Superluminal propagation at negative group velocity in optical fibers based on Brillouin lasing oscillation |
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Authors: | Zhang Liang Zhan Li Qian Kai Liu Jinmei Shen Qishun Hu Xiao Luo Shouyu |
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Institution: | Department of Physics, Key Laboratory for Laser Plasmas (Ministry of Education), Shanghai Jiao Tong University, Shanghai, 200240, China. |
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Abstract: | We report superluminal propagation in optical fibers using Brillouin lasing oscillation in a ring cavity. Negative group velocity propagation through a 10-m single mode fiber has been experimentally demonstrated. An advancement of 221.2 ns was observed before the input signal, which was achieved with a very high slope efficiency of 211.3 ns/dB. This indicates that this way is suitable for long-distance low-loss superluminal propagation via optical fibers. Correspondingly, the group velocity is -0.151c and the group index is -6.636-the highest group velocity ever reported for optical fibers. |
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