring the spectrum evolution law of any signal in the process of different electro-optic / photoelectric transformation and system transmission. By operation of each spectral component, the method is practical. The present RF signal processing function. This paper first considers the phase noise caused by dispersion in the microwave photonic link, and proposes a flexible, efficient, tunable and reconfigurable photonic phase shift technique. The scheme uses spectral processing to compensate and control the amplitude and phase of each spectrum component at the same time, and constructs multiple photon radio frequency shifts. The phase noise is effectively suppressed by the phase shifter. The experiment realizes the continuous control of the phase 0 ~ 360. of the 15GHz radio frequency signal, and the phase jitter is less than 2., and the amplitude of the RF signal is less than 2.5dB.

【學位授予單位】：北京郵電大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN911.7

【參考文獻】

相關(guān)期刊論文 前4條

1 馬文英;董瑋;劉彩霞;張歆東;賈翠萍;周敬然;陳維友;;光子射頻移相器研究與進展[J];半導體技術(shù);2007年04期

2 周波;張漢一;鄭小平;陳銳;;微波光子學發(fā)展動態(tài)[J];激光與紅外;2006年02期

3 廖進昆;劉永智;侯文婷;楊亞培;戴基智;陸榮國;高宇;;集成光子學微波移相器研究進展[J];激光與紅外;2007年09期

4 王偉南;鄭小平;周波;張漢一;李艷和;;基于寬譜光源的光控微波延時技術(shù)[J];中國激光;2006年09期

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