光学学报, 2009, 29 (s2): 125, 网络出版: 2010-01-27  

实用化色散补偿光子晶体光纤设计

作者单位
北京交通大学 光波技术研究所, 北京 100044
摘要
应用全矢量有限元法理论分析了普通同轴双芯掺杂结构产生大负色散特性的结构特点和原理,将这种双芯结构引入到光子晶体光纤(PCF)中,并提出一种新型的可实用化的色散补偿光子晶体光纤(DCPCF)结构。该结构由掺氟棒构成较低折射率的环形外芯,而内芯采用纯石英材料以降低由于掺杂过程引入的附加损耗,空气孔采用同一尺寸以简化制作工艺,选用7.5 μm左右的大孔距来获得与普通单模光纤耦合时的模场匹配。通过改变包层中空气孔的孔距、孔径,掺氟区域的大小和掺氟量,可以对光纤的色散特性进行调节。得出在Λ=7.5 μm, d/Λ=0.44, dF/Λ=0.45, nF=1.436788时,在1550 nm附近的色散值在-1240 ps/(nm·km)左右,内芯的模场面积为74.7 μm2。
Abstract
By using full vector finite element method, a novel practicable dispersion compensation photonic crystal fiber (DCPCF) is proposed based on the construction features and principle of traditional concentric dual-core doped silica fibers. The DCPCF structure is composed of lower refractive index outer ring core and pure silica inner core for reducing the doping-procedure-induced added losses. The air holes have the same diameter to simplify the fabrication, and the hole-pitch adopts as large as 7.5 μm to pursue the model field area matching with traditional single mode fibers (SMFs). By adjusting hole-pitch, hole diameter, quantities and sizes of fluorine doped region, the dispersion properties of DCPCF can be designed freely. After a series of calculation, when Λ=7.5 μm, d/Λ=0.44 dF/Λ=0.45 and nF=1.436788, the dispersion value is about -1240 ps/(nm·km) and inner core mode field area is 74.7 μm2 around the wavelength of 1550 nm.

李宏雷, 娄淑琴, 郭铁英, 陈卫国, 王立文, 简水生. 实用化色散补偿光子晶体光纤设计[J]. 光学学报, 2009, 29(s2): 125. Li Honglei, Lou Shuqin, Guo Tieying, Chen Weiguo, Wang Liwen, Jian Shuisheng. [J]. Acta Optica Sinica, 2009, 29(s2): 125.

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