Abstract

The shift in the central wavelength of fiber Bragg gratings (FBGs) during annealing of hydrogen-loaded optical fiber exposed to ultraviolet (UV) laser irradiation through a phase mask is studied and shown to be caused by thermal diffusion of hydrogen out of the fiber for both short-period and long-period FBGs. Reloading FBGs with hydrogen followed by a second annealing cycle without exposing the fiber to the UV laser reproduces the details of the wavelength evolution observed during first annealing following UV irradiation. This shows that the wavelength shift of the grating during annealing is determined by diffusion of hydrogen gas out of the optical fiber for both short-period and long-period FBGs.

© 2004 IEEE

Dynamic evolution of the spectrum of long-period fiber Bragg gratings fabricated from hydrogen-loaded optical fiber by ultraviolet laser irradiation

Keio Fujita, Yuji Masuda, Keisuke Nakayama, Maki Ando, Kenji Sakamoto, Jun-pei Mohri, Makoto Yamauchi, Masanori Kimura, Yasuo Mizutani, Susumu Kimura, Takashi Yokouchi, Yoshifumi Suzaki, and Seiki Ejima
Appl. Opt. 44(33) 7032-7038 (2005)

Study of spectral and annealing properties of fiber Bragg gratings written in H₂-free and H₂-loaded fibers by use of femtosecond laser pulses

Yuhua Li, C. R. Liao, D. N. Wang, T. Sun, and K. T. V. Grattan
Opt. Express 16(26) 21239-21247 (2008)

Response of in-fiber Bragg gratings to hydrogen loading and subsequent heat treatment in H₂ ambience

Alexey V. Lanin, Oleg V. Butov, and Konstantin M. Golant
Appl. Opt. 45(23) 5800-5807 (2006)

Annealing properties of fiber Bragg grating UV-inscribed in boron-germanium codoped fiber

Xinpu Zhang, Liyang Shao, Haijun He, Wei Pan, and Lianshan Yan
Appl. Opt. 56(22) 6201-6205 (2017)

Effect of two annealing processes on the thermal regeneration of fiber Bragg gratings in hydrogenated standard optical fibers

Kai Lu, Hangzhou Yang, Kok-Sing Lim, Harith Ahmad, Pan Zhang, Qin Tian, Xiangzi Ding, and Xueguang Qiao
Appl. Opt. 57(24) 6971-6975 (2018)