Abstract

Using the power flow equation, the state of mode coupling in $100–400\mathrm{\mu m}$ core step-index silica optical fibers is investigated in this article. Results show the coupling length $L_c$ at which the equilibrium mode distribution is achieved and the length $z_s$ of the fiber required for achieving the steady-state mode distribution. Functional dependences of these lengths on the core radius and wavelength are also given. Results agree well with those obtained using a long-established calculation method. Since large core silica optical fibers are used at short distances (usually at lengths of up to $10\mathrm{m}$), the light they transmit is at the stage of coupling that is far from the equilibrium and steady-state mode distributions.

© 2011 Optical Society of America

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