Mode coupling coefficient measurements in optical fibers

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Abstract
The measuring method of the mode coupling coefficient was developed to apply to multimode fibers. It is shown that a mode coupling coefficient can be calculated from each mode group pulse waveform. Measurements were made with two cases of long-length and short-length multimode step-index fibers. As a result, it was observed that in the fiber sheathed by nylon, there existed a strong mode coupling in lower order modes. When it is assumed that this mode coupling is generated by microbendings, the correlation length and standard deviation of the curvature were estimated as 2.0 mm and 4.2 × 10−4 mm−1, respectively.