[4] Jianzhong Gao, Zhuangde Jiang, Yulong Zhao et al.. Full distributed fiber optical sensor for intrusion detection in application to buried pipelines[J]. Chin. Opt. Lett., 2005, 3(11): 633～635

[5] P. Pepeljugoski, S. E. Golowich, A. J. Ritger et al.. Modeling and simulation of nextgeneration multimode fiber links[J]. J. Lightwave Technol., 2003, 21(5): 1242～1255

[6] S. E. Golowich, W. A. Reed, A. J. Ritger. A new modal power distribution measurement for highspeed shortreach optical systems[J]. J. Lightwave Technol., 2004, 22(2): 457～468

[7] S. Ramachandran, B. Mikkelsen, L. C. Cowsar et al.. Allfiber gratingbased higher order mode dispersion compensator for broadband compensation and 1000km transmission at 40 Gb/s[J]. IEEE Photon. Technol. Lett., 2001, 13(6): 632～634

[8] A. Kumar, N. K. Goel, R. K. Varshney. Studies on a fewmode fiber|optic strain sensor based on LP01LP02 mode interference[J]. J. Lightwave Technol., 2001, 19(3): 358～362

[9] D. Rittich. Practicability of determining the modal power distribution by measured near and far fields[J]. J. Lightwave Technol., 1985, LT3(3): 652～661

[10] C. Yang, Y. Wang, C. Q. Xu. A novel method to measure modal power distribution in multimode fibers using tilted fiber Bragg gratings[J]. IEEE Photon. Technol. Lett., 2005, 17(10): 2146～2148

[11] R. Kashyap. Fiber Bragg Gratings[M]. San Diego: Academic Press, 1999. 158～165

[12] Y. Li, M. Froggatt, T. Erdogan. Volume current method for analysis of tilted fiber gratings[J]. J. Lightwave Technol., 2001, 19(10): 1580～1591

[15] D. Kokou, L. Sophie, F. Marie. Numerical analysis of the contribution of the transverse asymmetry in the photoinduced index change profile to the birefringence of optical fiber[J]. J. Lightwave Technol., 2002, 20(8): 1463～1470