[1] [1] K. Thyagarajan, R. K. Varshney, P. Palai, A. K. Ghatak and L. C. Goyal, IEEE Photon. Technol. Lett. 8, 1510 (1996).

[2] [2] Jingyuan Wang, Chun Jang, Weisheng Hu and Mingyi Gao, Opt. Laser Technol. 38, 169 (2006).

[3] [3] T. J. Yang, L. F. Shen, Y. F. Chau, M. J. Sung, D. Chen and D. P. Tsai, Opt. Commun. 281, 4334 (2008).

[4] [4] J. H. Liou, S. S. Huang and C. P. Yu, Opt. Commun. 283, 971 (2010).

[5] [5] J. L. Auguste, R. Jindal, J. M. Blondy, M. Clapeau, J. Marcou, B. Dussardier, G. Monnom, D. B. Ostrowsky, B. P. Pal and K. Thygarajan, Electron. Lett. 36, 1689 (2000).

[6] [6] F. Gér me, J.-L.Auguste and J.-M. Blondy, Optics Lett. 29, 2725 (2004).

[7] [7] Yi Ni, Lei Zhang, Liang An, Jiangde Peng and Chongcheng Fan, IEEE Photon. Technol. Lett. 16, 1516 (2004).

[8] [8] A. Huttunen, Opt. Express 13, 627 (2005).

[9] [9] Zhihua Zhang, Yifei Shi, Baomin Bian and Jian Ju, IEEE Photon. Technol. Lett. 20, 1402 (2008).

[10] [10] Wang Honghua, Xue Wenrui and Zhang Wenmei, Acta Optica Sinica 28, 27 (2008). (in Chinese)

[11] [11] Ming Chen, Qing Yang, Tiansong Li, Mingsong Chen and Ning He, Opt. Int. J. Light Electron. Opt. 121, 867 (2010).

[12] [12] Han Jiawei and Hou Shanglin, Slope-Matching Profile Optimization of Dual-Concentric-Core Photonic Crystal Fiber for Broadband Dispersion Compensation, ACP, Shang Hai, 1 (2009).

[13] [13] Soan Kim and Chul-Sik Kee, Opt. Express 17, 15885 (2009).

[14] [14] Maggie Yihong Chen, Harish Subaraman and Ray T. Chen, Dual-Concentric-Core Photonic Crystal Fiber with -5400 ps/ nm/km Dispersion Coefficient, OSA/OFC/NFOEC, 2009.

[15] [15] Aliramezani M. and Mohammad Nejad Sh., Opt. Laser Technol. 42, 1209 (2010).

[16] [16] Yu Wenke, Lou Caiyun, Zhao Xiaofan, Lu Dan and Chen Jianhua, Acta Optica Sinica 31, 30 (2011). (in Chinese)

[17] [17] Arismar Cerqueira S. Jr., F. Luan, C. M. B. Cordeiro, A. K. George and J. C. Knight, Design and Fabrication of Hybrid Photonic Crystal Fibers, CLEO/QELS Conference, 1 (2006).

[18] [18] Arismar Cerqueira S. Jr., F. Luan, C. M. B. Cordeiro, A. K. George and J. C. Knight, Opt. Express 14, 926 (2006).

[19] [19] Mathias Perrin, Yves Quiquempois, G’eraud Bouwmans and M.Douay, Opt. Express 15, 13783 (2007).

[20] [20] Limin Xiao, Wei Jin and M. S. Demokan, Opt. Express 15, 15637 (2007).

[21] [21] J. Sun and C. C. Chan, J. Opt. Soc. Am. B. 24, 2640 (2007).

[22] [22] Xiao-Hui Fang, Ming-Lie Hu, Yan-Feng Li, Lu Chai, Ching- Yue Wang and Aleksei M. Zheltikov, Opt. Lett. 35, 493 (2010).

[23] [23] Nicolai Granzow, Patrick Uebel, Markus A. Schmidt, Andrey S. Tverjanovich, Lothar Wondraczek and Philip St. J. Russell, Opt. Lett. 36, 2432 (2011).

[24] [24] Saitoh. Kunimasa and Koshiba. Masanori, Optics Express 11, 3100 (2003).

[25] [25] Ying Liu, Yuquan Li, Jingyuan Wang, Rong Wang, Jianhua Li and Xiaogang Xie, Optics & Laser Technology 44, 2076 (2012).