寬帶單模單偏振光纖的研究

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摘要 本文提出了一種基于高雙折射的新型帶寬單偏振單模光子晶體光纖。不同結(jié)構(gòu)參數(shù)，d下該單偏振單模光子晶體光纖的傳輸特性使用了COMSOL仿真軟件MATLAB模擬。數(shù)值模擬結(jié)果表明在特定波長(zhǎng)范圍y偏振模的限制損耗很高，而x偏振模的限制損耗很低，傳輸一段距離后y偏振模消耗殆盡，從而可實(shí)現(xiàn)單偏振單模運(yùn)轉(zhuǎn)。恰當(dāng)?shù)木匦谓橘|(zhì)層厚度和介質(zhì)層夾角的選擇是本文的關(guān)鍵所在，本文詳細(xì)分析了矩形介質(zhì)層厚度和介質(zhì)層夾角等參數(shù)對(duì)光纖高雙折射特性的影響，通過對(duì)結(jié)構(gòu)參數(shù)的進(jìn)一步優(yōu)化，最后提出了矩形介質(zhì)層厚度d為300nm，矩形介質(zhì)層夾角為 的光纖結(jié)構(gòu)。雙折射的數(shù)量級(jí)達(dá)到數(shù)量級(jí)，在1550nm處雙折射值高達(dá)0.038。在1.21到1.52波長(zhǎng)范圍內(nèi)，x偏振模的限制損耗低于0.1dB/m, y偏振模的限制損耗高于10dB/m,實(shí)現(xiàn)了243nm的單偏振單模運(yùn)轉(zhuǎn)帶寬。


關(guān)鍵詞：光子晶體光纖，單偏振單模，限制損耗，矩形介質(zhì)層，高雙折射



Broadband Single-Polarization Single-Mode Fiber
Abstract In this paper, a new type broadband single-polarization single-mode photonic crystal fiber based on highly birefringence is proposed by using the full vector finite-element method. The confinement loss characteristics of the proposed SPSM-PCF under different structure parameters , d are investigated by using MATLAB and COMSOL simulation software. Numerical simulations reveal that the confinement loss of y-polarization mode is very high, whereas the loss of x-polarization mode is very low at the special wavelength brand. Compared with the x-polarization mode, the y-polarization mode can be suppressed with a shorter fiber length. Rectangular dielectric layer thickness and the dielectric layer angle are the key of this article, the cladding high birefringence have also been studied in detail. Through optimization a new fiber structure is proposed at last, that the rectangular dielectric layer thickness d and half of the angleare 300nm and respectively. The confinement losses of x-polarization are lower than 0.1dB/m, whereas the losses of the y-polarization are larger than 10dB/m within a wavelength range than 1.21 to 1.52, and the single-polarization single-mode operation bandwidth reaches 243nm.

Key words: Photonic Crystal Fiber, Single Polarization Single Mode, Confinement Loss, Rectangular Dielectric Layer，High Birefringence




目錄
寬帶單模單偏振光纖的研究 VII
第一章 緒論 1
1.1課題的研究背景和意義 1
1.2光子晶體光纖的導(dǎo)管機(jī)理及分類 1
1.3保偏光纖到單偏振單模光子晶體光纖的演進(jìn)過程 1
1.4 單偏振單模光子晶體光纖的研究進(jìn)展 2
1.5 單偏振單模光子晶體光纖的設(shè)計(jì)原理及其應(yīng)用 2
1.6 單偏振單模光子晶體光纖典型結(jié)構(gòu) 11
1.7 本論文的研究重點(diǎn)和論文安排 12
第二章 研究單偏振單模光子晶體光纖的理論以及方法 13
2.1 研究光子晶體光纖的方法 13
2.1.1 平面波展開法。 13
2.1.2 全矢量有限元法 14
2.2 COMSOL求解光子晶體光纖基本原理 14
2.3 限制損耗分析 15
2.4 雙折射理論 16
2.5 運(yùn)用單偏振單模的原因以及實(shí)現(xiàn)方法 16
2.6 本章小結(jié) 16
第三章 單偏振單模光子晶體光纖特性研究 18
3.1 設(shè)計(jì)光子晶體光纖的結(jié)構(gòu) 18
3.2 實(shí)現(xiàn)單偏振單模原理 19
3.3 結(jié)構(gòu)參數(shù)對(duì)光纖特性的影響 20
3.3.1 結(jié)構(gòu)參數(shù)θ對(duì)光纖特性的影響 21
3.3.2 結(jié)構(gòu)參數(shù)d對(duì)光纖特性的影響 23
3.4 本章小結(jié) 29
第四章 總結(jié)與展望 31
參考文獻(xiàn) 32
致謝 35