Fused fiber optic devices are bundles of glass optical fibers that have been successively bundled and drawn to smaller
and smaller sizes, effectively creating a “zero optical path window”. Due to the nature of fiber’s clad and core design,
pixelization or sampling of the resulting image occurs; this sampling fundamentally degrades the image. Degradation of
a resulting image caused by an optical system can be quantified by way of its Modulation Transfer Function. However,
since fused fiber optic devices first sample then effectively project the original image, they do not meet the Fourier
transform’s prerequisite conditions of being linear and isoplanatic.
Current technologies at SCHOTT Lighting and Imaging have initiated a study to determine methodology for measuring
the sampled modulation transfer function of bonded assemblies such as bonded Faceplate-to-OLED and Faceplate-tosensor
assemblies. The use of randomly generated targets imaged through the bonded assemblies proved to be a useful
tactic. This paper discusses the test methods developed and subsequent measurement of the sampled modulation transfer
function of fused fiber optic bundles and bonded assemblies.
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