  We investigate light propagation in randomly spaced fiber gratings in a
single mode fiber, and demonstrate the localization effect. Localization of
light in random media resembles that of electrons in disordered solids,
resulting from a subtle wave interference formation. We measured the light
transmission after each additional grating fabrication and found an exponential
decay that follows the localization theory. An important feature of the random
array is its similarity to ordered gratings in the transmission and reflection
behavior at the long array regime. Besides the basic interest in localization
in one-dimensional systems, random grating arrays have potential applications,
utilizing the possibility to fabricate long structures with strong and
broadband reflections.
