title: Tunable superstructure fiber Bragg grating with chirp-distribution modulation based on the effect of external stress.
abstract: We report an external stress modulation method for producing a superstructure fiber Bragg grating (FBG) with approximate cascaded resonant cavities composed of different index chirp distributions. The 15 mm uncoated apodized uniform-period FBG is pressed by the vertical stress from the upper 11 pieces of the pattern plate controlled by a piezoelectric ceramic actuator. The piece length is 1 mm, and the interval of the adjacent pieces is 0.4 mm. The reflectivity of the modulated FBG gradually shows six obvious multichannel 75%-85% reflection peaks with the increase of the vertical stress of each pattern-plate piece from 0 to 30 N. The channel spacing is steady at about 10 GHz for a C-band wavelength division multiplexing system.
authors.affiliation: School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China.
authors.forename: Yize
authors.initials: Y
authors.lastname: Huang
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.forename: Huiqun
authors.initials: H
authors.lastname: Zhu
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Tong
authors.forename: Baoying
authors.initials: B
authors.lastname: Fang
authors.forename: Liu
authors.initials: L
authors.lastname: Li
authors.forename: Yujian
authors.initials: Y
authors.lastname: Shen
authors.forename: Qiuxin
authors.initials: Q
authors.lastname: Zheng
authors.forename: Qian
authors.initials: Q
authors.lastname: Liang
authors.forename: Meng
authors.initials: M
authors.lastname: Yan
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Qin
authors.forename: Jie
authors.initials: J
authors.lastname: Ding
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Wang