title: Spectral analysis of bent fiber Bragg gratings: theory and experiment.
abstract: This Letter presents a simple mathematical model developed from coupled-mode theory to describe the relationship between Bragg transmission loss (BTL), grating length, coupling coefficients, and bending loss in a bent fiber Bragg grating. In our investigation, the finding indicates that the decrement of BTL can be attributed to the increasing bending loss and degradation of both dc and ac coupling coefficients as the bending radius decreases. Besides, the center wavelength shifts as a result of coupling coefficients degradation. The validity of the proposed model is supported by experimental result.
authors.forename: Kok-Sing
authors.initials: KS
authors.lastname: Lim
authors.forename: Hang-Zhou
authors.initials: HZ
authors.lastname: Yang
authors.forename: Ahmed
authors.initials: A
authors.lastname: Becir
authors.forename: Man-Hong
authors.initials: MH
authors.lastname: Lai
authors.forename: Muhammad M
authors.initials: MM
authors.lastname: Ali
authors.forename: Xueguang
authors.initials: X
authors.lastname: Qiao
authors.forename: Harith
authors.initials: H
authors.lastname: Ahmad