Abstract

The temperature distribution in a step-index multimode optical fiber is calculated when light is launched into the core either as a cw or as a pulse train. It is shown that, after constant energy begins to flow in the core by a cw, the steady-state temperature depends strongly on the environment in which the fiber is placed. The energy transmission capacity of an optical fiber is defined as the input power which raises the temperature of the fiber to an acceptable level. When a plastic-coated fiber of 1-mm diam is placed in the air with free convection, the calculated capacity for a continuous input wave is ~820 W if the loss of the fiber is 10 dB/km.

© 1981 Optical Society of America

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