Abstract: The multimode fiber is one of the important components in optical imaging and multichannel sensing systems. The critical issue in the design of such systems is the level of the crosstalk ratio (light leakage between adjacent fibers or interchannels). The system performance degrades whenever crosstalk leads to a transfer of power from one fiber to another (or one channel from another). This paper develops a unique approach to derive and compute the crosstalk ratio, effective coupling coefficient and field distribution of flexible multimode fibers. Our results also demonstrate that Gaussian approximation can be used to compute the crosstalk ratio successfully. Furthermore, by taking advantage of the Gaussian approximation, we can obtain quantitative correlation between the crosstalk ratio and fiber parameters in order to reduce crosstalk. This may lead to improved contrast and sensitivity of fiber imaging and multichannel sensing systems. !10
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