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an optical fiber consists of three concentric elements, the core, the cladding and the outer coating, often called the buffer.
http://labman.phys.utk.edu/phys222core/modules/m7/optical-fibers.html#:~:text=An%20optical%20fiber%20consists%20of,The%20cladding%20surrounds%20the%20core.
https://en.wikipedia.org/wiki/Cladding_(fiber_optics)
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