[1] Liu G J,Liang B M,Jin G L,et al. Switching characteristics of variable coupling coefficient nonlinear directional coupler. J Lightwave Technol,2004,22(6):1591～1597.

[2] Li J S,Bao Z W. The neural network model of optical fiber direction coupler. IEEE Int Conf Neural Networks Singal Processing,Nanjing,China,2003,December 14～17

[3] Hudgings J,Molter L,Dutta M. Design and modeling of passive optical switches and power dividers using non-planar coupled fiber arrays. IEEE J Quantum Electron,2000,36(12): 1438～1444

[4] Molter-Orr L A,Haus H A. N×N coupled waveguide switch. Opt Lett,1984,9(10): 466～467

[5] Snyder A W. Coupled-mode theory for optical fibers. J Opt Soc Am,1972,62(11): 1267～1277

[6] McIntyre P D,Snyder A W. Power transfer betweer optical fibers. J Opt Soc Am,1973,63(12): 1518～1527

[7] Chang H C,Huang H S,Wu J S. Wave coupling between parallel single-mode and multimode optica fibers. IEEE Trans Microwave Theory Tech,1986,34(12): 1337～1343

[8] Xue C R,Zhu S X,Xiao Z G. Acta Photonica Sinica,2004,33(7): 803～805