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Cold plasma of power 13W has been applied on step index plastic opticalfibers. It is used to study the ability for any variations in the opticalparameters that are effective in communication. The effect of plasma on theoptical parameters, such as core index profile, cladding index and thenumerical aperture, has been studied by multiple beam interference fringes. Theinterference fringes have been processed using a homemade Matlab writtenprogram to get more accurate measurements. It is found that there is anincrease of 1.5839 in core index, at core-clad interface, with a plasmaexposure time of 150 sec.

Effect of Cold Hydrogen Plasma on Optical Parameters of an Optical Fiber