[1] [1] Hu L L,Liu Z J. Acta Photonica Sinica,2003,32(6):727～730

[2] [2] Miyamoto Y,Hirano A,Yonenaga K,et al. 320 Gbps(8×40Gbps) WDM transmission over 367km repeater spacing using carrier-suppressed return-to-zero format.Electron Lett,1999,35(23): 2041～2042

[3] [3] Hodzic A,Konrad B,Petermann K. Alternative modulation formats in N×40Gb/s WDM standard fiber RZ-transmission systems. J Lightwave Technol,2002,20(4): 598～607

[4] [4] Hu L L,Liu Z J,Yang G Q. Acta Photonica Sinica,2003,32(10): 1181～1184

[5] [5] Bergano N S,Nissov M,Pilipetskii A,et al. Chirped Return-to-Zero Formats for Ultra Long-Haul Fiber Communications. IEEE/LEOS Workshop on Advanced Modulation Formats,San Francisco,CA,2004,pp. 1～2

[6] [6] Bosco G,Carena A,Curri V,et al. Modulation formats suitable for ultrahigh spectral efficient WDM systems.IEEE J Quantum Electronics,2004,10(2): 321～328

[7] [7] Sieben M,Conradi J,Dodds D E. Optical single sideband transmission at 10Gb/s using only electrical dispersion compensation. J Lightwave Technol,1999,17(10):1742～1749

[8] [8] Hu L L,Liu Z J,Yang G Q. Acta Photonica Sinica,2004,33(2): 179～182

[9] [9] Walklin S,Conradi J. Effect of mach-zehnder modulator DC extinction ratio on residual chirp-induced dispersion in 10-Gb/s binary and AM-PSK duobinary lightwave systems. IEEE Photon Technol Lett,1997,9(10): 1400～1402

[10] [10] Ziemer R E,Tranter W H,translated by Yuan D F,Jiang M Y. Principles of Communications. Beijing:Higher Education Press,2004: 78～81,121～122