[1] [1] Recommendation ITU-T G.657. Characteristics of a Bending Loss Insensitive Single Mode Optical Fiber and Cable for the Access. Network[S]. ITU-T Fiber Standard, 2006. 1-15.

[2] [2] Bing Y, Ohsono K, Kurosawa Y, et al.. Low-loss holey fiber[J]. Hitachi Cable Review, 2005, (24): 1-5.

[3] [3] Li M J. Bend-Insensitive Optical Fibers Simplify Fiber-to-the-Home Installations[OL]. http://spie. org/x23952. xml high light=x2402, 2008-04-21.

[4] [4] Watekar P R, Ju S, Yoon Y S, et al.. Design of a trenched bend insensitive single mode optical fiber using spot size definitions[J]. Opt Express, 2008, 16(18): 13545-13551.

[5] [5] Watekar P R, Ju S, Htein L, et al.. A simple and reliable method to determine LP11 cutoff wavelength of bend insensitive fiber[J]. Opt Express, 2010, 18(13): 13761-13771.

[6] [6] Goto Y, Nakajima K, Kurashima T. Low bending-loss fiber using cladding diameter optimization[C]. Opto-Electronics and Communications Conference (OECC) 2012, 2012. 813-814.

[7] [7] Faustini L, Martini G. Bend loss in single-mode fibers[J]. J Lightwave Technology, 1997, 15(4): 671-679.

[8] [8] Fini J M, Nicholson J W. Bend compensated large-mode-area fibers: achieving robust single-modedness with transformation optics[J]. Opt Express, 2013, 21(16): 19173-19179.

[9] [9] Wang Q, Farrell G, Feir T. Theoretical and experimental investigations of macro-bend losses for standard single mode fibers[J]. Opt Express, 2005, 13(12): 4476-4484.

[10] [10] Ren G, Lin Z, Zheng S, et al.. Resonant coupling in trenched bend-insensitive optical fiber[J]. Opt Lett, 2013, 38(5): 781-783.