[1] [1] A. MacLean, C. Moran, W. Johnstone, B. Culshaw, D. Marsh, and P. Parker, Sensors and Actuators A 109, 60 (2003).

[2] [2] A. Carrillo, E. Gonzalez, A. Rosas, and A. Marquez, Sensors and Actuators A 99, 229 (2002).

[3] [3] A. Sun, X. Qiao, Z. Jia, T. Guo, and C. Chen, Chin. J. Lasers (in Chinese) 32, 224 (2005).

[4] [4] R. M. Lopez, V. V. Spirin, M. G. Shlyagin, S. V. Miridonov, G. Beltran, E. A. Kuzin, and A. Marquez Lucero, Opt. Fiber Technol. 10, 79 (2004).

[5] [5] V. V. Spirin, M. G. Shlyagin, S. V. Miridonov, F. J. M. Jimenez, and R. M. L. Gutierrez, Optics and Lasers in Engineering 32, 497 (2000).

[6] [6] Z. D. Jiang, Y. N. Wang, and Y. L. Zhao, A smart optical fiber sensing cable for monitoring the health of long-distance oil pipeline (in Chinese) China Patent 200410073072.5 (2004).

[7] [7] Z. D. Jiang, Y. N. Wang, Y. L. Zhao, and G. D. Ren, An intelligent method of real-time detecting oil pipeline leakage based on distributed optical fiber sensor (in Chinese) China Patent 02145502.3 (2002).

[8] [8] M. D. Jones, IEEE Photon. Technol. Lett. 5, 822 (1993).

[9] [9] Y. Wang, Y. Zhao, Z. Jiang, L. Zhu, J. Yang, and G. Zhao, J. Xi'an Jiaotong University (in Chinese) 37, 933 (2003).

[10] [10] M. J. E. Golay, IEEE Trans. Information Theory 7, 82 (1961).

[11] [11] M. Nazarathy, S. A. Newton, R. P. Giffard, D. S. Moberly, F. Sischka, W. R. Trutna, and S. Foster, J. Lightwave Technol. 7, 24 (1989).

[12] [12] M. Nazarathy, S. A. Newton, and W. R. Trutna, Electron. Lett. 26, 70 (1990).