Abstract

A simplified method for the measurement of mode conversion coefficients and mode dependent losses is proposed. The method utilizes sinusoidally modulated light instead of optical pulses and is applied to step-index multimode fibers. The results obtained by frequency domain measurement agree satisfactorily with those obtained by time domain measurement. It is confirmed that frequency domain measurements make it simple to obtain mode conversion coefficients and mode dependent losses. Experiments also show that mode dependent losses in the fibers are roughly independent of the mode order, and that the dynamic equilibrium is attained after propagation over a few kilometers even in available step-index fibers.

© 1981 Optical Society of America

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