發(fā)布時間：2018-01-24 10:21

  本文關鍵詞： 液晶空間光調制器 波長選擇開關 純相位調制 閃耀光柵　出處：《北京交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著密集波分復用(DWDM)技術的廣泛應用和光纖傳輸容量的巨幅增長,SDH技術早已不堪重負,以波長選擇開關(WSS)為基礎的第三代多功能可重構光分插復用器(ROADM)作為實現下一代動態(tài)全光網絡的關鍵設備,在近年來受到了光通信領域研究機構的高度重視,并得到了快速發(fā)展。而基于液晶空間光調制器(LC-SLM)的WSS具有波長無關(Colorless,各上下路端口均可重構至任意波長)、方向無關(Directionless,各上下路端口均可重構至任意方向)、無競爭性(Contentionless,可靈活上下路不同方向的同一波長)、高度光譜靈活性等特點成為了現今國內外研究的重點。 本文在對純相位液晶空間光調制器衍射特性進行理論分析與數值仿真研究的基礎上,采用簡潔的光學系統(tǒng)設計研制成功了一種基于液晶的波長選擇開關實驗原型。具體開展的工作如下： (1)簡要介紹了液晶空間光調制器的發(fā)展,從液晶材料的電光特性出發(fā),研究了液晶分子對光波的調制原理和液晶空間光調制器的基本結構,并利用瓊斯矩陣理論分析了偏振光經過液晶調制后的偏振態(tài)和光強的改變。 (2)利用標量衍射理論建立了液晶空間光調制器加載閃耀光柵圖像時衍射效率的分析模型,分別用空間域和頻率域的方法推導出衍射效率的計算公式,并運用MATLAB軟件模擬了衍射光強曲線。 (3)用泰曼一格林干涉裝置來測量液晶空間光調制器的相位調制特性,通過MATLAB編程進行圖像處理并計算得到了每個灰度值對應的相位延遲量,繪制出相位調制特性曲線。通過分析計算,校正了相位調制特性曲線,提高了液晶的衍射效率。 (4)在理論分析的基礎上,搭建了基于液晶的波長選擇開關(WSS)實驗平臺,實現了支持靈活光譜的1×30端口的WSS基本功能。使用JAVA語言為液晶空間光調制器編寫相應的控制軟件,為進一步開展波長選擇開關實驗樣機的研制提供了理論基礎和關鍵技術支撐。
[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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN761

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本文編號：1459810