Ultraviolet light photosensitivity in Ge-doped silica fibers: wavelength dependence of the light-induced index change.


  • Malo, B.
  • Vineberg, K.A.
  • Bilodeau, Francois
  • Albert, Jacques
  • Johnson, D.C.
  • Hill, K.O.




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 × 10−5 over the measured wavelength range of 700 to 1400 nm.


OSA Publishing

Peer Review: 

Published in Peer Reviewed Journal

Faculty Name: 

Faculty of Engineering and Design

Department Name: 

Department of Electronics

Items in CURVE are protected by copyright, with all rights reserved, unless otherwise indicated. They are made available with permission from the author(s).