Abstract

A relation between the modal power distribution and the radiance at the fiber end face is derived. From this relation near-field and far-field intensities are expressed in terms of the modal power distribution. The relation for the far-field intensity is discussed in detail for some special cases.

© 1981 Optical Society of America

Determination of modal power distribution in graded-index optical waveguides from near-field patterns and its application to differential mode attenuation measurement

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