Abstract

The launching efficiencies of the HE1m modes and the over-all launching efficiency are calculated for the cases in which a self-focusing optical fiber is excited axially by a TEM0n beam mode or by a beam consisting of several beam modes. It is shown that, when the fiber is excited by a TEM00 mode whose spot size s is very large compared with the characteristic spot size so of the fiber, the HE1m modes are almost equally excited and that, if s is matched to so, the over-all launching efficiency is nearly 100%. The over-all launching efficiency as well as the launching efficiencies of the HE1m modes decrease considerably when the fiber is excited by a beam containing the TEM01 mode that is out of phase with the TEM00 mode. The effect of the off-axis excitation by a TEM00 mode on the over-all launching efficiency is also examined.

© 1975 Optical Society of America

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