[1] [1] R. H. Stolen, Parametric amplification and frequency conversion in optical fibers. IEEE J. Quant. Electron., 1982, QE-18(7):1062～1072

[2] [2] Kyo Inoue, Four-wave mixing in an optical fiber in the zero-dispersion wavelength region. IEEE, J. Lightwave Technol., 1992, 10(11):1553～1560

[3] [3] R. W. Tkach, A. R. Chraplyvy, F. Forghieri, et al., Four-photon mixing and high-speed WDM systems. IEEE, J. Lightwave Technol., 1995, 13(5):841～849

[4] [4] Hidenori Taga, Long distance transmission experiments using the WDM technology. IEEE J. Lightwave Technol., 1996, 14(6):1287～1298

[5] [5] F. Forghieri, R. W. Tkach, A. R. Chraplyvy, Reduction of four-wave mixing crosstalk in WDM systems using unequally spaced channels. IEEE Photon. Technol. Lett., 1994, 6(5):754～756

[6] [6] Eric Saint Georges, Experimental study of four-wave mixing on dispersion shifted fiber and low dispersion fibers with a dense multiwavelength source. OFC′97, Washington, D. C.: Opt. Soc. of Am., 1997, 2:67～49