title: Long-period grating fabricated by periodically tapering standard single-mode fiber.
abstract: We fabricated an asymmetric long-period grating (LPG) by periodically tapering a section of standard single-mode fiber using a resistive filament heating. The LPG exhibits large peak transmission attenuation of -30.31 dB with only 22 periods in a 1.0 cm long optical fiber and possesses unique characteristics for sensing applications. The bending and strain sensitivities are 1.74 nm m and 1.11 pm/mu epsilon, respectively. The polarization dependent loss is large, up to 11.65 dB, which is caused by an asymmetric index profile in the cross section of the tapered LPG.
authors.affiliation: Center for Optical and Electromagnetic Research, Zhejiang University, Hangzhou, Zhejiang, China. liyangshao@gmail.com
authors.forename: Li-Yang
authors.initials: LY
authors.lastname: Shao
authors.forename: Jian
authors.initials: J
authors.lastname: Zhao
authors.forename: Xinyong
authors.initials: X
authors.lastname: Dong
authors.forename: H Y
authors.initials: HY
authors.lastname: Tam
authors.forename: C
authors.initials: C
authors.lastname: Lu
authors.forename: Sailing
authors.initials: S
authors.lastname: He