Abstract
We investigated the fiber fuse propagation speed in different kinds of few-mode fibers (FMFs) by combining heterodyne detection and time-frequency analysis. The periodic speed oscillation due to mode interference was observed, and we confirm that the characteristic length (defined as the optical discharge propagation distance within a period of speed oscillation) is independent of the launched power, which is different from that observed in single-mode fibers. Moreover, we believe that the optical field modulation with enough intensity led to the variation of the optical discharge center position. about half of the beat length in the two-mode fiber was observed accordingly. In addition, we show that pure-silica core FMFs with large effective area are desired for fiber fuse suppression in mode-division multiplexing transmission.
© 2018 Optical Society of America
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