結構參數對光子晶體光纖雙折射之影響研究

Investigation of structural parameters on birefringence of photonic crystal fiber

許敏雄(Hsu-Min Hsiung)

指導教授 ： 廖炯州

共同指導教授 ： 周趙遠鳳(Yuan-Fong Chou Chau)

健行科技大學/電資學院/電子工程系碩士班/碩士(2015年)

https://doi.org/10.6824/UCH.2015.00001

摘要

我們提出了一個新穎設計的高雙折射率導模光子晶體光纖（PCF）。此PCF結構是以實心矽為纖蕊及兩種不同尺寸且被壓縮的橢圓形空氣孔為纖衣所組成。以有限元素法對此PCF基模模態之雙折射進行數值分析與計算。計算結果顯示，我們所提出的結構具有非常高的雙折射差，當入射波為λ=1550nm時，其雙折射差可達2.6×10-2。本論文主要貢獻為討論纖衣部分使用兩種不同尺寸的橢圓空氣孔時，其空氣孔之孔心間距、纖衣之空氣孔圈數與PCF雙折射差及損耗之相對關係。此一結構之設計可獲得較高雙折射PCF，本論文可提供後續類似此結構PCF之設計參考。

關鍵字

有限元素法 ； 雙折射 ； 光子晶體光纖

並列摘要

We propose a novel high-birefringence index-guiding photonic crystal fiber (PCF). This PCF is composed of a solid silica core and a cladding with two differently sized squeezed elliptical air-holes. The mode birefringence of a fundamental mode in such PCFs is analyzed numerically by the finite-element method. Numerical results reveal that an extraordinarily high modal birefringence at the excitation wavelength of λ= 1550 nm, 2.6 ×10-2, is acquired. The contributions of the cladding with two different sizes of air-hole ellipticity, the center-to-center distance between the air-holes, and the number of cladding rings as well as the confinement loss to the birefringence are systematically evaluated. The evolution of birefringence with the structural variations shows that our highly birefringent fiber can be designed in a controlled manner.

並列關鍵字

finite-element method ； birefringent ； photonic crystal fiber

參考文獻

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