[1] [1] Paul B K, Islam S, Sen S, et al. Low material loss and dispersion flattened fiber for single mode THz-wave transmission applications[J]. Results Phys, 2018, 11: 638–642.

[2] [2] Chen X, Himmelreich J E, Hurley J E, et al. Universal fiber for short-distance optical communications[J]. J Lightw Technol, 2019, 37(2): 389–395.

[3] [3] Han J W, Zhang J. Elasto-optical correction of bend loss for Ge-free fibers with large-effective-area and ultra-low-loss[J]. Opt Fiber Technol, 2020, 54: 102120.

[4] [4] Ohashi M, Shibata N, Sato K. Mode field diameter measurement conditions in single-mode fibres[J]. Electron Lett, 1989, 25(8): 493–495.

[5] [5] Hoo Y L, Jin W, Ju J, et al. Loss analysis of single-mode fiber/photonic-crystal fiber splice[J]. Microw Opt Technol Lett, 2004, 40(5): 378–380.

[9] [9] Michtchenko A, Nava M F. Far field technique applied in single mode optical fibers for studying of modal field diameter[C]//2006 3rd International Conference on Electrical and Electronics Engineering, 2006: 1–3.

[11] [11] Parker A J. Near field measurement of fiber mode field diameters: effects of defocusing[J]. IEEE Trans Instrum Meas, 1995, 44(2): 458–460.

[12] [12] Ohashi M, Miyoshi Y, Kubota H, et al. Longitudinal fiber parameter measurements of multi-core fiber using OTDR[J] Opt Express, 2014, 22(24): 30137–30147.

[14] [14] Nakamura A, Okamoto K, Koshikiya Y, et al. Effective mode field diameter for LP11 mode and its measurement technique[J]. IEEE Photonics Technol Lett, 2016, 28(22): 2553–2556.

[15] [15] Matsui T, Sakamoto T, Nakajima K. Effective mode-field diameter measurement for few-mode fibers[C]//2017 25th Optical Fiber Sensors Conference (OFS), 2017: 1–4.

[22] [22] Miyagi K, Namihira Y, Razzak S M A, et al. Measurements of mode field diameter and effective area of photonic crystal fibers by far-field scanning technique[J]. Opt Rev, 2010, 17(4): 388–392.