title: Tunable phase-shifted fiber Bragg grating based on femtosecond laser fabricated in-grating bubble.
abstract: We present a type of phase-shifted fiber Bragg gratings based on an in-grating bubble fabricated by femtosecond (fs) laser ablation together with a fusion-splicing technique. A microchannel vertically crossing the bubble is drilled by fs laser to allow liquid to flow in or out. By filling different refractive index (RI) liquid into the bubble, the phase-shift peak is found to experience a linear red shift with the increase of RI, while little contribution to the change of phase shift comes from the temperature and axial strain. Therefore, such a PS-FBG could be used to develop a promising tunable optical filter and sensor.
authors.forename: Changrui
authors.initials: C
authors.lastname: Liao
authors.forename: Lei
authors.initials: L
authors.lastname: Xu
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: D N
authors.initials: DN
authors.lastname: Wang
authors.forename: Yiping
authors.initials: Y
authors.lastname: Wang
authors.forename: Qiao
authors.initials: Q
authors.lastname: Wang
authors.forename: Kaiming
authors.initials: K
authors.lastname: Yang
authors.forename: Zhengyong
authors.initials: Z
authors.lastname: Li
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Zhong
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Zhou
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Liu