Abstract
In this paper, we propose a honeycomb pure-silica-core fiber array associated with air hole cladding to realize both low inter-core coupling and high core density for high-resolution image transmission. The proposed fiber array structure easily achieves a high core-cladding contrast due to the high refractive index difference between silica and air, thus strengthening the light-confining ability of the cores. Numerical simulations demonstrate that, by optimizing the air-hole diameter and the lattice constant, a core spacing of 4.33µm and a power coupling ratio of lower than 1% between the adjacent cores can be obtained. We can further deduce that the optimum fiber array with 500µm diameter can achieve about 10,000 image pixels. Moreover, because of the uniform pure-silica-core structure, this fiber array would be easier to fabricate compared to other fiber bundles with either different sizes of cores or multiple kinds of doped-silica cores.
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