Zhu Tao, Bao Xiaoyi, Chen Liang, Liang Hao, Dong Yongkang
Fiber Optics Group, Department of Physics, University of Ottawa, Ontario K1N 6N5, Canada.
Opt Express. 2010 Oct 25;18(22):22958-63. doi: 10.1364/OE.18.022958.
The linewidth, the threshold, and frequency shift of the stimulated Rayleigh scattering (STRS) in single mode fiber (SMF-28e), large effective area fiber (LEAF) and polarization maintaining fiber (PMF) have been studied using heterodyne detection to separate the Brillouin scattering with a fiber laser for the first time to the best of our knowledge. Experimental results show that the linewidth of STRS and spontaneous Rayleigh scattering are ~9 kHz, ~10 kHz, and ~11 kHz, and ~25 kHz, ~30 kHz, and ~27 kHz for SMF-28e, LEAF and PMF, respectively. The threshold power for STRS for 2 km SMF-28e, 7 km LEAF, and 100 m PMF are 11 dBm, 4.5 dBm and 16.5 dBm, respectively. The measured Rayleigh gain coefficient is a 2 × 10(-13) m/W for SMF-28e. Also, weak frequency shift could be observed when input power is large enough before SBS occurred. Because of the properties of narrower bandwidth and lower threshold power of STRS in fibers, some of applications, such as narrower filter, could be realized.
据我们所知，首次使用外差检测结合光纤激光器分离布里渊散射，对单模光纤（SMF - 28e）、大有效面积光纤（LEAF）和保偏光纤（PMF）中的受激瑞利散射（STRS）的线宽、阈值和频移进行了研究。实验结果表明，对于SMF - 28e、LEAF和PMF，STRS的线宽和自发瑞利散射的线宽分别约为9 kHz、10 kHz和11 kHz，以及约25 kHz、30 kHz和27 kHz。2 km SMF - 28e、7 km LEAF和100 m PMF的STRS阈值功率分别为11 dBm、4.5 dBm和16.5 dBm。测得的SMF - 28e的瑞利增益系数为2×10⁻¹³ m/W。此外，在受激布里渊散射（SBS）发生之前，当输入功率足够大时，可以观察到微弱的频移。由于光纤中STRS具有带宽更窄和阈值功率更低的特性，一些应用，如更窄的滤波器，得以实现。
