title: Ultraviolet light photosensitivity in Ge-doped silica fibers: wavelength dependence of the light-induced index change.
abstract: A novel technique is reported for detecting permanent and transient light-induced refractive-index changes (photosensitivity) in optical fibers. The index change is detected by irradiating one arm of an unbalanced Mach-Zehnder fiber interferometer with UV light, thereby changing its optical path length. From a measurement of the change in the spectral response of the Mach-Zehnder interferometer, the change in the fiber core index as a function of wavelength can be determined. The equilibrium change in the core index is found to have an almost constant value of approximately 2.3 x 10(-5) over the measured wavelength range of 700 to 1400 nm.
authors.forename: B
authors.initials: B
authors.lastname: Malo
authors.forename: K A
authors.initials: KA
authors.lastname: Vineberg
authors.forename: F
authors.initials: F
authors.lastname: Bilodeau
authors.forename: J
authors.initials: J
authors.lastname: Albert
authors.forename: D C
authors.initials: DC
authors.lastname: Johnson
authors.forename: K O
authors.initials: KO
authors.lastname: Hill