[1] Z. W. Tan, Y. Liu, Y. Chen et al.. 8 × 10 Gb/s transmission system over 1500 km on G.652 fiber dispersion compensated by chirped fiber gratings[J]. Chin. Opt. Lett., 2005, 3(8): 441～443

[4] Q. Zhang, D. A. Brown, L. J. Reinhart et al.. Linearly and nonlinearly chirped Bragg gratings fabricated on curved fibers[J]. Opt. Lett., 1995, 20(10):1122～1124

[6] K. Sugden, I. Bennion, A. Molony et al.. Chirped gratings produced in photosensitive optical fibers by fibre deformation during exposure[J]. Electron. Lett., 1994, 30(5): 440～442

[7] T. Erdogan. Fiber grating spectra[J]. Lightwave Technol., 1997, 15(8): 1277～1294

[9] Z. Xiong, G. D. Peng, B. Wu et al.. Effects of the zeroth-order diffraction of a phase mask on Bragg gratings[J]. Lightwave Technol., 1999, 17(11): 2361～2365

[10] D. Park, M. Kim. Simple analysis of the energy density distribution of the diffracted ultraviolet beam from a fiber Bragg grating phase mask[J]. Opt. Lett., 2004, 29(16): 1849～1851

[11] K. P. Chen, P. R. Herman. Photosensitization of standard fibers with deep UV laser radiation[J]. J. Lightwave Technol., 2003, 21(9): 1958～1967

[12] G. A. Miller, C. G. Askins, G. A. Cranch et al.. Early index growth in germanosilicate fiber upon exposure to continuous-wave ultraviolet light[J]. J. Lightwave Technol., 2007, 25(4): 1034～1044