Long-distance waveguide image transmission in coherent light

A cylindrical waveguide with a square-law medium is used to demonstrate theoretically the possibility of optical image transmission along multimode waveguides over long distances (from hundreds of meters to a few kilometers). Expressions are derived to determine the position of the distant cross sections where the image is formed, and the number of image elements which can be transmitted to these cross sections. Requirements on the radiation source are formulated allowing for the chromatic aberrations in the waveguide.