  Imaging through a single optical fiber offers attractive possibilities in
many applications such as microendoscopy or remote sensing. However, the direct
transmission of an image through an optical fiber is difficult because spatial
information is scrambled upon propagation. We demonstrate an image transmission
strategy where spatial information is first converted to spectral information.
Our strategy is based on a principle of spread-spectrum encoding, borrowed from
wireless communications, wherein object pixels are converted into distinct
spectral codes that span the full bandwidth of the object spectrum. Image
recovery is performed by numerical inversion of the detected spectrum at the
fiber output. We provide a simple demonstration of spread-spectrum encoding
using Fabry-Perot etalons. Our technique enables the 2D imaging of
self-luminous (i.e. incoherent) objects with high throughput in principle
independent of pixel number. Moreover, it is insensitive to fiber bending,
contains no moving parts, and opens the possibility of extreme miniaturization.
