DETERMINATION OF MODE POWER DISTRIBUTION IN A PARABOLIC-INDEX OPTICAL FIBERS - THEORY AND APPLICATION

A novel measurement method for determining mode power distribution in a multimode parabolic-index fiber is developed. Using this method, the mode power distributions are obtained in terms of the principal mode number by. numerically processing the measured Fraun-hofer diffraction patterns of the near-field patterns on an output fiber endface. As an example, differential mode attenuation of a multimode parabolic-index fiber is measured. It is confirmed experimentally that the method is practically applicable to the mode power distribution measurements in a parabolic-index fiber. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.