Enhancement of the wavelength selectivity of a volume hologram by use of multimode optical fiber referencing. 
Wavelength multiplexing of a volume hologram was combined with multimode fiber referencing.  A photorefractive volume hologram was recorded and probed by reference light diffracted from a multimode optical fiber.  A tunable laser diode was used as a light source that was launched into the multimode fiber.  As the wavelength of the source laser shifted, the speckle patterns from the multimode fiber changed.  The wavelength selectivity of the volume hologram was enhanced by the combined effect of wavelength change and speckle change.