本文關(guān)鍵詞： 液晶空間光調(diào)制器 波長(zhǎng)選擇開(kāi)關(guān) 純相位調(diào)制 閃耀光柵　出處：《北京交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著密集波分復(fù)用(DWDM)技術(shù)的廣泛應(yīng)用和光纖傳輸容量的巨幅增長(zhǎng),SDH技術(shù)早已不堪重負(fù),以波長(zhǎng)選擇開(kāi)關(guān)(WSS)為基礎(chǔ)的第三代多功能可重構(gòu)光分插復(fù)用器(ROADM)作為實(shí)現(xiàn)下一代動(dòng)態(tài)全光網(wǎng)絡(luò)的關(guān)鍵設(shè)備,在近年來(lái)受到了光通信領(lǐng)域研究機(jī)構(gòu)的高度重視,并得到了快速發(fā)展。而基于液晶空間光調(diào)制器(LC-SLM)的WSS具有波長(zhǎng)無(wú)關(guān)(Colorless,各上下路端口均可重構(gòu)至任意波長(zhǎng))、方向無(wú)關(guān)(Directionless,各上下路端口均可重構(gòu)至任意方向)、無(wú)競(jìng)爭(zhēng)性(Contentionless,可靈活上下路不同方向的同一波長(zhǎng))、高度光譜靈活性等特點(diǎn)成為了現(xiàn)今國(guó)內(nèi)外研究的重點(diǎn)。 本文在對(duì)純相位液晶空間光調(diào)制器衍射特性進(jìn)行理論分析與數(shù)值仿真研究的基礎(chǔ)上,采用簡(jiǎn)潔的光學(xué)系統(tǒng)設(shè)計(jì)研制成功了一種基于液晶的波長(zhǎng)選擇開(kāi)關(guān)實(shí)驗(yàn)原型。具體開(kāi)展的工作如下： (1)簡(jiǎn)要介紹了液晶空間光調(diào)制器的發(fā)展,從液晶材料的電光特性出發(fā),研究了液晶分子對(duì)光波的調(diào)制原理和液晶空間光調(diào)制器的基本結(jié)構(gòu),并利用瓊斯矩陣?yán)碚摲治隽似窆饨?jīng)過(guò)液晶調(diào)制后的偏振態(tài)和光強(qiáng)的改變。 (2)利用標(biāo)量衍射理論建立了液晶空間光調(diào)制器加載閃耀光柵圖像時(shí)衍射效率的分析模型,分別用空間域和頻率域的方法推導(dǎo)出衍射效率的計(jì)算公式,并運(yùn)用MATLAB軟件模擬了衍射光強(qiáng)曲線。 (3)用泰曼一格林干涉裝置來(lái)測(cè)量液晶空間光調(diào)制器的相位調(diào)制特性,通過(guò)MATLAB編程進(jìn)行圖像處理并計(jì)算得到了每個(gè)灰度值對(duì)應(yīng)的相位延遲量,繪制出相位調(diào)制特性曲線。通過(guò)分析計(jì)算,校正了相位調(diào)制特性曲線,提高了液晶的衍射效率。 (4)在理論分析的基礎(chǔ)上,搭建了基于液晶的波長(zhǎng)選擇開(kāi)關(guān)(WSS)實(shí)驗(yàn)平臺(tái),實(shí)現(xiàn)了支持靈活光譜的1×30端口的WSS基本功能。使用JAVA語(yǔ)言為液晶空間光調(diào)制器編寫相應(yīng)的控制軟件,為進(jìn)一步開(kāi)展波長(zhǎng)選擇開(kāi)關(guān)實(shí)驗(yàn)樣機(jī)的研制提供了理論基礎(chǔ)和關(guān)鍵技術(shù)支撐。
[Abstract]:With the wide application of DWDM (dense wavelength Division Multiplexing) technology and the huge increase of fiber transmission capacity, SDH technology has already been overwhelmed. The third generation multifunctional reconfigurable optical add / drop multiplexer (ROADM) based on wavelength selective switch (WSS) is the key device to realize the next generation dynamic all-optical network. In recent years, it has been attached great importance by the research institutions in the field of optical communication. The WSS based on liquid crystal spatial light modulator (LC-SLM) has wavelength independent colorless, and the upper and lower ports can be reconstructed to arbitrary wavelength. Direction has nothing to do with Directionless, each upper and lower ports can be reconstructed to any direction, no competitive Contentionless. The characteristics of flexible upper and lower paths in the same wavelength and high spectral flexibility have become the focus of research both at home and abroad. Based on the theoretical analysis and numerical simulation of the diffraction characteristics of the pure phase liquid crystal spatial light modulator. An experimental prototype of wavelength selective switch based on liquid crystal has been designed and developed by using simple optical system. The detailed work is as follows: 1) the development of liquid crystal spatial light modulator is briefly introduced. Based on the electro-optic characteristics of liquid crystal materials, the principle of liquid crystal molecular modulation of light wave and the basic structure of liquid crystal spatial light modulator are studied. The polarization state and the change of light intensity of polarized light after liquid crystal modulation are analyzed by Jones matrix theory. (2) using scalar diffraction theory, the diffraction efficiency analysis model of liquid crystal spatial light modulator loaded with blazed grating image is established, and the calculation formulas of diffraction efficiency are derived by the methods of spatial domain and frequency domain, respectively. The diffraction intensity curve is simulated by MATLAB software. The phase modulation characteristics of liquid crystal spatial light modulator are measured by using Tymann-Green interferometer, and the phase delay corresponding to each gray value is calculated by MATLAB programming. The phase modulation characteristic curve is drawn, and the phase modulation characteristic curve is corrected through analysis and calculation, which improves the diffraction efficiency of liquid crystal. On the basis of theoretical analysis, an experimental platform of wavelength selective switch (WSS) based on liquid crystal is built. The basic function of 1 脳 30 port WSS supporting flexible spectrum is realized, and the corresponding control software is written in JAVA language for liquid crystal spatial light modulator. It provides the theoretical foundation and key technical support for further developing the experimental prototype of wavelength selective switch.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN761

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