.Novel simulation method for fiber Bragg grating under inhomogeneous strain fields[J].Optoelectronics Letters,2005,1(3):238-240 |
Novel simulation method for fiber Bragg grating under inhomogeneous strain fields |
YUN Bin-feng LU Chang-gui WANG Zhu-yuan WANG Yi-ping CUI Yi-ping |
Advanced Photonics Center, Southeast University, Nanjing 210096, China |
Abstract: |
The spectra of fiber Bragg grating (FBG) in inhomogeneous strain fields are distorted due to its inhomogeneity of both the
periods and the effective refractive index. The couple mode theory and the Runge-Kutta method can be employed for exact simulation
of the spectrum of Bragg grating in such field, but the convergence speed is slow. On the other hand, although the transfer
matrix method could be used with higher convergence speed, the precision is poor because of the neglect of the grads of strain
change. By improving the FBG equivalent period, a novel simulation method based on a modified transfer matrix method is proposed,
which has the advantage of quick-convergence as well as good accuracy.
This work is supported by Jiangsu Province Natural Science Foundation of China under project BK2004207 and the National Science
Fund for Distinguished Young Scholars under project 60125513. |
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