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Abstract
In this paper, an analytical model of the fusion splicing loss of few-mode fiber (FMF) under the condition of dynamic crosstalk is proposed. Under different dynamic spatial modal crosstalk caused by fusion mismatches and rotation angles, we analyze the variation trend of the fusion splicing loss characteristics of FMF with ${{\rm LP}_{01}},\;{{\rm LP}_{11a}}$, and ${{\rm LP}_{11b}}$, respectively. Simulation results show that under the condition of axial misalignment introducing modal crosstalk, the splice loss of the ${{\rm LP}_{11a}}$ and ${{\rm LP}_{11b}}$ modes is higher than that of ${{\rm LP}_{01}}$. On the other hand, the modal crosstalk caused by rotation angles makes the fusion splice loss of ${{\rm LP}_{01}}$ present symmetrical distribution, and the loss of fusion splice of ${{\rm LP}_{01}}$ is maximum at 45°. When rotating from 0° to 90°, for ${{\rm LP}_{11a}}$ and ${{\rm LP}_{11b}}$ modes, the fusion loss of ${{\rm LP}_{11a}}$ decreases gradually, while the loss of ${{\rm LP}_{11b}}$ increases gradually. Both are in a symmetrical distribution. Meanwhile, we build an FMF fusion splice loss measurement system based on photon lanterns and FMF circulators. The experimental results show that it is consistent with the simulation results, and the experimental and simulation results confirm the feasibility of the fusion splice fault loss analysis modal under dynamic crosstalk conditions.
© 2021 Optical Society of America
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