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新型高双折射微结构纤芯光子晶体光纤的可调谐超连续谱的特性研究

熊梦杰 李进延 罗兴 沈翔 彭景刚 李海清

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新型高双折射微结构纤芯光子晶体光纤的可调谐超连续谱的特性研究

熊梦杰, 李进延, 罗兴, 沈翔, 彭景刚, 李海清

Experimental and numerical study of tuneable supercontinuum generation in new kind of highly birefringent photonic crystal fiber

Xiong Meng-Jie, Li Jin-Yan, Luo Xing, Shen Xiang, Peng Jing-Gang, Li Hai-Qing
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  • 提出并制备了一种新型微结构纤芯光子晶体光纤,即在椭圆纤芯中增加一排亚微米级的空气孔,提高了光纤的双折射值,改变了两个偏振基模的色散特性.通过有限元法数值模拟了该光纤的双折射、非线性和色散等特性,并优化结构参数.使用脉宽为15 ps,重复频率为45 MHz的激光抽运该光纤,通过调节抽运激光入射的偏振方向,实现了可调谐的宽带超连续谱.实验研究了输入激光的功率和偏振方向对超连续谱的影响,以及输出超连续谱的偏振特性:当脉冲偏振方向沿着主轴入射时,得到了800–1500 nm的线偏振超连续谱,输出谱的消光比为21.2 dB;当脉冲偏振方向逐渐远离主轴时,输出超连续谱的谱宽逐渐变窄,并且在与主轴呈处达到最小值.维持抽运脉冲功率不变,仅改变脉冲入射的偏振方向,能够实现300 nm谱宽可调谐的超连续谱.
    We report on a new kind of highly birefringent and highly nonlinear photonic crystal fiber with a row of sub-micron air hole in the fiber core. The diameters of air holes in fiber core and cladding are 0.2 μm and 6.6 μ$m respectively. The parameters of birefringence, nonlinear and dispersion coefficient of the fiber are simulated by finite element method. It is found that the birefringence of the fiber can exist at the wavelengths up to 1550 nm, which is one order of magnitude higher than that of the traditional polarization-maintaining fiber. The zero-dispersion wavelengths of the fast axis and slow axis are 1050 nm and 1080 nm respectively. This fiber has a clear advantage over conventional fiber in continuum generation. Firstly, the polarization state of the pulse traveling in the fiber can be sustained along the fiber length and the extinction ratio is more than 20 dB. In addition, the pulses travel at different group velocities along the two polarization directions, which provide a convenient way of tuning the properties of the generated supercontinuum. Using this fiber as a nonlinear medium, an efficient generation of a tunable supercontinuum is demonstrated by pumping with 15 ps pulses of 1040 nm laser radiation, which is located in the normal dispersion region. A half-wave plate is used to vary the input polarization of the light pulse launched into the fiber, and the polarization of output supercontinuum is adjusted by a Glan prism at the same time. It is experimentally found that the polarization of pulse has a significant influence on the generation of the supercontinuum. When the linear polarization of the input pulse matches with the direction of the main axis of the fiber, the supercontinuum can be broadened over wavelength range of 800-1500 nm, and the extinction ratio is 21.2 dB. The polarization direction of the output SC is found to coincide with the pump pulse. When the angle between the polarization of the input pulse and the fast axis is increased to 45 degrees, the output supercontinuum is circularly polarized and becomes narrowest, extending from 900 to 1300 nm. So we can realize the wide tuning of a supercontinuum by only changing the polarization direction of the incident pulse. Under the circumstances, the pulse in optical fiber can be broken into two components along the main axis respectively. If the input polarization direction is away from both principal axis directions, the power along the main axis and the contribution of cross phase modulation are reduced because of the walk-off effect, so the width of the supercontinuum will become narrower. It is suggested that this type of high birefringence photonic crystal fiber could be effectively applied to the generation of the tunable supercontinuum.
      通信作者: 李进延, ljy@mail.hust.edu.cn
    • 基金项目: 国家自然科学基金(批准号:61535009)资助的课题.
      Corresponding author: Li Jin-Yan, ljy@mail.hust.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 61535009).
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    Schmitt S, Ficker J, Wolff M, Konig F, Sizmann A, Leuchs G 1998 Phys. Rev. Lett. 81 2446

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    Proulx A, Menard J M, Hô N, Laniel J M, Vallée R, Paré C 2003 Opt. Express 11 3338

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    Yao Y Y 2009 M. S. Thesis (Yanshan: Yanshan University) (in Chinese) [姚艳艳 2009 硕士学位论文 (秦皇岛: 燕山大学)]

  • [1]

    Alfano R R, Shapiro S L 1970 Phys. Rev. Lett. 24 584

    [2]

    Ranka J K, Windeler R S, Stentz A J 2000 Opt. Lett. 25 25

    [3]

    Wang Z X, Liu J S, Li R X, Xu Z Z 2009 Opt. Express 17 13841

    [4]

    Dudley J M, Provino L, Grossard N, Maillotte H, Windeler R S, Eggleton B J, Coen S 2002 J. Opt. Soc. Am. B 19 765

    [5]

    Hu M L, Wang Q Y, Li Y F, Wang Z, Zhang Z G, Chai L, Zhang R B 2004 Acta Phys. Sin. 53 4243 (in Chinese) [胡明列, 王清月, 栗岩峰, 王专, 张志刚, 柴路, 章若冰 2004 物理学报 53 4243]

    [6]

    Hartl I, Li X D, Chudoba C, Ghanta R K, Ko T H, Fujimoto J G, Ranka J K, Windeler R S 2001 Opt. Lett. 26 608

    [7]

    Holzwarth R, Udem T, Hansch T W, Knight J C, Wadsworth W J, Russell P S J 2000 Phys. Rev. Lett. 85 2264

    [8]

    Moeser J T, Wolchover N A, Knight J C, Omenetto F G 2007 Opt. Lett. 32 952

    [9]

    Konorov S O, Zheltikov A M 2003 Opt. Express 11 2440

    [10]

    Udem T, Holzwarth R, Hänsch T W 2002 Nature 416 233

    [11]

    Fsaifes I, Cordette S, Tonello A, Couderc V, Lepers C, Ware C, Leproux P, Buy-Lesvigne C 2010 Photon. Technol. Lett. 22 1367

    [12]

    Begum F, Namihira Y, Kinjo T, Kaijage S 2011 Opt. Commun. 284 965

    [13]

    Schmitt S, Ficker J, Wolff M, Konig F, Sizmann A, Leuchs G 1998 Phys. Rev. Lett. 81 2446

    [14]

    Silberhorn C, Lam P K, Wei O, Konig F, Korolkova N, Leuchs G 2001 Phys. Rev. Lett. 86 4267

    [15]

    Tsai K H, Kim K S, Morse T F 1991 J. Lightwave Technol. 9 7

    [16]

    Lehtonen M, Genty G, Ludvigsen H, Kaivola M 2003 Appl. Phys. Lett. 82 2197

    [17]

    Proulx A, Menard J M, Hô N, Laniel J M, Vallée R, Paré C 2003 Opt. Express 11 3338

    [18]

    Xiong C, Wadsworth W J 2008 Opt. Express 16 2438

    [19]

    Zhao Y Y, Zhou G Y, Li J S, Han Y, Wang C, Wang W 2013 Acta Phys. Sin. 62 214212 (in Chinese) [赵原源, 周桂耀, 李建设, 韩颖, 王超, 王伟 2013 物理学报 62 214212]

    [20]

    Yao Y Y 2009 M. S. Thesis (Yanshan: Yanshan University) (in Chinese) [姚艳艳 2009 硕士学位论文 (秦皇岛: 燕山大学)]

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出版历程
  • 收稿日期:  2016-12-26
  • 修回日期:  2017-01-18
  • 刊出日期:  2017-05-05

新型高双折射微结构纤芯光子晶体光纤的可调谐超连续谱的特性研究

  • 1. 华中科技大学, 武汉光电国家实验室, 武汉 430074
  • 通信作者: 李进延, ljy@mail.hust.edu.cn
    基金项目: 国家自然科学基金(批准号:61535009)资助的课题.

摘要: 提出并制备了一种新型微结构纤芯光子晶体光纤,即在椭圆纤芯中增加一排亚微米级的空气孔,提高了光纤的双折射值,改变了两个偏振基模的色散特性.通过有限元法数值模拟了该光纤的双折射、非线性和色散等特性,并优化结构参数.使用脉宽为15 ps,重复频率为45 MHz的激光抽运该光纤,通过调节抽运激光入射的偏振方向,实现了可调谐的宽带超连续谱.实验研究了输入激光的功率和偏振方向对超连续谱的影响,以及输出超连续谱的偏振特性:当脉冲偏振方向沿着主轴入射时,得到了800–1500 nm的线偏振超连续谱,输出谱的消光比为21.2 dB;当脉冲偏振方向逐渐远离主轴时,输出超连续谱的谱宽逐渐变窄,并且在与主轴呈处达到最小值.维持抽运脉冲功率不变,仅改变脉冲入射的偏振方向,能够实现300 nm谱宽可调谐的超连续谱.

English Abstract

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