Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 28

A silica tube with inside and outside radii of 3 and 4 mm, respectively, is to have a certain thickness of glass deposited on the inner surface. What should the thickness of this glass deposition be if a fiber having a core diameterof 50 µ m and an outer cladding diameter of 125 µ m is to be drawn from this preform using the MCVD fabrication process.