多模光纤中简并模式群的分别探测

杨春; 王勇; 徐长青

光学学报, 2006, 26 (10): 1459, 网络出版: 2006-10-31

多模光纤中简并模式群的分别探测

Separate Detection of Degenerated Mode Group of Multimode Fiber

论文大纲

杨春 ^1,*王勇 ²徐长青 ²

作者单位

¹ 东南大学电子工程系光子学与光通信研究室, 南京 210096

² Department of Engineering Physics, McMaster University, Hamilton, Ontario, Canada

光纤光学多模光纤倾斜光纤光栅模式辐射光线模式分离 fiber optics multimode optical fiber tilted fiber Bragg grating mode radiation ray mode separation

摘要

用多模倾斜光纤光栅(Tilted fiber Bragg grating,TFBG)实现多模光纤中简并模式群(Degenerated mode group,DMG)的分别探测。多模倾斜光纤光栅将光纤中的导模耦合到辐射光线,用透镜将辐射光线聚焦在焦平面上,使非简并模式群对应的辐射光线的像在焦平面上分离。在焦平面上用空间滤波器使简并模式群选择透过并进行分别探测。用芯径为62.5 μm的标准通信多模光纤进行了简并模式群分别探测实验,用单模光纤激励多模光纤,测量简并模式群功率随激励光纤的横向对准偏差的变化关系。低阶简并模式群的测量结果与仿真计算结果基本一致,高阶简并模式群的测量结果与仿真结果有一些不同。用倾斜光纤光栅进行单简并模式群激励,在单简并模式群条件下测量简并模式群耦合效率的想法还需进一步实验验证。

Abstract

Separate detection of the degenerate mode groups (DMGs) of multimode fiber was realized by using a multimode tilted fiber Bragg grating (TFBG). With multimode TFBG, the DMGs were coupled into the radiation ray that was focused separately on the focal plane of a lens. The radiation ray corresponding to the nondegenerate mode group is separated on the focal plane, so that the radiation ray of DMGs was selected and detected. The experiment of DMG separate detection was conducted with a standard communication multimode fiber with a core diameter of 62.5 μm. The multimode fiber was excited by a single mode fiber, and optical power of DMGs was measured while changing the lateral misalignment of exciting fiber. The measured results of the lowerorder DMGs were in consistence with the numerical results, but there appeared a few deviations for the higherorder DMGs. Further experiments needed to be conducted to verify the idea of exciting a single DMG in a multimode fiber using a TFBG and then measuring the coupling coefficient under this condition.

参考文献

[1] Yang Chun, Bi Xiaofeng, Guan Zhiqiang. Optical power distribution in multimode polymer optical fiber under offset launching[J]. Acta Optica Sinica, 2004, 24(9): 1259～1264 (in Chinese)
杨春,毕晓峰,管志强. 偏心激励聚合物光纤横截面的光功率分布[J]. 光学学报, 2004,24(9): 1259～1264

[2] Zhan Yage, Lei Jianqiu, Liang Peihui et al.. Study of the laser beam quality and polarization degree in largecore optical power fiber[J]. Chin. J. Lasers, 2004, 31(2): 173～176 (in Chinese)
詹亚歌, 雷建求, 梁培辉等. 大芯径功率光纤中传输的激光束质量与偏振度研究[J]. 中国激光, 2004, 31(2): 173～176

[3] Wang Honghai, Tong Weijun. Effect of periodic scrambling on the transmitting characteristic of multimode fibers[J]. Chin. J. Lasers, 2004, 31(2): 177～180 (in Chinese)
汪洪海, 童维军. 周期性扰动对多模光纤传输性能的影响[J]. 中国激光, 2004, 31(2): 177～180

[4] Jianzhong Gao, Zhuangde Jiang, Yulong Zhao et al.. Full distributed fiber optical sensor for intrusion detection in application to buried pipelines[J]. Chin. Opt. Lett., 2005, 3(11): 633～635

[5] . Pepeljugoski, S. E. Golowich, A. J. Ritger et al.. Modeling and simulation of nextgeneration multimode fiber links[J]. J. Lightwave Technol., 2003, 21(5): 1242-1255.

[6] . E. Golowich, W. A. Reed, A. J. Ritger. A new modal power distribution measurement for highspeed shortreach optical systems[J]. J. Lightwave Technol., 2004, 22(2): 457-468.

[7] . Ramachandran, B. Mikkelsen, L. C. Cowsar et al.. Allfiber gratingbased higher order mode dispersion compensator for broadband compensation and 1000km transmission at 40 Gb/s[J]. IEEE Photon. Technol. Lett., 2001, 13(6): 632-634.

[8] . Kumar, N. K. Goel, R. K. Varshney. Studies on a fewmode fiber|optic strain sensor based on LP01LP02 mode interference[J]. J. Lightwave Technol., 2001, 19(3): 358-362.

[9] D. Rittich. Practicability of determining the modal power distribution by measured near and far fields[J]. J. Lightwave Technol., 1985, LT3(3): 652～661

[10] . Yang, Y. Wang, C. Q. Xu. A novel method to measure modal power distribution in multimode fibers using tilted fiber Bragg gratings[J]. IEEE Photon. Technol. Lett., 2005, 17(10): 2146-2148.

[11] R. Kashyap. Fiber Bragg Gratings[M]. San Diego: Academic Press, 1999. 158～165

[12] . Li, M. Froggatt, T. Erdogan. Volume current method for analysis of tilted fiber gratings[J]. J. Lightwave Technol., 2001, 19(10): 1580-1591.

[13] Fan Chongcheng, Peng Jihu. Guided Wave Optics[M]. Beijing: Beijing Institute of Technology Press, 1988. 126 (in Chinese)
范崇澄,彭吉虎. 导波光学[M]. 北京: 北京理工大学出版社, 1988. 126

[14] Yang Chun, Gao Feng. Numerical simulation on effect of saturation length for fewmode fiber grating[J]. Acta Photonica Sinica, 2005, 34(12): 1853～1857 (in Chinese)
杨春,高峰. 饱和长度对少模光纤光栅影响的数值仿真[J]. 光子学报, 2005, 34(12): 1853～1857

[15] . Kokou, L. Sophie, F. Marie. Numerical analysis of the contribution of the transverse asymmetry in the photoinduced index change profile to the birefringence of optical fiber[J]. J. Lightwave Technol., 2002, 20(8): 1463-1470.

杨春, 王勇, 徐长青. 多模光纤中简并模式群的分别探测[J]. 光学学报, 2006, 26(10): 1459. 杨春, 王勇, 徐长青. Separate Detection of Degenerated Mode Group of Multimode Fiber[J]. Acta Optica Sinica, 2006, 26(10): 1459.

多模光纤中简并模式群的分别探测

关于本站 Cookie 的使用提示

全站搜索

多模光纤中简并模式群的分别探测

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索