Abstract

We observe fiber fuse propagation in the LP₁₁ mode in few-mode fiber by selective propagation mode launching via a PLC-based mode multiplexer. We focus on two fiber fuse propagation parameters, namely, the propagation power threshold ${\rm P_{th}}$ , and the diameter of the melted area ${\rm D_{melted}}$ . We confirm experimentally that ${\rm P_{th}}$ in the LP₁₁ mode was higher than that in the LP₀₁ mode. ${\rm P_{th}}$ of the LP₀₁ and LP₁₁ modes increases linearly with the Gaussian beam width, which is similar to the dependence of the mode field diameter of ${\rm P_{th}}$ in the LP₀₁ mode. We also find a specific relationship between the power density and ${\rm D_{melted}}$ normalized by the Gaussian beam width regardless of input mode conditions and fiber type. Therefore, we believe that we can utilize the Gaussian beam width of the near field pattern of the LP₀₁ and LP₁₁ modes for predicting the characteristics of fiber fuse propagation in both modes.

© 2016 IEEE

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