Opt Lett. 2018 Sep 1;43(17):4252-4255. doi: 10.1364/OL.43.004252.
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 L (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. L 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.
我们通过结合外差探测和时频分析研究了不同种类的少模光纤（FMF）中的光纤熔丝传播速度。观察到了由于模式干涉引起的周期性速度振荡，并确认特征长度 L（定义为速度振荡周期内的光放电传播距离）与发射功率无关，这与在单模光纤中观察到的情况不同。此外，我们认为足够强度的光场调制导致了光放电中心位置的变化。因此，在双模光纤中观察到 L 约为拍长的一半。此外，我们表明，在模式分复用传输中，为了抑制光纤熔丝，需要具有大有效面积的纯二氧化硅芯少模光纤。
