Remote multiplexing of holograms with random patterns from multimode fiber bundle

摘要

We propose remote-multiplexing methods of holograms. A multimode fiber bundle is used as a reference beam-guiding device. Coherent optical wave coupled into the fiber bundle propagates through the bundle and free-space at the output facet. The generated far-field pattern is a kind of random pattern and is used as a reference beam for hologram multiplexing. We model the random pattern by superposition and concatenation of the propagation modes of the multimode fiber and free-space. Based on this model, we analyze and optimize remote multiplexing methods of angle multiplexing, shift multiplexing, and wavelength multiplexing cases. The optimization comes from controlling the number of waveguiding multimode fibers and the transversal spatial spectral range of the fiber-coupled optical wave. The experimental results show the validity of our model. This method and model can be applied to general multimode wave-guide array for random pattern referencing and provide integrated optical system for holographic data storage system.