Abstract
A modified form of optical fibers with varying cross section is proposed. A Bragg optical fiber with an additional conic layer between the core and periodic cladding is considered. Oscillating scattering of light through the side surface of such a fiber is predicted. It is shown that the optical properties of spicules of marine glass sponges Hyalonema sieboldi can be explained by the conic shape of the near-axis layer.
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