【摘要】：無線通信的可移動(dòng)性使得用戶之間可以隨時(shí)隨地進(jìn)行通信,而光纖通信的發(fā)展很好的解決了無線通信中帶寬受限的問題,兩者的結(jié)合促進(jìn)了光載射頻技術(shù)的發(fā)展,從未來通信系統(tǒng)的發(fā)展方向來看,集無線通信和光纖通信優(yōu)勢為一體的光載射頻技術(shù)正在得到愈加廣泛的應(yīng)用。基于光學(xué)的方法實(shí)現(xiàn)的微波信號變頻技術(shù)帶寬大、動(dòng)態(tài)范圍高、系統(tǒng)體積重量小,可實(shí)現(xiàn)各頻段之間一次性的變頻,如Ka波段微波信號可通過一個(gè)微波光子混頻器一次性下變頻到中頻信號,解決了傳統(tǒng)電域變頻系統(tǒng)中面臨的帶寬受限、損耗過大等電子瓶頸,因此成為光載射頻系統(tǒng)中的重要研究方向。本文在給出光載射頻技術(shù)概念的基礎(chǔ)上,強(qiáng)調(diào)了頻率變化技術(shù)對于光載射頻系統(tǒng)的重要性。然后介紹了光載射頻系統(tǒng)的基本原理以及影響鏈路性能的各個(gè)因素,并對微波光子頻率變換鏈路的基本實(shí)現(xiàn)方案進(jìn)行了理論與仿真分析。最后從提高微波光子變頻鏈路性能這一目的出發(fā),針對光纖鏈路中的功率周期性衰落和非線性失真等問題,實(shí)驗(yàn)論證了基于Sagnac環(huán)的功率衰落補(bǔ)償方案和基于直調(diào)激光器與DPMZM級聯(lián)的變頻方案�；赟agnac環(huán)的功率衰落補(bǔ)償方案在對功率進(jìn)行補(bǔ)償?shù)耐瑫r(shí),能進(jìn)一步提高鏈路的動(dòng)態(tài)范圍;而基于直調(diào)激光器和DPMZM級聯(lián)的變頻方案是以DPMZM和MZM級聯(lián)的方案的思想為基礎(chǔ),其目的是簡化鏈路結(jié)構(gòu),節(jié)約系統(tǒng)成本。最終結(jié)果表明基于直調(diào)激光器和DPMZM級聯(lián)的變頻方案在頻率變換的同時(shí),也實(shí)現(xiàn)了鏈路的線性優(yōu)化,明顯提高了鏈路的動(dòng)態(tài)范圍。
[Abstract]:The mobility of wireless communication makes it possible for users to communicate anytime and anywhere. The development of optical fiber communication solves the problem of bandwidth limitation in wireless communication. The combination of the two technologies promotes the development of optical radio frequency technology. From the perspective of the future communication system, the optical radio frequency (RF) technology, which integrates the advantages of wireless communication and optical fiber communication, is becoming more and more widely used. The microwave signal frequency conversion technology based on the optical method has large bandwidth, high dynamic range, small system volume and weight, and can realize one-off frequency conversion among different frequency bands. For example, Ka-band microwave signal can be down-converted to intermediate frequency signal by a microwave photonic mixer at one time, which solves the electronic bottleneck of traditional electric domain frequency conversion system, such as limited bandwidth, excessive loss and so on. Therefore, it has become an important research direction in optical RF systems. Based on the concept of optical radio frequency technology, the importance of frequency change technology for optical radio frequency system is emphasized in this paper. Then the basic principle of the optical RF system and the factors affecting the link performance are introduced, and the basic realization scheme of the microwave photonic frequency conversion link is analyzed in theory and simulation. Finally, in order to improve the performance of microwave photonic frequency conversion link, aiming at the power periodic fading and nonlinear distortion in optical fiber link, The scheme of power fading compensation based on Sagnac loop and the scheme of frequency conversion based on the concatenation of direct-modulated laser and DPMZM are demonstrated experimentally. The power fading compensation scheme based on Sagnac loop can further improve the dynamic range of the link while compensating the power, while the frequency conversion scheme based on the direct modulation laser and the DPMZM cascade is based on the idea of DPMZM and MZM cascade scheme. The aim is to simplify the link structure and save the system cost. The results show that the frequency conversion scheme based on the direct-tuning laser and DPMZM cascade achieves the linear optimization of the link, which obviously improves the dynamic range of the link.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.11

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相關(guān)期刊論文 前1條

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