We propose a new method for one-way multipixel image transmission through a multimode optical fiber (MOF). The method is based on the two-pass method, in which a light field bearing an image makes a round trip through a MOF. One-way multipixel image transmission can be realized even through a long and/or winding MOF in which the fiber modes are strongly scrambled with a tandem arrangement of two photorefractive crystals to generate a precise phase-conjugated wave. In this study, images of two pixels (2-bit data) are transmitted through a 100-m MOF more than 20 times for one recording of holograms onto a photorefractive crystal. We also show that a reference beam with a distorted wave front can be utilized, which is transmitted by another MOF instead of a single-mode optical fiber.
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