[1] [1] characterization of a film coated on the optical fiber[J]. Optical Fiber Technology, 2017, 36: 382–386.

          Ekici C, Dinleyici M S. A practical approach for optical

[2] [2] Zhang H, Kuschmierz R, Czarske J. Miniaturized interferometric 3-D shape sensor using coherent fiber bundles[J]. Optics and Lasers in Engineering, 2018, 107: 364–369.

[3] [3] Zhang X J, Zhao J L, Hou J P. A novel photonic crystal fiber with high birefringence[J]. Acta Physica Sinica, 2007, 56(8): 4668–4676.

[4] [4] General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Management Committee. Specifications for optical fibre test methods-Part 20: measurement methods and test procedures for dimensions-fiber geometry: GB/T 15972.20–2008[S]. Beijing: China Standard Press, 2008.

[5] [5] Chen L, Chen J B, Lu R H. Automatic measurement of optical fiber geometric parameters[J]. Acta Optica Sinica, 2001, 21(10): 1245–1248.

[6] [6] Zhao X Y, Chen T, Ding Z X. Research on automatic measurement system for fiber end-face parameters[J]. Optical Instruments, 2009, 31(4): 1–6.

[7] [7] Chang Y Y, Wang L A. Silicon cored fiber diameter measurement[C]//Proceedings of 2015 International Conference on Optical MEMS and Nanophotonics, 2015: 1–2.

[8] [8] Lin Y D, Li P, Li X. Data processing method for MFD measurement by means of continuous variable aperture far field[J]. Modern Measurement and Test, 1999(5): 29–31, 36.

[9] [9] Gander W, Golub G H, Strebel R. Least–squares fitting of circles and ellipses[J]. BIT Numerical Mathematics, 1994, 34(4): 558–578.

[10] [10] Yin A E, Jiang Z X, Zhang Y L. Refracted near-field technique for the measurement of optical fiber refractive index profiles[J]. Acta Optica Sinica, 1989, 9(2): 181–185.

[11] [11] Gao Y C. Simulation of measuring the optical fiber refractive index profiles by refraction near-field method[D]. Harbin: Harbin Engineering University, 2012.

[12] [12] Sun H G, Chu J R, Zhong L S, et al. Measurement of refractive-index profile of plastic optical fibers[J]. Optical Fiber & Electric Cable, 2001(4): 12–16.

[13] [13] Li C X, Li L Y, Yang S X, et al. Study on mode field diameter standard of single-mode optical fiber[J]. Modern Transmission, 2013(2): 72–76.

[14] [14] Shen N L, Tu J K, Wang J C, et al. Research and design of optical fiber geometry testing instrument[J]. Modern Transmission, 2008, 34(6): 51–54.

[15] [15] Ou P. Advanced Optical Simulation (MATLAB Version)-Optical Waveguide, Laser[M]. 2nd ed. Beijing: Beihang University Press, 2014.

[16] [16] Guo F Y, Li L H, Wang M H. Gaussian approximation for mode field distribution of dielectric planar waveguide TE0 mode[J]. Chinese Journal of Lasers, 2008, 35(2): 235–239.

[17] [17] Song X L, Li B B, Wang S Y, et al. A new measurement of light intensity distribution with divergence[J]. Semiconductor Optoelectronics, 2007, 28(4): 572–575.

[18] [18] Marcuse D. Gaussian approximation of the fundamental modes of graded-index fibers[J]. Journal of the Optical Society of America, 1978, 68(1): 103–109.

[19] [19] Li Y M, Tu J K, Xiang H Z, et al. Measurement of optical fiber geometric parameters with Canny operator and binaryzation filtering[J]. Optical Technique, 2018, 44(5): 513–518.

[20] [20] Li Y M, Zheng G, Tu J K, et al. Measurement of optical fiber geometry with arbitrary ellipse curve fitting[J]. Opto-Electronic Engineering, 2019, 46(5): 180319.

[21] [21] Liu W, Tang C H, Ma X M, et al. Measurement of geometric parameters of defective fiber ends[J]. Study on Optical Communications, 2013(6): 35–38.

[22] [22] Mu D D, Zhu Y T, Zhang K. Modulation of annular light distribution by mechanical fiber scrambler[J]. Journal of Applied Optics, 2012, 33(5): 996–1001.