[1] [1] K O Hill, G Meltz. Fiber Bragg grating technology fundamentals and overview［J］. J Lightwave Technol, 1997, 15(8): 1263-1276.

[2] [2] I Bennion, L Zhang. Fiber Bragg grating technologies and applications in sensors［C］. Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, 2006, OFF3.

[3] [3] D Johlen, F Knappe, H Renner, et al.. UV-induced absorption, scattering and transmission losses in UV-side-written fibers ［C］. Optical Fiber Communication Conference and the International Cenference on the Integrated Optics and Optical Fiber Communication, 1999, ThD1, 50～52.

[4] [4] V Finazzi, M N Zervas. Effect of periodic background loss on grating spectrum［J］. Appl Opt, 2002, 41(12): 2240-2250.

[5] [5] H Renner, D Johlen, E Brinkmeyer. Modal field deformation and transition losses in UV side-written optical fibers［J］. Appl Opt, 2000, 39(6): 933-940.

[6] [6] Tan Zhongwei, Li Bin, Wang Yanhua, et al.. Background loss of the fiber induced by the ultraviolet light exposure［J］. Chinese J Lasers, 2007, 34(2): 239-242.

[7] [7] Xu Y Z, Tam H Y, Liu S Y, et al.. Pump-induced thermal effects in Er-Yb fiber grating DBR lasers［J］. IEEE Photon Technol Lett, 1998, 10(9): 1253-1255.

[8] [8] Ian C M Littler, Thomas Grujic, Benjamin J Eggleton. Photothermal effects in fiber Bragg gratings［J］. Appl Opt, 2006, 45(19): 4679-4685.

[9] [9] W Guan, J R Marciante. Pump-induced, dual-frequency switching in a short-cavity, ytterbium-doped fiber laser［J］. Opt Express, 2007, 15(23): 14979-14992.

[10] [10] Damien Kinet, Christophe Caucheteur, Marc Wuilpart, et al.. Photothermal group delay tuning in nonpermanently phase-shifted chirped FBGs［J］. IEEE Photon Technol Lett, 2012, 24(7): 557-559.