title: Directional dependence of spectra of fiber Bragg gratings due to excess loss.
abstract: The reflectance spectra of chirped fiber Bragg gratings can depend substantially on the direction from which the measurement is taken. The measured difference between forward and backward reflectance spectra measured in a linearly chirped grating was shown to be due to the measured excess loss. Simulation using the popular transfer-matrix model demonstrated that the observed asymmetric behavior could be obtained only when excess loss has an asymmetric spectral shape about the local Bragg wavelengths. Application of cladding mode excess losses to the result of a transfer-matrix model accounted for the experimental observation.
authors.affiliation: Optical Technology Research Laboratory, Centre for Telecommunications and Microelectronics, Victoria University, Melbourne VIC 8001, Australia. daniel.kitcher@vu.edu
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Kitcher
authors.forename: Anbhawa
authors.initials: A
authors.lastname: Nand
authors.forename: Scott A
authors.initials: SA
authors.lastname: Wade
authors.forename: Rhys
authors.initials: R
authors.lastname: Jones
authors.forename: Greg W
authors.initials: GW
authors.lastname: Baxter
authors.forename: Stephen F
authors.initials: SF
authors.lastname: Collins