I don't think fiber optics technology will have any need for a light-absorbing material. But the optical equipment that exist in space, such as the supersensitive infrared cameras need a material like vantablack to absorb any stray/unwanted light from getting to the camera.
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I was thinking more along the lines of not allowing the light to leak from the fiber optic cable, or have other stray higher intensity light wavelengths from interfering with its own light signal, no signal loss thing.
Ok, you mean to form a sort of magnetic shield around the fiberoptics cables to reduce polarisation of light as it propagates along the medium? I doubt it can do that.