Kitcher Daniel J, Nand Anbhawa, Wade Scott A, Jones Rhys, Baxter Greg W, Collins Stephen F
Optical Technology Research Laboratory, Centre for Telecommunications and Microelectronics, Victoria University, Melbourne VIC 8001, Australia.
J Opt Soc Am A Opt Image Sci Vis. 2006 Nov;23(11):2906-11. doi: 10.1364/josaa.23.002906.
The reflectance spectra of chirped fiber Bragg gratings can depend substantially on the direction from which the measurement is taken. The measured difference between forward and backward reflectance spectra measured in a linearly chirped grating was shown to be due to the measured excess loss. Simulation using the popular transfer-matrix model demonstrated that the observed asymmetric behavior could be obtained only when excess loss has an asymmetric spectral shape about the local Bragg wavelengths. Application of cladding mode excess losses to the result of a transfer-matrix model accounted for the experimental observation.
啁啾光纤布拉格光栅的反射光谱在很大程度上可能取决于测量的方向。在一个线性啁啾光栅中测量的正向和反向反射光谱之间的差异被证明是由于测量到的额外损耗。使用流行的传输矩阵模型进行的模拟表明，只有当额外损耗在局部布拉格波长附近具有不对称的光谱形状时，才能获得观察到的不对称行为。将包层模额外损耗应用于传输矩阵模型的结果解释了实验观察结果。
