Zou Lufan, Bao Xiaoyi, Chen Liang
Fiber Optics Group, Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada.
Opt Lett. 2003 Nov 1;28(21):2022-4. doi: 10.1364/ol.28.002022.
The Brillouin scattering spectrum in a photonic crystal fiber (PCF) with a partially Ge-doped core is measured with a pump-probe technique at a wavelength of 1320 nm. One main peak and four subpeaks are observed. The main peak has a Lorentzian shape with the bandwidth deltanuB = 66 MHz. Its intensity is six times higher than that from a standard single-mode fiber measured under the same conditions, which is consistent with the ratio of (1/Aeff(PCF))/(1/Aeff(SMF)), where Aeff is the effective area of the fibers. The temperature coefficient for the main peak is 0.96 MHz/degrees C. We believe that the subpeaks are caused by an interaction between light-wave and guided modes of longitudinal acoustic waves in the graded-Ge-doped region, the silica region, and the microstructured cladding. An analysis of the guiding and antiguiding properties of the PCF for acoustic waves is presented.
采用泵浦-探测技术在1320nm波长下测量了具有部分掺锗纤芯的光子晶体光纤（PCF）中的布里渊散射光谱。观察到一个主峰和四个子峰。主峰呈洛伦兹形状，带宽ΔνB = 66MHz。其强度比在相同条件下测量的标准单模光纤的强度高六倍，这与(1/Aeff(PCF))/(1/Aeff(SMF))的比值一致，其中Aeff是光纤的有效面积。主峰的温度系数为0.96MHz/℃。我们认为子峰是由光波与渐变掺锗区域、二氧化硅区域和微结构包层中的纵向声波导模之间的相互作用引起的。本文对PCF对声波的导波和反导波特性进行了分析。
